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How Sleep Apnea Affects Blood Pressure

Written by Tochukwu Ikpeze Staff Writer
Reviewed by Gerard Meskill Medical Reviewer
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Medical Disclaimer: This content is for informational purposes and does not constitute medical advice. Please consult a health care provider prior to starting a new treatment or making changes to your treatment plan.

Obstructive sleep apnea (OSA) is associated with a number of potential health complications, including high blood pressure. Blood pressure is the amount of force generated by blood pushing against the walls of your arteries. 

High blood pressure, also known as hypertension, can lead to damage to your arteries and vital organs, including your heart. If left untreated, hypertension can raise your risk of stroke, heart attack and other heart diseases, as well as other serious medical problems. Over 45% of American adults are estimated to have hypertension. 

Many factors, including your diet, hormone levels, and other health problems can affect your blood pressure. Experts have also identified strong links between hypertension and obstructive sleep apnea. Fortunately, evidence suggests that, in addition to improving sleep, treating OSA may help lower blood pressure.  

Learning more about the connection between obstructive sleep apnea and high blood pressure can help you understand the health issues associated with OSA and how effective treatment for OSA can improve your overall wellness.

What Is Cheyne-Stokes Breathing?

Cheyne-Stokes breathing is a condition that involves periods of heavy and rapid breathing that alternate with periods of shallow or absent breaths. This breathing pattern is usually associated with an underlying health condition. Cheyne-Stokes breathing is found in up to 50% of people with heart failure and 50% of people after a stroke.

Although Cheyne-Stokes breathing can happen while a person is awake, it most often occurs during sleep. When this breathing pattern during sleep is accompanied by pauses in breath, it is diagnosed as a type of central sleep apnea. Around half of people with central sleep apnea experience Cheyne-Stokes breathing after falling asleep.

Why Do Cheyne-Stokes Respirations Happen?

Experts believe that Cheyne-Stokes breathing happens because of a delay in the brain’s detection of the level of carbon dioxide in the blood. This delay throws off the normal pace of breathing.

Breathing is the body’s way of taking in oxygen and releasing carbon dioxide. During sleep, breathing is regulated by a part of the brain called the respiratory center. The respiratory center receives signals from cells within the arteries about the levels of oxygen and carbon dioxide in the blood. The brain uses these signals to control the muscles involved in breathing.

In Cheyne-Stokes respirations, a delay in these signals limits the brain’s ability to maintain a steady rate of breathing. Breathing becomes rapid to reduce carbon dioxide in the blood but overcorrects, and this causes an abnormally low level of carbon dioxide. In response, breathing slows or stops, overcorrecting once again and restarting the cycle.

Can Sleep Apnea Cause High Blood Pressure?

While obstructive sleep apnea may contribute to high blood pressure, evidence to date shows only a correlation, not causation. This means that, though studies have found a clear association between these conditions, researchers are still learning about the ways in which OSA may lead to hypertension.

Around 50% of people with OSA also have hypertension. Studies suggest that the likelihood of having high blood pressure corresponds to the severity of OSA. Additionally, people with untreated OSA are at a greater risk of developing hypertension, even if their blood pressure was normal before being diagnosed with OSA. 

Obstructive sleep apnea is often diagnosed in people who have hypertension that persists despite taking medications to reduce blood pressure. It is believed that as many as 71% of people with this kind of treatment-resistant high blood pressure also have OSA.

How Sleep Apnea Causes High Blood Pressure

While further research is needed to prove that OSA causes high blood pressure, experts suggest that there are several ways in which OSA may affect a person’s risk of developing high blood pressure. 

OSA is characterized by fragmented sleep from recurrent brief arousals that reinitiate normal breathing. Repetitive partial or complete collapse of the upper airway, is also associated with a decrease in the amount of oxygen in the blood, changes in pressure within the chest, and increased activity in the central nervous system.

These stressors can trigger changes in metabolism, the immune system, and the nervous system. There are multiple mechanisms through which these effects of OSA may lead to elevated blood pressure.

  • Inflammation: Inflammation is a normal aspect of how the immune system protects the body, but it can harm the heart and blood vessels if inflammation lasts too long. Recurring drops in oxygen levels and increased central nervous system activation from OSA can contribute to persistent inflammation that may lead to high blood pressure.
  • Nighttime blood pressure: Usually, blood pressure naturally dips during sleep. But in people with OSA, blood pressure may not decrease during rest. Missing out on these natural dips in blood pressure may contribute to the risk of hypertension. 
  • Heart rate changes: During healthy sleep, a person’s heart rate gradually slows as part of the body’s process of rest and recovery. OSA disrupts the normal pattern of heart rate changes during sleep, which may help explain why OSA is linked to various cardiovascular problems.

It’s also important to recognize that blood pressure can be influenced by a wide range of other issues. For example, a person’s diet, age, stress level, family history, hormones, and the condition of the kidneys are just a few things that can impact whether a person develops hypertension.

Health Complications of Sleep Apnea and High Blood Pressure

Without appropriate treatment, OSA and high blood pressure can have serious health consequences. 

OSA may cause excessive daytime sleepiness and can heighten the risk of car accidents. Untreated OSA is also linked with cardiovascular problems that are similar to those caused by high blood pressure.

Hypertension puts added stress on the walls of the arteries and can cause harm to the heart and kidneys. When it goes unaddressed, high blood pressure can increase the likelihood of having a stroke, heart attack, kidney failure, and heart disease.

Effect of Sleep Apnea Treatment on Blood Pressure

Treatment of OSA reduces breathing disruptions during sleep, which can not only improve sleep quality but also reduce blood pressure.

