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Zorluk: OrtaInitial Stabilization and Triage

Paramedics arrive at the resuscitation bay with a 61-year-old male who developed crushing, substernal chest pressure radiating to his jaw two hours ago while gardening. He reports severe lightheadedness and nausea. Past medical history is significant for hyperlipidemia and osteoarthritis.

Upon arrival, his temperature is 37.0°C (98.6°F), blood pressure is 74/48 mmHg, heart rate is 52/min, and respiratory rate is 16/min. Oxygen saturation is 96% on room air.

Physical examination reveals a pale, diaphoretic patient. The jugular veins are markedly distended while the patient is sitting at a 45-degree angle. Auscultation of the chest reveals clear breath sounds bilaterally without wheezes or crackles. Heart sounds are distant, and no murmurs are appreciated.

A 12-lead electrocardiogram obtained by triage staff demonstrates 3-mm ST-segment elevations in leads II, III, and aVF, along with reciprocal ST-segment depressions in leads I and aVL.

Which of the following is the most appropriate next step in the initial stabilization of this patient?

  1. Administration of an isotonic intravenous fluid bolusCevap
  2. B
    Administration of sublingual nitroglycerin
  3. C
    Administration of intravenous metoprolol
  4. D
    Performance of an immediate portable echocardiogram
  5. E
    Transfer to radiology for computed tomography angiography of the chest

Cevap

Administration of an isotonic intravenous fluid bolus
The patient is experiencing profound hypotension due to an acute right ventricular (RV) myocardial infarction. This diagnosis is supported by the classic triad of hypotension, elevated jugular venous pressure (JVD), and clear lung fields, occurring alongside an inferior STEMI (ST elevations in II, III, aVF). The ischemic right ventricle becomes stiff and loses its contractile function, making it highly dependent on elevated preload to maintain blood flow to the left ventricle. Therefore, the most critical initial stabilization step is volume expansion with an isotonic intravenous fluid bolus (e.g., normal saline) to increase RV filling pressures and subsequently improve systemic cardiac output.

Adım Adım Çözüm

1
Analyze the clinical presentation and vital signs.
The patient has severe hypotension, bradycardia, clear lung fields, and jugular venous distention in the context of an acute ischemic event.
Identifying the specific hemodynamic state is required before intervening.
2
Interpret the electrocardiogram findings.
ST elevations in leads II, III, and aVF indicate an acute inferior myocardial infarction.
Inferior myocardial infarctions frequently involve the right ventricle, altering the standard acute coronary syndrome management pathway.
3
Synthesize findings to determine the underlying pathophysiology.
The triad of hypotension, clear lungs, and jugular venous distention in the setting of an inferior myocardial infarction is highly specific for a right ventricular infarction.
Right ventricular ischemia leads to a stiff right ventricle that relies on high preload to push blood into the pulmonary circulation and subsequently to the left ventricle.
4
Select the most appropriate initial stabilization step.
Administer isotonic intravenous fluids to maximize preload and optimize cardiac output.
Fluid resuscitation directly addresses the preload-dependent state causing the patient's profound hypotension.

Anahtar Kavram

Right ventricular myocardial infarction presents with hypotension, elevated jugular venous pressure, and clear lungs, and requires immediate stabilization with isotonic intravenous fluids to maintain adequate preload.
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Initial Stabilization and Triage

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