Ankle Brachial Index Quiz

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Questions and Answers

Which pressure measurement indicates a significant decrease in the leg compared to the proximal thigh?

  • Ankle: 112 mmHg (correct)
  • Distal thigh: 126 mmHg
  • Right arm: 142 mmHg
  • Calf: 116 mmHg (correct)

What condition can be indicated by the decrease in blood pressure in the entire leg?

  • Aortoiliac disease (correct)
  • Chronic venous insufficiency
  • Pulmonary embolism
  • Deep vein thrombosis

An ABI of 0.77 suggests which condition?

  • Severe arterial disease (correct)
  • Normal arterial function
  • Mild arterial disease
  • High blood pressure

Which characteristic does NOT belong to a normal arterial PPG waveform?

<p>Slow upslope (D)</p> Signup and view all the answers

What could indicate intrinsic compression of the iliac artery?

<p>Marked pressure drop from thigh to ankle (D)</p> Signup and view all the answers

The term 'catacrotic' in arterial waveforms typically refers to which aspect?

<p>Diminished dicrotic notch visibility (D)</p> Signup and view all the answers

Which of the following measurements would be considered abnormal in a PPG waveform?

<p>Little difference between systolic and diastolic volumes (A)</p> Signup and view all the answers

What is the significance of an Ankle Brachial Index (ABI) measurement below 0.5?

<p>Represents severe arterial disease. (D)</p> Signup and view all the answers

What does a Thigh/Brachial index greater than 1.2 indicate?

<p>Severe vascular blockage. (A)</p> Signup and view all the answers

Which of the following is a criterion for a normal exercise evaluation?

<p>Subjects can walk for 5 minutes or more without symptoms. (B)</p> Signup and view all the answers

What is a critical ankle pressure difference that indicates severe arterial disease?

<p>A difference of 30 mmHg or more. (A)</p> Signup and view all the answers

What happens to ankle pressures in a normal patient post-exercise?

<p>They decrease to normal levels rapidly within 5 minutes. (A)</p> Signup and view all the answers

What Ankle Brachial Index (ABI) value indicates single vessel disease?

<p>ABI &gt; 0.5 (D)</p> Signup and view all the answers

Which of the following ABI values suggests multiple vessel disease?

<p>ABI &lt; 0.5 (D)</p> Signup and view all the answers

What is the normal range for Ankle Brachial Index (ABI)?

<p>0.9 - 1.3 (C)</p> Signup and view all the answers

What condition is associated with ankle pressures less than 80 mmHg?

<p>Non-healing wounds (A)</p> Signup and view all the answers

What is the acceptable difference in pressure in the same segment in both legs?

<p>&lt; 20 mmHg (B)</p> Signup and view all the answers

What does an ABI value of 1.30 indicate?

<p>Medial calcification (C)</p> Signup and view all the answers

Which statement about peak systolic velocity (PSV) is correct?

<p>Less than a 2x increase between adjacent segments indicates normal function (B)</p> Signup and view all the answers

What is the criteria for exercise evaluation to determine an issue?

<p>5 minutes or more of walking without symptoms (D)</p> Signup and view all the answers

Which of the following ABI values is considered abnormal?

<p>0.7 (A)</p> Signup and view all the answers

What does an ABI value of 0.96 indicate in relation to peripheral arterial disease?

<p>Mild to moderate peripheral artery disease (D)</p> Signup and view all the answers

What is the significance of biphasic waveforms observed in the PTA and DPA?

<p>Suggest normal arterial blood flow (D)</p> Signup and view all the answers

Which vascular change is indicated by elevated velocities during exercise?

<p>Presence of significant stenosis (A)</p> Signup and view all the answers

Why might there be no change in waveforms or ankle pressures with exercise?

<p>Adequate collateral circulation (D)</p> Signup and view all the answers

In the four cuff method for obtaining segmental pressures, what is the expected difference between proximal thigh blood pressure and brachial systolic pressure?

<p>30-40 mmHg (C)</p> Signup and view all the answers

What might extensive collateral formation indicate regarding blood flow?

<p>Improved blood flow despite proximal obstruction (B)</p> Signup and view all the answers

What finding suggests the presence of adequate perfusion despite significant stenoses?

<p>Persistence of normal waveform patterns (B)</p> Signup and view all the answers

Which anatomical site is directly correlated with the assessment of stenosis using duplex ultrasound?

<p>Left femoral artery (C)</p> Signup and view all the answers

What physiological mechanism does peripheral vasodilation during exercise involve?

<p>Widening of blood vessels to enhance circulation (B)</p> Signup and view all the answers

What condition is most likely present based on the arm and ankle pressure measurements?

<p>Subclavian steal phenomenon (A)</p> Signup and view all the answers

What does a decrease in ankle pressures suggest in terms of peripheral arterial disease?

<p>Insufficient blood supply due to obstructive disease (A)</p> Signup and view all the answers

During reactive hyperemia testing, when are pressure measurements taken?

<p>Immediately after cuff release and every 30 seconds (A)</p> Signup and view all the answers

What is indicated by a 30 mmHg drop in pressure between the right upper arm and the radial artery?

<p>Radial artery disease (D)</p> Signup and view all the answers

What is a key characteristic of the recovery time during reactive hyperemia compared to treadmill testing?

<p>Recovery time is shorter during reactive hyperemia (A)</p> Signup and view all the answers

What discrepancy is noted between the left and right arm pressure measurements?

<p>Left arm pressure is significantly higher (B)</p> Signup and view all the answers

Which of the following is not a typical finding in patients undergoing upper extremity segmental pressure exams?

<p>Dust is applied to determine pressure changes (C)</p> Signup and view all the answers

What is the primary purpose of performing post-occlusive reactive hyperemia?

<p>To assess arterial blood flow (D)</p> Signup and view all the answers

In the given measurements, what does a higher ankle pressure compared to the arm pressure suggest?

<p>Normal vascular function in the legs (A)</p> Signup and view all the answers

Which statement is true concerning the relationship between arterial pressure and vascular disease?

<p>Lower pressures in one limb may indicate contralateral disease (D)</p> Signup and view all the answers

What does a normal arm pressure combined with a high ankle pressure indicate?

<p>Adequate arterial perfusion to the lower limb (D)</p> Signup and view all the answers

What is the primary purpose of reactive hyperemia testing?

<p>To stimulate exercise in patients unable to perform treadmill testing (B)</p> Signup and view all the answers

Which situation best illustrates reactive hyperemia?

<p>Transient increase in blood flow after removing a tourniquet (A)</p> Signup and view all the answers

When is reactive hyperemia testing particularly useful?

