Combined Catastrophe After Acute Myocardial Infarction

Area of Science:

• Cardiology
• Cardiac Surgery
• Medical Imaging

Background:

• ST-segment elevation myocardial infarction (MI) can lead to acute mechanical complications.
• Percutaneous coronary intervention is a common treatment for MI.
• Right ventricular (RV) involvement following MI requires careful evaluation.

Observation:

• A 47-year-old man with inferior wall ST-segment elevation MI developed an unusual finding on echocardiogram two days post-intervention.
• The echocardiogram revealed a structure resembling a second ventricular chamber within the right ventricle.
• This was identified as a left ventricular pseudoaneurysm dissecting into the RV and rupturing into its cavity.

Findings:

• The pseudoaneurysm caused a left-to-right shunt, mimicking a ventricular septal defect.
• The patient underwent successful surgical repair of the pseudoaneurysm and associated defects.
• This case illustrates a bimodal presentation pattern of acute mechanical complications post-MI, occurring early (1-2 days) or later (around 5 days).

Implications:

• Accurate and timely echocardiogram interpretation is crucial for diagnosing complex mechanical complications after MI.
• Recognition of unusual RV findings post-MI is essential for appropriate management.
• This case underscores the potential for diverse and delayed presentations of post-MI cardiac emergencies.