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Clinical Trial
. 2012 Jun 15;8(3):287-94.
doi: 10.5664/jcsm.1916.

Validation of Watch-PAT-200 Against Polysomnography During Pregnancy

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Free PMC article
Clinical Trial

Validation of Watch-PAT-200 Against Polysomnography During Pregnancy

Louise M O'Brien et al. J Clin Sleep Med. .
Free PMC article

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.

Figures

Figure 1
Figure 1. Correlations between sleep time and respiratory measures from simultaneous Watch-PAT and full polysomnography (PSG) among habitually snoring subjects (closed circles and solid lines) and non-habitually snoring subjects (open circles and dashed lines)
Figure 2
Figure 2. Correlations between sleep stages as assessed by simultaneous Watch-PAT and full polysomnography (PSG) among habitually snoring subjects (closed circles and solid lines) and non-habitually snoring subjects (open circles and dashed lines)
Figure 3
Figure 3. Bland Altman plots showing the mean difference between PSG and Watch-PAT variables (solid line) and the 95% confidence intervals (broken lines) among habitually snoring subjects (closed circles) and non-habitually snoring subjects (open circles)
Figure 4
Figure 4. Receiver operator characteristic curves for apnea-hypopnea index (A) and respiratory disturbance index (B)

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