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Difficulty: HardPreoperative and Postoperative Care

A 7474-year-old man is evaluated on the surgical ward for progressively worsening shortness of breath. He underwent an open right hemicolectomy for colon adenocarcinoma 4848 hours ago. The patient has a medical history of diet-controlled type 2 diabetes mellitus, chronic obstructive pulmonary disease, and ischemic cardiomyopathy with a most recent left ventricular ejection fraction of 35%35\%. During the operation, he received 3.53.5 liters of crystalloid solution. His temperature is 38.1∘C38.1^\circ\text{C} (100.6∘F100.6^\circ\text{F}), blood pressure is 152/88152/88 mmHg, pulse is 112112/min, and respiratory rate is 2424/min. Pulse oximetry shows an oxygen saturation of 89%89\% on room air. Physical examination reveals an estimated jugular venous pressure of 1010 cm H2O\text{H}_2\text{O}. Chest auscultation reveals bilateral basilar crackles and diffuse expiratory wheezes. The surgical incision is clean, dry, and intact. A portable chest radiograph demonstrates an enlarged cardiac silhouette, prominent central pulmonary vessels, and bilateral patchy alveolar opacities at the bases. Which of the following is the most appropriate next step in management of this patient's respiratory distress?

  1. A
    Intravenous piperacillin-tazobactam
  2. B
    Nebulized albuterol and intravenous methylprednisolone
  3. C
    CT angiography of the chest
  4. Intravenous furosemideAnswer
  5. E
    Incentive spirometry and targeted chest physiotherapy

Answer

Intravenous furosemide
The correct answer is intravenous furosemide. This patient is experiencing acute decompensated heart failure (ADHF) secondary to the mobilization of third-spaced fluids. During major abdominal surgery, large volumes of intravenous crystalloids are often administered to maintain perfusion. Over the subsequent 4848 to 7272 hours, this fluid shifts back into the intravascular space. In patients with underlying ventricular dysfunction (e.g., ischemic cardiomyopathy with an ejection fraction of 35%35\%), this sudden increase in preload can precipitate ADHF. The classic presentation includes dyspnea, hypoxia, elevated jugular venous pressure (JVP), and basilar crackles. Wheezing ('cardiac asthma') may also occur due to peribronchial edema. The chest radiograph confirms the diagnosis with an enlarged cardiac silhouette, prominent pulmonary vasculature, and bilateral alveolar opacities. The most appropriate next step is diuresis with intravenous furosemide to reduce intravascular volume and relieve pulmonary congestion. The low-grade fever (38.1∘C38.1^\circ\text{C}) is a normal physiologic response to surgical trauma and cytokine release on postoperative day 22, not necessarily a sign of infection.

Step-by-Step Solution

1
Analyze the patient's postoperative timeline and fluid balance.
The patient is 4848 hours post-operation after receiving 3.53.5 L of intraoperative fluids, which corresponds to the typical window for third-space fluid mobilization into the intravascular space.
Understanding the timeline of fluid shifts is critical for identifying volume overload.
2
Evaluate the clinical signs and vital signs.
The patient has hypoxia, an elevated jugular venous pressure (1010 cm H2O\text{H}_2\text{O}), basilar crackles, and wheezing. Low-grade fever is present but common and non-specific post-operation.
Elevated JVP and crackles strongly point to cardiogenic pulmonary edema rather than primary pulmonary pathology.
3
Interpret the chest radiograph findings.
The radiograph shows cardiomegaly, prominent central pulmonary vessels, and bilateral opacities, confirming fluid overload.
Radiographic evidence differentiates heart failure from pneumonia (focal consolidation) or COPD/PE (which typically lack cardiomegaly and vascular congestion).
4
Select the appropriate therapeutic intervention.
Intravenous furosemide is indicated to rapidly reduce intravascular volume and alleviate pulmonary edema.
Diuresis is the first-line treatment for acute decompensated heart failure due to fluid overload.

Key Concept

Postoperative acute decompensated heart failure typically occurs 4848 to 7272 hours after surgery due to the mobilization of third-spaced fluids, presenting with hypoxia, elevated jugular venous pressure, crackles, and radiographic evidence of pulmonary edema.
Estimated Time:1m 30s
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Topics

Preoperative and Postoperative Care

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