<p>For individuals with known arterial disease in one leg to evaluate symptoms in the other (A)</p> Signup and view all the answers

What triggers the initial phase of reactive hyperemia?

<p>Immediate cessation of blood flow to a localized area (D)</p> Signup and view all the answers

What physiological mechanism is primarily responsible for the increase in blood flow during reactive hyperemia?

<p>Vasodilation due to local metabolic byproducts (B)</p> Signup and view all the answers

What is the correct procedure when performing the Adson maneuver?

<p>The patient must take a deep breath and hold after abducting, extending, and laterally rotating the shoulder. (A)</p> Signup and view all the answers

What might indicate an abnormality in digit pressure assessment?

<p>Only one digit demonstrates reduced pressure while others are normal. (D)</p> Signup and view all the answers

What does a positive Adson maneuver indicate?

<p>A decrease in pulse vigor from the starting position to the final position. (B)</p> Signup and view all the answers

Which factor is most critical when interpreting a positive Adson maneuver?

<p>The measurement of the radial pulse on the affected side. (A)</p> Signup and view all the answers

What clinical finding should lead to further evaluation of the palmar arch?

<p>Abnormal additional digit pressure in one finger. (C)</p> Signup and view all the answers

What is the main purpose of the Adson maneuver?

<p>To diagnose thoracic outlet syndrome. (D)</p> Signup and view all the answers

Which cuff size is typically used for measuring wrist pressure?

<p>7 CM cuff. (C)</p> Signup and view all the answers

What is the main advantage of using a 3 cuff method for thigh pressure assessment?

<p>It provides a more accurate thigh pressure measurement. (C)</p> Signup and view all the answers

What is a common issue when utilizing smaller cuffs in the 4 cuff method for thigh assessment?

<p>They may overestimate the thigh pressure. (B)</p> Signup and view all the answers

Which cuff size is typically employed for assessing digit pressure?

<p>2.5 cm cuff (D)</p> Signup and view all the answers

Which statement accurately describes the purpose of segmental pressure assessment?

<p>It compares pressures in various segments of the limb. (A)</p> Signup and view all the answers

Which factor is NOT an appropriate reason to terminate a treadmill exercise for a lower extremity arterial exam?

<p>Patient complains that the treadmill is too noisy. (C)</p> Signup and view all the answers

What is an inherent limitation of utilizing the smaller cuffs in measuring thigh pressure?

<p>Potential for inaccurate and exaggerated readings. (A)</p> Signup and view all the answers

What should be prioritized when performing a segmental pressure exam?

<p>Employing a method that offers the most consistent readings. (C)</p> Signup and view all the answers

What is a primary characteristic of a digit pressure measurement using the 2.5 cm cuff?

<p>Provides precise readings of regional blood flow. (A)</p> Signup and view all the answers

In the context of performing a lower extremity arterial exam, what is most critical when evaluating cuff selection?

<p>Choosing cuffs designed for the specific segment being assessed. (A)</p> Signup and view all the answers

What condition is characterized by leg pain due to inadequate blood flow but will show a drop in ankle pressure with exercise?

<p>Claudication (D)</p> Signup and view all the answers

Which of the following conditions is NOT associated with a normal response in the Ankle Brachial Index (ABI)?

<p>Ischemic rest pain (A)</p> Signup and view all the answers

What describes the expected ABI response during an exercise-induced assessment in pseudoclaudication?

<p>No change in ABI. (A)</p> Signup and view all the answers

How does the ankle pressure behave in claudication during exercise?

<p>Decreases leading to pain. (C)</p> Signup and view all the answers

Based on the provided segmental pressures, what could potentially account for the differences noted in the ankle and thigh pressures?

<p>External compression from a pelvic mass. (B)</p> Signup and view all the answers

What is a fundamental difference between claudication and pseudoclaudication?

<p>Claudication shows decreased ankle pressure with exercise, while pseudoclaudication does not. (A)</p> Signup and view all the answers

Which of the following best describes pseudoclaudication symptoms during physical activity?

<p>Pain alleviated by sitting or standing still. (B)</p> Signup and view all the answers

Which statement accurately reflects the Ankle-Brachial Index (ABI) in the context of pseudoclaudication?

<p>ABI remains consistent and can indicate non-vascular causes. (D)</p> Signup and view all the answers

What might be indicated if there is no drop in ankle pressure during an exercise evaluation?

<p>Pseudoclaudication or an orthopedic issue may be present. (C)</p> Signup and view all the answers

What does a decreased pressure in the leg imply about potential vascular issues?

<p>It suggests aortoiliac disease or compression of the iliac artery. (C)</p> Signup and view all the answers

Which pressure reading is most notably lower when moving from the proximal thigh to the calf?

<p>116 mmHg in the calf (B)</p> Signup and view all the answers

How is the characteristic dicrotic notch of a normal arterial PPG waveform described?

<p>It is prominent and clearly defined. (A)</p> Signup and view all the answers

What might a notably slow upslope in a PPG waveform indicate?

<p>Potential peripheral arterial disease. (C)</p> Signup and view all the answers

What does an Ankle Brachial Index (ABI) of 0.77 typically signify?

<p>Mild to moderate arterial disease (D)</p> Signup and view all the answers

In evaluating arterial waveforms, what does the term 'anacrotic' describe?

<p>The initial upstroke of the waveform after systole. (C)</p> Signup and view all the answers

How does a 30 mmHg pressure drop between the right upper arm and the radial artery typically present?

<p>Suggests potential vascular obstruction. (D)</p> Signup and view all the answers

What does the term 'catacrotic' in the context of arterial waveforms refer to?

<p>The descending part of the waveform after the peak. (B)</p> Signup and view all the answers

Which statement regarding normal arterial PPG waveforms is accurate?

<p>They are characterized by a rapid upslope followed by a pronounced dicrotic notch. (D)</p> Signup and view all the answers

What is the minimum toe pressure considered normal if the systolic brachial pressure is 116 mmHg?

<p>70 mmHg (D)</p> Signup and view all the answers

Which factor is least likely to contribute to a false reduction in ankle pressure during assessment?

<p>Patient's body position (C)</p> Signup and view all the answers

In the context of measuring arterial pressures, what is likely to happen if a cuff is too large?

<p>False elevation of the ankle pressure (B)</p> Signup and view all the answers

What could extensive collateral formation suggest in a patient undergoing an exercise arterial exam?

<p>Compensatory blood flow adaptation (D)</p> Signup and view all the answers

Under what condition should additional digit pressure be evaluated in a patient?

