Which signs indicate possible postoperative myocardial infarction after noncardiac surgery?

• A. Chest pain
• B. New ECG changes
• C. Troponin elevation
• D. Hemodynamic instability

Answer: (D)

Postoperative myocardial infarction often presents with signs of compromised perfusion rather than classic chest pain alone. The clearest, most urgent signal in the immediately post-surgical period is hemodynamic instability—such as sudden hypotension, tachycardia, arrhythmias, cool clammy skin, or altered mental status—which points to a possible acute coronary event affecting the heart’s pumping ability. In a patient who recently had noncardiac surgery, chest pain may be blunted or obscured by analgesia, and new ECG changes or troponin elevations can be influenced by other perioperative factors (electrolyte shifts, baseline abnormalities, sepsis, or nonischemic injury). While chest pain, ECG changes, and troponin rise are important clues, they are not as immediately actionable as a drop in perfusion or unstable hemodynamics. When instability occurs, it should prompt urgent evaluation for MI and rapid initiation of appropriate management.