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Difficulty: EasyPulmonary and Critical Care

A 62-year-old woman is evaluated in the outpatient clinic for a 3-day history of worsening shortness of breath, increased cough, and a change in sputum color from clear to dark yellow. She has a history of chronic obstructive pulmonary disease (COPD) and typically uses an albuterol inhaler as needed. Her temperature is 37.4°C (99.3°F), blood pressure is 130/82 mm Hg, pulse is 96/min, and respirations are 20/min. Pulse oximetry is 93% on room air. Physical examination reveals a barrel-shaped chest and a prolonged expiratory phase with scattered bilateral wheezing. There is no jugular venous distention, and no lower extremity edema is present. In addition to optimizing her bronchodilator therapy and initiating a short course of oral corticosteroids, which of the following is the most appropriate next step in management?

  1. Prescribe oral azithromycinAnswer
  2. B
    Administer intravenous furosemide
  3. C
    Order a serum brain natriuretic peptide level
  4. D
    Initiate intravenous vancomycin and piperacillin-tazobactam
  5. E
    Obtain an arterial blood gas to calculate expected metabolic compensation

Answer

Prescribe oral azithromycin
This patient is experiencing an acute exacerbation of chronic obstructive pulmonary disease (COPD). The decision to use antibiotics is based on the presence of cardinal symptoms: increased dyspnea, increased sputum volume, and increased sputum purulence. Since this patient has worsening shortness of breath and increased sputum purulence (color change to dark yellow), antibiotics are indicated. For an outpatient with an uncomplicated exacerbation, appropriate empiric oral options include macrolides (e.g., azithromycin), advanced macrolides, cephalosporins, or doxycycline. This targets the most common pathogens, including Haemophilus influenzae, Moraxella catarrhalis, and Streptococcus pneumoniae.

Step-by-Step Solution

1
Identify the primary clinical syndrome from the patient's presentation.
The patient has worsening dyspnea, increased cough, and increased sputum purulence (dark yellow sputum) on a background of COPD, which defines an acute exacerbation of COPD.
Recognizing the cardinal symptoms of a COPD exacerbation dictates the need for specific therapeutic interventions.
2
Determine the indications for antibiotic therapy in this setting.
Antibiotics are indicated for COPD exacerbations if the patient has all three cardinal symptoms (increased dyspnea, increased sputum volume, and increased sputum purulence) or two symptoms if one of them is increased sputum purulence.
This patient meets the criteria (increased dyspnea, increased sputum purulence, increased cough/volume), requiring antibiotic therapy.
3
Select the appropriate antibiotic class and setting.
For an uncomplicated outpatient exacerbation, a macrolide (e.g., azithromycin), cephalosporin, or doxycycline is the preferred oral treatment.
These agents provide adequate coverage against common respiratory pathogens like Haemophilus influenzae, Moraxella catarrhalis, and Streptococcus pneumoniae without overly broad spectrum effects.

Key Concept

Indications for antibiotics in acute COPD exacerbations
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Topics

Pulmonary and Critical Care

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