What causes sleep apnoea?
Intermittent (comes and goes) blockage in some part of the upper airways, often due to the throat muscles and tongue relaxing during sleep, can cause sleep apnoea. When the muscles of the soft palate at the base of the tongue and the uvula (the small fleshy tissue hanging from the centre of the back of the throat) relax and sag, the airway becomes blocked. The blockage makes breathing laboured and noisy and even stops it altogether.
What are the effects of sleep apnoea?
During the pauses in breathing, the oxygen level in your blood drops. Your brain reacts to the drop in oxygen by waking you enough to resume breathing (and snoring), but not necessarily enough to fully awaken you. The cycle of snoring, not breathing, waking, and resuming breathing means that you do not get good quality sleep. Because of this, you may often feel very sleepy during the day, find it hard to concentrate, and your daytime performance may suffer.
The effects of sleep apnoea range from annoying to life threatening. They include depression, high blood pressure, irritability, sexual dysfunction, learning and memory problems, and falling asleep while at work, on the phone, or driving. People with severe sleep apnoea are two to three times more likely to have automobile crashes. Risk for heart attacks, high blood pressure, heart failure, and stroke also increase with sleep apnoea.
How do I know if I have sleep apnoea?
People with sleep apnoea are often not aware that they have it. You should suspect sleep apnea if you often feel sleepy during the day, and you have been told that you snore loudly and frequently, or seem to have trouble breathing during the night.
Your bed partner may notice your heavy snoring and struggles to breathe during sleep. Co-workers or friends may notice that you tend to fall asleep during the day at inappropriate times. If you think that you have sleep apnea, it is important that you see a doctor for evaluation of the sleep problem.
How is sleep apnea diagnosed?
In addition to your primary care provider, a sleep medicine specialist needs to be involved in the diagnosis, as well as treatment. Diagnosis of sleep apnoea is not simple because there can be many different reasons for disturbed sleep. If sleep apnoea is suspected, the sleep medicine specialist will need to perform a sleep study. This usually means going to a sleep center, where tests are done while you sleep. This test is called polysomnography, which records a variety of body functions during sleep. These recordings can sometimes be done at home.
How is sleep apnoea treated?
The specific therapy for sleep apnoea is based on your medical history, physical exam, and the results of polysomnography or other tests.
Possible treatments for sleep apnoea include:
- Behavioural changes such as weight loss, learning to sleep on one’s side instead of the back, and avoiding alcohol, sleeping pills, and smoking. In milder cases, behavioural changes may be enough to stop the sleep apnea.
- Nasal Continuous Positive Airway Pressure (CPAP) therapy, is generally required for successful treatment. In CPAP therapy, a mask is worn over the nose while sleeping, and a machine supplies pressurized room air to the mask through a flexible tube. The pressurized air keeps the airway open. There are various types of CPAP machines.
- An oral or dental device that holds the tongue or jaw forward.
- Surgery. Some of the more common procedures include removal of adenoids and tonsils, especially in children; removal of nasal polyps or other growths; and correction of structural deformities.
- Medications are generally not effective in the treatment of sleep apnea. However, if nasal congestion is contributing to breathing problems, decongestants may help.
Can sleep apnoea be prevented?
Avoiding weight gain as you age is probably one of the best ways to prevent sleep apnea. Avoiding the use of alcohol and sedating medicines may also help.