What Is Cheyne-Stokes Breathing? Causes and Prognosis

Cheyne-Stokes breathing is a distinctive respiratory pattern in which breaths gradually grow deeper and faster, peak, then taper off until breathing stops entirely for several seconds, before the cycle starts again. It was first described in the nineteenth century by two physicians, John Cheyne and William Stokes, and it remains one of the most recognizable abnormal breathing patterns in clinical medicine.¹ It most often appears in people with heart failure or serious brain injury, but it can also show up at high altitude, with chronic opioid use, and in the final hours of life.

What It Looks and Feels Like

The hallmark is a crescendo-decrescendo rhythm: breathing gradually ramps up in both depth and speed, hits a peak, then winds back down to a complete pause. That pause, called an apnea, can last anywhere from a handful of seconds to half a minute or more. Then the cycle repeats, typically on a loop of about 45 seconds to two minutes. People with heart failure may cycle through this pattern dozens or hundreds of times per night. In one pediatric case report, a sleep study recorded 373 central breathing events in a single night, averaging roughly 47 events per hour.²

The person experiencing it is usually asleep or semiconscious and often unaware of what is happening. Bed partners are the ones who notice, and they often describe the pattern as frightening: long stretches of silence when the person appears to have stopped breathing, followed by deep gasps. During the apnea phases, blood oxygen drops, and the body responds with a burst of sympathetic nervous system activity, raising heart rate and blood pressure, particularly during the resumption of breathing.³

Why It Happens

Your body controls breathing through a feedback loop. Sensors in the brainstem and major blood vessels monitor the level of carbon dioxide in your blood. When CO₂ rises, your brain drives you to breathe harder to blow it off. When CO₂ falls, the drive to breathe weakens. Normally this system stays in a narrow, stable range. Cheyne-Stokes breathing is what happens when that feedback loop overshoots.

Researchers describe this instability using a concept called “loop gain,” which is essentially a measure of how aggressively the system corrects itself. When loop gain is high, a small rise in CO₂ triggers an exaggerated breathing response, which blows off too much CO₂, which causes breathing to stall, which lets CO₂ climb again, and the oscillation sustains itself.⁴ One study found that when predicted loop gain was below 0.8, the breathing pattern resolved in every single case tested, but when it exceeded 1.0, the pattern persisted almost every time.⁵

Three things can push loop gain too high. First, the brainstem’s CO₂ sensors can become overly sensitive, so they overreact to small changes. Second, the lungs themselves can become too efficient at exchanging gas relative to the blood volume passing through them, a factor researchers call “plant gain.” In heart failure patients with Cheyne-Stokes breathing, this plant gain was significantly elevated compared to those without the pattern.⁶ Third, blood takes longer to travel from the lungs to the brain in a failing heart, so by the time the brain registers a change in CO₂, the lungs have already over-corrected. That same study found circulation time was the strongest predictor of how long each Cheyne-Stokes cycle lasted.

Heart Failure Is the Leading Cause

Cheyne-Stokes breathing is overwhelmingly associated with congestive heart failure. Roughly half of patients with moderate to severe heart failure develop a significant degree of this breathing pattern.⁷ The mechanism fits neatly: a weakened heart pumps blood sluggishly, lengthening circulation time and creating fluid congestion in the lungs, both of which destabilize breathing control. Nocturnal Cheyne-Stokes breathing in heart failure is also tied to heightened sympathetic nervous system activation, the “fight or flight” wiring that raises heart rate and constricts blood vessels.⁸

This creates a vicious cycle. Heart failure destabilizes breathing, and the unstable breathing stresses the heart further. During each apnea phase, oxygen drops and the sympathetic nervous system fires harder, with nerve activity climbing to about 150% of its baseline level during the second half of each pause. Blood pressure spikes just as breathing resumes.⁹ Night after night, this hammering of the cardiovascular system may accelerate the decline in cardiac function.

