Module 4 Lecture. Inflammation and Vascular Monitoring

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Questions and Answers

In the context of inflammation, what happens to the glycocalyx layer on endothelial cells?

  • It remains unchanged, unaffected by inflammation.
  • It becomes thicker, preventing the movement of substances.
  • It is completely destroyed, leading to a complete loss of barrier function.
  • It is damaged, allowing for easier movement of substances. (correct)

What is the typical percentage of albumin lost from the vascular space into the interstitial space?

  • 5% or less (correct)
  • 1% or less
  • 15% or less
  • 10% or less

In the context of inflammation, what happens to the permeability of the vascular space?

  • It remains the same, there is no significant change.
  • It decreases, limiting the movement of fluids and substances.
  • It increases, allowing for increased movement of fluids and substances. (correct)
  • It fluctuates randomly, making fluid movement unpredictable.

How might inflammation affect albumin levels?

<p>It can lead to a decrease in albumin levels. (C)</p> Signup and view all the answers

Which of the following monitoring techniques is considered a standard monitor for assessing volume status?

<p>Non-invasive blood pressure cuff and heart rate monitoring (D)</p> Signup and view all the answers

What type of monitoring might be required for a patient with a complex surgery or significant comorbidities?

<p>More advanced monitoring, such as arterial lines, cardiac output monitoring, or central lines. (D)</p> Signup and view all the answers

What type of parameters are primarily used to assess volume status?

<p>Both static and dynamic parameters offer complementary information. (C)</p> Signup and view all the answers

Why is it crucial to monitor intravascular volume status?

<p>It's essential for proper fluid and electrolyte management. (D)</p> Signup and view all the answers

Why is controlled mechanical ventilation used when assessing respiratory variation?

<p>It ensures a consistent tidal volume and pressure for each breath. (D)</p> Signup and view all the answers

Which of these factors can affect the accuracy of respiratory variation assessment?

<p>Stable vasomotor tone and cardiac function. (A), Presence of a fever or infection. (C)</p> Signup and view all the answers

What is the main purpose of monitoring respiratory variation?

<p>To evaluate the patient's fluid status. (A)</p> Signup and view all the answers

What happens to intrathoracic pressure during positive pressure ventilation?

<p>Increases due to the forced air delivery. (A)</p> Signup and view all the answers

How does increased intrathoracic pressure potentially affect cardiovascular function?

<p>It reduces venous return and ventricular filling. (D)</p> Signup and view all the answers

Which of the following parameters can be used to assess respiratory variation?

<p>All of the above. (D)</p> Signup and view all the answers

What is the significance of observing a significant drop in blood pressure during inspiration?

<p>It may be a sign of hypovolemia or reduced vascular volume. (A)</p> Signup and view all the answers

Why is it important to consider the overall clinical picture in addition to dynamic parameters?

<p>The overall clinical picture is a more accurate assessment of the patient's condition. (A), Dynamic parameters can be influenced by other factors besides fluid status. (C)</p> Signup and view all the answers

Which method is NOT commonly used for measuring cardiac output in the operating room?

<p>Expiratory Occlusion Test (D)</p> Signup and view all the answers

What is the main principle behind the use of a phenylephrine drip in determining cardiac output?

<p>It increases afterload, potentially hindering accurate cardiac output assessment. (B)</p> Signup and view all the answers

By interrupting an arterial blood gas (ABG) and analyzing the lactate level, what key information about tissue perfusion can be deduced?

<p>Whether there is sufficient oxygen being delivered to the tissues. (C)</p> Signup and view all the answers

What is the primary difference between the Expiratory Occlusion Test and the Respiratory Variation (SVV) method for assessing fluid responsiveness?

<p>The Expiratory Occlusion Test is less sensitive to arrhythmias and spontaneous ventilation. (A)</p> Signup and view all the answers

Which of these methods uses a pulse oximeter to assess fluid responsiveness?

<p>Pleth Variability Index (C)</p> Signup and view all the answers

Which of these methods is considered a non-invasive method to measure cardiac output?

<p>All of the above (D)</p> Signup and view all the answers

What is the primary function of CO2 rebreathing in assessing fluid responsiveness?

<p>It helps to calculate cardiac output based on changes in end-tidal CO2 and CO2 excretion. (A)</p> Signup and view all the answers

What does an increase in lactate levels indicate?

<p>A decrease in oxygen delivery to the tissues. (B)</p> Signup and view all the answers

What is a common symptom of iron deficiency?

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

Which of the following is NOT a potential cause of iron deficiency?

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

What is the primary role of iron in the body?

<p>Red blood cell production (D)</p> Signup and view all the answers

What is the main reason why iron deficiency can lead to anemia?

<p>Decreased oxygen-carrying capacity of red blood cells (D)</p> Signup and view all the answers

What is a potential risk associated with blood transfusions?

<p>Increased risk of infection (C)</p> Signup and view all the answers

What is the role of reticuloendothelial cells in iron metabolism?

<p>Storage and release of iron (A)</p> Signup and view all the answers

How does the body respond to an increase in the need for hemoglobin production?

<p>Release of iron stores (B)</p> Signup and view all the answers

What is agglutination?

