Cheyne-Stokes respirations are caused by instability in the body’s breathing control system, most commonly triggered by heart failure or brain injury. The hallmark pattern, a rhythmic cycle of breathing that gradually deepens, then fades to a complete pause before starting again, results from delayed or exaggerated signals between the lungs, blood, and brain. Each full cycle typically lasts 60 to 90 seconds.
How the Breathing Control Loop Breaks Down
Your body constantly adjusts breathing based on carbon dioxide (CO2) levels in the blood. Chemoreceptors, sensors near the brainstem and in the neck arteries, detect rising CO2 and tell the brain to breathe faster and deeper. When CO2 drops, the signal weakens and breathing slows. This feedback loop normally keeps blood gases stable with only tiny corrections.
Cheyne-Stokes breathing develops when this loop overreacts. Researchers describe the system using a concept called “loop gain,” which is essentially the ratio of the body’s response to a disturbance compared to the size of the disturbance itself. When loop gain is less than 1, any hiccup in breathing gets smoothed out and ventilation returns to normal. When loop gain reaches 1 or higher, each correction overshoots, producing a bigger disturbance than the one it was trying to fix. The result is a self-perpetuating cycle: the brain drives a burst of deep breathing that blows off too much CO2, then breathing pauses until CO2 climbs back up, then the brain overcompensates again.
Two factors feed into loop gain. One is “controller gain,” which is how aggressively the chemoreceptors respond to CO2 changes. The other is “plant gain,” which is how efficiently the lungs actually change blood gas levels for a given amount of ventilation. When either or both are abnormally high, the system becomes unstable and oscillations appear.
Heart Failure Is the Most Common Cause
Heart failure is by far the leading trigger for Cheyne-Stokes breathing. In patients with severe heart failure, roughly 62% show the pattern during sleep and about 16% show it during waking hours as well. Several features of a failing heart destabilize the breathing loop simultaneously.
First, a weak heart pumps blood slowly. This increases the transit time between the lungs (where gas exchange happens) and the chemoreceptors (where CO2 is measured). By the time the brain registers that CO2 has dropped from a round of deep breathing, the lungs have already been overventilating for several extra seconds, pushing CO2 even lower than intended. The delay turns what should be a small correction into a large overshoot.
Second, heart failure often causes fluid to accumulate in and around the lungs. This congestion makes the lungs more efficient at changing blood gas levels per breath, raising plant gain. Research published in the Journal of the American Heart Association found that plant gain is the dominant factor driving daytime Cheyne-Stokes severity in heart failure patients, while both plant gain and heightened chemoreceptor sensitivity contribute at night.
Third, many heart failure patients have chronically low CO2 levels because their bodies are already hyperventilating to compensate for poor circulation. When baseline CO2 sits close to the threshold that triggers a breathing pause, even a small dip can cross that line and produce a full apnea.
Prognostic Implications
The presence of Cheyne-Stokes breathing in heart failure is not just a curiosity. It signals worse outcomes. A study in Circulation found that heart failure patients with frequent breathing pauses (30 or more per hour) had a two-year cardiac mortality of 50%, compared to 26% in those with fewer events. In a multivariate analysis, the frequency of these breathing disturbances was the strongest independent predictor of cardiac death, even stronger than other markers of heart function.
Brain Injury and Neurological Conditions
Cheyne-Stokes breathing has long been recognized as a sign of brain damage, particularly bilateral or deep-seated injuries. The breathing pattern originates from disrupted signaling in the parts of the nervous system that regulate respiration. These include structures in the midbrain, the thalamus region, and several areas of the cortex including the frontal, sensory-motor, and insular regions.
Stroke is a well-documented trigger. In one study of stroke patients, 59% of those with damage above the brainstem and 40% of those with damage below it developed Cheyne-Stokes breathing. Interestingly, the pattern was not confined to any single stroke location, suggesting that widespread disruption of respiratory control networks, rather than damage to one specific spot, is what matters. Other neurological causes include traumatic brain injury, brain tumors, and advanced dementia, all of which can impair the brain’s ability to fine-tune breathing in response to CO2 fluctuations.
High Altitude and Healthy People
You don’t need a diseased heart or an injured brain to develop periodic breathing. Healthy climbers and travelers commonly experience it at high altitude, especially during sleep. The mechanism starts with low oxygen levels in thin mountain air. Your body responds by breathing harder, which drives down CO2. Over hours to days, this “ventilatory acclimatization” progressively increases breathing rate and lowers CO2 further, pushing baseline levels closer to the apnea threshold.
At the same time, low oxygen enhances chemoreceptor sensitivity, raising loop gain. The combination of a heightened controller response and a CO2 baseline hovering near the pause threshold creates the same oscillating pattern seen in heart failure patients. The severity of periodic breathing at altitude increases with both the duration and the intensity of the exposure. For most people, it resolves after descent or after full acclimatization.
Other Contributing Factors
Beyond heart failure, stroke, and altitude, several other conditions can push the breathing feedback loop toward instability. Kidney failure can alter blood chemistry in ways that sensitize chemoreceptors. Opioid medications suppress the brainstem’s respiratory drive, which can unmask periodic breathing patterns during sleep. Chronic use of sedatives or sleeping pills may have a similar, though less pronounced, effect.
Sleep itself is also a factor. The transition from wakefulness to light sleep naturally reduces the brain’s responsiveness to CO2, and the “wakefulness drive” that keeps breathing steady disappears. This is why Cheyne-Stokes breathing is often most prominent during lighter stages of sleep and tends to diminish during deeper sleep, when the body’s breathing rhythm stabilizes through different mechanisms.
How It Is Identified
Cheyne-Stokes breathing is formally diagnosed through an overnight sleep study. The American Academy of Sleep Medicine requires at least three consecutive central apneas or hypopneas separated by the characteristic waxing-and-waning breathing pattern, with each cycle lasting at least 40 seconds. There also need to be at least five such events per hour of sleep, documented over at least two hours of monitoring. The crescendo-decrescendo shape on the airflow tracing is what distinguishes it from other forms of central sleep apnea, which tend to have shorter, more irregular cycles.
Treatment Depends on the Underlying Cause
Because Cheyne-Stokes breathing is almost always a symptom of something else, treatment starts with addressing the root condition. In heart failure patients, optimizing cardiac function with medications, devices, or surgical interventions often reduces or eliminates the breathing pattern. Weight loss, fluid management, and sleeping with the head elevated can also help by reducing lung congestion and lowering plant gain.
When the pattern persists despite optimal heart failure treatment, positive airway pressure therapy may be considered. A specialized device called adaptive servo-ventilation (ASV) continuously adjusts air pressure breath by breath to smooth out the oscillations. A 2025 European Respiratory Society statement supports ASV use in heart failure patients whose hearts still pump reasonably well (ejection fraction between 30% and 45%), but only after standard treatment and a trial of simpler continuous positive airway pressure. In patients with very weak hearts, ASV is reserved for symptom relief in a palliative context, since earlier research raised safety concerns in that population.
For altitude-related periodic breathing, supplemental oxygen or medications that stimulate breathing and raise baseline CO2 are sometimes used during acclimatization. For neurological causes, treatment focuses on the underlying brain condition, and the breathing pattern may improve as the injury stabilizes or heals.