We identified OSA in 37% and 50% of women with class III obesity in the second and third trimesters, respectively. These results provide a unique account of the prevalence of OSA among pregnant women with the most severe class of obesity and add to the growing body of evidence that OSA is common among pregnant women with obesity. It is interesting to consider our results in the context of previous studies that have used the gold standard technique of in-lab polysomnography (PSG) to diagnose OSA in women with obesity. Ghesquiere et al 18 evaluated 67 pregnant women with BMI ≥35 kg/m2 between 24 to 32 weeks gestation and identified OSA in 43.4% of participants. Approximately one-fifth of participants in this study had a history of chronic hypertension or pregestational diabetes and 9% had both.
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