Types of Sleep Apnea : Obstructive – Central And Complex

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Obstructive, central and complex – are the three types of sleep apnea, of which obstructive sleep apnea is most prevalent. More than 50% of patients diagnosed with apnea suffer from this type.

  • Obstructive sleep apnea, the more common form that occurs when throat muscles relax
  • Central sleep apnea, which occurs when your brain doesn’t send proper signals to the muscles that control breathing
  • Complex sleep apnea syndrome, also known as treatment-emergent central sleep apnea, which occurs when someone has both obstructive sleep apnea and central sleep apnea

Obstructive Sleep Apnea

This condition is marked by multiple pauses in breathing during sleep (called apnea episodes) where a single pause can last from a few seconds to a few minutes. The number of pauses that a patient is likely to experience depends on how serious the condition is. It ranges between 5 and 30 in an hour.

Affecting close to 4% of American adults, it is caused by complete collapse or blockage of the upper respiratory tract. Narrowing of the airways can be attributed to various factors like obstructive tissues blocking the airway; anatomical abnormalities of the jaw; enlarged tongue or tonsils and many more.  Breathing can also be impaired when there is blockage in the nasal passage.

Types of Sleep Apnea

What exactly happens to the apnea patient during sleep?

During sleep, all the muscles of the body are in a relaxed state. This includes the muscles which help us breathe. This means that these muscles help in keeping the airway open for allowing air to flow in and out. When you are sleeping, the upper throat muscles should remain open for air to flow.

But when these muscles are over-relaxed, they become floppy and impede airflow which cause breathing distress. The breathing pauses are thus a result of the muscles of the back of the throat failing to keep the air passage open.

The primary job of these muscles is to support the soft palate, the uvula (the soft triangular piece of tissue hanging from the soft palate), the tonsils and the tongue. Such an important support system may be jeopardized when they are relaxed. The flow of air becomes restricted or may even stop. Over and above stoppage of breathing this also causes a sharp drop in oxygen levels in the brain.

This makes the brain react immediately. Sleep is interrupted and the sleeper tries to breathe again which starts with gasps and chokes.

What Causes Obstruction to Normal Airflow? 

Several factors can be responsible for causing impedance to normal airflow to and from the lungs:

  • Obese individuals have excess fat accumulation around their neck which narrows the air pipe. This excess fat thickens the walls of the pipe and obstructs airflow.
  • Deviated septum, an anatomical defect from birth or caused by a sports injury to the nose area cause hindrance to breathing. When the central cartilage inside the nostril (the septum) is inclined more on one side, normal airflow is restricted.
  • Enlarged nasal turbinates
  • Thickened soft palate and uvula
  • The muscles of the tongue and tonsils are large in comparison to the opening of the windpipe.
  • The anatomical structure of the head and neck may be defective causing narrower airway in the mouth and throat.
  • As you grow older, the muscles of the throat lose their tautness. This makes the muscles prone to collapse and even block the airway during sleep.

What are the consequences of Obstructive Sleep Apnea?

Obstructive sleep apnea not only causes short term distress but also has serious long-term consequences. Many of its long-term effects are potentially dangerous and life-threatening.

But the irony is that most of the time, early diagnosis of the disorder and subsequent initiation of therapy is delayed, since most of the symptoms show up only when the patient is asleep.

When the condition is undiagnosed and therefore untreated, it can result in:

  • Elevation of blood pressure, increased risk of heart attack, strokes, obesity and diabetes
  • Increased risk of heart failure
  • Irregularity of heart beats
  • Since excessive daytime sleepiness is a common after-effect of sleep apnea, patients have increased risk of accidents.

Do children also get affected by this disorder?

This disorder is known to affect kids who are between 2 and 8 years old.    As far as pediatric snoring statistics are concerned, figures show that between 3 and 12% children snore.  Of these children, an estimated 1 to 10% can get affected by sleep apnea.

The following factors are considered to increase the risk amongst children:

  • Adenotonsillar hypertrophy, neuromuscular disease, and craniofacial abnormalities.
  • Facial deformities like smaller jaw, smaller opening at the back of the throat
  • Enlarged tonsils or adenoids
  • Deviated septum
children obstructive apnea

When children remain untreated, it results in several illnesses as well as behavioral problems. These include problems in areas of learning and overall growth and development, heart, rise in blood pressure, etc. The child may also undergo personality changes and develop excessive daytime tiredness, enuresis, bed wetting, etc.

How can one know about its onset?

Obstructive sleep apnea is one of the most common undiagnosed sleep disorders. This is because the symptoms remain unnoticed as they only appear during sleep. Statistics show that there are close to 18 million American adults who are suffering from this condition but they are yet to be diagnosed.

