Is cheyne stokes respiration , a irregular breathing or a rhythmic breathing?

Irregular breathing: Abnormal breathing pattern marked by progressively deeper & sometimes faster breathing, followed by a gradual decrease that results in temporary stop in breathing. Seen in heart failure, strokes, traumatic brain injuries, brain tumors; carbon monoxide poisoning; sometimes after morphine is given; can be seen in healthy people during sleep at high altitude.

Cyclic pattern: Cheyne-stokes breathing is characterized by shallow breathing with progressively deeper breaths and sometimes faster breaths, followed by shallower breathing and finally complete cessation of breaths (apnea). This cycle repeats. The patient must have apnea between cycles for it to be considered cheyne-stokes.