<p>If there is abnormal additional digit pressure (D)</p> Signup and view all the answers

When the brachial artery is obstructed, which statement regarding forearm arteries is TRUE?

<p>Both forearm arteries will show a decrease in pressure (A)</p> Signup and view all the answers

What clinical finding during the Adson maneuver indicates a positive test for thoracic outlet syndrome?

<p>A decrease in the radial pulse vigor from the starting position (C)</p> Signup and view all the answers

Which measurement is most commonly used to assess digit pressure?

<p>7 cm or 2.5 cm cuff measurement (C)</p> Signup and view all the answers

What should be suspected if reduced digit pressure is limited to a single digit?

<p>Disease of the digital artery associated with that digit (D)</p> Signup and view all the answers

What position should the patient adopt when performing the Adson maneuver?

<p>Elbow extended while rotating the head to the affected side (C)</p> Signup and view all the answers

Which action is NOT part of the Adson maneuver procedure?

<p>Having the patient lie flat with their eyes closed (C)</p> Signup and view all the answers

What is the first step in the Adson maneuver process?

<p>Palpating the radial pulse with the elbow extended (B)</p> Signup and view all the answers

What is typically observed in PVR tracings with increased peripheral resistance?

<p>Increased amplitude (C)</p> Signup and view all the answers

Which condition would likely result in normal digital pressures in the upper extremity?

<p>Superior vena cava (SVC) syndrome (B)</p> Signup and view all the answers

What does a loss of diacrotic notch in PVR tracings indicate?

<p>Proximal artery disease (D)</p> Signup and view all the answers

In which situation would reactive hyperemia testing be most appropriate?

<p>Evaluation of new onset of leg claudication (C)</p> Signup and view all the answers

What underlying cause is typically associated with SVC syndrome?

<p>Progressive thrombosis due to adjacent tumor (D)</p> Signup and view all the answers

Which of the following conditions could elevate the risk of developing abnormally low digit pressures?

<p>Raynaud disease (B)</p> Signup and view all the answers

What does new onset left leg claudication primarily indicate?

<p>Possible occlusion in the left lower extremity (C)</p> Signup and view all the answers

What condition is NOT commonly associated with abnormal PPG tracing?

<p>Chronic venous insufficiency (C)</p> Signup and view all the answers

Which of the following is NOT a characteristic of symptomatic peripheral vascular disorders?

<p>Stable rest pain (D)</p> Signup and view all the answers

What physiological change does peripheral vasodilation during exercise primarily facilitate?

<p>Enhanced muscle oxygen delivery (D)</p> Signup and view all the answers

What is the disadvantage of using smaller cuffs in the 4 cuff method for thigh pressure assessment?

<p>They tend to overestimate the thigh pressure. (A)</p> Signup and view all the answers

Which of the following describes the primary purpose of a digit pressure assessment using a cuff?

<p>To measure local blood flow in the digits. (A)</p> Signup and view all the answers

Which statement accurately describes the difference between the 3 cuff and 4 cuff methods for measuring thigh pressure?

<p>The 3 cuff method provides a more accurate measurement of thigh pressure. (A)</p> Signup and view all the answers

What is a potential reason for terminating a treadmill exercise during a lower extremity arterial exam?

<p>The patient reports discomfort in the legs. (C)</p> Signup and view all the answers

What critical information can be obtained from assessing thigh pressure during an arterial exam?

<p>The presence of proximal arterial disease. (A)</p> Signup and view all the answers

In pressure assessments, why is the assessment of wrist pressure with a 7 cm cuff typically preferred?

<p>It better suits smaller anatomical structures. (A)</p> Signup and view all the answers

What is a significant limitation of using the smaller cuffs in arterial pressure measurements?

<p>They may lead to inaccurate limb blood flow readings. (A)</p> Signup and view all the answers

What is the main reason to prefer a larger cuff in the 3 cuff method for thigh pressure assessment?

<p>It accurately accounts for larger thigh dimensions. (A)</p> Signup and view all the answers

When using the 4 cuff method, what must be taken into account regarding cuff sizes?

<p>Different cuff sizes can affect pressure readings. (C)</p> Signup and view all the answers

What may be inferred if a patient exhibits bilateral rest pain relieved by dangling their legs?

<p>The potential for arterial insufficiency (D)</p> Signup and view all the answers

What is a key indicator of significant ischemia in the context provided?

<p>Blackened tips of the 4th and 5th toes (A)</p> Signup and view all the answers

Which measurement indicates a discrepancy in the adequacy of lower extremity evaluation using a smaller cuff?

<p>Thigh pressure overestimated with a 10cm cuff (D)</p> Signup and view all the answers

What implication does having an Ankle Brachial Index (ABI) measurement greater than 1.30 suggest in the context of medial calcification?

<p>Possibility of arteriosclerosis (C)</p> Signup and view all the answers

Which assessment will yield more accurate information than ABI alone in cases of medial calcification?

<p>Toe pressures or PPG/PVR evaluation (C)</p> Signup and view all the answers

How might a history of diabetes affect the evaluation of a patient's vascular health?

<p>Increased risk for vascular calcification and disease (B)</p> Signup and view all the answers

What is a potential consequence of using a 10cm cuff on the thigh of a patient?

<p>Inaccuracy in thigh pressure measurement (B)</p> Signup and view all the answers

Which combination of symptoms could suggest a poor prognosis in a patient with vascular issues?

<p>Blackened toes and thickened toenails (B)</p> Signup and view all the answers

Which anatomical measurement is crucial to fully evaluate lower extremity arterial disease?

<p>Ankle and calf pressures in combination (B)</p> Signup and view all the answers

Which statement accurately reflects the condition of a patient with thickened toenails and dry skin?

<p>Indication of peripheral arterial disease (A)</p> Signup and view all the answers

What is the significance of obtaining at least one additional digital pressure measurement on the left hand during the examination?

<p>To assess for palmar arch disease (A)</p> Signup and view all the answers

What would be the next step if the upper extremity segmental pressures indicate a significant discrepancy between the radial and digital readings?

<p>Consider imaging of the arterial supply (A)</p> Signup and view all the answers

If the digital pressures show a reduction but the arm pressures are normal, what might this imply?

<p>Possible localized vascular obstruction (A)</p> Signup and view all the answers

In a scenario where the second digit pressure readings are significantly lower than other upper extremity pressures, what is most likely the concern?

<p>Localized arterial stenosis (B)</p> Signup and view all the answers

Which combination of pressures suggests an issue with blood supply to the digits despite normal brachial readings?

<p>Brachial LT 132 mmHg and 2nd Digit LT 104 mmHg (A)</p> Signup and view all the answers

Why is it important to compare pressures between the right and left segments in upper extremity assessments?

