Progressive shortness of breath over three days prompted the family of a 71-year-old male … — USMLE Step 3

Progressive shortness of breath over three days prompted the family of a 71-year-old male to transport him to the hospital. He has a documented history of severe chronic obstructive pulmonary disease. According to his relatives, his cough has worsened, producing purulent sputum, and his mentation has significantly declined since the morning. Upon initial triage evaluation, the patient is somnolent and withdraws only from painful stimuli. He displays shallow, rapid respiratory efforts with profound utilization of the sternocleidomastoid and scalene muscles. Vital signs are recorded as follows: temperature $38.1^\circ \text{C}$ ( $100.6^\circ \text{F}$ ), blood pressure $152/95 \text{ mmHg}$ , heart rate $118/\text{min}$ , respiratory rate $32/\text{min}$ , and pulse oximetry $81\%$ while breathing ambient air. Auscultation of the thorax demonstrates markedly decreased air entry globally with faint end-expiratory wheezes. Which of the following represents the most appropriate immediate next step in management?

A
Administration of systemic corticosteroids and bronchodilators
B
Initiation of noninvasive positive-pressure ventilation
Endotracheal intubationAnswer
D
Portable chest radiography
E
Transfer to the intensive care unit for close observation

Answer

Endotracheal intubation

The correct answer is endotracheal intubation. This patient is presenting with a severe acute exacerbation of chronic obstructive pulmonary disease, likely triggered by a respiratory infection, leading to hypercapnic encephalopathy. The primary principle of initial stabilization and triage is the ABC sequence (Airway, Breathing, Circulation). A patient who is somnolent, withdrawing only from painful stimuli, and exhibiting shallow respirations with severe hypoxemia is in impending respiratory failure. More importantly, his depressed mental status indicates he has lost the ability to reliably protect his airway. In this clinical scenario, definitive airway management via endotracheal intubation is the single most urgent priority, taking precedence over determining the exact etiology, obtaining imaging, or initiating specific pharmacologic therapies.

Step-by-Step Solution

Assess the patient's clinical stability and airway competency.

The patient exhibits impending respiratory failure, severe hypoxemia, and profound altered mental status (somnolence).

Triage principles dictate that the immediate priority in any critical patient is the evaluation of Airway, Breathing, and Circulation (ABCs) to identify life-threatening instability.

Select the appropriate modality for airway management and respiratory support.

Endotracheal intubation is chosen over noninvasive ventilation and medical therapy.

The patient's severely depressed level of consciousness means he cannot clear secretions or protect his airway, making noninvasive ventilation dangerous and an invasive airway mandatory.

Key Concept

Immediate airway stabilization via endotracheal intubation is the top priority for patients presenting with impending respiratory failure complicated by altered mental status, bypassing non-invasive measures and diagnostics.

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