<p>The clumping of red blood cells (C)</p> Signup and view all the answers

What is the recommended transfusion time frame for Cryoprecipitate (Cryo)?

<p>Within 4 hours (B)</p> Signup and view all the answers

What is the primary reason for administering Cryo to patients?

<p>To increase fibrinogen levels (C)</p> Signup and view all the answers

What is the standard dosage of Cryoprecipitate for a patient weighing 80 kilos?

<p>4 units (C)</p> Signup and view all the answers

What is the typical storage temperature for platelet preparations?

<p>22°C (B)</p> Signup and view all the answers

What is a potential risk associated with platelet transfusion?

<p>Increased risk of bacterial growth (C)</p> Signup and view all the answers

What is the typical lifespan of platelets in the body?

<p>8 to 12 days (D)</p> Signup and view all the answers

Why are platelets often leuko-reduced before transfusion?

<p>To reduce the risk of immune reactions (D)</p> Signup and view all the answers

How much can a single-donor apheresis platelet pack increase a recipient's platelet count?

<p>30,000 to 50,000 (B)</p> Signup and view all the answers

Which of the following is a potential risk of using large volumes of balanced salt solutions like Lactated Ringer's (LR)?

<p>Hyperlactatemia and metabolic alkalosis (B)</p> Signup and view all the answers

What is the primary concern regarding the use of normal saline in patients with renal insufficiency?

<p>Inability to effectively excrete potassium (A)</p> Signup and view all the answers

Which of the following statements is TRUE regarding the use of balanced salt solutions in patients with normal potassium levels?

<p>These solutions are usually safe to use as they contain a low amount of potassium. (B)</p> Signup and view all the answers

Which of the following is a characteristic of colloids?

<p>They contain macromolecules that help retain fluid in the vascular space. (D)</p> Signup and view all the answers

Why might 25% albumin be used instead of 5% albumin?

<p>25% albumin is preferred for patients with severe fluid overload. (C)</p> Signup and view all the answers

Which of the following is NOT a reason why normal saline might be used for a patient with renal insufficiency?

<p>It is less likely to cause metabolic acidosis than balanced salt solutions. (D)</p> Signup and view all the answers

Which of the following situations might warrant the use of 25% albumin instead of 5% albumin?

<p>A patient with severe hypovolemia requiring rapid volume expansion. (A)</p> Signup and view all the answers

Which type of intravenous fluid is MOST LIKELY to be used in a patient with normal potassium levels who needs fluid replacement but has a history of renal dysfunction?

<p>Lactated Ringer's (A)</p> Signup and view all the answers

Flashcards

Glycocalyx

A protective layer on endothelial cells that can be damaged during inflammation.

Transcellular movement

The movement of substances across the cell membrane.

Paracellular movement

The movement of substances between adjacent cells.

Albumin movement

Normal albumin leakage from blood vessels into tissue is about 5%.

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Inflammation effects

Inflammation can increase albumin movement by 2 to 4 times.

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Monitoring volume status

Evaluating intravascular volume to guide medical therapy.

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Static parameters

Measurements representing a single moment in time for assessing volume.

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Dynamic parameters

Measurements that assess changes in volume status over time.

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Hyperchloremic Metabolic Acidosis

A condition caused by elevated chloride levels, often due to large volumes of normal saline administration.

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Balanced Salt Solutions

IV solutions like Lactated Ringer's that contain electrolytes in physiological concentrations used to maintain fluid balance.

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Hyperlactatemia

An elevated level of lactate in the blood often associated with the administration of large volumes of Lactated Ringer's solution.

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Metabolic Alkalosis

A disturbance where the body fluids have excess base (alkali) due to factors like overuse of buffered IV solutions.

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Hypotonicity

Condition where a solution has a lower concentration of solutes compared to the cell, potentially causing cells to swell.

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Citrate Binding

A process where citrate in blood products binds with calcium, potentially leading to hypocalcemia during massive transfusions.

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Colloids

Solutions containing large molecules that help retain fluid in the vascular space, including proteins like albumin.

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Albumin

A type of colloid protein solution available in different concentrations (5% and 25%) used in fluid resuscitation.

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Phenylephrine Effect

High doses increase alpha-1 vasoconstriction, raising afterload and affecting measurements.

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Frank-Starling Curve

Describes the relationship between stroke volume and end-diastolic volume in the heart.

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Expiratory Occlusion Test

A method to measure preload by stopping ventilation and assessing pulse pressure variations.

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Cardiac Output Measurement

Non-invasive methods to assess how much blood the heart pumps, including ultrasound and pleth variability index.

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Lactate Level

Indicator of reduced oxygen delivery and potentially anaerobic metabolism in tissues.

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Fluid Responsiveness Assessment

Evaluates how the heart responds to fluid administration based on cardiac output measurements.

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Pulse Wave Analysis

Technique using pulse ox to analyze blood flow and variability in heart function.

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End-Tidal CO2 Measurement

Monitoring CO2 levels in exhaled air to assess respiratory function and effectiveness.

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Cryoprecipitate (Cryo)

A blood product containing fibrinogen, required for transfusion within 4 hours after thawing.