<p>To highlight the presence of unilateral obstruction (D)</p> Signup and view all the answers

If the radial pressure in the right arm is 144 mmHg while the left arm is 136 mmHg, how should this disparity be interpreted?

<p>It suggests early signs of a vascular issue (B)</p> Signup and view all the answers

What is the primary physiological response during reactive hyperemia following ischemia?

<p>Transient increase in blood flow (C)</p> Signup and view all the answers

When is reactive hyperemia testing particularly beneficial?

<p>For those unable to perform treadmill testing due to mobility restrictions (B)</p> Signup and view all the answers

What is a key characteristic of the recovery time observed during reactive hyperemia testing?

<p>It can be prolonged in cases of arterial disease (D)</p> Signup and view all the answers

Which situation best exemplifies reactive hyperemia?

<p>After the removal of a tourniquet that caused temporary blood flow restriction (B)</p> Signup and view all the answers

What could influence the results of reactive hyperemia testing in a patient with known arterial disease?

<p>Existing collateral circulation in both legs (B)</p> Signup and view all the answers

What Ankle Brachial Index (ABI) range indicates mild to moderate disease?

<p>0.5 - 0.9 (A)</p> Signup and view all the answers

Which statement accurately describes appropriate protocols when managing a patient with DVT during a lower extremity examination?

<p>Never place cuffs on the affected leg to avoid complications. (D)</p> Signup and view all the answers

What is the primary concern of performing cuff pressure measurements on a patient with a known DVT?

<p>It could cause an embolism due to pressure. (A)</p> Signup and view all the answers

What should a sonographer do if a DVT was identified 2 days ago before performing an exam?

<p>Consult with the referring physician before making a decision. (C)</p> Signup and view all the answers

Which of the following statements is false regarding DVT management post-admission?

<p>Anticoagulant therapy can dissolve existing clots rapidly. (C)</p> Signup and view all the answers

Which ABI classification defines a patient with severe disease?

<p>&lt; 0.5 (D)</p> Signup and view all the answers

What is the expected outcome if cuffs are improperly applied to a leg with DVT during pressure examinations?

<p>Potential risk of embolism. (B)</p> Signup and view all the answers

What is the significance of the range 0.9 - 1.0 in ABI measurements?

<p>Indicates no significant arterial disease. (C)</p> Signup and view all the answers

In the context of DVT management, which statement is true regarding the role of anticoagulant therapy?

<p>It helps to prevent further clot formation. (B)</p> Signup and view all the answers

What ABI value would likely suggest patient status is unchanged from earlier assessments?

<p>0.9 - 1.0 (B)</p> Signup and view all the answers

What is a key difference in the ankle pressure response between claudication and pseudoclaudication during exercise?

<p>Claudication shows a drop in ankle pressure (D)</p> Signup and view all the answers

Which condition is associated with normal Ankle-Brachial Index (ABI) despite symptoms of leg pain?

<p>Pseudoclaudication (D)</p> Signup and view all the answers

In the context of segmental pressure measurements, what is indicative of a potential issue with vascular flow?

<p>Ankle pressure significantly lower than proximal thigh pressure (C)</p> Signup and view all the answers

What type of cause is responsible for symptoms in pseudoclaudication?

<p>Orthopedic or neurogenic issues (C)</p> Signup and view all the answers

Which of the following findings suggests a normal ankle pressure response during exercise?

<p>Stable ankle pressure despite exercise (B)</p> Signup and view all the answers

What does the absence of a drop in ankle pressure with exercise indicate?

<p>Underlying orthopedic or neurogenic condition (B)</p> Signup and view all the answers

Which statement accurately describes the ABI readings in a patient with pseudoclaudication?

<p>ABI will be normal (D)</p> Signup and view all the answers

What abnormality could be indicated by a segmental pressure exam showing decreased ankle pressure compared to the proximal thigh pressure?

<p>Potential ischemia (D)</p> Signup and view all the answers

During a segmental pressure exam, what expected difference should be noted between proximal thigh and brachial pressures?

<p>Proximal thigh should be higher by 30-40 mmHg (D)</p> Signup and view all the answers

Which finding in an ABI measurement suggests severe arterial disease?

<p>ABI of 0.60 (C)</p> Signup and view all the answers

What should be done immediately if a patient reports leg or chest pain during an examination?

<p>Terminate the examination immediately (C)</p> Signup and view all the answers

What is a likely complication when performing a segmental pressure exam using the arm with a hemodialysis graft?

<p>The graft may fail due to external pressure (D)</p> Signup and view all the answers

In which situation might a patient with chronic renal failure undergo a segmental pressure exam seated rather than supine?

<p>If they experience discomfort lying flat for long periods (D)</p> Signup and view all the answers

What physiological change might mediate an overestimation of ankle pressures in patients with diabetes?

<p>Medial calcification in arterial walls (C)</p> Signup and view all the answers

Which factor may lead a patient with claudication to experience pseudoclaudication rather than classic claudication?

<p>Intrinsic neurological deficits affecting limb sensation (C)</p> Signup and view all the answers

What critical measure should be taken during a segmental pressure exam for patients with a dialysis graft?

<p>Avoid using the arm with the graft for any control measurements (A)</p> Signup and view all the answers

During segmental pressure examinations, what should be prioritized when a patient feels discomfort?

<p>Terminate the evaluation and assess the patient thoroughly (B)</p> Signup and view all the answers

What symptom indicates the need for immediate cessation of an exercise evaluation in vascular assessments?

<p>Sudden onset of pain in the chest or legs (B)</p> Signup and view all the answers

When performing a segmental pressure examination, what is one critical point regarding blood pressure measurement in patients with renal disease?

<p>An arm with a hemodialysis graft should be avoided for all measurements (C)</p> Signup and view all the answers

Flashcards

Brachial Pressure

A pressure measurement taken in the upper arm, specifically in the brachial artery.

Ankle-Brachial Index (ABI)

A measurement used to assess the health of the arteries in the legs. It compares the blood pressure in the ankles to the blood pressure in the arms.

Low ABI

An ABI value below 0.90 indicates a potential arterial disease.

Aortoiliac Disease

A condition where the arteries that supply blood to the legs are narrowed or blocked, leading to reduced blood flow.

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Prominent Dicrotic Notch

A prominent dicrotic notch on the arterial PPG waveform indicates normal blood flow.

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Abnormal Arterial PPG Waveform

A slow upslope and downslope on the arterial PPG waveform can indicate reduced blood flow.

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ABI of 0.77

An ABI of 0.77 indicates a moderate level of peripheral artery disease (PAD), suggesting some degree of arterial blockage or narrowing.

