Acute laryngotracheobronchitis is associated with which radiological sign?

Correct Answer: C

Rationale: The steeple sign is a characteristic radiologic feature of croup (acute laryngotracheobronchitis).

Correct Answer: B

Rationale: Symptoms of RDS typically peak within 24-48 hours, not 7 days. The other statements are true regarding RDS.

Correct Answer: D

Rationale: Digitalis is used to manage chronic cardiac conditions but is not a first-line drug in resuscitation.

Correct Answer: A

Rationale: Dilated cardiomyopathy results in impaired contractility, leading to heart failure and chamber dilation.

Correct Answer: B

Rationale: Positive end-expiratory pressure (PEEP) helps maintain alveolar expansion, reducing barotrauma (damage due to high pressures in the lungs) during mechanical ventilation.