Neurological Causes and Stroke

Heart failure gets the most attention, but brain injury is the other classic trigger. The original descriptions by Cheyne and Stokes were in patients with neurological disease, and the link remains strong. The key requirement appears to be bilateral damage to the brain above the level of the brainstem. A study of patients with various neurological conditions found that every person who showed Cheyne-Stokes breathing had signs of bilateral dysfunction in the descending motor pathways that connect the cortex to the respiratory centers below.¹⁰

Stroke is a common example. In patients with acute brainstem infarction, prominent Cheyne-Stokes breathing showed up in those with extensive bilateral pontine lesions, though not every patient with large lesions developed it.¹¹ A broader study of acute ischemic stroke found that Cheyne-Stokes breathing occurred frequently after stroke regardless of where in the brain the stroke occurred, but was more common with bilateral lesions. The researchers found that previous neurological deficits, reduced heart pumping ability, and heart chamber enlargement were better predictors of whether someone developed the pattern than the stroke itself, suggesting underlying cardiovascular dysfunction plays a role even when brain injury is the apparent trigger.¹²

Opioids as a Trigger

After heart failure, chronic opioid use is now the second most common cause of central sleep apnea, which includes Cheyne-Stokes-type breathing. It shows up in roughly a quarter of people who use opioids chronically, typically after more than two months of use, and tends to scale with the dose.¹³ The mechanism is different from heart failure: opioids directly dampen the brainstem’s sensitivity to CO₂, which destabilizes the feedback loop from the other direction. Rather than the sensors being too reactive, they become erratically suppressed, and the system swings between under- and over-breathing. This distinction matters because the treatment approach differs, and recognizing the pattern in opioid users can be a signal that the dose is high enough to compromise breathing during sleep.

Altitude and Healthy People

Cheyne-Stokes-type periodic breathing is not exclusively a sign of disease. Healthy people develop it at high altitude, often starting above about 2,500 meters. The thin air drives harder breathing to compensate for lower oxygen, which blows off CO₂ and pushes it below the threshold that keeps breathing going during sleep. The result is the same oscillating pattern. A recent study of young, healthy men at altitude found something unexpected: the periodic breathing phases actually required less respiratory effort per minute than the periods of regular breathing, with about a 22% reduction in the work of breathing.¹⁴ This suggests the pattern may function as an energy-saving strategy at altitude, not a malfunction. The finding is a reminder that Cheyne-Stokes breathing is not always pathological; context determines whether it is harmful.

The Relationship with Sleep Stages

Cheyne-Stokes breathing is heavily influenced by the stage of sleep. It predominates during lighter sleep stages and deep slow-wave sleep, when breathing is controlled almost entirely by the chemical feedback loop. During REM sleep, by contrast, breathing becomes more erratic and is driven partly by the brain’s dream-related activity, which appears to override the oscillating loop. A case study of a stroke patient found that classic Cheyne-Stokes breathing dominated during non-REM sleep, while REM sleep was associated almost exclusively with normal breathing.¹⁵ This is why people with Cheyne-Stokes breathing may feel somewhat better after naps that are too short to involve extended non-REM cycling, and why the pattern tends to worsen during the consolidated sleep of the early night, when slow-wave sleep is most abundant.

What It Means for Prognosis

Whether Cheyne-Stokes breathing independently worsens outcomes in heart failure or simply reflects how sick the heart already is has been debated for decades. The evidence leans toward “both.” One study that followed heart failure patients over several years found significantly more deaths in the group that developed Cheyne-Stokes breathing during sleep, and concluded the pattern itself may accelerate cardiac decline, not just mirror it.¹⁶

There is an important distinction between when the pattern appears. Cheyne-Stokes breathing limited to nighttime sleep does not appear to carry strong independent prognostic weight on its own. But when it spills over into wakefulness and is present during the daytime, the picture is much grimmer. One study found that daytime Cheyne-Stokes breathing in heart failure patients suggested a high likelihood of dying within months.¹⁷ Daytime appearance signals that the feedback instability has become so severe that even the waking brain’s ability to stabilize breathing is insufficient.