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Normal ABI Range

An ABI value between 0.9 to 1.3 indicates healthy arteries in the legs.

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High ABI (> 1.3)

An ABI value above 1.3 suggests hardening of the arteries with calcification.

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ABI Range for Claudication

An ABI value between 0.5 and 0.9 indicates mild to moderate arterial disease, often causing pain during walking.

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ABI Range for Severe Arterial Disease

An ABI value below 0.5 suggests severe arterial disease, potentially causing wounds that are hard to heal.

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Thigh Pressure

This is a measurement of the blood pressure in the thigh, which should be 30-40 mmHg higher than the brachial pressure.

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Large Pressure Difference Between Segments

This indicates a significant difference in blood pressure between adjacent areas of the leg.

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Toe/Brachial Index

This is a measurement of the blood pressure in the toes compared to the brachial pressure.

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Subclavian Steal Syndrome

A condition where blood flow is reversed in the subclavian artery due to a blockage or narrowing in the proximal portion of the vessel. This reversed flow often results in a decrease in blood flow to the arm and hand.

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Post-Occlusive Reactive Hyperemia

A test that measures blood flow in the legs by inflating a cuff around the calf and then observing how quickly the blood flow returns after the cuff is released.

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Upper Extremity Segmental Pressure Exam

A test that measures blood flow in the upper extremities by comparing blood pressure measurements at different points in the arm.

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30 mmhg Drop in Pressure between Upper Arm and Radial Artery

A decrease in blood pressure between the upper arm and the radial artery, indicating a potential narrowing or blockage of the radial artery.

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Moderate PAD

An ABI value between 0.70 and 0.90 indicates a moderate level of peripheral artery disease (PAD), suggesting some degree of arterial blockage or narrowing, but the symptoms may not be severe.

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Critical Ischemia

A significant narrowing or blockage of the arteries supplying blood to the legs leading to poor blood flow, often requiring immediate medical intervention.

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Exercise Evaluation for Peripheral Artery Disease

A test where a patient walks for 5 minutes or more without experiencing pain, signifying normal blood flow to the legs.

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Ankle Pressure Post-Exercise

Ankle pressures should return to normal levels within 5 minutes after stopping exercise, indicating good blood flow.

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Stenosis

A narrowing of an artery, typically by more than 50%, which restricts blood flow.

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Peripheral Vasodilation

The ability of blood vessels to widen in response to increased blood flow, typically during exercise.

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Segmental Pressures

A measurement of the difference in blood pressure between the upper and lower legs, especially the thigh.

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Collateral Circulation

Blood vessels that develop to provide alternative routes for blood flow to bypass blockages or narrowing in arteries.

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Biphasic Waveforms

Waveforms that show two distinct peaks on the Doppler ultrasound, suggesting normal blood flow.

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Collateral Flow Compensation

The ability of the body to maintain normal blood flow to tissues despite the presence of blockages or narrowing in arteries.

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Four Cuff Method

A technique used to measure the blood pressure in different segments of the legs. Four cuffs are placed on the upper thigh, lower thigh, calf, and ankle.

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Proximal Thigh Pressure Exceeds Brachial

The normal pressure difference between the upper thigh and the brachial pressure. It typically ranges from 30-40 mmHg.

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Proximal Thigh Pressure Exceeds Brachial

The normal pressure difference between the proximal thigh and the brachial pressure. It typically ranges from 30-40 mmHg. This difference is typically greater in the proximal thigh due to the higher pressure needed to overcome the resistance of blood flow through the larger arteries of the thigh.

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Adson maneuver

A physical examination maneuver used to diagnose Thoracic Outlet Syndrome (TOS), a condition that affects the nerves and blood vessels in the space between the collarbone and first rib.

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Adson Maneuver - Positive Test

A physical assessment that checks for abnormalities in the radial pulse during specific movements. A positive test signifies a potential issue with the nerves or blood vessels in the neck and shoulder.

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Thoracic Outlet Syndrome (TOS)

The condition affecting nerves and blood vessels in the space between the collarbone and first rib, usually causing pain, numbness, tingling, and impaired circulation in the arm and hand.

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Wrist Pressure

The measurement of blood pressure taken at the wrist using a specialized cuff.

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Digit Pressure

A measurement of blood pressure taken in individual fingers, which helps assess blood flow in the digital arteries.

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3 Cuff Segmental Pressure Exam

A method of measuring blood pressure in the thigh using three separate cuffs placed on the upper thigh, lower thigh, and calf. It is considered the most accurate method for thigh pressure assessment.

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Digit Pressure Cuff Size

A smaller cuff (2.5 cm) is used to assess digit pressure, while a larger cuff (7 cm) is typically used for assessing wrist pressure.

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4 Cuff Method

A technique for evaluating blood flow in the legs by using four cuffs placed on the upper thigh, lower thigh, calf, and ankle.

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Cuff Size Comparison (4 Cuff vs. 3 Cuff)

In the 4 Cuff Method, the smaller cuffs used for thigh pressure are typically smaller than the cuff used in the 3 Cuff method.

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Accuracy of Smaller Cuffs in 4 Cuff Method

The smaller cuffs used in the 4 Cuff Method tend to overestimate the thigh pressure compared to the larger cuff used in the 3 Cuff Method.

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Accuracy of Larger Cuff in 3 Cuff Method

The larger cuff used in the 3 Cuff Method provides a more accurate thigh pressure measurement compared to the smaller cuffs used in the 4 Cuff Method.

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What is pseudoclaudication?

A condition that mimics claudication but is not caused by decreased blood flow. Instead, it results from orthopedic or neurogenic issues (like nerve compression or spinal stenosis).

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What is Stenosis?

A narrowing or blockage of an artery, which restricts blood flow. This is a common cause of claudication and other circulatory problems.

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What is Collateral Circulation?

Blood vessels that develop to provide alternative routes for blood flow when a primary artery is blocked or narrowed. They help maintain circulation to tissues.

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What is Peripheral Vasodilation?

The ability of the body to widen blood vessels in response to increased blood flow, especially during exercise. This is a normal response that helps deliver more oxygen to working muscles.

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What are Segmental Pressures?

A measurement of the difference in blood pressure between the upper and lower legs, especially the thigh. This test helps identify potential blockages in arteries.

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What is the Four Cuff Method?

A technique used to measure the blood pressure in different segments of the legs. Four cuffs are placed on the upper thigh, lower thigh, calf, and ankle.

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What is an Exercise Evaluation for Peripheral Artery Disease?

A test where the patient walks for a specific duration without experiencing pain. This usually indicates normal blood flow to the legs.

