Validation of Watch-PAT-200 against polysomnography during pregnancy.
OBJECTIVE
To determine the relationships between key variables obtained from ambulatory polysomnography (PSG) and the wrist-worn Watch-PAT 200 device in pregnant women.


METHODS
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.


RESULTS
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.


CONCLUSIONS
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.
Sleep Disorders Center, Department of Neurology, University of Michigan, Ann Arbor, MI, USA. louiseo@med.umich.edu
Louise M
LM
O'Brien
Alexandra S
AS
Bullough
Anita V
AV
Shelgikar
Mark C
MC
Chames
Roseanne
R
Armitage
Ronald D
RD
Chervin
D000328:Adult; D005260:Female; D006801:Humans; D017286:Polysomnography / Q000295:instrumentation*; D011247:Pregnancy / Q000502:physiology*; D011248:Pregnancy Complications / Q000175:diagnosis / Q000503:physiopathology; D011446:Prospective Studies; D012680:Sensitivity and Specificity; D016037:Single-Blind Method; D012890:Sleep / Q000502:physiology; D020181:Sleep Apnea, Obstructive / Q000150:complications / Q000175:diagnosis / Q000503:physiopathology