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Difficulty: HardInitial Stabilization and Triage

An ambulance brings a 58-year-old man to the acute care bay with a chief complaint of unremitting, heavy chest pain radiating to the left jaw that started 45 minutes prior. He appears profoundly weak and is sweating profusely. His medical history includes type 2 diabetes mellitus and hyperlipidemia. Vital signs show a blood pressure of 76/48 mmHg76/48\text{ mmHg}, a heart rate of 115 /min115\text{ /min}, a respiratory rate of 24 /min24\text{ /min}, and an oxygen saturation of 95%95\% on ambient air. Physical examination demonstrates distended neck veins while sitting at a 45∘45^{\circ} angle. Lung auscultation reveals clear breath sounds in all fields without adventitious sounds. An initial 12-lead electrocardiogram reveals 3 mm3\text{ mm} ST-segment elevations in leads II, III, and aVF. The patient is lethargic but responds to verbal stimuli. Which of the following is the most appropriate immediate next step in stabilizing this patient?

  1. Rapid infusion of an isotonic crystalloid solutionAnswer
  2. B
    Administration of sublingual nitroglycerin
  3. C
    Immediate transfer for percutaneous coronary intervention
  4. D
    Performance of right-sided electrocardiography
  5. E
    Procurement of a bedside chest radiograph

Answer

The correct step is the rapid infusion of an isotonic crystalloid solution.
The clinical triad of hypotension, jugular venous distention, and clear lung fields in the setting of inferior ST-segment elevations (leads II, III, and aVF) is the classic presentation of a right ventricular (RV) myocardial infarction. The ischemic right ventricle loses its contractility and becomes highly dependent on elevated right-sided filling pressures (preload) to push blood through the pulmonary circulation and fill the left ventricle. Because this patient is in severe cardiogenic shock, the absolute priority is to support the RV preload. Rapid intravenous infusion of an isotonic crystalloid solution (such as normal saline) maximizes venous return, improves RV forward flow, and stabilizes the systemic blood pressure. This life-saving stabilization must occur before the patient is transported for definitive reperfusion therapy.

Step-by-Step Solution

1
Identify the underlying diagnosis from the clinical triad.
Inferior ST-elevation myocardial infarction complicated by right ventricular (RV) involvement, evidenced by hypotension, jugular venous distention, and clear lungs.
Accurate diagnosis dictates the stabilization pathway, as RV infarction management differs significantly from standard left-sided myocardial infarction.
2
Analyze the hemodynamic state.
The patient is in cardiogenic shock (blood pressure 76/48 mmHg76/48\text{ mmHg}) due to right ventricular failure.
The ischemic right ventricle relies almost entirely on venous return (preload) to maintain forward flow and left ventricular filling.
3
Determine the most urgent stabilization priority.
Administer rapid intravenous fluids.
Before any definitive therapeutic or diagnostic procedures can be performed safely, the patient's preload must be aggressively supported to prevent imminent cardiovascular collapse.

Key Concept

Initial hemodynamic stabilization of right ventricular myocardial infarction requires aggressive volume expansion with isotonic crystalloids.
Estimated Time:1m 30s
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Topics

Initial Stabilization and Triage

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