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What is Critical Ischemia?

A significant narrowing or blockage of the arteries supplying blood to the legs, causing very low blood flow. This is a serious condition that requires immediate medical attention.

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What is Thoracic Outlet Syndrome (TOS)?

A condition affecting nerves and blood vessels in the space between the collarbone and first rib, often causing pain, numbness, tingling, and impairment of circulation in the arm and hand.

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What is the Adson Maneuver?

A physical examination maneuver used to diagnose Thoracic Outlet Syndrome (TOS). It involves specific movements to assess the radial pulse.

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What is reactive hyperemia?

Reactive hyperemia is the temporary increase in blood flow to an area that was previously deprived of oxygen due to a lack of blood supply. This occurs after the blockage is removed, allowing for a rush of blood to the area.

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What does a segmental pressure exam measure?

Segmental pressure exams measure blood pressure at different points in the leg to assess the health of the arteries and identify potential blockages. Pressure differences between segments can indicate narrowing or blockages in specific areas.

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What is the purpose of reactive hyperemia testing?

Reactive hyperemia testing helps assess the health of arteries in the legs by simulating exercise for patients unable to perform treadmill tests. Occlusive cuffs are used to restrict blood flow, and then the rate of blood flow recovery is measured after the cuffs are released.

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What does a 30 mmHg drop in pressure between the upper arm and radial artery indicate?

A decrease in blood pressure between the upper arm and the radial artery suggests a potential narrowing or blockage of the radial artery. This can be an early sign of peripheral artery disease.

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What is the four-cuff method for segmental pressure exam?

The four-cuff method for segmental pressure measurement uses cuffs placed on the upper thigh, lower thigh, calf, and ankle to assess blood flow in the legs. This is a common method for diagnosing peripheral artery disease.

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What is the Ankle-Brachial Index (ABI)?

It is a ratio that compares the blood pressure in the ankles to the blood pressure in the arms. It helps assess the health of the arteries in the legs.

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What does a low ABI indicate?

An ABI value below 0.9 indicates a potential arterial disease.

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What is Aortoiliac Disease?

It is a condition impacting the arteries delivering blood to the legs, resulting in narrowed or blocked vessels and reduced blood flow.

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What does a prominent dicrotic notch on a PPG waveform suggest?

A prominent dicrotic notch on the arterial PPG waveform indicates normal blood flow.

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What does an abnormal arterial PPG waveform look like?

An abnormal arterial PPG waveform is characterized by a slow upslope and downslope, suggesting reduced blood flow.

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What does an ABI of 0.77 indicate?

It indicates a moderate level of peripheral artery disease (PAD).

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What is the normal pressure difference between the proximal thigh and the brachial pressure?

The pressure measured in the proximal thigh should be 30-40mmHg higher than the brachial pressure.

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What does a large pressure difference between leg segments indicate?

A large pressure difference between segments indicates a significant difference in blood pressure between adjacent areas of the leg, suggesting a possible blockage or narrowing of the artery.

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What does a large pressure drop between the thigh and the calf suggest?

If the pressure in the calf is much lower than the pressure in the thigh, it may suggest a narrowing or blockage in the popliteal artery, which is located behind the knee.

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What does the Catacrotic limb of a PPG waveform show?

The Catacrotic limb indicates the rate of blood flow after the peak systolic pressure declines.

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What are the different cuff sizes used for wrist and digit pressure?

A cuff size of 7 cm is typically used for assessing wrist pressure, while a smaller cuff size of 2.5 cm is used to assess digit pressure.

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What does a significant drop in pressure between the upper arm and radial artery indicate?

A decrease in pressure between the upper arm and the radial artery (30 mmHg or more) suggests a potential narrowing or blockage of the radial artery. This can be an early sign of peripheral artery disease.

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What is digit pressure?

A smaller 2.5 cm cuff is used to measure blood pressure in individual fingers to assess blood flow in the digital arteries.

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What is wrist pressure?

A larger 7 cm cuff is typically used to assess blood pressure at the wrist.

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What is the 3 Cuff Segmental Pressure Exam?

This method is considered the most accurate way to assess thigh pressure. It involves using three separate cuffs placed on the upper thigh, lower thigh, and calf.

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What is the 4 Cuff Method?

This technique uses smaller cuffs to obtain two separate thigh pressure readings, one for the upper thigh and one for the lower thigh.

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What is the difference in accuracy between the 4 Cuff Method and the 3 Cuff Method?

The smaller cuffs used in the 4 Cuff Method often tend to overestimate thigh pressure compared to the larger cuff used in the 3 Cuff Method.

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Why is a noisy treadmill NOT a valid reason to terminate a lower extremity arterial exam?

A patient complaining about noise on the treadmill is not a valid reason to terminate an exercise test for a lower extremity arterial exam. It's important to continue the test unless there are other medical concerns.

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What is the expected pressure difference between the proximal thigh and the brachial pressure?

The pressure in the proximal thigh should be 30-40 mmHg higher than the brachial pressure. This difference can vary based on the individual.

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Peripheral Artery Disease (PAD)

A condition where the arteries supplying blood to the legs are narrowed or blocked, leading to restricted blood flow. This can cause pain, cramping, numbness, or even wounds that are hard to heal.

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Thigh Pressure Measurement

This is a measure of blood pressure in the thigh. It is important in diagnosing and managing peripheral artery disease (PAD).

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Smaller Cuff Size Effect on Thigh Pressure

Using a cuff size too small for the thigh can overestimate the blood pressure, making it seem higher than it actually is.

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Pseudoclaudication

This is a condition that mimics claudication (leg pain with walking) but is not caused by decreased blood flow. Instead, it could be related to nerve compression or spinal stenosis.

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Segmental Pressure Exam

A measurement of pressure differences between different segments of the leg (thigh, calf, ankle). It assists in pinpointing potential areas of blockage or narrowing.

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Digit Pressure Measurement

Using a specialized cuff on the digits (fingers or toes), this measures blood pressure in these smaller arteries to assess circulation and identify potential problems.

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Normal Toe Pressure

Toe pressure is considered normal if it is at least 60% of the systolic brachial pressure, which translates to 70 mmHg or more for a brachial pressure of 116 mmHg.

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False Ankle Pressure Reduction

A false reduction in ankle pressure can occur if the cuff is too large, leading to an inaccurate reading.

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Extensive Collateral Formation

The development of new blood vessels (collateral formation) can compensate for blockage in the arteries, allowing for a seemingly normal exercise exam even after an abnormal resting exam.

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Cuff Too Loose

A cuff that is too loose during the ankle pressure test can lead to a false elevation of the ankle pressure reading.

