On the fourth day after undergoing an uncomplicated sigmoid colectomy for recurrent divert… — USMLE Step 2 CK

On the fourth day after undergoing an uncomplicated sigmoid colectomy for recurrent diverticulitis, a 68-year-old man is assessed for new-onset breathing difficulties. Over the past 12 hours, he has developed progressive shortness of breath accompanied by a cough producing thick, yellow sputum. His medical history includes chronic obstructive pulmonary disease (COPD) and heart failure with preserved ejection fraction.

Vital signs are:
Temperature: $38.2^\circ\text{C}$ ( $100.8^\circ\text{F}$ )
Blood pressure: $135/85\text{ mmHg}$
Heart rate: $108/\text{min}$
Respiratory rate: $24/\text{min}$
Oxygen saturation: $88\%$ on room air

Physical examination reveals a patient in mild respiratory distress using accessory muscles of respiration. Auscultation of the lungs demonstrates a prolonged expiratory phase with diffuse, bilateral wheezing. Jugular venous pressure is normal, and there are no crackles or lower extremity edema. The abdomen is soft, non-distended, and mildly tender around the surgical incision, but lacks guarding or rebound tenderness. The incision is intact with no erythema or purulent drainage.

Laboratory and imaging results:
Leukocyte count: $11,500/\text{mm}^3$
Brain natriuretic peptide (BNP): $85\text{ pg/mL}$ (Normal: $<100\text{ pg/mL}$ )
Procalcitonin: $0.05\text{ ng/mL}$ (Normal: $<0.15\text{ ng/mL}$ )
Chest radiograph: Hyperinflated lungs and flattened hemidiaphragms; no focal consolidations, pleural effusions, or vascular congestion

Which of the following are the most appropriate next steps in the management of this patient? (Select 2)

Administer inhaled ipratropium and albuterolAnswer
B
Obtain a computed tomography scan of the abdomen and pelvis
C
Administer intravenous furosemide
Administer systemic glucocorticoidsAnswer
E
Initiate broad-spectrum intravenous antibiotics

Answer

The most appropriate next steps are to administer inhaled ipratropium and albuterol, and to administer systemic glucocorticoids.

This patient's clinical presentation (dyspnea, productive cough, wheezing, prolonged expiratory phase, low-grade fever) and history of chronic obstructive pulmonary disease (COPD) are highly consistent with an acute COPD exacerbation. In the postoperative period, factors such as altered respiratory mechanics, pain, and fluid shifts can precipitate an exacerbation. The normal brain natriuretic peptide (BNP), absence of jugular venous distention, clear lung bases (no crackles), and lack of vascular congestion on the chest radiograph strongly point against acute decompensated heart failure. Furthermore, the benign abdominal examination makes an intra-abdominal surgical complication unlikely. The cornerstone of management for an acute COPD exacerbation includes short-acting inhaled bronchodilators (e.g., albuterol, ipratropium) to relieve bronchospasm and systemic glucocorticoids to rapidly reduce airway inflammation.

Step-by-Step Solution

Evaluate the patient's acute respiratory distress and fever on postoperative day 4.

The patient exhibits a productive cough, wheezing, low-grade fever, and hypoxemia.

To establish the primary clinical problem requiring intervention.

Differentiate between a pulmonary exacerbation and acute decompensated heart failure using laboratory and imaging data.

Normal BNP, clear lung bases without crackles, and absence of vascular congestion on radiography rule out heart failure, while the history of COPD and expiratory wheezing confirm a COPD exacerbation.

Heart failure and COPD exacerbations can present similarly with dyspnea, particularly in the postoperative setting following fluid resuscitation, but they require entirely different treatments.

Select the appropriate pharmacologic therapies for an acute COPD exacerbation while avoiding overly aggressive or unnecessary measures.

Treatment includes short-acting inhaled bronchodilators and systemic glucocorticoids.

These interventions directly address the underlying bronchospasm and airway inflammation causing the patient's acute symptoms.

Key Concept

Patients who develop postoperative dyspnea must be carefully evaluated to differentiate COPD exacerbations from acute decompensated heart failure. An acute COPD exacerbation is managed with short-acting bronchodilators and systemic glucocorticoids.

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