Paramedics transport an 82-year-old male resident of an assisted living facility to the ac… — USMLE Step 2 CK

Paramedics transport an $82$ -year-old male resident of an assisted living facility to the acute care bay after he was found severely short of breath and lethargic. His medical history is significant for ischemic cardiomyopathy with a left ventricular ejection fraction of $30\%$ , severe chronic obstructive pulmonary disease (COPD), and stage $3$ chronic kidney disease. Vital signs reveal a temperature of $37.0^\circ\text{C}$ ( $98.6^\circ\text{F}$ ), blood pressure of $84/52\text{ mm Hg}$ , pulse of $110/\text{min}$ and irregularly irregular, and respiratory rate of $32/\text{min}$ . Pulse oximetry is $80\%$ on room air. Physical examination reveals a somnolent patient using accessory muscles of respiration. Jugular venous distention is prominent up to the angle of the mandible. Auscultation of the lungs reveals diffuse bilateral expiratory wheezing with no focal consolidation. Cardiac examination demonstrates a prominent $S_3$ gallop and a $2/6$ holosystolic murmur at the apex. Point-of-care arterial blood gas analysis on room air reveals:

$\text{pH}$ : $7.16$
$\text{pCO}_2$ : $74\text{ mm Hg}$
$\text{pO}_2$ : $48\text{ mm Hg}$
$\text{HCO}_3^-$ : $25\text{ mEq/L}$

Which of the following is the most appropriate next step in management?

Endotracheal intubation and intravenous dobutamineAnswer
B
Noninvasive positive-pressure ventilation and systemic corticosteroids
C
Computed tomography angiography of the chest
D
Intravenous sodium bicarbonate and continuous albuterol nebulization
E
Intravenous levofloxacin and normal saline bolus

Answer

Endotracheal intubation and intravenous dobutamine

This patient presents with cardiogenic shock and acute hypercapnic/hypoxemic respiratory failure secondary to acute decompensated heart failure (ADHF). The presence of severe hypotension (

84/52\text{ mm Hg}

), elevated jugular venous pressure, an

S_3

gallop, and 'cardiac asthma' (wheezing secondary to peribronchial edema) strongly points to left ventricular failure. Crucially, the patient is somnolent. Altered mental status is an absolute contraindication to noninvasive positive-pressure ventilation (NPPV) due to the high risk of aspiration and inability to clear secretions. Therefore, endotracheal intubation is required for definitive airway management. Concurrently, dobutamine, an inotrope, is indicated to improve cardiac output in the setting of cardiogenic shock.

Step-by-Step Solution

Analyze the clinical presentation and physical exam.

Hypotension, elevated JVP, S3 gallop, and wheezing in a patient with ischemic cardiomyopathy.

These findings strongly indicate acute decompensated heart failure (ADHF) complicated by cardiogenic shock, with wheezing representing 'cardiac asthma' due to peribronchial edema.

Interpret the arterial blood gas (ABG) data.

pH 7.16, pCO2 74 mm Hg, HCO3 25 mEq/L.

This confirms acute, uncompensated respiratory acidosis. The normal HCO3- level demonstrates this is a sudden acute event (like flash pulmonary edema) rather than chronic retention from his COPD.

Assess the patient's neurologic status for airway management.

The patient is somnolent/lethargic.

Altered mental status is an absolute contraindication for noninvasive positive-pressure ventilation (NPPV) due to the inability to protect the airway and high risk of aspiration.

Determine the definitive next step in management.

Endotracheal intubation for airway protection and ventilation, alongside dobutamine for inotropic support.

The patient requires immediate definitive airway control (intubation) and pharmacological support (dobutamine) to increase cardiac output in the setting of cardiogenic shock.

Key Concept

Airway management and hemodynamic support in acute decompensated heart failure with cardiogenic shock.

Estimated Time:2m 0s

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