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Brachial Obstruction Impact

A brachial obstruction affects the pressure in both the radial and ulnar arteries in the forearm, as they both receive blood from the brachial artery.

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SVC Syndrome

Progressive thrombosis of the SVC, usually related to an adjacent malignant tumor formation.

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Reactive Hyperemia

Reactive hyperemia is the temporary increase in blood flow to an area that was previously deprived of oxygen due to a lack of blood supply. This occurs after the blockage is removed, allowing for a rush of blood to the area.

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Noisy treadmill

A patient complaining about noise on the treadmill is not a valid reason to terminate an exercise test for a lower extremity arterial exam. It's important to continue the test unless there are other medical concerns.

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Significant Pressure Drop

A decrease in pressure between the upper arm and the radial artery (30 mmHg or more) suggests a potential narrowing or blockage of the radial artery. This can be an early sign of peripheral artery disease.

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Normal Thigh Pressure

The pressure in the proximal thigh should be 30-40 mmHg higher than the brachial pressure. It's a normal finding and indicates that the blood flow is adequate to the leg.

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Medial Calcification in Dialysis Patients

A diabetic patient with a history of chronic renal failure and dialysis treatment may have medial calcification, leading to an overestimation of ankle pressures during a segmental pressure exam.

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Hemodialysis Graft and BP Measurements

A patient with a hemodialysis graft should never have their arm used for blood pressure measurements. Applying external pressure to the arm can cause graft failure.

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Terminating Exercise Test

Whenever a patient reports pain in their legs or chest during an exercise test, the exam should be terminated immediately.

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Recording Segmental Exam Data

A segmental pressure exam should always record the duration of the exercise, location of the symptoms, and any changes in ankle pressures.

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Dialysis Patients & Segmental Exam

A diabetic patient with a history of chronic renal failure and dialysis treatment may not be able to stay in a supine position for long, requiring adjustments to the segmental pressure exam.

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Supine Position & Dialysis

The supine position should be avoided in dialysis patients due to potential health issues, so the segmental pressure exam may need to be performed with the patient seated.

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Noisy Treadmill & Exam

A noisy treadmill is not a valid reason to terminate a lower extremity arterial exam. It's crucial to continue the test unless other medical concerns arise.

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Exercise Test & Claudication

For a patient with claudication, leg pain will not be associated with a drop in ankle pressure during an exercise test. This indicates pseudoclaudication, not true vascular issues.

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What does a significant pressure drop between the upper arm and the radial artery indicate?

A decrease in pressure between the upper arm and the radial artery (30 mmHg or more) suggests a potential narrowing or blockage of the radial artery. This can be an early sign of peripheral artery disease.

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How should a lower extremity segmental pressure exam be performed on a patient with recent DVT?

If a patient has suspected or known acute deep venous thrombosis (DVT), doppler waveforms and TBI should be used, and cuffs should never be placed on a leg with DVT. Anticoagulant therapy helps prevent clot propagation, but it does not provide thrombolytic therapy and the DVT likely will not have recanalized in such a short period of time.

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Is a noisy treadmill a valid reason to terminate a lower extremity arterial exam?

A noisy treadmill is not a valid reason to terminate a lower extremity segmental pressure exam. Continue the test unless there are other medical concerns.

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How does cuff size affect thigh pressure measurement?

Using a cuff size that is too small for the thigh can overestimate the blood pressure, making it appear higher than it actually is.

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What are segmental pressures used for?

Segmental pressures measure pressure differences between various leg segments, such as the thigh, calf, and ankle. This helps pinpoint potential blockages in arteries.

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What does a significant drop in pressure between the upper arm and the radial artery indicate?

A decrease in pressure between the upper arm and the radial artery of 30 mmHg or more suggests a potential narrowing or blockage of the radial artery.

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What can cause a false reduction in ankle pressure reading?

A false reduction in ankle pressure during an exam can occur if the cuff is too large, leading to an inaccurate reading.

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What is digit pressure measurement?

Digit pressure measurement assesses blood flow in smaller arteries of the fingers or toes using a specialized cuff.

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Study Notes

Physiological PT I

  • An upper extremity segmental pressure exam produces specific pressures.
  • Brachial pressures are measured on the right and left (e.g., right 140mmHg, left 132mmHg).
  • Radial pressures are measured on the right and left (e.g., right 144mmHg, left 136mmHg).
  • Ulnar pressures are measured on the right and left (e.g., right 138mmHg, left 138mmHg).
  • The 2nd digit pressures are measured on the right and left (e.g., right 130mmHg, left 104mmHg).

Additional Information (Physical Exam Procedures)

  • If arm pressures are normal, but digital pressure is abnormally reduced, examine one more digit on the left hand.
  • If additional digital pressure is abnormal, likely disease in the palmar arch is the cause of decreased digit pressures.
  • If additional digital pressure is normal, test remaining digits to ensure reduced pressure is isolated to a single digit and to check digital artery for disease.

Thoracic Outlet Syndrome

  • The Adson maneuver evaluates flow changes with thoracic outlet syndrome.
  • Palpate radial pulse on the affected side, and extend the elbow and neck.
  • Have the patient rotate head to the side being tested.
  • Have the patient abduct and laterally rotate the shoulder from this position.
  • Have the patient take a deep breath and hold while assessing pulse response.
  • A decreased pulse vigor from initial position to the final position is a positive test.

Segmental Thigh Pressure Exam

  • The 4 cuff method uses two smaller cuffs to obtain separate thigh pressures.
  • These cuffs are generally smaller than the larger cuff used in the 3 cuff method.
  • Smaller cuffs tend to overestimate thigh pressure; the larger more accurately measures.

Lower Extremity Exam Termination

  • If a patient reports pain in their leg or chest, terminate the exam.
  • Record exercise duration, symptom location, and any changes in ankle pressure.

Segmental Pressure Exam Complication for Dialysis Patients

  • Dialysis patients should be seated in a chair rather than lying down for more than a few minutes.
  • The arm without the dialysis port should be the only arm measured in this case.
  • Medial calcification can lead to overestimation of ankle pressures in some patients, and this needs to be considered during the diagnosis.

Response to Exercise in Patients with Pseudoclaudication

  • Pseudoclaudication has a neurogenic or orthopedic cause and is not ischemic.
  • The ABI will be normal and there will be no drop in ankle pressure with exercise in patients with pseudoclaudication.

