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Difficulty: HardCardiovascular System

A ward nurse urgently pages the on-call physician to evaluate a 71-year-old male inpatient for acute clinical deterioration. The patient was admitted two days prior for a presumed mild lower respiratory tract infection. His medical history is significant for a prior anterior myocardial infarction, diet-controlled type 2 diabetes, and a 45-pack-year smoking history. Upon evaluation, the patient is lethargic, diaphoretic, and in profound respiratory distress. Vital signs are temperature 37.0°C (98.6°F), blood pressure 82/54 mm Hg, pulse 124/min, and respirations 28/min. Pulse oximetry displays 84% on room air. Physical examination reveals cool, clammy extremities. Chest auscultation demonstrates diffuse, high-pitched expiratory wheezing bilaterally without focal crackles. Cardiac auscultation reveals tachycardia with a distinct low-frequency sound heard immediately following S2S_2. Sustained pressure over the right upper abdominal quadrant causes the neck veins to visibly engorge and remain elevated. Arterial blood gas analysis on room air reveals a pHpH of 7.26, PaCO2PaCO_2 of 60 mm Hg, and HCO3−HCO_3^- of 26 mEq/L. Which of the following is the most appropriate next step in the management of this patient?

  1. Initiation of intravenous vasopressor support and urgent bedside echocardiographyAnswer
  2. B
    Administration of systemic methylprednisolone and continuous nebulized albuterol
  3. C
    Administration of intravenous sodium bicarbonate to correct the acidemia
  4. D
    Escalation to broad-spectrum intravenous antibiotics such as vancomycin and piperacillin-tazobactam
  5. E
    Transfer of the patient to the radiology suite for computed tomography pulmonary angiography

Answer

Initiation of intravenous vasopressor support and urgent bedside echocardiography is the most appropriate next step.
The correct answer is the initiation of intravenous vasopressor support and urgent bedside echocardiography. This patient is presenting with cardiogenic shock, characterized by hypotension (82/54 mm Hg), poor end-organ perfusion (lethargy, cool/clammy extremities, acute respiratory failure), and signs of left and right ventricular failure (S3S_3 gallop, positive hepatojugular reflux). The diffuse wheezing represents 'cardiac asthma' caused by peribronchial mucosal edema secondary to elevated pulmonary venous pressures. Because the patient is profoundly hypotensive, traditional acute decompensated heart failure therapies like intravenous furosemide or nitroglycerin are contraindicated as they would further compromise cardiac output. The immediate priority is restoring perfusion pressure with vasopressors (e.g., norepinephrine) and performing a bedside echocardiogram to evaluate the specific etiology of the shock (e.g., acute valvular dysfunction, progressive ischemic cardiomyopathy) without moving the unstable patient.

Step-by-Step Solution

1
Analyze the physical examination findings to identify the underlying pathophysiology.
The patient has an S3S_3 gallop (low-frequency sound after S2S_2) and positive hepatojugular reflux, indicating elevated left ventricular filling pressures and right-sided volume overload.
Differentiating cardiac asthma (wheezing due to peribronchial edema) from a primary pulmonary process like a COPD exacerbation relies heavily on recognizing these key cardiac signs.
2
Assess the patient's hemodynamic and acid-base status.
The patient is in cardiogenic shock (blood pressure 82/54 mm Hg, cool/clammy extremities, lethargy) with acute respiratory acidosis (pHpH 7.26, PaCO2PaCO_2 60 mm Hg).
The presence of profound hypotension drastically changes heart failure management, contraindicating standard therapies like loop diuretics or vasodilators until perfusion is restored.
3
Determine the safest and most effective initial management step.
The patient requires immediate blood pressure support with vasopressors and bedside evaluation of cardiac function using echocardiography.
An unstable patient must not be moved for advanced imaging (like CT), and interventions must target the primary mechanism of decompensation (pump failure).

Key Concept

Cardiogenic shock can present with wheezing (cardiac asthma) that mimics pulmonary disease; management requires immediate bedside stabilization with vasopressors/inotropes rather than diuretics, which are contraindicated in hypotensive shock.
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Topics

Cardiovascular System

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