Cheyne-Stokes respirations are most closely associated with which pathophysiology?

• A. Acute Bronchitis
• B. Brainstem Injury
• C. Severe Asthma
• D. Pulmonary Embolism

Answer: (B)

Cheyne-Stokes respirations reflect disruption of central respiratory control. They present as a cycle of increasing and decreasing tidal volume followed by a brief pause in breathing, caused by instability in the brain’s respiratory centers and a delayed or abnormal feedback response to CO2 levels. This pattern is classically associated with central nervous system insults, including brain injuries that involve the brainstem or bilateral cerebral involvement, where the brain’s automatic drive to breathe becomes irregular.

Pulmonary conditions like acute bronchitis or severe asthma produce airway obstruction and expiratory airflow limitations with different breathing patterns (often fast, shallow, wheezed or productive respirations) rather than the cyclical waxing and waning pattern with a central apnea seen in Cheyne-Stokes. A pulmonary embolism leads to rapid, shallow breathing and hypoxemia from vascular causes, not from central rhythm disruption. So, the finding points to brain injury as the best explanation for this respiratory pattern.