A 72-year-old man visits the urgent care clinic complaining of progressive difficulty brea… — USMLE Step 2 CK

A $72$ -year-old man visits the urgent care clinic complaining of progressive difficulty breathing and a non-productive cough over the past $3$ days. He states his "asthma" is acting up again and requests a refill of his inhalers. His past medical history includes severe chronic obstructive pulmonary disease (COPD) requiring $2$ L/min of home oxygen, ischemic heart disease with a prior myocardial infarction, and type $2$ diabetes mellitus. His current medications include inhaled tiotropium, inhaled fluticasone-salmeterol, and metformin. Vital signs reveal a temperature of $37.0^\circ\text{C}$ ( $98.6^\circ\text{F}$ ), blood pressure of $162/94$ mm Hg, heart rate of $115$ /min, and respiratory rate of $26$ /min. Oxygen saturation is $89\%$ on his baseline $2$ L/min oxygen. The patient is sitting upright and using accessory muscles to breathe. Examination of the neck demonstrates distended external jugular veins up to the angle of the mandible while sitting at a $45^\circ$ incline. Lung auscultation reveals diffuse expiratory wheezing and scattered fine crackles at the bilateral lung bases. Cardiac examination reveals a regular tachycardia with a low-frequency diastolic sound heard just after S2 at the cardiac apex. Abdominal exam reveals mild hepatomegaly. Bilateral pitting edema is noted up to the mid-calves. Bedside ultrasound of the lungs demonstrates diffuse, vertically oriented, laser-like artifacts extending from the pleural line to the bottom of the screen (B-lines) in all lung fields. Which of the following is the most appropriate initial pharmacological intervention for this patient's current condition?

A
Systemic glucocorticoids and inhaled bronchodilators
B
Intravenous vancomycin and cefepime
Intravenous furosemide therapyAnswer
D
Intravenous esmolol therapy
E
Rapid infusion of $0.9\%$ normal saline

Answer

The correct answer is intravenous furosemide therapy.

The correct answer is intravenous furosemide therapy. This patient presents with classic signs of acute decompensated heart failure (ADHF), including elevated jugular venous pressure, an S3 gallop, hepatomegaly, and peripheral edema. The fluid accumulation in the peribronchial interstitium can compress airways, causing wheezing (often referred to clinically as 'cardiac asthma'). Bedside ultrasound showing diffuse B-lines confirms pulmonary alveolar and interstitial edema. Loop diuretics are the initial pharmacological intervention of choice to reduce intravascular volume, decrease left ventricular preload, and relieve pulmonary congestion.

Step-by-Step Solution

Analyze the patient's respiratory presentation and vital signs.

The patient is hypoxic and tachypneic with diffuse wheezing, which initially suggests obstructive airway disease or peribronchial edema.

To determine the severity and formulate an initial differential diagnosis for the dyspnea.

Evaluate the physical examination and point-of-care ultrasound findings.

Elevated jugular venous pressure, an S3 gallop, hepatomegaly, peripheral edema, and ultrasound B-lines are identified.

To differentiate between a chronic obstructive pulmonary disease exacerbation and acute decompensated heart failure.

Synthesize the clinical findings to establish the primary diagnosis.

The presence of an S3 gallop and B-lines confirms volume overload and elevated left ventricular filling pressures, diagnosing acute decompensated heart failure (so-called 'cardiac asthma').

To guide appropriate and safe pharmacological management.

Select the most appropriate initial pharmacological intervention.

Intravenous loop diuretic therapy is chosen.

Loop diuretics rapidly reduce intravascular volume and pulmonary congestion, alleviating the respiratory distress.

Key Concept

Differentiating acute decompensated heart failure ('cardiac asthma') from a COPD exacerbation using physical examination and bedside ultrasound to guide initial diuretic therapy.

Estimated Time:1m 30s

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