The Protective Benefits of Coughing: Airway Defense Mechanism
Coughing is a **vital defensive reflex** that clears the airways of mucus, irritants, pathogens, and foreign material.
Mechanism
- Irritation: Stimulates cough receptors (larynx, trachea, bronchi).
- Inspiration: Deep breath (↑ volume).
- Compression: Glottis closes; expiratory muscles contract → intrathoracic pressure ↑.
- Expulsion: Glottis opens → high-velocity airflow (up to 500 mph) shears mucus/particles.
Benefits
- Mucus Clearance: Prevents stasis, infection, atelectasis.
- Pathogen Removal: Expels bacteria/viruses before deep invasion.
- Foreign Body Ejection: Aspirated particles.
- Reflex Protection: Prevents aspiration (laryngeal cough reflex).
When Cough Is Problematic
- Chronic (>8 weeks): investigate cause (GERD, UACS, asthma, ACEi, TB, cancer).
- Hemoptysis, weight loss, fever, dyspnea → urgent eval.
- Disrupts sleep, causes syncope, rib fracture, urinary incontinence.
Management
Treat underlying cause. Symptomatic: honey (evidence-based), guaifenesin (mucolytic), dextromethorphan (suppressant—avoid if productive), throat lozenges. Avoid OTC cough/cold in children <6.
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