Scientific Investigations
Validation of Watch-PAT-200 Against Polysomnography During Pregnancy
http://dx.doi.org/10.5664/jcsm.1916
Louise M. O'Brien, Ph.D, M.S.1,2; Alexandra S. Bullough, M.B.Ch.B.3; Anita V. Shelgikar, M.D.1; Mark C. Chames, M.D.4; Roseanne Armitage, Ph.D.5; Ronald D. Chervin, M.D., M.S., F.A.A.S.M.1
1Sleep Disorders Center, Department of Neurology, University of Michigan, Ann Arbor, MI; 2Department of Oral & Maxillofacial Surgery, University of Michigan, Ann Arbor, MI; 3Department of Anesthesiology, University of Michigan, Ann Arbor, MI; 4Department of Obstetrics and Gynecology, University of Michigan, Ann Arbor, MI; 5Sleep and Chronophysiology Laboratory, Department of Psychiatry, University of Michigan, Ann Arbor, MI
Study Objectives:
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/m2; 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.
Citation:
O'Brien LM; Bullough AS; Shelgikar AV; Chames MC; Armitage R; Chervin RD. Validation of Watch-Pat-200 against polysomnography during pregnancy. J Clin Sleep Med 2012;8(3):287-294.
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