A 68-year-old male with COPD undergoes elective abdominal surgery under general anesthesia with endotracheal intubation. Post-extubation, he develops stridor and dyspnea within 2 hours. Which is the most common cause of post-extubation stridor in this patient?

Explanation

## Post-Extubation Stridor: Etiology & Timing **Key Point:** Post-extubation stridor occurring within hours of tube removal is most commonly due to laryngeal edema, a predictable inflammatory response to endotracheal tube trauma. ### Pathophysiology of Laryngeal Edema Endotracheal intubation causes direct mucosal trauma to the larynx and subglottic region. The inflammatory cascade results in: - Mucosal edema and swelling - Narrowing of the subglottic airway (narrowest part in adults) - Stridor (typically inspiratory) - Onset: minutes to 2 hours post-extubation ### Incidence & Risk Factors | Feature | Details | |---------|----------| | **Incidence** | 1–4% of intubated patients | | **Peak onset** | 30 min – 2 hours post-extubation | | **Risk factors** | Prolonged intubation (>24 hrs), large tube size, difficult intubation, female sex, age >50, COPD | | **Duration** | Usually self-limited; resolves in 24–72 hours | **High-Yield:** Laryngeal edema is the most common cause of immediate post-extubation stridor. It is a diagnosis of exclusion after ruling out other acute causes. ### Management Approach 1. Oxygen supplementation 2. Nebulized epinephrine (racemic or L-epinephrine 0.5 mg in 3 mL saline) 3. IV dexamethasone (8 mg) to reduce inflammation 4. Observation; most resolve spontaneously 5. Re-intubation if airway obstruction worsens **Clinical Pearl:** In a patient with risk factors (prolonged intubation, difficult airway, age >50), post-extubation stridor is laryngeal edema until proven otherwise. ### Differential Timing | Cause | Onset | Stridor Type | Chronicity | |-------|-------|--------------|------------| | **Laryngeal edema** | Minutes–2 hrs | Inspiratory | Acute, self-limited | | **Vocal cord paralysis** | Immediate or delayed | Inspiratory (unilateral) | Persistent | | **Tracheal stenosis** | Days–weeks | Biphasic | Chronic | | **Laryngospasm** | Immediate | Stridor + apnea | Transient (seconds) | [cite:Stoelting's Anesthesia and Co-Existing Disease Ch 2]