Respiratory Polio: Bulbar & Spinal Paralysis, Ventilation & Prevention

Respiratory polio—poliovirus infection of brainstem respiratory centers and/or spinal motor neurons innervating diaphragm/intercostals—is the most lethal form of paralytic poliomyelitis.

Pathophysiology

• Bulbar polio: Medullary respiratory center destruction → central apnea, autonomic instability (BP lability, arrhythmia).
• Spinal respiratory polio: Anterior horn cell loss at C3–C5 (phrenic) and T1–T12 (intercostals) → ventilatory failure.
• Combined: Most fatal cases involve both.

Clinical Presentation

• Prodrome: Fever, headache, nuchal rigidity (aseptic meningitis picture).
• Paralytic phase: Asymmetric flaccid weakness, areflexia, fasciculations.
• Respiratory failure: Dyspnea, paradoxical breathing, hypercapnia, cyanosis.
• Bulbar signs: Dysphagia, dysarthria, nasal regurgitation, weak cough.

Management

1. Mechanical ventilation: Iron lung (historical) → modern ICU ventilation (volume/pressure control).
2. Supportive: Secretion management, nutrition, DVT prophylaxis, infection prevention.
3. Rehabilitation: Early mobilization, respiratory muscle training, orthotics.
4. No antiviral: Poliovirus has no specific treatment.

Prevention & Global Status

• IPV (inactivated): 4-dose series (2,4,6–18 mo, 4–6 yr) — standard in US.
• OPV (oral): Used in eradication campaigns; rare VAPP (vaccine-associated paralytic polio).
• Global eradication: WPV1 endemic only in Afghanistan/Pakistan (2024); cVDPV outbreaks in underimmunized areas.
• Travelers: Booster if to endemic/outbreak areas.

Polio is preventable. Vaccination maintains elimination in certified regions.