We previously showed that masked hypertension is a frequent finding in high-risk pregnancies and a strong predictor of preeclampsia/eclampsia. However, neonatal consequences of masked hypertension have not been deeply analyzed. Consequently, the aim of this study was to determine if masked hypertension is a risk factor for poor neonatal outcome. We evaluated a cohort of 588 high-risk pregnant women (29 ± 7 years old with 27 ± 6 weeks of gestation at blood pressure evaluation); 22.1%, 8.5%, 2.9%, and 2.6% had history of hypertension, diabetes, collagen diseases and chronic renal disease, respectively. According to the data of office and ambulatory blood pressures monitoring, women was classified as normotension (61.7%), white-coat hypertension (5.4%), masked hypertension (21.6%) and sustained hypertension (11.2%) respectively. Compared to normotension, all neonatal outcomes were worst in women with masked hypertension; neonates had lower mean birth weight (2577 (842) vs. 3079 (688) g, P < 0.001), higher prevalence of very low (12.1% vs 2.0%, P = .002) and extremely low birth weight (4.3% vs 0%, P < 0.001), and low one-minute APGAR score (7.8% vs 1.8%, P < 0.001). Furthermore, 14.2% needed admission to neonatal intensive care unit (NICE) (P = 0.001). Compared with normotension the risk for poor the combined neonatal outcome (admission to NICE plus still born) was significantly higher in masked hypertension (adjusted OR 2.58 95% CI 1.23-5.40) but not in white-coat hypertension (adjusted OR 0.41 95% CI 0.05-3.12). In conclusion, in high-risk pregnancies, masked hypertension was a strong and independent predictor for poor neonatal outcomes.
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