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Measurement variability in sleep disorders medicine: the Victorian experience
R L Manser1, P Rochford, M T Naughton
1Clinical Epidemiology and Health Service Evaluation Unit, Royal Melbourne Hospital, Victoria, Australia. ManserRL@mh.org.au
Internal Medicine Journal
|August 7, 2002
Summary
Sleep laboratories in Victoria show significant variability in defining and measuring sleep-disordered breathing (SDB). This inconsistency, especially in hypopnoea definitions, impacts the comparability of polysomnography results.
Area of Science:
- Sleep Medicine
- Respiratory Physiology
Background:
- North American surveys reveal diverse definitions for respiratory events in sleep studies.
- Sleep-disordered breathing (SDB) measurement lacks standardized reporting criteria.
Purpose of the Study:
- To evaluate variations in measuring SDB, specifically the Apnoea-Hypopnoea Index (AHI), across Victorian sleep laboratories.
- Identify sources of measurement variability in sleep studies.
Main Methods:
- A survey questionnaire was developed through literature review and expert interviews.
- The survey targeted all Victorian laboratories listed by the Australasian Sleep Association.
- Data collected covered equipment used and reporting definitions for polysomnography.
Main Results:
- 17 of 18 laboratories participated.
- Variations were found in sensor types and criteria for scoring arousals, apnoeas, and hypopnoeas.
- The greatest variability was observed in hypopnoea definitions.
Conclusions:
- Significant variation exists in SDB measurement and definition methods among Victorian sleep labs.
- Further evaluation is needed to understand how these variations affect result comparability.
- Findings can inform the development of local guidelines for polysomnography performance and reporting.
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