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Questions and Answers
Which of the following health conditions does hypertension NOT significantly increase the risk for?
Which of the following health conditions does hypertension NOT significantly increase the risk for?
Which of these factors is considered a traditional risk factor for hypertension?
Which of these factors is considered a traditional risk factor for hypertension?
What role do environmental and genetic factors play in hypertension prevalence?
What role do environmental and genetic factors play in hypertension prevalence?
Which dietary component is linked to higher prevalence of hypertension?
Which dietary component is linked to higher prevalence of hypertension?
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Which condition is NOT a form of cardiovascular disease directly associated with hypertension?
Which condition is NOT a form of cardiovascular disease directly associated with hypertension?
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What does an increase in stroke volume contribute to?
What does an increase in stroke volume contribute to?
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What effect does vasoconstriction have on blood pressure?
What effect does vasoconstriction have on blood pressure?
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How is peripheral resistance primarily determined?
How is peripheral resistance primarily determined?
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How does the sympathetic nervous system primarily influence blood pressure?
How does the sympathetic nervous system primarily influence blood pressure?
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What is the outcome of aldosterone release in the renin-angiotensin-aldosterone system?
What is the outcome of aldosterone release in the renin-angiotensin-aldosterone system?
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Which mechanism is primarily activated as a negative feedback response to high blood pressure?
Which mechanism is primarily activated as a negative feedback response to high blood pressure?
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Which mechanism is NOT directly linked to blood pressure control?
Which mechanism is NOT directly linked to blood pressure control?
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What is a primary consequence of hypertensive heart disease?
What is a primary consequence of hypertensive heart disease?
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Which condition is commonly associated with elevated blood pressure in the brain?
Which condition is commonly associated with elevated blood pressure in the brain?
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What role does the kidney play in hypertension?
What role does the kidney play in hypertension?
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Which of the following is a consequence of hypertension in the peripheral arteries?
Which of the following is a consequence of hypertension in the peripheral arteries?
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What is the most common etiology of secondary hypertension?
What is the most common etiology of secondary hypertension?
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What is the ACC/AHA threshold for defining hypertension in mmHg?
What is the ACC/AHA threshold for defining hypertension in mmHg?
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What is considered the ESC/ESH threshold for hypertension?
What is considered the ESC/ESH threshold for hypertension?
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According to the ACC/AHA guidelines, which blood pressure range is classified as elevated?
According to the ACC/AHA guidelines, which blood pressure range is classified as elevated?
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In the ESC/ESH guidelines, what is the optimal blood pressure range?
In the ESC/ESH guidelines, what is the optimal blood pressure range?
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What percentage of hypertension cases are classified as primary or essential hypertension?
What percentage of hypertension cases are classified as primary or essential hypertension?
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Which condition is the most common cause of secondary hypertension?
Which condition is the most common cause of secondary hypertension?
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Which of the following is NOT a known adrenal cause of secondary hypertension?
Which of the following is NOT a known adrenal cause of secondary hypertension?
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Which type of hypertension is primarily influenced by lifestyle factors and genetics?
Which type of hypertension is primarily influenced by lifestyle factors and genetics?
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Which of the following conditions is associated with renovascular causes of secondary hypertension?
Which of the following conditions is associated with renovascular causes of secondary hypertension?
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Which condition can contribute to hypertension due to sympathetic overactivity in obese patients?
Which condition can contribute to hypertension due to sympathetic overactivity in obese patients?
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What endocrine disorder is known to potentially lead to hypertension?
What endocrine disorder is known to potentially lead to hypertension?
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Which medication type is associated with increased risk of hypertension at high doses?
Which medication type is associated with increased risk of hypertension at high doses?
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Which condition is specifically related to hypertension during pregnancy?
Which condition is specifically related to hypertension during pregnancy?
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Which neurogenic condition could lead to secondary hypertension?
Which neurogenic condition could lead to secondary hypertension?
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Which of the following is a commonly assessed factor in the history of hypertension?
Which of the following is a commonly assessed factor in the history of hypertension?
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Which lifestyle factor is recognized as a risk factor for hypertension?
