What Is Hypoventilation Syndrome Of Sleep?

What Is Hypoventilation Syndrome Of Sleep?

Hypoventilation syndrome of sleep (HSOS) is a condition where there is a decrease in the amount of air that passes through the lungs during sleep. This may happen for a number of reasons. For example, it could be due to a problem with the nerves or muscles in the nose or throat that controls the air passages. This can cause the airway to narrow, which reduces the flow of air into the lungs. In this blog, we’ll understand everything about hypoventilation sleep syndrome. 

1. What is Hypoventilation Syndrome Of Sleep?

The cause of hypoventilation is a deficiency in the level of carbon dioxide in the blood. Carbon dioxide is the gas that our bodies used to help regulate the amount of oxygen we breathe in and out. The level of carbon dioxide in the blood is regulated by a chemical called carbonic acid. Carbonic acid is created by the reaction of carbon dioxide with the mineral bicarbonate.

Hypoventilation is the inability to exhale air during sleep. This condition can happen when the muscles of the chest and diaphragm are weak and fail to push air out of the lungs. It is often associated with a condition called sleep apnea. Sleep apnea is caused by repeated pauses in breathing during sleep. The most common symptom of sleep-related hypoventilation is snoring. Snoring is a vibration of the soft tissues of the throat that occur during sleep. People who snore may not be aware that they are experiencing sleep-related hypoventilation. They may not have any symptoms of sleep apnea.

2. What are the Causes of Hypoventilation?

The hypoventilation syndrome of sleep can occur as a part of various conditions, such as:

  • Damaged lung
  • Moving restrictions in lungs – chest wall deformities
  • Breathing control of the brain is impaired – Congenital Central Hypoventilation Syndrome (CCHS)
  • Narrowed airways – Obstructive Sleep Apnoea (OSA)
  • Main breathing muscles, and in particular the diaphragm, are affected (for example neurological, neuromuscular, or obesity hypoventilation syndromes)

3. Types of Hypoventilation

The six subtypes of sleep-related hypoventilation each have different mechanisms that cause hypoventilation. The most common cause of hypoventilation is obesity hypoventilation syndrome (OHS). This is due to chronic intermittent hypoxia and hypercapnia. The other types are rarer.

  • Obesity-related hypoventilation syndrome (OHS)
  • Congenital central alveolar hypoventilation syndrome (CCHS)
  • Late-onset central hypoventilation with hypothalamic dysfunction
  • Idiopathic central alveolar hypoventilation
  • Sleep-related hypoventilation due to a medication or substance
  • Sleep-related hypoventilation due to a medical disorder

4. Symptoms of Hypoventilation?

People often think that sleep-related hypoventilation is caused by hypercapnia or the buildup of carbon dioxide in the blood.

These diseases can cause serious heart problems, such as lung embolism. This patient has fluid overload and may have hypervolemia, polycythemia, or both. His lab results may show elevated levels of Bicarb and polycythemia.

5. Diagnosis of Hypoventilation

Although many factors cause sleep-related hypoventilation, a comprehensive assessment is needed to determine which factor is causing the problem. There are many ways to look for sleep issues, from taking a detailed history of sleep to looking for the presence of symptoms that suggest an underlying sleep disorder.

Medical exams can help you find other medical conditions that cause sleep-related hypoventilation and rule out other contributing factors. To diagnose sleep-related hypoventilation, doctors must observe the patient’s respirations and carbon dioxide levels during sleep.

During sleep, the main test used to evaluate breathing is polysomnography, which is also called a sleep study. It’s important to be in the right environment when doing an exam or procedure such as this so it should be performed in a sleep lab where you can be closely monitored by trained technicians.

6. How to Treat Hypoventilation Syndrome?

This is a decision that depends on the situation and will be based on the underlying cause of hypoventilation syndrome of sleep.

SRH can be treated with a variety of medications, including steroids and bronchodilators. The treatment of choice is usually the administration of an inhaled beta2-agonist, such as salbutamol or albuterol. The most common side effects of these drugs are mild drowsiness, and some patients experience a short-lived reduction in the severity of their symptoms.

In addition, scoliosis is associated with a number of other medical conditions that are common in the child with scoliosis. These include obstructive sleep apnea, gastroesophageal reflux, and neuromuscular disorders such as Duchenne muscular dystrophy, spinal muscular atrophy, and cerebral palsy.


Hypoventilation Syndrome of Sleep (HVS) is caused by a failure of the respiratory center of the brainstem to control ventilation. It is a disorder that occurs when the brainstem is unable to control the amount of ventilation that is needed to maintain normal blood oxygen levels.

People who have hypoventilation syndrome of sleep may experience a number of symptoms. These include problems with breathing during sleep and waking up feeling tired and not rested.

The most effective treatment for hypoventilation syndrome of sleep is to treat the underlying cause.

The most common symptoms of hypoventilation syndrome of sleep are problems with breathing during sleep and waking up feeling tired and not rested.

The most effective treatments for hypoventilation syndrome of sleep are to treat the underlying cause.


OHS is a condition that affects the ability to breathe during sleep. It is caused by an obstruction in the airway and often occurs when the patient has a large neck mass. If you are experiencing symptoms of OHS, you should speak with your doctor. Your doctor may perform a sleep study to help identify the cause of your OHS and recommend a treatment plan. We hope now you understand Hypoventilation Syndrome of Sleep in a better way.

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