Accuracy Assessment of Type III Portable Monitor of Sleep Apnea for In-hospital Patients With Cardiovascular Disease / 中国循环杂志

ABSTRACT

Objective: To assess the accuracy and application value of type III portable monitor (III PM) of sleep apnea (SA) for in-hospital patients with cardiovascular disease (CVD). Methods: A total of 101 CVD patients received sleep apnea monitoring by both type II polysomnography ( II PSG) and III PM were enrolled to compare the apnea-hypopnea index (AHI) measured by 2 instruments. AHI was assigned into 4 grades Normal (AHI0.05. Kendall correlation coefficient for 4 AHI grades was 0.701, P<0.01 which assumed strong correlation; Kappa value of consistency was 0.493, P<0.01 which assumed medium strong correlation. Using AHI≥15 as cut-off point, Kappa coefficient for the consistency between II PSG and III PM was 0.679, P<0.05, which meant high consistency. Taking II PSG as standard and AHI≥15 as cut-off point, the AUC of III PM measured AHI was 0.918 with the specificity at 80.4% and sensitivity at 87.3%. The best diagnosing cut-off value of III PM was AHI=15.70, at this point, the maximum Youden's index was obtained as 0.695. Conclusion: Using AHI≥15 as standard, III PM and II PSG had the favorable consistency and accuracy for monitoring the severity of SA for in-hospital patients with cardiovascular disease. AHI=15.7 was the best cut-off point of III PM in diagnosing moderate and severe SA in relevant patients.