The primary aim of ACE inhibitors in congestive heart failure treatment is to improve which physiological parameter?

Correct Answer: A

Rationale: ACE inhibitors reduce afterload by dilating blood vessels, improving cardiac output, and reducing the heart's workload.

Correct Answer: B

Rationale: Aplastic anemia results from bone marrow failure, leading to a reduced reticulocyte count, unlike hemolytic conditions where reticulocytes are increased.

Correct Answer: B

Rationale: Anaphylactoid purpura (Henoch-Schanlein purpura) is the most common cause of non-thrombocytopenic purpura in children, characterized by a small-vessel vasculitis leading to purpuric rash, arthritis, and renal involvement.

Correct Answer: C

Rationale: Severe aortic stenosis impairs cardiac output, leading to reduced perfusion and obstructive shock, unlike conditions like myocarditis or dehydration.

Correct Answer: D

Rationale: Stage 1 hypertension in children is defined as blood pressure levels between the 95th and 99th percentile for age, height, and sex.