All the following are components of cold water shock resulting from immersion in cold water EXCEPT:

Correct Answer: C

Rationale: Hypoventilation, decreased breath-holding ability, ectopic beats, and supraventricular tachycardia (SVT) are part of the physiological response to cold water immersion, but hypertension is not typically a component of cold water shock.

Correct Answer: D

Rationale: Heart failure is not a common feature of TOF due to the obstructed right ventricular outflow, which limits pulmonary overcirculation.

Correct Answer: C

Rationale: Patent ductus arteriosus (PDA) is common in preterm infants due to failure of ductal closure. It presents with a continuous murmur, widened pulse pressure, and bounding pulses. Treatment includes NSAIDs or surgical ligation.

Correct Answer: A

Rationale: Serious illness often leads to hypotension rather than hypertension due to shock or cardiac dysfunction.

Correct Answer: C

Rationale: Penicillin is the most frequently implicated drug in serum sickness-like reactions.