Please use this identifier to cite or link to this item: https://hdl.handle.net/2440/94560
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Type: Journal article
Title: A comprehensive evaluation of a two-channel portable monitor to "rule in" obstructive sleep apnea
Author: Ward, K.
McArdle, N.
James, A.
Bremner, A.
Simpson, L.
Cooper, M.
Palmer, L.
Fedson, A.
Mukherjee, S.
Hillman, D.
Citation: The Journal of Clinical Sleep Medicine, 2015; 11(4):433-444
Publisher: American Academy of Sleep Medicine
Issue Date: 2015
ISSN: 1550-9389
1550-9397
Statement of
Responsibility: 
Kim L. Ward, Nigel McArdle, Alan James, Alexandra P. Bremner, Laila Simpson, Matthew N. Cooper, Lyle J. Palmer, Annette C. Fedson, Sutapa Mukherjee, David R. Hillman
Abstract: STUDY OBJECTIVES We hypothesized that a dual-channel portable monitor (PM) device could accurately identify patients who have a high pretest probability of obstructive sleep apnea (OSA), and we evaluated factors that may contribute to variability between PM and polysomnography (PSG) results. METHODS Consecutive clinic patients (N = 104) with possible OSA completed a home PM study, a PM study simultaneous with laboratory PSG, and a second home PM study. Uniform data analysis methods were applied to both PM and PSG data. Primary outcomes of interest were the positive likelihood ratio (LR+) and sensitivity of the PM device to “rule-in” OSA, defined as an apnea-hypopnea index (AHI) ≥ 5 events/h on PSG. Effects of different test environment and study nights, and order of study and analysis methods (manual compared to automated) on PM diagnostic accuracy were assessed. RESULTS The PM has adequate LR+ (4.8), sensitivity (80%), and specificity (83%) for detecting OSA in the unattended home setting when benchmarked against laboratory PSG, with better LR+ (> 5) and specificity (100%) and unchanged sensitivity (80%) in the simultaneous laboratory comparison. There were no significant night-night (all p > 0.10) or study order effects (home or laboratory first, p = 0.08) on AHI measures. Manual PM data review improved case finding accuracy, although this was not statistically significant (all p > 0.07). Misclassification was more frequent where OSA was mild. CONCLUSIONS Overall performance of the PM device is consistent with current recommended criteria for an “acceptable” device to confidently “rule-in” OSA (AHI ≥ 5 events/h) in a high pretest probability clinic population. Our data support the utility of simple two-channel diagnostic devices to confirm the diagnosis of OSA in the home environment.
Keywords: obstructive sleep apnea
portable monitor
positive likelihood ratio
rule-in
sensitivity
type 4
validation
Rights: Copyright status unknown
DOI: 10.5664/jcsm.4600
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