Which lifestyle factor is recognized as a risk factor for hypertension?
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Which laboratory test is essential for initial renal evaluation in patients?
Which laboratory test is essential for initial renal evaluation in patients?
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What does the funduscopic examination of the retina assess in hypertensive patients?
What does the funduscopic examination of the retina assess in hypertensive patients?
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Which of the following tests evaluates metabolic status in a patient?
Which of the following tests evaluates metabolic status in a patient?
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What is a primary focus of the basic endocrine laboratory tests during evaluation?
What is a primary focus of the basic endocrine laboratory tests during evaluation?
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Which measurement is included in the basic metabolic laboratory tests?
Which measurement is included in the basic metabolic laboratory tests?
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What is the recommended blood pressure (BP) target for adults over 60 years old without diabetes?
What is the recommended blood pressure (BP) target for adults over 60 years old without diabetes?
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For adults under 60 years old with diabetes, what is the optimal blood pressure target?
For adults under 60 years old with diabetes, what is the optimal blood pressure target?
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Which group of patients should have their blood pressure maintained below 140/90?
Which group of patients should have their blood pressure maintained below 140/90?
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What is a recommended lifestyle modification for managing hypertension?
What is a recommended lifestyle modification for managing hypertension?
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What should be done for adults with hypertension who have not reached their BP target after initial treatment?
What should be done for adults with hypertension who have not reached their BP target after initial treatment?
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Which of the following describes the renal vasculature?
Which of the following describes the renal vasculature?
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Which category does macrovascular disease belong to?
Which category does macrovascular disease belong to?
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What is a common indication that increased urinary albumin excretion may occur?
What is a common indication that increased urinary albumin excretion may occur?
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What demographic is most commonly affected by fibromuscular dysplasia (FMD)?
What demographic is most commonly affected by fibromuscular dysplasia (FMD)?
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Which condition is often associated with cholesterol crystals lodging in micro vessels?
Which condition is often associated with cholesterol crystals lodging in micro vessels?
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What is the relationship between age and atherosclerotic renal artery stenosis (ARAS)?
What is the relationship between age and atherosclerotic renal artery stenosis (ARAS)?
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Which characterized lesion is a hallmark of renovascular disease due to malignant hypertension?
Which characterized lesion is a hallmark of renovascular disease due to malignant hypertension?
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What is defined as pulmonary hypertension in terms of mean pulmonary artery pressure?
What is defined as pulmonary hypertension in terms of mean pulmonary artery pressure?
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Which term describes the thickening of vascular walls and narrowing of lumina due to hypertensive nephrosclerosis?
Which term describes the thickening of vascular walls and narrowing of lumina due to hypertensive nephrosclerosis?
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What is the most important initial screening test for pulmonary arterial hypertension (PAH)?
What is the most important initial screening test for pulmonary arterial hypertension (PAH)?
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Which test is considered the gold standard for diagnosing and assessing the severity of PAH?
Which test is considered the gold standard for diagnosing and assessing the severity of PAH?
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What may help to identify true physiological limitations in patients experiencing dyspnea?
What may help to identify true physiological limitations in patients experiencing dyspnea?
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Which imaging technique can show signs of venous congestion in patients with pulmonary issues?
Which imaging technique can show signs of venous congestion in patients with pulmonary issues?
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What sign might chest imaging reveal in patients with pulmonary hypertension?
What sign might chest imaging reveal in patients with pulmonary hypertension?
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What test is considered the gold standard for diagnosing pulmonary hypertension (PH)?
What test is considered the gold standard for diagnosing pulmonary hypertension (PH)?
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Which pulmonary function test finding is typically classic in pulmonary arterial hypertension (PAH)?
Which pulmonary function test finding is typically classic in pulmonary arterial hypertension (PAH)?
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Which of the following is preferred for vasodilator testing in pulmonary hypertension diagnosis?
Which of the following is preferred for vasodilator testing in pulmonary hypertension diagnosis?
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Which imaging technique has high sensitivity for screening acute thromboembolic disease?
Which imaging technique has high sensitivity for screening acute thromboembolic disease?
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What type of lung disease may pulmonary function tests suggest if dyspnea is present in PAH?