Treatment Has Proven Difficult

Treating Cheyne-Stokes breathing sounds straightforward in theory: fix the heart failure, stabilize the feedback loop, or mechanically support breathing during sleep. In practice, the results have been humbling. The most consequential trial in this space, SERVE-HF, tested adaptive servo-ventilation (ASV), a sophisticated breathing machine that detects the oscillating pattern and adjusts air pressure breath by breath to smooth it out. The device eliminated the breathing abnormality effectively. But in heart failure patients with reduced pumping ability, the group receiving ASV had higher death rates than the control group, with about a 34% increase in cardiovascular death.¹⁸ That result sent shockwaves through the sleep medicine community and led to a contraindication for ASV in this patient population.

Subsequent trials have softened the picture somewhat without fully rehabilitating ASV. The CAT-HF trial found no benefit from ASV overall in hospitalized heart failure patients, though a pre-specified subgroup analysis hinted at possible benefit in patients whose hearts still pumped relatively well.¹⁹ The more recent ADVENT-HF trial, using a different ASV algorithm, found no effect on the combined outcome of death and cardiovascular hospitalization over a mean follow-up of about three and a half years, and no safety signal emerged.²⁰ The bottom line as the field currently stands: mechanically eliminating the breathing pattern does not clearly help and may hurt in certain patients, which has forced a rethink about whether the pattern is purely harmful or whether it might serve some protective function in some settings.

Medications have shown more modest results. Acetazolamide, a drug that changes acid-base balance in the blood, reduced central apneas in heart failure patients and improved overnight oxygen levels, apparently by blunting the overshoot in the feedback loop.²¹ But it came with a trade-off: exercise capacity dropped somewhat, and it has not been tested in large outcome trials. Supplemental oxygen and optimizing heart failure medications remain the most common first-line approaches, with the logic that improving cardiac output addresses the root cause rather than papering over a symptom.

Cheyne-Stokes Breathing at End of Life

Outside the heart failure clinic, the setting where people most often encounter Cheyne-Stokes breathing is the deathbed. The pattern is one of several respiratory changes that typically appear in the last three days of life for people dying of cancer and other terminal illnesses. In a study of dying cancer patients, Cheyne-Stokes breathing had a specificity above 95% for death occurring within three days, making it one of the most reliable physical signs that the end is near.²² It tends to appear alongside other late signs like peripheral cyanosis, loss of a pulse at the wrist, and decreased urine output.

For family members keeping vigil, witnessing the pattern is deeply distressing. The long pauses trigger repeated moments of uncertainty about whether the person has died, followed by startling gasps when breathing resumes. A study of hospice caregivers found that witnessing Cheyne-Stokes breathing, along with death rattle and agonal breathing, caused significant distress, and that hospice agencies could do more to prepare families for what they would see and hear.²³ Knowing in advance that the waxing and waning breathing is a natural part of the dying process, not a sign of suffering or suffocation, can make the vigil somewhat more bearable.

Periodic Breathing in Newborns

Premature and newborn infants frequently display a breathing pattern that looks like Cheyne-Stokes breathing but is driven by different mechanisms. This neonatal periodic breathing involves alternating clusters of breaths and pauses and is considered a normal pattern in healthy young infants.²⁴ The regulatory mechanisms behind it are quite different from those in adults and in some respects appear paradoxical compared to the classic loop-gain model. In premature infants, the immature brainstem has not yet developed the tight CO₂ sensitivity that adult respiratory centers have, so breathing control is inherently wobbly. Most infants outgrow the pattern within the first several months of life as their brainstem matures. The key clinical distinction is between periodic breathing, which is benign and self-resolving, and apnea of prematurity, which involves longer pauses and may require intervention.

Automated Detection and the Future of Diagnosis

Diagnosing Cheyne-Stokes breathing currently requires a sleep study, typically a polysomnogram or cardiorespiratory polygraph, where trained technicians visually score the crescendo-decrescendo patterns on respiratory tracings. This process is time-consuming and somewhat subjective. Recent work has explored using machine learning to automate detection. A transformer-based neural network trained on over 500 sleep recordings, scored by three certified sleep technicians, achieved a performance score (F1 of 0.76) close to that of human scorers.²⁵ Automated detection could make screening easier, especially in heart failure populations where the prevalence is high and routine sleep studies are not always performed. If wearable devices or home-monitoring systems can eventually flag the pattern reliably, it could serve as an early warning that heart failure is worsening, prompting medication adjustments before a hospitalization becomes necessary.