Segmental Pressure Findings

  • The right arm pressure is 142 mmHg.
  • The right leg proximal thigh pressure is 140 mmHg; the right leg distal thigh is 126 mmHg, the right calf is 116 mmHg and the right ankle is 112 mmHg.
  • Different results could indicate possible aortoiliac disease, or possible intrinsic compression of the iliac artery by the pelvic mass.

Normal Arterial PPG Waveform Characteristics

  • A normal arterial PPG waveform has a dicrotic notch.
  • It has a slow upslope and downslope.
  • There is little difference between systolic and diastolic blood volumes.

ABI Interpretation and Implications

  • ABI of 0.77 indicates disease.
  • An ABI of 0.5-0.9 indicates mild-moderate disease.
  • An ABI of < 0.5 indicates severe disease.

General Information

  • Normal lower extremity arterial response to reactive hyperemia (35% drop in ankle pressures that return to normal in 1 minute following cuff release)
  • A patient with leg pain but not with symptoms during exercise needs another form of examination.

Interpretation of Digit Tracings in PPG

  • Normal waveforms are triphasic and show sharp systolic upstrokes, brief diastolic reversals, and final forward flow during late diastole.
  • Abnormal waveforms, such as monophasic or absent waveforms, suggest impaired distal perfusion due to occlusion or obstruction of digital arteries.
  • Abnormal digital tracing with normal ABI indicates adequate blood flow in larger arteries but obstruction in the digital arteries causing distal perfusion impairment.
  • This scenario is often seen alongside thrombi or emboli obstructing the smaller digital arteries, though larger arteries retain adequate flow.

Additional Information

  • When abnormal digit tracings are observed along with normal ABIs, it suggests adequate blood flow to larger arteries such as the femoral and popliteal arteries.
  • One potential cause of embolic obstruction in digital arteries is the presence of abdominal aortic aneurysm (AAA).
  • Aortic aneurysms can develop emboli, obstructing smaller distal arteries in digits.
  • Evaluation for AAA is warranted when normal ABIs but abnormal digit tracings are noted to identify a possible source of emboli.
  • This evaluation may involve imaging studies like ultrasound, CT angiography, or magnetic resonance angiography (MRA) of the abdominal aorta.

Popliteal Entrapment Evaluation

  • PPG sensor evaluation to record flow changes during calf muscle contraction (active plantar or dorsiflexion of the foot).

Venous Photoplethysmography (PPG):

  • Documents venous insufficiency
  • Detects hemoglobin levels in legs
  • Normal: tracing drops until dorsiflexions stop, then rises slowly as veins refill.
  • Abnormal: tracing drops less significantly, rising quickly; venous reflux refills veins faster than arterial inflow.

Venous Refill Time (VRT):

  • Measures time for veins to refill after emptying (dorsiflexion).
  • Normal VRT is 20 seconds or greater.
  • Short VRT (less than 20 seconds) indicates venous insufficiency.

Air Plethysmography (APG)

  • Detects venous insufficiency
  • Quantifies venous reflux
  • Evaluates calf muscle pump function.
  • Measures venous volume changes in different positions (legs elevated, supine, standing, toe-ups).
  • This provides information about venous filling time, functional venous volume, ejection fraction of calf muscles, and residual venous volume.

Key Components of Air Plethysmography Chart

  • Normal VRT suggests normal venous function, while abnormal VRT suggests venous insufficiency.

Segmental Pressure Exam for Lower Extremity Insufficiency

  • A minimum of 30 seconds between augmentation maneuvers.

Doppler Ultrasound of Lower Extremities

  • Doppler ultrasound is used to identify venous disease.
  • Patients positioned in 60-degree reverse Trendelenburg position with contrast injection into the dorsal vein.
  • Image monitored during breathing maneuvers to assess venous insufficiency.

Impedance Plethysmography

  • Non-invasive
  • Diagnoses abnormalities in venous/arterial systems, often in limbs.
  • Used to detect deep vein thrombosis (DVT).
  • Electrodes placed on skin to measure impedance changes due to blood flow changes in vessels.

Strain Gauge Plethysmography

  • Measures blood flow through changes in limb circumference
  • Non-invasive
  • Detects abnormalities in circulatory system
  • Evaluates venous function and detects issues like venous insufficiency or DVT

PPG Tracing and Size Control

  • Use a constant size setting for the photoplethysmography (PPG) system to best demonstrate changes in blood volume between different toes or feet.
  • Changes in the size setting must be documented on the tracing.

Post-Exercise ABI Recovery Time

  • Normal post-exercise recovery is 2–6 minutes, indicating a single-level arterial issue like stenosis. -Recovery time >6 minutes suggests multi-level arterial disease.

Limitations of Segmental Pressure Exams Compared to Doppler

  • Segmental pressure cannot differentiate between external and common iliac stenosis/occlusion.
  • Segmental pressures help assess the level of problem within the extremity, but don't determine the exact extent of stenosis or obstruction.
  • Without doppler, you can't determine if the obstruction is in the iliac or common femoral artery. -Without a Doppler ultrasound, you cannot find out if the obstruction is in the popliteal artery.

Using 12 cm Cuffs in Lower Extremity Exam

  • 12 cm or larger cuffs overestimate the normal thigh pressure.
  • When using larger cuffs, pressures are underestimated in the calf, ankle and arms.

Additional Information

  • Normal venous refill time (VRT) should be at least 20 seconds.

Other Information

  • A 30mmHg drop in pressure between the upper arm and radial artery at the forearm indicates radial artery disease.
  • A 70 mmHg toe pressure is considered normal if the systolic brachial pressure is 116 mmHg.
  • Toe pressures less than 30 mmHg or ankle pressures less than 50 mmHg are associated with non-healing wounds.
  • 2 mph at a 12% grade is the standard treadmill speed for exercise testing.
  • A patient experiencing rest pain and relief after sitting may have a single-level stenosis.
  • A lower extremity PPG exam shows normal readings of 30 seconds and 23 seconds on the right and left legs, respectively, and the next step is repeating the VRT assessment with a tourniquet on the right leg.
  • For a patient with a suspected Raynaud syndrome, place the PPG sensors on the finger tips before and after cold sensitivity testing to detect blood flow changes.
  • If a patient has a prior history of untreated multilevel disease in the right leg, it may limit their treadmill tolerance for the left leg. Reactive hyperaemia testing is the best way to assess for new-onset left leg claudication.
  • Using a tourniquet during a venous PPG exam on the leg helps to determine if venous insufficiency is superficial or deep. This is because, when the venous refill time (VRT) is initially less than 20 seconds, a tourniquet is placed at the groin to isolate superficial venous flow, and VRT is measured again. If VRT improves when the tourniquet is in place, insufficiency is likely in the superficial system only; otherwise, it is in the deep system.

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