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Fibrinogen increase

One unit of cryo can raise fibrinogen levels by 50 to 100 mg/dL, aiming for over 100 mg/dL for hemostasis.

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Platelet lifespan

Platelets live for approximately 8 to 12 days in circulation.

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Normal platelet count

The typical platelet count in blood ranges from 150,000 to 400,000 cells per microliter.

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Platelet transfusion types

Transfusions can be from pooled whole blood or single donor apheresis.

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Leukoreduction

Process of removing white blood cells from platelets to decrease immune reactions during transfusions.

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Platelet count increase per dose

Receiving a single donor apheresis pack raises platelet count by 30,000 to 50,000 cells.

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Storage temperature for platelets

Platelets are stored at 22°C, which can risk bacterial growth due to warmth.

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Sensitivity and Specificity

Ability of a monitor to accurately measure and report what it is supposed to measure.

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Clinical Picture

A comprehensive view of all clinical indicators and patient conditions.

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Respiratory Variation

Fluctuations in parameters like blood pressure due to mechanical ventilation.

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Positive Pressure Breath

A method of mechanical ventilation that increases intrathoracic pressure.

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Intrathoracic Pressure

Pressure within the thoracic cavity that affects venous return.

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Vasomotor Tone

The degree of constriction of blood vessels, affecting blood flow.

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Cardiac Function Stability

The consistency of heart performance over time.

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Tidal Volume Consistency

The maintenance of a steady volume of air delivered with each mechanical breath.

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Iron delivery

Iron is delivered to cell receptors and used for erythrocyte production.

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Hemoglobin synthesis

Increased hemoglobin production releases stored iron.

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Iron deficiency

A condition often undiagnosed, common in menstruating females.

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GI absorption issues

Bariatric surgery can impair nutrient absorption, leading to deficiencies.

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Iron deficiency anemia

A condition resulting from insufficient iron for red blood cell production.

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Blood transfusion risks

Transfusions can cause agglutination reactions due to antigens.

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Rh factor

An inherited protein on red blood cells important in transfusions.

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Red blood cell storage

Stored red blood cells undergo biochemical changes over time.

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Study Notes

Introduction

  • Lecture begins with checking for questions on the previous module's content, specifically regarding dye dosing.
  • Review of electrolytes and fluids is initiated.
  • Total body water differences in males, females, and across age groups are highlighted.
  • Intracellular and extracellular fluid compartments are discussed in terms of their relative contents of sodium, chloride, potassium, and phosphate.

Body Fluid Compartments

  • Total body water in a 70 kg person is approximately 42 liters.
  • Extracellular fluid is composed of about 80% interstitial fluid and 20% plasma.
  • Intracellular fluid is rich in potassium.
  • Extracellular fluid is rich in sodium and chloride.
  • Plasma proteins contribute to oncotic pressure.
  • The composition of fluids in various body compartments is described.

Tissue Fluid Movement

  • Substances can move freely between interstitial fluid and plasma compartments.
  • Molecules' passage through endothelial cell tight junctions, basement membrane, and glycocalyx is discussed.
  • The blood-brain barrier, lungs, and heart as examples of tight compartments with continuous endothelium are mentioned.
  • Vascular space interactions and influences, especially the role of inflammatory conditions, are touched upon.

Monitoring and Volume Status

  • Static parameters like blood pressure, heart rate, and urine output are used to assess overall volume status.
  • Limitations exist regarding the use of static monitoring during time-sensitive situations like surgery.
  • Dynamic parameters, particularly changes in pulse pressure during breathing, can help evaluate volume responsiveness.
  • Dynamic parameters are more useful in surgical patients, especially with massive blood loss.

Treatment of Fluid Imbalances

  • Treatment options for hyperkalemia (high potassium levels) include insulin and glucose (to shift potassium into cells), calcium, and bicarbonate.
  • Hypokalemia is also discussed but without details given.
  • Treatment for acidosis (low pH) is addressed but not in great detail.

Fluid Therapy

  • The choice between crystalloids and colloids in fluid therapy is mentioned.
  • Crystalloids, like normal saline or lactated ringers, are often used initially for fluid replacement, but the use of colloids, like albumin solutions, may be preferred in cases of significant blood loss or hypovolemia.
  • The need for careful monitoring, and the associated potential for complications (e.g., hypervolemia or electrolyte imbalances) is stressed, especially in hypovolemic patients.

Electrolyte Concentrations

  • Key electrolytes, including their approximate concentrations in body fluids (plasma), are discussed.
  • The difference between isotonic, hypotonic, and hypertonic solutions in relation to plasma is covered.
  • Functions of sodium and chloride in extracellular fluids and potassium in intracellular fluid are described.

Measuring Body Composition

  • Calculation and interpretation of pulse pressure variations, along with their use in assessing volume response during fluid resuscitation in an acute care setting, is demonstrated.
  • Various types and uses of solutions in relation to different medical conditions are touched upon, including the potential issues that can arise.

Discussion and Conclusion

  • An overview of various clinical scenarios, including cases with massive blood loss in surgical settings, was covered.
  • Specific types of surgical procedures and complications were discussed.

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