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Interpreting Results

The results from your patient's sleep study will come by a three page report.

 

Page 1 of the sleep study report contains five sections, detailing key parameters measured, the findings and recommendations. These five sections include:

 

Sleep Quality

This is a summation of the sleep achieved on the night of the sleep study.

 

This includes objective quality based on sleep efficiency, sleep latency, latency to stage R sleep and quantities of each sleep stage and sleep position.

 

There is also the patient’s subjective view of their sleep quality and comparison to a typical night’s sleep.

Detailed statistics on all parameters measured are found on page two of the report.

 

Breathing

This is a summation of respiratory events on the night of the sleep study.

The apnea-hypopnea index (AHI) is detailed, which is a figure that indicates the number of times there was an obstruction to the airway (per hour) and therefore indicates the severity of sleep apnea. 

There is an account of the respiratory disturbance in relation to sleep stages and sleep positions. This is typically whether the respiratory disturbance was more severe when supine or during stage R sleep, which assists in the management pathway for the patient.

There is also an account of snoring, episodes of significant oxygen desaturation and the severity of desaturation.

 

Movement

This outlines the presence of abnormal limb movements during sleep – an indication of periodic limb movement disorder.

 

Additional

Summarises the findings from ECG tracings and details any other significant findings from the sleep study. 

 

Recommendations

This section contains the management strategy for the patient’s sleep disorder.

 

Depending on the presence or severity of a sleep disorder, this may include a trial of treatment, appointment with a sleep physician, or follow-up with the referring doctor. 

Page 2 of the sleep study report contains details statistics on all measurements from the sleep study. This includes:

Report time ; Sleep period; Total time awake during sleep period; Total sleep time; Sleep efficiency; Sleep latency: Stage R sleep latency.

Amount of sleep achieved through stages N1, N2, N3 and stage R sleep; Amount of sleep achieved in each sleeping position.

AHI covering: Central apnea; Obstructive apnea; Mixed apnea; Hypopnea.

Duration of the longest apnea; Duration of the Longest Hypopnea.

Total 4% Dip rate during sleep; Total sleep time oxygen saturation ≤ 89%; SpO2 nadir; PLM statistics.

Arousal statistics associated with: Respiratory events; Periodic limb movements; Spontaneous; RERA. 

Page 3 of the report is the sleep study summary graph. This provides a snapshot of:

 

Time scale of the night; Hypnogram (representing the stages of sleep); Arousals; Body Position; Respiratory Events; Sound; Heart Rate and Period Limb Movements.

If you have any questions regarding the results from your patient's sleep study, please contact us so that we can put you through to one of our sleep physicians for discussion.