What type of lung disease may pulmonary function tests suggest if dyspnea is present in PAH?
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Which type of imaging is often used to qualify patients for surgical intervention in PAH?
Which type of imaging is often used to qualify patients for surgical intervention in PAH?
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Study Notes
Hypertension and Cardiovascular Diseases
- Hypertension significantly increases the risk of developing cardiovascular diseases, doubling the likelihood.
- Affected conditions include:
- Coronary Heart Disease (CHD): A blockage of the coronary arteries.
- Congestive Heart Failure (CHF): The heart's inability to pump sufficient blood.
- Ischemic Stroke: Caused by a clot preventing blood flow to the brain.
- Hemorrhagic Stroke: Resulting from a blood vessel rupture in the brain.
- Renal Failure: Impaired kidney function leading to waste accumulation.
- Peripheral Arterial Disease (PAD): Narrowing of peripheral arteries, often in the legs.
Contributing Factors to Hypertension
- Both environmental and genetic factors influence the prevalence of hypertension, leading to regional and racial differences.
- Traditional risk factors include:
- Obesity and Weight Gain: Increased body fat raises blood pressure.
- Dietary NaCl Intake: High salt consumption is linked to hypertension.
- Low Dietary Calcium and Potassium: Deficiencies in these minerals can contribute to elevated blood pressure.
- Alcohol Consumption: Excessive drinking can adversely affect blood pressure levels.
- Psychosocial Stress: Chronic stress can lead to temporary spikes and long-term elevation in blood pressure.
- Low Levels of Physical Activity: Sedentary lifestyle is correlated with increased hypertension risk.
Mechanisms of Hypertension
- Blood flow depends on pressure across the vascular bed and resistance.
- Increased vascular volume can elevate blood pressure due to an increase in cardiac output.
Determinants of Arterial Pressure
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Cardiac Output: Calculated as stroke volume (SV) multiplied by heart rate (HR).
- Increased SV, blood volume, or HR leads to higher cardiac output, raising arterial pressure.
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Peripheral Resistance: Influenced by vascular structure and function.
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Vasoconstriction:
- Raises peripheral resistance, resulting in increased diastolic blood pressure.
- A minimal decrease in lumen size (10% reduction) leads to a significant BP increase (4 times).
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Vasodilation:
- Lowers peripheral resistance, which decreases diastolic blood pressure.
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Vasoconstriction:
Mechanisms of Blood Pressure Control
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Intravascular Volume: Increased sodium (Na) levels lead to higher water (H2O) retention, which subsequently raises cardiac output (CO) and blood pressure (BP).
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Autonomic Nervous System:
- Sympathetic Nervous System: Activates processes that increase BP.
- Parasympathetic Nervous System: Generally reduces BP.
- Alpha-1 Adrenergic Receptors: Mediate vasoconstriction, contributing to elevated BP.
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Renin-Angiotensin-Aldosterone System (RAAS):
- A decrease in BP triggers renin release from the kidneys.
- Renin converts angiotensinogen (produced in the liver) into angiotensin I.
- Angiotensin I is converted into angiotensin II by the angiotensin-converting enzyme (ACE) in the lungs.
- Angiotensin II causes vasoconstriction and stimulates aldosterone release, enhancing sodium (Na) and water (H2O) reabsorption, leading to increased BP.
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Local and Regional Mechanisms: Blood pressure can be influenced by local tissue demands and responses.
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Vascular Mechanisms: Blood vessels can constrict or dilate in response to changes in BP; increased stretch in the aorta from high BP activates baroreceptors, which signal the brain to induce vasodilation as a negative feedback mechanism to lower BP.
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Immune Mechanisms: Factors such as inflammation and oxidative stress can affect blood pressure regulation by altering vascular function and responsiveness.
Heart Consequences
- Hypertensive heart disease results from structural and functional adaptations due to persistent high blood pressure.
- Left Ventricular Hypertrophy (LVH) is a major adaptation resulting from increased workload on the heart.
- Congestive Heart Failure (CHF) can develop as the heart's ability to pump effectively is compromised.
