Stroke and Pneumonia Risk: Mechanisms and Prevention

Stroke survivors have a 2–3× higher risk of pneumonia than age-matched controls. Pneumonia is a leading cause of post-stroke mortality.

Mechanisms

• Dysphagia: 40–70% of acute stroke patients have impaired swallowing → aspiration of oropharyngeal secretions/food.
• Impaired Cough Reflex: Brainstem/cortical lesions reduce airway clearance.
• Immobility: Atelectasis, stasis of secretions.
• Immunosuppression: Stroke-induced immunodepression (SIDS) – reduced T-cells, monocytes, cytokine shifts.
• Hospitalization: Exposure to nosocomial pathogens; ventilator-associated pneumonia (VAP) if intubated.

Prevention Strategies

• Early Dysphagia Screening: Bedside swallow eval (e.g., 3-oz water test) before oral intake; instrumental (VFSS, FEES) if failed.
• Texture-Modified Diet & Thickened Liquids: Per SLP recommendations.
• Oral Hygiene: Chlorhexidine, toothbrushing q12h – reduces oral bacterial load.
• Mobilization: Early OT/PT; sitting, standing, walking.
• Head-of-Bed Elevation: 30–45° during/after meals.
• Vaccinations: Pneumococcal (PCV20/PPSV23), annual influenza, COVID-19.
• Prophylactic Antibiotics: Not routinely recommended (resistance risk); selective use in high-risk subgroups.

Integrated stroke unit care with dedicated dysphagia management reduces pneumonia incidence by 30–50%.