It is usually the person who shares the same bed or room with the patient who notices the distress and helps the patient to seek medical advice. The first symptoms that cause alarm are:

  • Loud and chronic snoring
  • Snoring with intermittent pauses during which it would appear that the sleeper has stopped breathing.
  • Gasping and choking during sleep

However there are some symptoms which alert the patient. These include: daytime sleepiness, focusing problems, depression, irritability, lack of interest in sex, forgetfulness, irrational weight gain, etc.  

What is the rationale of gaining weight when affected by sleep apnea?

Though there are several factors which can be responsible for triggering sleep apnea symptoms, excessive body weight is considered to be a prime cause. Be that as it may, a person may also gain weight while suffering from this condition. Thus a question could be which came first – obesity or sleep apnea. Frankly, it is still unclear, which happens first. All that is known is that on one hand, obesity promotes the onset; on the other, gaining excess and often unexplained weight is a likely outcome.

Are the symptoms same for men and women?

sleep apnea manand women

Some symptoms of this disorder are same for both men and women. For example, both genders show signs like interrupted sleep, choking and gasping during sleep, persistent snoring problems, daytime lethargy, focusing problems, etc.

But there are some signs which only men show and they are loss of libido and erectile dysfunction.

The link between sleep apnea and erectile dysfunction (ED) has been documented in a published report in The Journal of Sexual Medicine in 2009, where German researchers found that as much as 69% of male apnea patients suffered from ED. The rationale behind this association could be that during sleep, patients experience chronic oxygen deprivation. According to the research scientists, even a small deficiency of oxygen can have significant impact on sexual activity and erectile function.

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As far as women and sleep apnea symptoms are concerned, one study showed that close to half of women experiencing signs like chronic snoring, choking, recurrent breathlessness during sleep, etc never reports them to the doctor. On the contrary, they report symptoms like insomnia, depression, fatigue, morning headaches, mood disturbances, etc. which are mostly non-specific.

This usually results in misdiagnosis or no diagnosis of the disorder for women. The number of women referred to a sleep clinic for a sleep study is therefore far less than men. Be that as it may, the symptoms are far more subtle in women than they are in men. This makes it tougher for the doctor to diagnose a woman with sleep apnea.

The following factors are responsible for increasing the risk for women to develop sleep apnea:

  • Excessive fat accumulation in the lower part of the air passage.
  • Neck size: 16 inches or more.
  • Excessive consumption of alcohol
  • High blood pressure
  • Women in the menopausal and post-menopausal age group run high risk. Deposition of excess fat in the abdominal region can increase the risk by 3.5 times.
  • Polycystic ovarian syndrome during which there is excess flow of male hormones. The risk during this condition can increase by 4 times.
  •  Age over 50 years.

Central Sleep Apnea

This type of apnea happens when the brain does not send any breathing signals to the breathing muscles. The outcome is that there is no attempt to breath for short periods. This is less common than obstructive sleep apnea and is more associated with ailment of the central nervous system. On the other hand, obstructive sleep apnea happens when there is obstruction in the upper airway. Snoring is not evident in people affected by this condition.

This condition is commonly associated with heart failure and less commonly with stroke. While central sleep apnea can affect anyone, it is more common with people who have certain types of medical conditions or use certain kinds of medicines. It can appear with or without obstructive sleep apnea.

central sleep apnea

What are the medical conditions that cause or lead to this ailment?

  • Life-threatening ailments linked to brainstem
  • Arthritis and degenerative changes in the cervical spine
  • Bulbar poliomyelitis
  • Post-surgical complications of cervical spine
  • Encephalitis or stroke impacting the brainstem
  • Parkinson’s disease, other neurodegenerative conditions
  • Obesity
  • Radiation of the cervical spine
  • Primary hypoventilation syndrome
  • Narcotic-containing painkillers; opioids like morphine, oxycodone or codeine
  • High-altitude (more than 15,000 feet)

How to know about the onset of this condition?

The signs change according to the precise cause of onset as well as the specific part of nervous system that is affected.

  • Tiredness
  • Daytime fatigue
  • Morning headaches
  • Restlessness sleep
  • Problems with swallowing
  • Voice change
  • Numbness affecting the whole body.

Complex sleep apnea

The rarest of the three types of apnea; it is a combination of obstructive sleep apnea and central sleep apnea.


Almost anyone can be affected by sleep apnea especially, obstructive sleep apnea. However, there are certain risk factors that can pre-empt early onset of the ailment. You need to be aware of them, as well as keep a close vigil on the symptoms. This way, it is possible to get the condition diagnosed early – so that right type of treatment can be initiated.

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