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Difficulty: MediumPreoperative and Postoperative Care

A 71-year-old man is evaluated on the surgical floor for acute-onset dyspnea, orthopnea, and palpitations. He underwent an elective open left radical nephrectomy for localized renal cell carcinoma 48 hours ago. The patient has a history of chronic obstructive pulmonary disease (COPD) and ischemic cardiomyopathy. His current medications include inhaled umeclidinium, low-dose aspirin, and atorvastatin. Temperature is 37.8°C (100.0°F), blood pressure is 105/65 mm Hg, pulse is 115/min and irregularly irregular, and respirations are 28/min. Pulse oximetry shows 89% on room air. The patient is sitting on the edge of the bed and using accessory muscles of respiration. Neck examination demonstrates distended jugular veins while upright. Pulmonary auscultation reveals bilateral dependent crackles, but no expiratory wheezing is present. Cardiac examination confirms an irregular rhythm with a prominent S3 gallop. The surgical incision is well-approximated with no purulent drainage. Which of the following are the most appropriate immediate steps in the management of this patient? (Select all that apply)

  1. Provide loop diuretic therapy and monitor urine output closelyAnswer
  2. Provide noninvasive positive pressure ventilation or supplemental oxygenAnswer
  3. C
    Prescribe nebulized short-acting bronchodilators and systemic glucocorticoids
  4. D
    Start empiric antimicrobial coverage for presumed hospital-acquired pneumonia
  5. E
    Request an urgent contrast-enhanced abdominal imaging study to evaluate the surgical bed

Answer

The correct steps are to provide loop diuretic therapy and to provide noninvasive positive pressure ventilation or supplemental oxygen.
This patient's acute respiratory distress on postoperative day 2 is due to acute decompensated heart failure (ADHF) with pulmonary edema. In the first 24 to 48 hours following major surgery, third-spaced fluids begin to mobilize back into the intravascular space. In a patient with baseline ischemic cardiomyopathy, this rapid intravascular volume expansion can overwhelm the left ventricle, leading to elevated filling pressures, pulmonary edema, and a prominent S3 gallop. The new irregularly irregular rhythm suggests atrial fibrillation, a common postoperative trigger that further impairs cardiac output and exacerbates heart failure. Immediate management requires a two-pronged approach: reducing preload with loop diuretic therapy and supporting oxygenation with supplemental oxygen or noninvasive positive pressure ventilation (NPPV).

Step-by-Step Solution

1
Analyze the patient's respiratory distress timeline and physical examination findings.
The presence of orthopnea, jugular venous distention, bilateral crackles, and an S3 gallop strongly suggests acute decompensated heart failure (ADHF) with pulmonary edema.
Postoperative fluid mobilization, which typically begins 24 to 48 hours after surgery, can overwhelm a patient with baseline ischemic cardiomyopathy, leading to rapid volume overload.
2
Determine the most appropriate immediate therapeutic interventions based on the diagnosis.
The patient requires urgent preload reduction and respiratory support.
Loop diuretics effectively decrease volume overload and lower ventricular filling pressures, while supplemental oxygen or noninvasive ventilation directly improves alveolar oxygen exchange compromised by pulmonary edema.

Key Concept

Postoperative fluid mobilization (typically occurring on POD 2-3) can trigger acute decompensated heart failure in patients with impaired left ventricular function. Management focuses on diuresis and respiratory support, and recognizing these clinical signs over those of a COPD exacerbation is critical.
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Topics

Preoperative and Postoperative Care

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