Which of the following is NOT typically considered an indication for Percutaneous Coronary Intervention (PCI)?

Rationale:

A. Second degree heart block is incorrect because this type of heart block is less common after coronary artery bypass grafting (CABG). While conduction disturbances can occur, they are not the most frequent dysrhythmias in the postoperative period.

B. Atrial fibrillation or flutter is correct because AF or atrial flutter is the most common postoperative dysrhythmia after open-heart surgery, particularly CABG. Factors such as atrial inflammation, electrolyte imbalances, increased sympathetic activity, and fluid shifts contribute to the development of atrial arrhythmias. These can occur within the first few days postoperatively and require monitoring due to the risk of hemodynamic instability and thromboembolism.

C. Premature junctional contractions are incorrect because these are less frequent and generally less clinically significant in the postoperative CABG population. They may occur but do not represent the most common dysrhythmia.

D. Ventricular ectopy is incorrect because although PVCs or other ventricular arrhythmias may appear after surgery, they are not as common as atrial fibrillation or flutter. Ventricular arrhythmias are more concerning if sustained but occur less frequently post-CABG.

Rationale:
A. Administration of naloxone is incorrect because naloxone is an opioid antagonist used for opioid overdose, not for AMI. It has no role in managing myocardial ischemia.

B. Administration of aspirin is correct because aspirin inhibits platelet aggregation, reducing further clot formation in a coronary artery. Early administration of aspirin in suspected AMI improves outcomes and reduces mortality.

C. Oxygen therapy is correct because oxygen is given to increase oxygen delivery to ischemic myocardium, particularly in patients who are hypoxic, have dyspnea, or show signs of heart failure. Routine oxygen is reserved for patients with SpO₂ < 94%, per current guidelines.

D. Administration of morphine is correct because morphine relieves severe chest pain and reduces sympathetic stimulation, which can decrease myocardial oxygen demand. Morphine also helps alleviate anxiety associated with AMI.

E. Dopamine infusion is incorrect as a first-line intervention for AMI unless the patient has hemodynamic instability such as hypotension with poor perfusion. Dopamine is a vasopressor and inotrope, not routinely indicated for stable AMI management.

F. Administration of nitroglycerin is correct because nitroglycerin dilates coronary arteries, improving myocardial perfusion and reducing ischemic chest pain. It also reduces preload and myocardial oxygen demand. Care is needed in patients with hypotension or right ventricular infarction.