Health screening in Singapore- What is Sleep apnoea ?

Some people may suffer from a condition called sleep apnoea.

Sleep apnoea occurs when the walls of the throat come together during sleep, blocking off the upper airway. Breathing stops for a period of time (generally between ten seconds and up to one minute) until the brain registers the lack of breathing or a drop in oxygen levels and sends a small wake-up call. The sleeper rouses slightly, opens the upper airway, typically snorts and gasps, then drifts back to sleep almost immediately.

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In most cases, the person suffering from sleep apnoea doesn’t even realise they are waking up. This pattern can repeat itself hundreds of times every night, causing fragmented sleep. This leaves the person feeling unrefreshed in the morning, with excessive daytime sleepiness, poor daytime concentration and work performance, and fatigue.

Symptoms of sleep apnoea

People with significant sleep apnoea have an increased risk of motor vehicle accidents and high blood pressure, and may have an increased risk of heart attack and stroke. In the over-30 age group, the disorder is about three times more common in men than women. Some of the associated symptoms include:

  • daytime sleepiness, fatigue and tiredness
  • poor concentration
  • irritability and mood changes
  • impotence and reduced sex drive
  • need to get up to toilet frequently at night.

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Causes of sleep apnoea

Obesity is one of the most common causes of sleep apnoea. Other contributing factors include:

  • alcohol, especially in the evening – this relaxes the throat muscles and hampers the brain’s reaction to sleep disordered breathing
  • certain illnesses, such as reduced thyroid production or the presence of a very large goitre
  • large tonsils, especially in children

Treatment for sleep apnoea

Treatment for sleep apnoea relies on changes to lifestyle, including losing weight and cutting down on alcohol. Any contributing medical condition, such as low production of thyroid hormone, also needs to be corrected. Any surgical conditions such as large tonsils should be corrected.

The most effective treatment available is a mask worn at night that prevents the throat from collapsing by transmitting increased air pressure to the collapsible segment of the throat. This is called ‘nasal continuous positive airway pressure’ (CPAP). The key to this treatment is finding a mask and machine that match the needs of a given individual with sleep apnoea.

Another treatment is the use of a mouthguard (or oral appliance or mandibular advancement splint). Mouthguards work by holding the jaw forward during sleep. When properly made, they can be effective for mild to moderate sleep apnoea.

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Although not always effective, surgery to the palate and base of tongue may be useful when other therapies fail. These types of surgeries are best undertaken by otolaryngologists (ear, nose and throat surgeons) who take a special interest and have had training in sleep-related surgery.

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