- Atherosclerotic Coronary Artery Disease (CAD) is exacerbated by hypertension, leading to heart attack risk.
- Microvascular disease affects small blood vessels, contributing to heart dysfunction and complications.
- Cardiac arrhythmias, including atrial fibrillation (A-fib), can arise as a result of structural heart changes.
Brain Consequences
- Elevated blood pressure is a significant risk factor for the occurrence of stroke.
- Hypertension may lead to cognitive decline, increasing the risk of dementia in older adults.
Kidney Consequences
- The kidneys are both a target organ affected by hypertension and a contributing factor to its onset.
- Primary renal disease is the most frequent cause of secondary hypertension, highlighting the interrelationship between kidney function and blood pressure regulation.
Peripheral Arteries Consequences
- Peripheral Artery Disease (PAD) develops as a consequence of hypertension, leading to reduced blood flow to the extremities and associated complications.
Defining Hypertension
- Hypertension is classified differently by various health organizations, with specific pressure thresholds defining its presence.
Comparison of ACC/AHA and ESC/ESH Pressure Thresholds
- ACC/AHA defines hypertension as blood pressure readings of 130/80 mmHg or higher.
- ESC/ESH sets a higher threshold, defining hypertension as readings of 140/90 mmHg or more.
- These differing definitions can lead to variations in diagnosis and treatment strategies across regions and practices.
Primary/Essential Hypertension
- Accounts for 80-95% of hypertension cases.
- Etiology involves a combination of genetic predispositions and lifestyle factors.
- Represents a complex interplay between inherited traits and environmental influences.
Secondary Causes of Hypertension
- Secondary hypertension arises from identifiable underlying conditions and can affect both systolic and diastolic blood pressure.
Renal Causes
- The most common cause of secondary hypertension.
- Includes conditions like obstructive uropathy and parenchymal diseases.
Renovascular Causes
- Characterized by conditions such as arteriosclerotic changes and fibromuscular dysplasia.
- These affect renal blood flow and can lead to increased blood pressure.
Adrenal Causes
- Conditions like primary aldosteronism and Cushing's syndrome contribute to secondary hypertension.
- 17α-hydroxylase deficiency affects steroid hormone production and can influence blood pressure.
Aortic Coarctation
- A structural heart defect that can lead to elevated blood pressure due to narrowed aorta.
Secondary Causes of Systolic and Diastolic Hypertension
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Obstructive Sleep Apnea: Found commonly in obese individuals; leads to hypertension due to sympathetic nervous system overactivity.
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Preeclampsia/Eclampsia: Pregnancy-related condition characterized by hypertension and potential seizures, posing risks to both mother and fetus.
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Neurogenic Causes: Include various conditions affecting the nervous system such as:
- Psychogenic Factors: Stress and anxiety leading to heightened blood pressure.
- Diencephalic Syndrome: Disorders affecting the diencephalon, influencing blood pressure regulation.
- Familial Dysautonomia: Genetic disorder affecting autonomic nerve function and blood pressure control.
- Acute Increased Intracranial Pressure (ICP): Elevated pressure within the skull impacting cardiovascular regulation.
- Acute Spinal Cord Section: Sudden injury to the spinal cord, potentially affecting autonomic functions and resulting in hypertension.
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Miscellaneous Endocrine Disorders: Various imbalances that can result in hypertensive states including:
- Hypothyroidism: Underactive thyroid leading to increased peripheral vascular resistance.
- Hyperthyroidism: Overactive thyroid causing increased cardiac output and blood pressure.
- Hypercalcemia: Elevated calcium levels affecting vascular tone and renal function, contributing to hypertension.
- Acromegaly: Excess growth hormone leading to hypertension due to vascular and metabolic changes.
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Medications: Certain drugs associated with increased blood pressure, such as:
- High-Dose Estrogens: Used in some hormonal therapies; can raise blood pressure.
- Adrenal Steroids: Corticosteroids that may cause fluid retention and increased blood pressure.
- Decongestants: Specifically those containing phenylpropanolamine can lead to vasoconstriction.
- Appetite Suppressants: Medications that might elevate blood pressure as a side effect.
