Progressive respiratory distress and a persistent nighttime cough prompt a 68-year-old wom… — USMLE Step 2 CK

Progressive respiratory distress and a persistent nighttime cough prompt a $68$ -year-old woman to seek medical evaluation at a local urgent care clinic. She states that over the past $4$ days, she has been unable to sleep lying flat and has needed to prop herself up with three pillows. Her medical history includes hypertension, type 2 diabetes mellitus, a myocardial infarction three years prior, and a $30$ -pack-year smoking history. She currently uses an as-needed albuterol inhaler. Vital signs show a temperature of $37.1^\circ\text{C}$ ( $98.8^\circ\text{F}$ ), blood pressure of $156/94 \text{ mm Hg}$ , heart rate of $110/\text{min}$ , and respiratory rate of $26/\text{min}$ . Pulse oximetry reveals an oxygen saturation of $91\%$ on room air. Physical examination demonstrates prominent jugular venous distention when the patient is seated at a $45^\circ$ angle. Auscultation of the lungs reveals diffuse expiratory wheezes bilaterally and dullness to percussion at the bases. Cardiac auscultation identifies a regular tachycardia and a third heart sound (S3) gallop. A point-of-care arterial blood gas demonstrates a pH of $7.48$ , $\text{PaCO}_2$ of $30 \text{ mm Hg}$ , and $\text{PaO}_2$ of $64 \text{ mm Hg}$ . Which of the following is the most appropriate initial step in management for this patient?

Intravenous administration of torsemideCevap
B
Administration of inhaled tiotropium and oral prednisone
C
Initiation of intravenous azithromycin and ceftriaxone
D
Administration of intravenous sodium bicarbonate
E
Immediate endotracheal intubation

Cevap

The correct intervention is the intravenous administration of a loop diuretic, such as torsemide.

The correct approach is to initiate intravenous loop diuretic therapy. The patient's clinical presentation—progressive orthopnea, elevated jugular venous pressure, an S3 gallop, and bibasilar dullness—in the setting of a prior myocardial infarction is classic for acute decompensated heart failure (ADHF). The presence of wheezing in this context represents 'cardiac asthma,' a condition where peribronchial edema causes airway narrowing and bronchospasm. The arterial blood gas confirms an uncompensated respiratory alkalosis driven by hypoxia and tachypnea, which is typical for early pulmonary edema. Initial management of ADHF focuses on rapidly reducing preload with intravenous loop diuretics (such as torsemide or furosemide) alongside supplemental oxygen.

Adım Adım Çözüm

Analyze the vital signs and physical examination findings to identify the primary clinical syndrome.

The patient exhibits orthopnea, prominent jugular venous distention, bibasilar dullness, and an S3 gallop. These findings point to fluid overload and left ventricular failure.

Recognizing the signs of volume overload is essential to determine if respiratory distress is cardiogenic or pulmonary in origin.

Differentiate the etiology of the bilateral wheezing given the patient's smoking history.

Despite the history of smoking and the presence of wheezing, the S3 gallop and JVD confirm cardiogenic pulmonary edema (cardiac asthma) rather than a primary COPD exacerbation.

Cardiac asthma occurs when peribronchial edema causes airway narrowing, which mimics primary reactive airway disease but requires completely different management.

Determine the most appropriate initial pharmacological intervention for the established diagnosis.

Intravenous loop diuretics (e.g., torsemide, bumetanide, furosemide) are indicated to reduce fluid volume and lower pulmonary capillary wedge pressure.

Preload reduction is the primary mechanism to rapidly relieve pulmonary congestion and improve oxygenation in acute decompensated heart failure.

Anahtar Kavram

Patients with acute decompensated heart failure can present with wheezing (cardiac asthma) due to peribronchial edema, which must be distinguished from COPD exacerbations using signs of volume overload (JVD, S3 gallop) to ensure appropriate treatment with loop diuretics.

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