MD - Doctor of Medicine Cardiovascular System Pathophysiology Questions and Answers

Question 1

A 65-year-old male with a history of hypertension and hyperlipidemia presents for a routine check-up.
He is asymptomatic.
In the context of atherosclerotic cardiovascular disease, which of the following is considered the primary initiating event in the formation of an atheromatous plaque?

Accepted Answer

Endothelial dysfunction and increased permeability

Answer

Platelet aggregation and thrombus formation

Answer

Smooth muscle cell proliferation into the intima

Answer

Calcification of the medial layer of the artery

Question 2

A 72-year-old female with chronic systolic heart failure has persistently elevated activity of the Renin-Angiotensin-Aldosterone System (RAAS). Which of the following is a direct pathophysiological consequence of increased Angiotensin II levels in this patient?

Accepted Answer

Potent vasoconstriction and stimulation of aldosterone release

Answer

Decreased systemic vascular resistance

Answer

Increased natriuresis and diuresis

Answer

Inhibition of cardiac myocyte hypertrophy

Question 3

A 58-year-old male presents to the emergency department with severe, crushing substernal chest pain. An ECG is performed. Which of the following ECG findings is most indicative of an acute ST-segment elevation myocardial infarction (STEMI) resulting from a transmural ischemic injury?

Accepted Answer

New ST-segment elevation at the J-point in two or more contiguous leads

Answer

Pathological Q waves in leads V1-V4

Answer

T-wave inversion in the inferior leads (II, III, aVF)

Answer

ST-segment depression in leads V5-V6

Question 4

An 80-year-old patient is diagnosed with severe, calcific aortic stenosis. From a pathophysiological standpoint, what is the primary hemodynamic burden placed on the left ventricle as a result of this condition?

Accepted Answer

Pressure overload

Answer

Volume overload

Answer

Decreased preload

Answer

Decreased contractility

Question 5

A 45-year-old patient in the ICU develops septic shock secondary to pneumonia. Which of the following best describes the primary cardiovascular pathophysiology of this condition?

Accepted Answer

Distributive shock from profound systemic vasodilation

Answer

Cardiogenic shock due to direct myocardial suppression

Answer

Hypovolemic shock from capillary leak syndrome

Answer

Obstructive shock due to pulmonary emboli

Question 6

A patient with hypertension is prescribed an ACE inhibitor. Which of the following describes the primary mechanism by which this class of drugs exerts its antihypertensive effect?

Accepted Answer

Preventing the breakdown of bradykinin and reducing angiotensin II formation

Answer

Blocking beta-adrenergic receptors in the myocardium

Answer

Increasing the conversion of angiotensin I to angiotensin II

Answer

Promoting the release of aldosterone from the adrenal cortex