A Pregnant Woman With New Snoring and Worsening Daytime Fatigue
A 32-year-old woman at 28 weeks' gestation presents with 2 months of loud snoring, witnessed gasping, and daytime fatigue. She has gained 9 kg this pregnancy. Prepregnancy BMI was 24; current BMI is 31. Blood pressure is 138/88 with new mild proteinuria being evaluated by obstetrics. She has no prior sleep history and no known hypertension. Fetal growth is currently appropriate. She asks whether she should 'wait until after delivery' to have a sleep study and whether any treatment is safe in pregnancy.
1. What is the differential and the appropriate diagnostic approach during pregnancy?
Read the worked answer
Differential:
- Obstructive sleep apnea - new snoring, witnessed gasping, weight gain, and elevated BMI in pregnancy are high-risk features; pregnancy itself increases OSA risk via weight gain, edema, and reduced functional residual capacity.
- Physiologic snoring of pregnancy - common in the third trimester, but witnessed gasping and fatigue argue against isolated benign snoring.
- Insomnia/fatigue of pregnancy and restless legs (screen ferritin).
Approach:
- Do not defer evaluation. Untreated OSA is associated with gestational hypertension, preeclampsia, and fetal growth restriction, so timely diagnosis matters.
- Home sleep apnea test is reasonable in a patient with high pretest probability and no significant cardiopulmonary comorbidity; in-office attended PSG is preferred if there is concern for central apnea, hypoventilation, or coexisting disease.
- Use pregnancy-adapted scoring awareness; AHI thresholds for treatment are often lower in pregnancy.
- Coordinate with obstetrics given the new proteinuria and blood pressure - evaluate for preeclampsia.
2. If OSA is confirmed, what treatment would you recommend, and what are the fetal and maternal considerations?
Read the worked answer
Treatment:
- CPAP is the first-line and safest therapy in pregnancy; it is not teratogenic and improves maternal oxygenation and sleep.
- Positional therapy (lateral sleep position) is a helpful adjunct and is also recommended for fetal safety.
- Weight management: avoid aggressive weight loss during pregnancy; focus on appropriate gestational weight gain.
- Mandibular advancement devices are an option if CPAP is not tolerated, but data in pregnancy are limited.
- Avoid pharmacologic sleep aids and stimulants; treat comorbid restless legs with iron if ferritin is low, in coordination with obstetrics.
Maternal/fetal considerations:
- Untreated OSA is linked to preeclampsia, gestational diabetes, and fetal growth restriction; treatment may reduce these risks.
- Monitor blood pressure and fetal growth; coordinate with obstetrics given current proteinuria.
- Reassess after delivery: OSA may improve with weight loss but often persists; plan a repeat evaluation postpartum.