A 25-year-old female presents with fever, malaise, headaches, and muscle pain (myalgia). A chest x-ray reveals bilateral infiltrates. The patient's blood test for cold agglutinins came positive. This patient's illness is most likely due to infection with

Correct Answer: B

Rationale: Mycoplasma pneumoniae causes atypical pneumonia with bilateral infiltrates, systemic symptoms, and positive cold agglutinins due to IgM autoantibodies.

Correct Answer: C

Rationale: Grapefruit juice interacts with amiodarone and can increase its toxicity.

Correct Answer: C

Rationale: New dyspnea may indicate pulmonary toxicity, a serious adverse effect of amiodarone requiring immediate attention.

Correct Answer: A

Rationale: Dobutamine can cause tachycardia and dysrhythmias, requires weight-based titration, and should be given via a central line due to incompatibilities.

Correct Answer: C

Rationale: The left ventricle has the thickest muscular wall to pump blood against the high pressure of the systemic circulation.