A common treatment for OSA involves using a continuous positive airway pressure (CPAP) device. To use a CPAP, a sleeper wears a mask over their nose or nose and mouth, allowing a constant flow of pressurized air to enter the upper airway to keep it from collapsing during sleep. 

Studies have found that using a CPAP regularly can also help lower blood pressure. In people without high blood pressure, CPAP therapy may prevent the development of hypertension.

In addition, effective treatment for OSA with a CPAP machine may offer significant benefits in people with high blood pressure who already take blood pressure medications. In some cases, using a CPAP machine while also taking blood pressure medications may offer the most significant reductions in blood pressure. 

These health benefits can be maintained over the long-term as long as people continue to use the CPAP machine. In contrast, blood pressure can go back up within just two weeks if a person with obstructive sleep apnea stops using the CPAP device as directed. 

Fewer studies have looked at the effects of other treatments for OSA on hypertension, but there are indications that they may help decrease blood pressure. 

For example, oral appliance therapy involves wearing a specially fitted device in the mouth during sleep. The device helps keep a sleeper’s jaw and tongue forward, which limits airway narrowing during sleep. Evidence suggests that, like CPAP, oral appliance therapy can help lower blood pressure.

Less often, OSA may be treated with surgery to allow for better airflow. The most common surgery for OSA realigns the jaw bone with the skull. Other surgical options involve modifying tissue in the nose or throat that can narrow the airway. When medically appropriate, surgery may help address OSA and positively affect blood pressure.

Lifestyle Changes to For Sleep Apnea and High Blood Pressure

Depending on the cause of OSA and hypertension, there may be lifestyle changes that can help improve breathing during sleep and lower blood pressure. 

Examples of behavior or lifestyle changes that may help reduce breathing disruptions from OSA include:

  • Sleeping on your side instead of your back
  • Maintaining a healthy body weight
  • Making time for physical activity on a regular basis
  • Eliminating or restricting alcohol consumption at night
  • Avoiding sedative medications
  • Performing specific mouth exercises to help keep tissue in the mouth and throat from obstructing the airway during sleep

Experts also recommend certain lifestyle habits that can help prevent or manage high blood pressure: 

  • Getting blood pressure checked at least once per year
  • Eating a nutritious diet without too much salt
  • Drinking enough water
  • Quitting smoking
  • Finding ways to minimize stress
  • Avoiding significant weight gain
  • Being physically active for at least 150 minutes per week
  • Addressing underlying health issues, such as diabetes

For both OSA and high blood pressure, lifestyle changes may help, but other kinds of treatment may still be necessary. Your doctor can recommend specific lifestyle changes for you, provide tips for implementing those changes, and address whether other treatments for OSA or hypertension are recommended.

Central Sleep Apnea and High Blood Pressure

Central sleep apnea (CSA) is another type of sleep apnea. It is much less common than OSA, and is caused by an inability of the brain and breathing muscles to properly coordinate breathing. Unlike OSA, there is little evidence showing a clear connection between CSA and high blood pressure. 

CSA may have effects on the cardiovascular system, such as increasing the risk of an irregular heartbeat, but the condition is not generally identified as a cause of hypertension. 

That said, CSA can impair sleep, and a lack of sleep is associated with a risk of high blood pressure. CSA may also reduce blood oxygen levels and trigger similar physical stresses as OSA on different systems of the body.

At the same time, having high blood pressure can increase the risk of certain conditions, such as stroke and heart failure, that have the potential to cause CSA.

When to Talk to a Doctor

Consult with your doctor if you have concerns about your blood pressure, sleep apnea, or the overall quality of your sleep. 

High blood pressure itself rarely causes symptoms, so having your blood pressure checked at least once every year may help identify a problem. You may need to have your blood pressure checked more often if you already have hypertension or if you have risk factors for developing it.

If one or more measurements show elevated blood pressure, make sure to ask your doctor about the most appropriate follow-up plan. They can advise you about how frequently to check your blood pressure, any lifestyle changes that may help, and whether you should consider treatment for high blood pressure. 

If you have already been diagnosed with high blood pressure, you may be wondering if you have sleep apnea. You should let your doctor know if you have any of these possible signs of sleep apnea:

  • Paused, slowed, or otherwise irregular breathing during sleep
  • Sounds of gasping or choking while sleeping
  • Frequent snoring that is often very loud
  • Excessive drowsiness during the day
  • Morning headaches
  • Sore throat or dry mouth after waking up
  • Multiple episodes of getting up to urinate

Because you may not be aware of your breathing during sleep, you can ask a bed partner or roommate whether they have noticed any of these issues at night. 

If you have symptoms of sleep apnea, your doctor can help determine whether any type of testing would be beneficial. One or more specific tests must be performed in order to diagnose sleep apnea. 

Written by

Tochukwu Ikpeze, Staff Writer

Tochukwu grew up in New York and has a passion for creative and scientific writing. Tochukwu holds an undergraduate degree in Biology and Psychology, a Master’s degree in Biomedical Science, and a Medical Degree as well. In his free time, Tochukwu enjoys reading, learning, exploring various topics pertaining to the human condition and conveying that information to the public through writing.

Reviewed by

Gerard Meskill, Medical Reviewer

Gerard J. Meskill, MD is board certified in both neurology and sleep medicine, and he is the founder and CEO of Tricoastal Narcolepsy and Sleep Disorders Center. The “Tricoastal” moniker references his background: he completed neurology residency on the East Coast at Long Island Jewish Medical Center – where he served as chief resident, sleep fellowship on the West Coast at Stanford University, and he now practices sleep medicine and neurology on the Gulf Coast in the greater Houston, Texas area.