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J Clin Sleep Med. 2012 Jun 15;8(3):287-94. doi: 10.5664/jcsm.1916.

Validation of Watch-PAT-200 against polysomnography during pregnancy.

Author information

1
Sleep Disorders Center, Department of Neurology, University of Michigan, Ann Arbor, MI, USA. louiseo@med.umich.edu

Abstract

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/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.

KEYWORDS:

Pregnancy; Watch-PAT; obstructive; sleep apnea

PMID:
22701386
PMCID:
PMC3365087
DOI:
10.5664/jcsm.1916
[Indexed for MEDLINE]
Free PMC Article
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