64-year-old man with dyspnea, shock, and a new murmur
A 64-year-old man is brought to the emergency department 4 days after an anterior ST-segment elevation myocardial infarction treated with primary PCI to the proximal LAD. He now has sudden dyspnea and lightheadedness. Blood pressure is 82/58 mm Hg, pulse is 118/min, and oxygen saturation is 90% on room air. Examination shows cool extremities, bibasilar crackles, and a new harsh holosystolic murmur best heard at the left lower sternal border with a palpable thrill. Bedside chest radiograph shows pulmonary edema. Which of the following is the most appropriate next step in management?
See the answer and explanation below:
Post-Call Recovery Reads
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B
Explanation
Clinical Pearl:
A new loud systolic murmur with shock and pulmonary edema several days after myocardial infarction should prompt immediate evaluation for mechanical complications, especially ventricular septal rupture or papillary muscle rupture. These require urgent echocardiographic confirmation and rapid surgical management.
Explanation:
This patient has cardiogenic shock 4 days after a large anterior myocardial infarction with a new harsh holosystolic murmur and palpable thrill at the left lower sternal border, which is classic for post-MI ventricular septal rupture. Current practice is immediate transthoracic echocardiography to define the lesion and urgent surgical repair, with temporary hemodynamic support as needed, because mortality is extremely high without prompt intervention. Intravenous metoprolol is inappropriate in shock and would worsen hypotension. Colchicine and aspirin would fit postinfarction pericarditis, which causes pleuritic chest pain and a friction rub, not this murmur with pulmonary edema and shock. Delayed elective angiography misses a mechanical emergency that needs action now. Intravenous fluids are used selectively in right ventricular infarction with clear lungs, whereas this patient has crackles and pulmonary edema, so fluids would likely worsen respiratory failure.
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