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Difficulty: MediumPreoperative and Postoperative Care

While recovering in the surgical intensive care unit, a 76-year-old male patient develops acute respiratory distress. He underwent an extensive open bowel resection and anastomosis for mesenteric ischemia approximately four hours ago. The surgical log indicates an estimated blood loss of 1,200 mL, for which he was resuscitated with 3 units of packed red blood cells and 4 liters of lactated Ringer solution. The patient is conscious and complains of severe difficulty breathing. Vital signs reveal a temperature of 38.1°C (100.6°F), blood pressure of 175/98 mm Hg, heart rate of 115/min, and a respiratory rate of 28/min. Pulse oximetry displays an oxygen saturation of 85% on room air. Physical assessment is notable for engorged jugular veins and a prominent S3 heart sound. Auscultation of the chest demonstrates bilateral crackles extending to the mid-lung fields. A portable chest radiograph displays cardiomegaly and bilateral hazy alveolar opacities.

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

  1. Administration of intravenous furosemideAnswer
  2. B
    Administration of intravenous methylprednisolone
  3. C
    Initiation of empiric broad-spectrum antibiotics
  4. D
    Computed tomography pulmonary angiography
  5. E
    Chest physiotherapy and incentive spirometry

Answer

The correct answer is the administration of intravenous furosemide, which treats Transfusion-Associated Circulatory Overload (TACO) by inducing diuresis and reducing cardiac preload.
This patient's presentation of acute respiratory distress, hypertension, tachycardia, jugular venous distention (JVD), an S3 gallop, and bilateral alveolar infiltrates shortly after receiving large volumes of intravenous fluids and blood products is highly characteristic of Transfusion-Associated Circulatory Overload (TACO).

TACO is a form of acute decompensated heart failure resulting from the rapid infusion of fluids expanding the intravascular volume beyond the cardiovascular system's capacity to compensate. The immediate goal of management is preload reduction to relieve hydrostatic pulmonary edema. Intravenous loop diuretics, such as furosemide, are the first-line therapy, along with supplemental oxygen.

FeatureTACOTRALI
PathophysiologyHydrostatic pulmonary edema (volume overload)Increased vascular permeability (immune-mediated)
Blood PressureUsually elevated (Hypertension)Usually normal or low (Hypotension)
Cardiac ExamJVD, S3 gallopNormal
Chest X-rayCardiomegaly, widened vascular pedicleNormal heart size
ManagementDiuretics (e.g., Furosemide), oxygenSupportive care, oxygen

Step-by-Step Solution

1
Analyze the patient's acute respiratory distress in the context of recent massive fluid and blood product resuscitation.
The patient received large volumes of crystalloid (4 L) and blood (3 units) a few hours ago, making volume overload highly probable.
Identifying the fluid balance is crucial for determining the etiology of early postoperative hypoxia.
2
Evaluate the vital signs and physical examination findings.
The patient exhibits hypertension, tachycardia, hypoxia, jugular venous distention (JVD), an S3 gallop, and bilateral crackles.
These findings are classic for cardiogenic pulmonary edema and distinguish it from non-cardiogenic causes of respiratory failure.
3
Interpret the chest radiograph findings.
Cardiomegaly and bilateral hazy alveolar opacities confirm the presence of cardiogenic pulmonary edema.
A chest radiograph helps differentiate cardiogenic (cardiomegaly present) from non-cardiogenic (normal heart size) pulmonary edema.
4
Synthesize the data to establish a diagnosis and determine the next best step.
The diagnosis is Transfusion-Associated Circulatory Overload (TACO). The immediate treatment is preload reduction with intravenous furosemide.
Furosemide diuresis is the first-line targeted therapy to clear pulmonary edema in volume-overloaded patients.

Key Concept

Transfusion-Associated Circulatory Overload (TACO) presents with acute respiratory distress, hypertension, tachycardia, jugular venous distention, an S3 gallop, and cardiomegaly on chest radiograph within 6 hours of transfusion. The primary treatment is preload reduction with intravenous loop diuretics.
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Topics

Preoperative and Postoperative Care

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