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Am J Perinatol
DOI: 10.1055/a-2422-9768
Original Article

Short-Acting Oral Nifedipine versus Intravenous Labetalol for the Control of Severe Hypertension in the Postpartum Period: A Retrospective Cohort Study

Whitney A. Booker 
1   Division of Maternal Fetal Medicine, Department of Obstetrics and Gynecology, Vagelos College of Physician and Surgeons, Columbia University, New York, New York
,
Shai Bejerano
1   Division of Maternal Fetal Medicine, Department of Obstetrics and Gynecology, Vagelos College of Physician and Surgeons, Columbia University, New York, New York
,
Anna Frappaolo
1   Division of Maternal Fetal Medicine, Department of Obstetrics and Gynecology, Vagelos College of Physician and Surgeons, Columbia University, New York, New York
,
Eliza C. Miller
2   Division of Stroke and Cerebrovascular Disease, Department of Neurology, Vagelos College of Physicians and Surgeons, Columbia University, New York, New York
,
Natalie A. Bello
3   Department of Cardiology, Smidt Heart Institute, Cedars Sinai Medical Center, Los Angeles, California
› Author Affiliations Funding N.A.B.: NIH/NHLBI K23-HL136853; W.A.B.: 5KL2TR001874-08, L30HD103088-01; E.C.M.: NIH/NINDS K23NS107645; S.B. was partially supported by NIH R01NS122449.
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Abstract

Objective This study aimed to compare the effectiveness of oral short-acting (SA) nifedipine with intravenous (IV) labetalol for the treatment of postpartum (PP) severe hypertension.

Study Design We conducted a retrospective cohort study of women who delivered at a tertiary care facility between January and December 2018, had not previously received antihypertensive medication, and required treatment for PP severe hypertension defined as systolic blood pressure (SBP) ≥ 160 mm Hg and/or diastolic blood pressure (DBP) ≥110 mm Hg. Exposure groups were defined by the receipt of either oral SA nifedipine or IV labetalol. The primary outcome was time (minutes) to BP control (SBP < 160 mm Hg and DBP <110 mm Hg). Secondary outcomes included number of doses required to achieve BP control, crossover to the alternative medication, and recurrence of severe range BP after the achievement of BP control. t-Tests and Wilcoxon–Mann–Whitney tests were used to analyze continuous variables and chi-square tests or Fisher's exact tests were used to analyze categorical variables. Multivariable linear regression models were conducted for the primary outcome, controlling for potential confounders in a sequential fashion across three models. A Kaplan–Meier plot was also created.

Results Of the 99 women included, 74 received oral SA nifedipine and 25 received IV labetalol. There was no significant difference in minutes to initial BP control between groups (30.5 minutes [interquartile range, IQR: 20.0–45.0] vs. 25.0 minutes [IQR: 14.0–50.0]; p = 0.82) or in the rate of recurrent severe BP. However, patients who received nifedipine required fewer doses to achieve control (p < 0.01) and did not require crossover (0 vs. 12%, p = 0.01).

Conclusion Both oral SA nifedipine and IV labetalol are effective options for treating PP severe hypertension. An initial choice of nifedipine was associated with a lower requirement for subsequent doses of medication and no need for crossover to an alternative antihypertensive medication.

Key Points

  • Nifedipine and labetalol effectively treat PP severe HTN.

  • Nifedipine requires fewer doses to treat PP severe HTN.

  • Both have low recurrence rates of severe HTN.

Keywords

blood pressure - postpartum - severe hypertension - nifedipine - labetalol

Note

These findings were presented in poster format at the 41st Annual Pregnancy Meeting, Society for Maternal-Fetal Medicine in Virtual Format.


Supplementary Material



Publication History

Received: 23 July 2024

Accepted: 26 September 2024

Article published online:
30 October 2024

© 2024. Thieme. All rights reserved.

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