Validation of Watch-PAT-200 against polysomnography during pregnancy

• Published in: Journal of clinical sleep medicine 2012-06, Vol.8 (3), p.287-294
• Main Authors: O'Brien, Louise M, Bullough, Alexandra S, Shelgikar, Anita V, Chames, Mark C, Armitage, Roseanne, Chervin, Ronald D
• Format: Article
• Language: English
• Subjects: Adult; Female; Humans; New Research; Polysomnography - instrumentation; Pregnancy - physiology; Pregnancy Complications - diagnosis; Pregnancy Complications - physiopathology; Prospective Studies; Sensitivity and Specificity; Single-Blind Method; Sleep - physiology; Sleep Apnea, Obstructive - complications; Sleep Apnea, Obstructive - diagnosis; Sleep Apnea, Obstructive - physiopathology
• ISSN: 1550-9389; 1550-9397
• DOI: 10.5664/jcsm.1916

To determine the relationships between key variables obtained from ambulatory polysomnography (PSG) and the wrist-worn Watch-PAT 200 device in pregnant women. In this prospective cohort study, women in their third trimester of pregnancy underwent full overnight home PSG using the 22-channel MediPalm system and the Watch-PAT 200 device. PSGs were scored by a blinded, experienced technologist using AASM 2007 criteria; the Watch-PAT was scored automatically by the manufacturer's proprietary software. A total of 31 pregnant women were studied. Mean age was 30.2 ± 7.1 years; mean gestational age was 33.4 ± 3.0 weeks; mean BMI was 31.9 ± 8.1 kg/m(2); 39% of women were nulliparous. Key variables generated by PSG and Watch-PAT correlated well over a wide range, including the apnea-hypopnea index (AHI, r = 0.76, p < 0.001); respiratory disturbance index (RDI, r = 0.68, p < 0.001), mean oxygen saturation (r = 0.94, p < 0.001), and minimum oxygen saturation (r = 0.88, p < 0.001). The area under the curve for AHI ≥ 5 and RDI ≥ 10 were 0.96 and 0.94, respectively. Association between stage 3 sleep on PSG and deep sleep on Watch-PAT was poor. Watch-PAT tended to overscore RDI, particularly as severity increased. Among pregnant women, Watch-PAT demonstrates excellent sensitivity and specificity for identification of obstructive sleep apnea, defined as AHI ≥ 5 on full PSG. Watch-PAT may overestimate RDI somewhat, especially at high RDI values.