An 82-year-old man is evaluated on postoperative day 2 following an elective right total h… — USMLE Step 2 CK

An $82$ -year-old man is evaluated on postoperative day $2$ following an elective right total hip arthroplasty due to the sudden onset of shortness of breath and mild agitation. His medical history is significant for a $35$ -pack-year smoking history with known chronic obstructive pulmonary disease (COPD), major depressive disorder managed with citalopram, and diet-controlled type 2 diabetes mellitus. His temperature is $37.6^\circ\text{C}$ ( $99.7^\circ\text{F}$ ), blood pressure is $168/94\text{ mmHg}$ , heart rate is $114/\text{min}$ , and respiratory rate is $26/\text{min}$ . Pulse oximetry shows $87\%$ on room air. Physical examination reveals an elevated jugular venous pressure of $11\text{ cm H}_2\text{O}$ . Cardiac auscultation reveals a regular tachycardia with a prominent S3 gallop. Lung auscultation demonstrates diffuse, bilateral expiratory wheezes. The surgical incision is clean and intact. The lower extremities exhibit 2+ bilateral pitting edema. Initial laboratory studies show a normal complete blood count and a basic metabolic panel within normal limits. Thyroid studies reveal a thyroid-stimulating hormone (TSH) level of $1.4\text{ }\mu\text{U/mL}$ (normal: $0.4-4.0\text{ }\mu\text{U/mL}$ ) and a free T4 level of $0.6\text{ ng/dL}$ (normal: $0.9-1.7\text{ ng/dL}$ ). Which of the following is the most appropriate next step in the management of this patient?

A
Administer nebulized ipratropium and oral prednisone
B
Administer intravenous vancomycin and piperacillin-tazobactam
Administer intravenous furosemideAnswer
D
Administer intravenous linezolid
E
Initiate oral levothyroxine therapy

Answer

Administer intravenous furosemide

The correct answer addresses the patient's acute decompensated heart failure (ADHF). The classic triad of elevated jugular venous pressure, an S3 gallop, and bilateral lower extremity edema confirms that the patient's severe dyspnea and wheezing are cardiac in origin, a condition known as cardiac asthma. This acute volume overload is a common postoperative complication occurring around day 2 or 3 as third-spaced fluids shift back into the systemic circulation. Intravenous furosemide rapidly reduces preload and pulmonary congestion, serving as the definitive initial management.

Step-by-Step Solution

Analyze the physical examination findings, specifically the S3 gallop, elevated jugular venous pressure (JVP), and bilateral pitting edema.

These findings are highly specific for volume overload and right- and left-sided heart failure.

Differentiating between pulmonary and cardiac causes of dyspnea requires identifying structural and hemodynamic signs of cardiac dysfunction.

Contextualize the findings with the timeline (postoperative day 2) and the presence of wheezing.

The wheezing is identified as 'cardiac asthma' resulting from peribronchial interstitial edema as intraoperative third-spaced fluids mobilize back into the intravascular space.

Surgical patients often receive large volumes of intravenous fluids, leading to acute decompensated heart failure (ADHF) when these fluids shift intravascularly 48-72 hours postoperatively.

Determine the most appropriate immediate pharmacotherapy.

Intravenous loop diuretics (furosemide) are indicated to rapidly reduce intravascular volume and relieve pulmonary congestion.

Preload reduction is the cornerstone of managing acute decompensated heart failure in patients without severe hypotension or cardiogenic shock.

Key Concept

Acute decompensated heart failure can present with wheezing (cardiac asthma) and must be differentiated from COPD exacerbations using clinical signs of volume overload (elevated JVP, S3 gallop). Postoperative fluid mobilization often triggers this on days 2-3.

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