Respiratory event detection by a positive airway pressure device
Richard B Berry1, Clete A Kushida, Meir H Kryger
1Department of Medicine, University of Florida, Gainesville, FL 32610, USA. sleep_doc@msn.com
Study Objectives:
Compare automatic event detection (AED) of respiratory events using a positive airway pressure (PAP) device with manual scoring of polysomnography (PSG) during PAP treatment of obstructive sleep apnea (OSA).
Design:
Prospective PSGs of patients using a PAP device.
Setting:
Six academic and private sleep disorders centers.
Patients:
A total of 148 PSGs from 115 participants with OSA (apnea-hypopnea index [AHI] ≥ 15 events/hr) were analyzed.
Interventions:
A signal generated by the PAP device identifying the AED of respiratory events based on airflow was recorded during PSG.
Measurements And Results:
The PSGs were manually scored without visualization of the AED signal and scoring of a hypopnea required a ≥ 4% oxygen desaturation. The apnea index (AI), hypopnea index (HI), and AHI by manual score and PAP AED were compared. A customized computer program compared individual events by manual scoring and AED to determine the true positive, false positive, false negative, or true negative events and found a sensitivity of 0.58 and a specificity of 0.98. The AHI, AI, and HI by the two methods were highly correlated. Bland-Altman analysis showed better agreement for AI than HI. Using a manually scored AHI of ≥ 10 events/hr to denote inadequate treatment, an AED AHI ≥ 10 events/hr had a sensitivity of 0.58 and a specificity of 0.94.
Conclusions:
An AHI < 10 events/hr by PAP AED is usually associated with good treatment efficacy. Differences between manually scored and AED events were primarily due to different criteria for hypopnea detection.
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