Influence of nasal or oro-nasal mask on the difference between automatic versus manual detection of residual events in CPAP treated OSAS patients

Abstract

AIM: was to study the influence of nasal or oro-nasal interface on the difference between automatic (AUTO) to manual (MAN) detection of residual respiratory events in CPAP treated OSAS patients POPULATION and PROTOCOL: Fifty-three subjects ( M/F 43/10, age 21-86 years) with OSAS (AHI 47.5±21.7), after training and identification of correcting pressure (by autoCPAP for 3/4 nights), performed during CPAP treatment a cardiorespiratory monitoring with MAN detection of residual respiratory events (AASM 2007). MAN residual events were compared with AUTO detected by CPAPdevice during tratment (System One REMStar Series; Philips Respironics, Netherlands). RESULTS: Treatment was highly effective, independently from interface, reducing AHI from 47.5±21.7 to 3.5±3.8, increasing mean nocturnal SpO2 from 90.9±3.4% to 95.1±1.5%, and reducing time with SpO2 AHI AUTO was higher (3.6±3.8 vs 1.0±1.1, NS) than MAN, with good correlation (r=0.645, p Considering as optimal treatment a cut-off of 5.0 residual events per hour (MAN), a value of 10 of AHI AUTO showed 96% sensitivity and 100% specificity in identifying optimally treated patients. CONCLUSIONS: Analysis of residual events automatically performed by CPAP commercial device, during OSAS treatment, provides data with reasonably agreement with manual ones. Nasal masks allow more careful automatic data detection and minimize air leaks.