Cheyne-Stokes respirations are most commonly associated with which condition?

• A. Increased intracranial pressure.
• B. Anaphylaxis.
• C. Pulmonary edema.
• D. Hyperventilation syndrome.

Answer: (A)

Cheyne-Stokes respirations reflect unstable central control of breathing, usually from brain injury or altered cerebral perfusion. The pattern is cyclic: a gradually increasing then decreasing tidal volume followed by a brief pause (apnea). This waxing and waning occurs when the brain’s respiratory centers are destabilized, most commonly in the setting of increased intracranial pressure. That elevated pressure disrupts normal brainstem regulation, so the breathing rhythm becomes this characteristic crescendo–decrescendo pattern with pauses.

Anaphylaxis causes airway edema and shock, with rapid, irregular breathing rather than a repeating cyclical pattern. Pulmonary edema leads to severe shortness of breath and crackles from fluid overload, not the classic Cheyne-Stokes cycle. Hyperventilation syndrome presents with fast, deep breaths due to anxiety, again not the cyclic pattern described.