Approach to Hypertension
History
- Document the duration of hypertension to assess chronicity and treatment needs.
- Review previous therapies to understand patient response and adherence.
Family History
- Investigate family history of hypertension (HTN) and cardiovascular disease (CVD) for genetic predispositions.
Dietary and Psychosocial History
- Consider dietary habits and psychosocial factors that may impact hypertension management.
Other Risk Factors
- Monitor for weight changes, which can indicate dietary and lifestyle factors affecting BP.
- Assess dyslipidemia as it can contribute to cardiovascular risk.
- Determine smoking status, as tobacco use elevates blood pressure.
- Evaluate diabetes management, given its association with complications in hypertension.
- Analyze levels of physical inactivity, which are linked to higher hypertension risk.
Evidence of 2° Hypertension
- Identify history of renal disease that could indicate secondary causes of hypertension.
- Note any changes in appearance, which may suggest conditions like Cushing's syndrome.
- Recognize muscle weakness as a potential sign of electrolyte imbalances or other conditions.
- Explore symptoms like sweating, palpitations, and tremor that may indicate catecholamine-secreting tumors.
- Observe erratic sleep patterns, snoring, and daytime somnolence, which suggest possible sleep apnea.
- Monitor for symptoms consistent with hypo/hyperthyroidism that could influence blood pressure.
- Review current medication use, as some agents can elevate blood pressure.
Evidence of Target Organ Damage
- Assess for a history of transient ischemic attacks (TIA) or strokes, indicating acute neurological compromise.
- Monitor for angina or myocardial infarction, key indicators of coronary artery involvement.
- Evaluate for symptoms of congestive heart failure as a result of prolonged hypertension.
- Investigate sexual dysfunction, as it may reflect vascular health issues stemming from hypertension.
Other Comorbidities
- Consider the presence of endocrine disorders, which often coexist and complicate hypertension management.
Physical Examination
- Assess body habitus to determine if the patient is obese.
- Measure blood pressure in both arms to check for discrepancies.
- Conduct a funduscopic examination of the retina to identify potential target organ damage.
Basic Laboratory Tests for Initial Evaluation
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Renal Evaluation:
- Perform microscopic urinalysis as a crucial diagnostic step.
- Measure albumin excretion to assess renal damage.
- Check serum BUN (Blood Urea Nitrogen) and/or creatinine levels to evaluate kidney function.
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Endocrine Evaluation:
- Measure serum levels of sodium, potassium, calcium, and TSH (Thyroid-Stimulating Hormone) to assess endocrine function.
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Metabolic Evaluation:
- Conduct fasting blood glucose test to evaluate glucose metabolism.
- Analyze lipid profile including total cholesterol, HDL (High-Density Lipoprotein), LDL (Low-Density Lipoprotein, often calculated), and triglycerides for cardiovascular risk assessment.
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Other Tests:
- Assess hematocrit to evaluate red blood cell concentration.
- Perform electrocardiogram (ECG) to monitor heart rhythm and detect cardiovascular issues.
Treatment Algorithm for Hypertension
- Lifestyle modifications are recommended as the first step for adults over 18 with hypertension.
- For patients without diabetes:
- Adults over 60 years should aim for blood pressure (BP) below 150/90 mmHg.
- For patients with diabetes:
- Recommended BP target is below 140/90 mmHg, regardless of age.
Renovascular Disease
- The renal vasculature features a complex structure with abundant arteriolar blood flow to the cortex, exceeding metabolic needs, highlighting its role as a filtering organ.
- Vascular disorders significantly disrupt the blood supply to the kidneys, impacting renal function.
Urinary Albumin Excretion (UAE)
- Rates of Urinary Albumin Excretion serve as predictors for systemic atherosclerotic disease events.
- Elevated UAE can occur years prior to the onset of cardiovascular events, indicating early renal damage and systemic implications.
Examples of Renovascular Diseases
- Macrovacular disease: Involves large blood vessel pathology, often related to atherosclerosis and significantly affects renal blood flow.
- Microvascular disease: Involves smaller blood vessels leading to renal ischemia and can contribute to hypertension and kidney failure.
