A 71-year-old man is evaluated in the cardiac intensive care unit for sudden-onset severe … — USMLE Step 2 CK

A 71-year-old man is evaluated in the cardiac intensive care unit for sudden-onset severe dyspnea and worsening confusion. He was admitted 4 days ago for a late-presenting anterior ST-segment elevation myocardial infarction that was treated with delayed percutaneous coronary intervention. His temperature is $37.1^\circ\text{C}$ ( $98.8^\circ\text{F}$ ), blood pressure is $76/40\text{ mm Hg}$ , pulse is $122/\text{min}$ , and respirations are $28/\text{min}$ . Pulse oximetry shows $84\%$ on room air. Physical examination reveals cold, clammy extremities, distended neck veins, and diffuse bilateral pulmonary crackles. Cardiac auscultation demonstrates a new, loud, harsh holosystolic murmur that is heard best at the left lower sternal border, accompanied by a palpable thrill. Bedside echocardiography confirms a left-to-right intracardiac shunt. Which of the following is the most appropriate definitive management for this patient's current condition?

Emergency surgical septal repairCevap
B
Intravenous bronchodilators and glucocorticoids
C
Computed tomography angiography of the chest
D
Medical management with continuous diuretic infusion
E
Empiric intravenous broad-spectrum antibiotics

Cevap

Emergency surgical septal repair

This patient presents with a classic ventricular septal rupture (VSR), a life-threatening mechanical complication that typically occurs 3 to 5 days following an anterior or apical myocardial infarction. The hallmark of VSR is acute hemodynamic deterioration (cardiogenic shock) accompanied by a new, loud, harsh holosystolic murmur and a palpable thrill at the left lower sternal border. Echocardiography confirms the left-to-right shunt, which causes right ventricular volume overload, decreased left ventricular forward flow, and subsequent pulmonary edema. The definitive treatment for a post-infarction VSR is emergency surgical septal repair by a cardiothoracic surgeon. While temporizing measures such as intra-aortic balloon counterpulsation (IABP) and inotropes can be used to stabilize the patient temporarily, urgent surgical intervention is absolutely necessary for survival.

Adım Adım Çözüm

Identify the complication based on the clinical presentation.

The patient developed cardiogenic shock 4 days post-MI, presenting with a new holosystolic murmur at the left lower sternal border and a palpable thrill, which indicates a ventricular septal rupture (VSR).

Timing (3-5 days post-MI) and physical exam findings (harsh murmur, thrill, shock) are classic hallmarks of a mechanical structural complication following a myocardial infarction.

Correlate the physical findings with the diagnostic data.

Bedside echocardiography confirms the left-to-right intracardiac shunt, validating the diagnosis of a ventricular septal rupture.

Anterior myocardial infarctions often compromise the blood supply (LAD artery) to the anterior portion of the interventricular septum, leading to macrophage-mediated tissue degradation and eventual rupture.

Determine the definitive treatment for the identified structural defect.

Emergency surgical septal repair is the necessary definitive intervention.

While medical stabilization (e.g., intra-aortic balloon pump, inotropes) may be initiated as a temporizing bridge, the structural defect strictly requires cardiothoracic surgical closure to restore forward cardiac output and prevent death.

Anahtar Kavram

Ventricular septal rupture is a life-threatening mechanical complication of myocardial infarction that presents with sudden cardiogenic shock, a new holosystolic murmur, and a palpable thrill. It requires prompt identification and emergency cardiothoracic surgical repair.

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Cevap

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