THE OVERNIGHT STUDY
THE POLYSOMNOGRAM (DIAGNOSTIC) STUDY:
An overnight sleep study is done to assess your sleep and to diagnose any problems you may be having during sleep.
During the sleep study (also known as a Polysomnogram or PSG) you will be wired up to a small box which reads your brain waves while you sleep (EEG). You will have leads on your chest which read your heart rhythms (EKC), wires to your legs and chin which monitor muscle activity during different stages of sleep, a nasal cannula which assesses your breathing, as well as a band around your chest which measures the effort you make while breathing. In addition a probe is attached to your finger which reads the level of oxygen in your blood. All these measures give the technician who monitors your sleep study, and the doctor who will assess the data provided, the information they need to make an accurate diagnosis of any disorders or problems during your sleep.
All patients are observed during the sleep study by their technician and some patients are video-taped if there has been a history of sleep walking, sleep talking or other unusual behaviours reported during sleep.
Once the recording is complete, usually after 6 hours, you will be awoken and you will leave the laboratory between 6.15 and 6.45 am. If you require follow up you will hear from our office within four weeks. Your family doctor will get a written report from us within four weeks with recommendations for your treatment.
THE CPAP STUDY (TREATMENT) STUDY:
A CPAP titration study is done after apnea has been diagnosed. The procedure is much the same as with the first overnight study. The technician will help you to become acclimatized to a CPAP mask early in the evening by encouraging you to sit with the mask and machine on before you go to sleep.
Once you fall asleep, your technician will increase the air pressure of the CPAP machine until all snoring and apneas are controlled. We strive to get the correct pressure for you so that CPAP feels comfortable and resolves the breathing problems during sleep.
After the CPAP study, you will be phoned by the CPAP company of your choice to pick up a machine for use at home. Many patients elect to trial the machine at home until they are followed up by the doctor. The doctor will help to assess the success of CPAP. Some people, especially those with severe apnea, feel so much better on CPAP that they elect to purchase the machine of their choice immediately.
You will be seen in follow up by our doctors after your CPAP study regardless of whether you purchase or trial the machine. We strongly encourage you to use the machine prior to seeing the doctor. The doctor will then be able to make an accurate assessment of the success of the treatment or the need for alternate treatment.