Macrovascular Disease Overview
- Large-vessel renal artery occlusive disease significantly impacts renal function and blood pressure regulation.
Fibromuscular Dysplasia (FMD)
- Commonly affects women aged 15-50 and can lead to hypertension.
- Generally does not compromise kidney function; however, it may cause total occlusion.
- Associated with the formation of renal artery aneurysms.
Atherosclerotic Renal Artery Stenosis (ARAS)
- Prevalence increases with age, notably in patients with existing vascular diseases.
- Observed in 18-23% of patients with coronary artery disease.
- More than 30% prevalence in individuals with peripheral aortic or lower extremity disease.
Diagnostic Techniques
- Intra-arterial angiography is the gold standard for diagnosing large vessel diseases.
Atheroembolic Renal Disease
- Often results from cholesterol crystals detached from atherosclerotic plaques.
- These crystals block downstream micro vessels, leading to renal complications.
Microvascular Injury Associated with Hypertension
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Malignant Hypertension:
- Characterized by "fibrinoid necrosis" leading to vessel wall breakdown.
- "Onion skin" lesions are commonly observed, particularly in renovascular diseases linked to Malignant Hypertension.
-
Hypertensive Nephrosclerosis:
- Pathological findings often show thickening of afferent arterioles.
- Presence of homogeneous eosinophilic material indicates Hyaline arteriosclerosis.
- This condition results in the narrowing of vascular lumina.
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Pulmonary Hypertension:
- Defined by elevated pulmonary artery pressures:
- Mean pulmonary artery pressure exceeds 22 mmHg.
- Estimated systolic pulmonary artery pressure above 36 mmHg.
- Pulmonary arterial hypertension (PAH) is a specific, less common form of pulmonary hypertension.
- Symptoms of PAH include dyspnea, chest pain, and syncope.
- Defined by elevated pulmonary artery pressures:
Diagnosis and Classification of Pulmonary Arterial Hypertension (PAH)
- Early stages of PAH often present with non-specific physical examination findings.
- Echocardiogram with bubble study is the primary initial screening test; crucial for identifying PAH.
- Invasive hemodynamic monitoring serves as the gold standard for diagnosing and measuring disease severity.
- Cardiopulmonary Exercise Test may be conducted if the patient has adequate functional capacity; helps distinguish true physiological limitations and differentiate between cardiac and pulmonary causes of dyspnea.
Imaging Techniques in PAH Diagnosis
-
Chest imaging and lung function tests can show evidence of pulmonary hypertension (PH) such as:
- Enlargement of central pulmonary arteries.
- “Vascular pruning,” indicative of vascular changes.
- Cardiomegaly, or enlargement of the heart.
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High-resolution CT scans may reveal venous congestion signs, including:
- Centrilobular ground-glass infiltrate.
- Thickened septal lines.
Diagnosis and Classification of PAH
- Early-phase Physical Exam: Often reveals no significant findings in patients with Pulmonary Arterial Hypertension (PAH).
- CT Angiograms: Widely utilized for assessing acute thromboembolic disease; recognized for high sensitivity and specificity.
- Ventilation-Perfusion (V/Q) Scanning: Effective screening method due to its high sensitivity, plays a crucial role in determining eligibility for surgical interventions.
- Pulmonary Function Tests: Essential for comprehensive evaluation; an isolated decrease in Diffusing Capacity of the Lungs for Carbon Monoxide (DLCO) is a classic indicator of PAH.
- Lung Function Results: May imply the presence of restrictive or obstructive lung diseases contributing to symptoms of dyspnea or pulmonary hypertension (PH).
- Right Heart Catheterization (RHC): Considered the gold standard for diagnosing PH and assists in selecting suitable medical therapies.
- Vasodilator Testing: Conducted during RHC; short-acting vasodilators like inhaled Nitric Oxide (NO) and inhaled Epoprostenol are preferred for this testing process.
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Description
This quiz covers the relationship between hypertension and various cardiovascular diseases, including coronary heart disease and stroke. It also explores traditional risk factors such as obesity and dietary sodium intake. Test your knowledge on how these factors contribute to hypertension prevalence.