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Difficulty: MediumCardiovascular System

A 68-year-old woman is evaluated in the surgical telemetry unit on postoperative day 3 following an uncomplicated partial colectomy for early-stage colon cancer. Over the last 4 hours, she has developed severe shortness of breath and a cough productive of pink, frothy sputum. During her surgery and the immediate postoperative period, she received a total of 6 liters of intravenous crystalloids. Her medical history includes hypertension, osteoarthritis, and a 40-pack-year smoking history.

Her temperature is 37.7°C (99.9°F), blood pressure is 180/100 mmHg, pulse is 115/min, and respirations are 28/min. Pulse oximetry is 86% on room air.

Physical examination reveals a patient in moderate respiratory distress, using accessory muscles of respiration. Jugular venous distention is present to the angle of the mandible while the patient is sitting at a 45-degree angle. Lung auscultation reveals diffuse bilateral expiratory wheezes and crackles extending halfway up both lung fields. Cardiac auscultation reveals a regular tachycardia with a prominent third heart sound (S3S_3).

Arterial blood gas analysis on room air shows:
pH: 7.28
PaCO2PaCO_2: 56 mmHg
PaO2PaO_2: 54 mmHg
HCO3−HCO_3^-: 25 mEq/L

Which of the following is the most appropriate next step in the management of this patient?

  1. Intravenous furosemide and noninvasive positive-pressure ventilationAnswer
  2. B
    Inhaled albuterol, inhaled ipratropium, and intravenous methylprednisolone
  3. C
    Intravenous piperacillin-tazobactam and sputum cultures
  4. D
    Computed tomography scan of the abdomen and pelvis
  5. E
    Intravenous sodium bicarbonate infusion

Answer

Intravenous furosemide and noninvasive positive-pressure ventilation
The correct answer outlines the standard initial therapy for acute decompensated heart failure (ADHF) complicated by acute respiratory failure. This patient developed iatrogenic volume overload from massive perioperative crystalloid resuscitation. The resulting left ventricular end-diastolic pressure elevation caused pulmonary edema, clinically manifesting as hypoxia, crackles, and wheezing (cardiac asthma). The combination of intravenous furosemide (to accomplish rapid venodilation and subsequent diuresis) and noninvasive positive-pressure ventilation (NPPV) is the most appropriate next step. NPPV decreases the work of breathing, improves alveolar gas exchange, and beneficially reduces both left ventricular preload and afterload.

Step-by-Step Solution

1
Analyze the clinical presentation and physical examination findings.
The patient exhibits severe dyspnea, hypoxia, hypertension, JVD, an S3S_3 gallop, and crackles/wheezes following administration of 6 liters of intravenous fluid.
Identifying the constellation of volume overload signs establishes the diagnosis of acute decompensated heart failure (ADHF).
2
Evaluate the arterial blood gas (ABG) results.
The ABG shows a pH of 7.28, a high PaCO2PaCO_2 of 56 mmHg, and a normal HCO3−HCO_3^- of 25 mEq/L.
This confirms an acute, uncompensated respiratory acidosis secondary to alveolar fluid accumulation and impending respiratory failure.
3
Determine the most appropriate immediate medical intervention.
Select preload reduction (loop diuretics) and ventilatory support (NPPV).
Furosemide rapidly reduces intravascular volume and acts as a venodilator. NPPV improves oxygenation, opens fluid-filled alveoli, and decreases the work of breathing while reducing left ventricular preload and afterload.

Key Concept

The initial management of acute decompensated heart failure with pulmonary edema and respiratory failure includes aggressive preload reduction with loop diuretics and the application of noninvasive positive-pressure ventilation (NPPV).
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Topics

Cardiovascular System

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