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Difficulty: MediumCardiovascular System

A physician is evaluating a 62-year-old man on the medical ward due to acute-onset severe shortness of breath. The patient was admitted 24 hours ago for community-acquired pneumonia and was started on targeted antimicrobial therapy with ceftriaxone and azithromycin. In the emergency department, his initial blood pressure was 88/58 mm Hg, for which he received a total of 4 liters of normal saline. His blood pressure subsequently normalized. His past medical history includes chronic obstructive pulmonary disease (COPD), hypertension, and hypothyroidism. Currently, he reports worsening dyspnea and difficulty breathing while lying flat. His temperature is 37.1 C (98.8 F), blood pressure is 158/92 mm Hg, pulse is 112/min, and respirations are 26/min. Pulse oximetry is 86% on room air. Physical examination shows distended neck veins up to 10 cm above the sternal angle. Cardiac auscultation reveals a regular tachycardia with a prominent third heart sound (S3). Lung examination demonstrates bilateral crackles extending to the mid-lung fields, alongside the previously noted right lower lobe bronchial breath sounds. There is mild bilateral lower extremity pitting edema. Arterial blood gas analysis on room air shows pH=7.32pH = 7.32, pCO2=52 mm HgpCO_2 = 52\text{ mm Hg}, and pO2=56 mm HgpO_2 = 56\text{ mm Hg}. Which of the following is the most appropriate next step in management for this patient's acute respiratory decline?

  1. A
    Intravenous methylprednisolone and nebulized bronchodilators
  2. B
    Addition of broad-spectrum antimicrobials including vancomycin
  3. Intravenous furosemide therapyAnswer
  4. D
    Intravenous sodium bicarbonate infusion
  5. E
    Stat measurement of serum thyroid-stimulating hormone

Answer

Intravenous furosemide therapy
The correct answer is the administration of intravenous furosemide. This patient was admitted with pneumonia and appropriately resuscitated with 4 liters of normal saline for hypotension. However, he has now developed acute decompensated heart failure (ADHF) characterized by volume overload, as evidenced by new-onset orthopnea, significantly elevated jugular venous pressure, an S3 gallop, and bilateral crackles. The aggressive intravenous fluid resuscitation likely overwhelmed his cardiovascular reserve, precipitating iatrogenic pulmonary edema. Intravenous loop diuretics, such as furosemide, are the first-line therapy for ADHF; they provide rapid relief of symptoms by reducing intravascular volume (decreasing preload) and via immediate venodilation.

Step-by-Step Solution

1
Analyze the patient's new clinical signs.
The patient has developed orthopnea, elevated jugular venous pressure, an S3 gallop, and bilateral crackles after receiving 4 liters of intravenous fluid.
Identifying these classic physical findings is necessary to recognize the shift from a purely infectious presentation to a volume-overload state.
2
Interpret the arterial blood gas results in clinical context.
The ABG shows hypoxemia and an acute respiratory acidosis (pH=7.32pH = 7.32, pCO2=52 mm HgpCO_2 = 52\text{ mm Hg}), consistent with poor gas exchange.
Pulmonary edema impairs oxygenation and ventilation, leading to hypoxemic respiratory failure and secondary hypercapnia.
3
Select the most appropriate initial intervention based on the diagnosis.
Intravenous loop diuretics (furosemide) are indicated.
Loop diuretics rapidly reduce preload, thereby decreasing pulmonary capillary hydrostatic pressure and relieving pulmonary edema.

Key Concept

Diagnosis and management of iatrogenic acute decompensated heart failure following aggressive fluid resuscitation for sepsis.
Estimated Time:1m 15s
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Topics

Cardiovascular System

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