All about sleep studies
Depending on the rules and regulations on your country, sleep studies can be done in the patient's home or at a sleep clinic.
During a sleep study, your patient's breathing, body movements and responses during the night are monitored to see if he or she has a sleep disorder such as sleep apnoea.
Below is some information you can pass on to your patients about what happens during a sleep study.
In a clinic
In a clinic, hospital or sleep lab, clinical staff will place sensors on your patient's body to monitor their sleep.
Sensors are placed:
- On the chest to monitor heart activity
- Close to the eyelids to measure eye movements that help indicate if the patient is in REM or non-REM sleep
- On the head to measure electrical signals from the brain
- On the legs to assess muscle activity
Patients will also be fitted with:
- A nasal cannula to monitor breathing
- An oximeter on their finger to record oxygen levels
- Bands around their chest and stomach to measure breathing effort
With your patient's permission, staff may also request to film the sleep study to gain more insights into the patient's sleeping behaviour.
During this type of study, your patient will be required to stay overnight at the facility, so they should take everything needed for their usual sleeping routine, including pajamas and toiletries.
There are two types of set-up for a home sleep study:
- A home set-up is similar to that in a clinic, hospital or sleep lab - with the added comfort and convenience of being in the patient's own home. Usually, for a home sleep study, the patient would be fitted with less sensors than for an in-patient study, as mainly information on breathing would be recorded. Prior to the sleep study night, a sleep clinician will have shown your patients how to apply the sensors and monitors, and how to use the recording device during the night.
The night of the sleep test, the patient simply follow a normal evening routine and get ready for sleep, attach everything as shown, and start the recording. In the morning, the patient removes everything as shown and returns the recording device to the clinic, hospital or sleep lab.
- A sleep screening study can be performed using ResMed's ApneaLink™ Air, a compact, lightweight and easy-to-use home sleep testing device. The ApneaLink Air is capable of recording up to five channels of information, including respiratory effort, pulse, oxygen saturation, nasal flow and snoring.
What do sleep studies measure?
Among other things, the sleep study will indicate the severity of your patient's condition, which is classified according to an apnoea/hypopnea index (AHI).
Measured during the sleep study, AHI refers to the number of apnoeas and hypopneas your patient has per hour (< 5 to 30+).1
In addition to the patient's AHI, the diagnosis will take into account the patient's oxygen desaturation and in case of OSA, excessive daytime sleepiness.
Once you receive your patient's sleep study results, you can then talk to him or her about the condition (if it's present), its severity, its possible health effects and treatment options.