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Sleep Testing


Diagnostic/Split Night Polysomnography

These tests involves being admitted to the sleep laboratory (an approved facility) at the NZ Respiratory and Sleep Institute.  You will arrive in the early evening and remain until 8:00 am the following day.  During the recording period a number of physiological measurements are continuously monitored.  These include:
 
  • Six channel electroencephalogram (EEG)
  • Two channel electrooculogram (EOG)
  • Genioglossus electromyogram (EMG)
  • Electrocardiogram (ECG)
  • Nasal and oral Airflow, chest and abdominal respiratory effort, body position, oxygen saturation by oximetry, snore detection and leg movements
  • Sleep is also monitored and recorded via an infrared video monitor.

The study is supervised throughout the night by a qualified sleep physiologist.  In the morning, the study is analysed in 30-second blocks (known as epochs).  The study is then reviewed by a specialist with training in sleep disorders, and a full report written for the referring specialist and patient’s general practitioner.  A copy is also sent to the patient.
  
Complex Respiratory Study
 
This is a limited sleep study performed in the patient’s home. Recording includes electrocardiogram (ECG), nasal and oral airflow, chest and abdominal respiratory effort, body position, oxygen saturation by oximetry and snore detection. This is used as a screening test for sleep apnea but may also be used to assess adequacy of treatment  (e.g. dental splints, a nasal continuous positive airway pressure (CPAP) generator, or following upper airway surgery performed by an ear, nose and throat surgeon). This test requires the patient to attend at the Institute for setup of the recording device, which they then return the following morning. 
 
 
Screening Respiratory Study

This is similar to a Complex Respiratory Study, however it records less information. Recording includes nasal and oral airflow, body position, oxygen saturation by oximetry and snore detection. This test requires the patient to attend at the Institute for setup of the recording device, which they then return the following morning. 
 
 
Multiple Sleep Latency Test (MSLT)
 
This test is always performed following an overnight polysomnography study as outlined in above. This involves staying in the sleep laboratory for a further eight to ten hours throughout the day.  Recording includes six channel electroencephalogram (EEG), two channel electrooculogram (EOG), genioglossus electromyogram (EMG), electrocardiogram (ECG) and snore detection.

There are five nap opportunities attempted at two-hourly intervals during the day. This test is performed as part of the clinical assessment for patients with suspected narcolepsy.
 
 
Maintenance of Wakefulness Test (MWT)
 

This test is always performed following an overnight polysomnography study as outlined above. This involves staying in the sleep laboratory for a further eight hours. Recording includes six channel electroencephalogram (EEG), two channel electrooculogram (EOG), genioglossus electromyogram (EMG), electrocardiogram (ECG) and snore detection. This test involves staying awake in a dimly lit room during periods of testing.

There are four sessions performed at two-hourly intervals during the day.  This test is performed as part of the clinical assessment of an individual’s ability to remain awake when his or her inability to remain awake constitutes a public or personal safety issue.
 
CPAP Pressure Setting Study
 
This test involves using an auto-adjusting positive airway pressure (APAP) machine to determine the adequate treatment pressure for a patient . The APAP machine responds to snoring as well as obstructive respiratory events. The severity and type of sleep apnea determines whether the patient may be established onto pressure therapy using an APAP.


 

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PHONE                  09 638 5255
FREEPHONE         0800 895 120
FAX                        09 638 6022

referrals@nzrsi.health.nz

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Level 3, Building B
93-95 Ascot Avenue
Greenlane East
AUCKLAND 1051

Northcare
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Rosedale
Auckland
POSTAL ADDRESS
PO Box 109 409
Newmarket
Auckalnd 1149