ACSM-EP Pathophysiology 4

Question 1

Which pathophysiological change in obesity most directly impairs VO2max?

Accepted Answer

Excess adipose tissue increasing metabolic demand relative to lean mass

Answer

Obese individuals carry non-metabolically active mass, so their VO2max expressed per kilogram of total body weight is lower than lean-mass-normalized values.

Question 2

A 58-year-old post-myocardial infarction patient shows ST-segment depression at 5 METs during a graded exercise test. This finding most likely indicates:

Accepted Answer

Residual myocardial ischemia in viable tissue beyond the infarct zone

Answer

ST depression during exercise typically reflects subendocardial ischemia from inadequate coronary perfusion in myocardium supplied by stenotic vessels.

Question 3

In chronic kidney disease (CKD), which mechanism contributes most to exercise intolerance?

Accepted Answer

Anemia from reduced erythropoietin synthesis combined with uremic myopathy

Answer

CKD reduces renal erythropoietin production causing anemia, and uremic toxins impair skeletal muscle function, together severely limiting aerobic capacity.

Question 4

Which pathological process differentiates stable angina from unstable angina?

Accepted Answer

Unstable angina involves plaque rupture or erosion with dynamic thrombus formation at rest

Answer

Unstable angina results from acute plaque rupture or erosion triggering platelet aggregation and thrombus formation, reducing coronary flow without complete occlusion.

Question 5

A patient with Parkinson's disease presents with shuffling gait and bradykinesia. The underlying neuropathological mechanism is:

Accepted Answer

Dopaminergic neuron loss in the substantia nigra impairing basal ganglia motor control

Answer

Loss of dopamine-producing neurons in the substantia nigra disrupts the basal ganglia circuitry that facilitates smooth, voluntary movement initiation.

ACSM Practice Test

ACSM Practice Test

ACSM-EP Pathophysiology 4