COMAT COMAT Pathophysiology and Disease Processes

Question 1

Which mechanism best explains the pain of angina pectoris in coronary artery disease?

Accepted Answer

Ischemia-induced accumulation of metabolites stimulating cardiac nociceptors

Answer

Myocardial ischemia causes metabolite accumulation (adenosine, lactate, H+) that stimulates cardiac sympathetic afferents, producing the characteristic chest pain of angina.

Question 2

Type 2 diabetes mellitus is primarily characterized by which underlying pathophysiologic mechanism?

Accepted Answer

Peripheral insulin resistance with relative insulin deficiency

Answer

Type 2 DM involves peripheral tissue insulin resistance (especially muscle and liver) combined with progressive beta cell dysfunction leading to relative insulin deficiency.

Question 3

A patient with COPD has a PaCO2 of 55 mmHg chronically — which acid-base disorder is present?

Accepted Answer

Chronic respiratory acidosis with metabolic compensation

Answer

Chronic CO2 retention in COPD leads to respiratory acidosis with compensatory renal bicarbonate retention, resulting in a near-normal pH (chronic respiratory acidosis).

Question 4

The pathophysiology of nephrotic syndrome involves loss of which glomerular barrier property?

Accepted Answer

Charge selectivity allowing albumin to cross the GBM

Answer

Nephrotic syndrome results from loss of the glomerular basement membrane's negative charge barrier, permitting albumin (normally repelled) to pass into the filtrate.

Question 5

Which cytokine is primarily responsible for the fever response during acute systemic infection?

Accepted Answer

IL-1β

Answer

IL-1β (along with IL-6 and TNF-α) is an endogenous pyrogen that acts on the hypothalamus to raise the thermoregulatory set point, producing fever.

COMAT - Comprehensive Osteopathic Medical Achievement Test Practice Test

COMAT - Comprehensive Osteopathic Medical Achievement Test Practice Test

COMAT COMAT Pathophysiology and Disease Processes