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Zorluk: OrtaInitial Stabilization and Triage

A 64-year-old man with a history of hypertension and hyperlipidemia is brought to the emergency department by ambulance due to severe, crushing substernal chest pain that began 45 minutes ago while shoveling snow. The patient is pale, profusely diaphoretic, and appears in acute distress. Vital signs are temperature 36.6°C (97.9°F), heart rate 42/min, blood pressure 72/40 mm Hg, respiratory rate 22/min, and oxygen saturation 96% on room air. Physical examination reveals marked jugular venous distention. Auscultation of the chest demonstrates clear lung fields bilaterally with no murmurs or gallops. An immediate 12-lead electrocardiogram shows 3-mm ST-segment elevations in leads II, III, and aVF, with reciprocal ST-segment depressions in leads I and aVL. Which of the following is the most appropriate next step in the management of this patient?

  1. Administration of an intravenous normal saline bolusCevap
  2. B
    Urgent cardiology consultation for percutaneous coronary intervention
  3. C
    Ordering a stat portable chest radiograph
  4. D
    Administration of sublingual nitroglycerin
  5. E
    Obtaining right-sided electrocardiogram leads

Cevap

Administration of an intravenous normal saline bolus
The correct answer is the administration of an intravenous normal saline bolus. This patient's presentation of profound hypotension, clear lung fields, and marked jugular venous distention in the setting of an acute inferior ST-elevation myocardial infarction (ST elevations in leads II, III, and aVF) strongly points to a right ventricular (RV) infarction. The ischemic right ventricle loses its contractile ability, making it extremely dependent on adequate preload (venous return) to push blood through the pulmonary circulation and into the left heart. The immediate initial stabilization step for the resulting cardiogenic shock is to maximize right-sided filling pressures by administering an intravenous fluid bolus, which improves RV cardiac output and corrects systemic hypotension.

Adım Adım Çözüm

1
Interpret the electrocardiogram findings.
ST elevations in leads II, III, and aVF indicate an acute inferior wall myocardial infarction.
Identifying the location of the infarction helps predict specific complications and guides tailored management.
2
Correlate the ECG findings with the physical examination.
The combination of hypotension, clear lung fields, and jugular venous distention forms the classic triad for a right ventricular infarction.
Inferior myocardial infarctions frequently involve the right ventricle, drastically altering the hemodynamic state of the patient.
3
Determine the pathophysiologic mechanism of the patient's shock.
Right ventricular ischemia leads to decreased contractility, making the heart highly dependent on adequate preload to maintain forward blood flow.
Understanding preload dependence is crucial for selecting the correct resuscitative intervention and avoiding harmful medications.
4
Select the immediate stabilization step.
Administer an intravenous normal saline bolus.
Fluids increase right-sided filling pressures, restoring cardiac output and stabilizing the severe hypotension before moving on to definitive percutaneous coronary intervention.

Anahtar Kavram

Patients with right ventricular myocardial infarction present with hypotension, clear lungs, and jugular venous distention; they are highly preload-dependent and require immediate stabilization with intravenous fluid boluses while avoiding preload-reducing medications like nitroglycerin.
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Konular

Initial Stabilization and Triage

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