Which breathing pattern is irregular and associated with severe brain injury?

• A. Cheyne-Stokes Respirations
• B. Cushing Triad
• C. Raccoon Eyes
• D. Ataxic (Biot) Respirations

Answer: (D)

Irregular, unpredictable breathing with varying depth and rate, often with periods of apnea, is ataxic (Biot) respirations. This pattern points to severe brainstem injury, typically involving the medulla, where the automatic control of breathing is compromised. Cheyne‑Stokes respirations, in contrast, show a regular waxing and waning crescendo‑decrescendo with pauses, not the chaotic irregularity described here. The Cushing triad isn’t a breathing pattern but a cluster of signs—hypertension with wide pulse pressure, bradycardia, and irregular respirations—reflecting severe intracranial pressure rather than a distinct respiration rhythm. Raccoon eyes are periorbital bruising, an injury sign unrelated to a breathing pattern.