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Sudden chest pain and dyspnea during decompression suggest pneumothorax due to gas expansion. This is a medical emergency requiring chest tube or needle decompression before continuing.

NFPA 99: Health Care Facilities Code outlines fire safety and operational standards for hyperbaric facilities. This includes chamber construction, oxygen system requirements, and emergency procedures.

Patients with severe COPD may rely on hypoxic drive for respiration. High oxygen levels can blunt this drive, causing CO₂ retention (hypercapnia). Careful assessment and monitoring are needed.

HBO increases pressure, reducing bubble size (Boyle’s Law), and provides 100% oxygen, creating steep nitrogen gradients for faster elimination (Henry’s Law). Together, these effects restore circulation and oxygen delivery. This is the primary rationale for HBO in decompression sickness.

Patients with poorly controlled seizures have lower thresholds for CNS oxygen toxicity. Stabilization and medication adjustments are required before starting HBO to reduce risks.