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Zorluk: KolayCardiovascular System

Emergency medical personnel transport a 6161-year-old male to the hospital shortly after he experienced the sudden onset of severe, crushing retrosternal chest pain. The pain began while he was resting and is accompanied by profound diaphoresis. His medical history includes type 2 diabetes mellitus, hyperlipidemia, and a 3535 pack-year smoking history. Upon arrival, he appears pale and lethargic. Vital signs demonstrate a blood pressure of 84/5284/52 mmHg and a heart rate of 5656/min. Physical examination reveals prominent distention of the jugular veins when the patient is positioned at a 45∘45^\circ angle. Auscultation of the chest demonstrates completely clear lung fields bilaterally. Cardiac auscultation reveals bradycardia but no murmurs, rubs, or gallops. An electrocardiogram is rapidly obtained and shows 33-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 initial intervention to address this patient's hemodynamic state?

  1. Rapid infusion of isotonic salineCevap
  2. B
    Intravenous injection of furosemide
  3. C
    Sublingual application of nitroglycerin
  4. D
    Bolus dose of intravenous metoprolol
  5. E
    Prompt endotracheal intubation

Cevap

Rapid infusion of isotonic saline.
The patient's clinical presentation of profound hypotension, jugular venous distention, and completely clear lung fields, combined with an inferior ST-elevation myocardial infarction (STEMI in leads II, III, and aVF), is the classic triad of an acute right ventricular infarction. Because the ischemic right ventricle loses its ability to pump effectively, it becomes highly dependent on elevated venous return (preload) to force blood through the pulmonary circulation and maintain adequate left ventricular filling. The correct initial management for the resulting cardiogenic shock is volume expansion with a rapid infusion of isotonic fluids (e.g., normal saline). This maximizes right ventricular preload and subsequently improves overall cardiac output.

Adım Adım Çözüm

1
Analyze the electrocardiogram findings.
ST-segment elevations in the inferior leads (II, III, and aVF) confirm the diagnosis of an acute inferior ST-elevation myocardial infarction (STEMI).
Identifying the location of the infarction is critical for predicting potential mechanical or hemodynamic complications.
2
Interpret the physical examination findings in the context of the infarction.
The classic triad of hypotension, elevated jugular venous pressure (JVP), and clear lung fields points strongly to concurrent right ventricular infarction.
Up to half of inferior STEMIs involve the right ventricle. The right ventricle fails to pump blood forward, causing blood to back up (JVP) while the left ventricle remains under-filled (causing clear lungs and hypotension).
3
Determine the optimal hemodynamic intervention.
The impaired right ventricle becomes highly dependent on venous return (preload) to push blood into the pulmonary circulation. Intravenous fluids are required to increase this preload.
Interventions that decrease preload (like nitrates or diuretics) will precipitate profound cardiovascular collapse in this setting.

Anahtar Kavram

Right ventricular infarction classically presents with hypotension, elevated jugular venous pressure, and clear lungs; it requires maintenance of right ventricular preload with intravenous fluid boluses and absolute avoidance of preload-reducing agents such as nitrates and diuretics.
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Cardiovascular System

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