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Effect of Self-monitoring of Blood Pressure on Blood Pressure Control in Pregnant Individuals with Chronic or Gestational Hypertension: The BUMP 2 Randomized Clinical Trial

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Lucy C. Chappell, Katherine L. Tucker, Ushma Galal, Ly Mee Yu, Helen Campbell, Oliver Rivero-Arias, Julie Allen, Rebecca Band, Alison Chisholm, Carole Crawford, Greig Dougall, Lazarina Engonidou, Marloes Franssen, Marcus Green, Sheila Greenfield, Lisa Hinton, James Hodgkinson, Layla Lavallee, Paul Leeson, Christine McCourt & 8 more Lucy Mackillop, Jane Sandall, Mauro Santos, Lionel Tarassenko, Carmelo Velardo, Hannah Wilson, Lucy Yardley, Richard J. McManus

Original languageEnglish
Pages (from-to)1666-1678
Number of pages13
JournalJAMA - Journal of the American Medical Association
Issue number17
Published3 May 2022

Bibliographical note

Funding Information: reported receiving personal fees from Sensyne Health Group outside the submitted work; in addition, Dr Santos had a patent for University of Oxford Innovation Project 17725, BUMP– Technology License licensed to Sensyne Health Group. Dr Tarassenko reported receiving grants and personal fees (as a nonexecutive director and director of research and development) from Sensyne Health outside the submitted work. Dr Velardo reported being a full-time employee of Sensyne Health outside the submitted work; in addition, Dr Velardo had a patent for the University of Oxford Innovation Project 17725, BUMP– Technology License licensed to Sensyne Health Group. Dr McManus reported receiving other from Sensyne (the BUMP intervention was licensed by the University of Oxford for free during the COVID-19 pandemic and the university has received fees subsequently) during the conduct of the study and nonfinancial support from Omron (Omron licensed and paid consultancy to the University of Oxford with regard to a telemonitoring intervention developed with his help, and previously supplied blood pressure monitors for TASMINH4 study) and grants from the National Institute for Health Research (NIHR) outside the submitted work; and occasional travel and accommodation for speaking at conferences (any honoraria are paid to his institution). No other disclosures were reported. Funding Information: Funding/Support: This work was funded from a Publisher Copyright: © 2022 American Medical Association. All rights reserved.

King's Authors


Importance: Inadequate management of elevated blood pressure is a significant contributing factor to maternal deaths. The role of blood pressure self-monitoring in pregnancy in improving clinical outcomes for the pregnant individual and infant is unclear. Objective: To evaluate the effect of blood pressure self-monitoring, compared with usual care alone, on blood pressure control and other related maternal and infant outcomes, in individuals with pregnancy hypertension. Design, Setting, and Participants: Unblinded, randomized clinical trial that recruited between November 2018 and September 2019 in 15 hospital maternity units in England. Individuals with chronic hypertension (enrolled up to 37 weeks' gestation) or with gestational hypertension (enrolled between 20 and 37 weeks' gestation). Final follow-up was in May 2020. Interventions: Participants were randomized to either blood pressure self-monitoring using a validated monitor and a secure telemonitoring system in addition to usual care (n = 430) or to usual care alone (n = 420). Usual care comprised blood pressure measured by health care professionals at regular antenatal clinics. Main Outcomes and Measures: The primary maternal outcome was the difference in mean systolic blood pressure recorded by health care professionals between randomization and birth. Results: Among 454 participants with chronic hypertension (mean age, 36 years; mean gestation at entry, 20 weeks) and 396 with gestational hypertension (mean age, 34 years; mean gestation at entry, 33 weeks) who were randomized, primary outcome data were available from 444 (97.8%) and 377 (95.2%), respectively. In the chronic hypertension cohort, there was no statistically significant difference in mean systolic blood pressure for the self-monitoring groups vs the usual care group (133.8 mm Hg vs 133.6 mm Hg, respectively; adjusted mean difference, 0.03 mm Hg [95% CI, -1.73 to 1.79]). In the gestational hypertension cohort, there was also no significant difference in mean systolic blood pressure (137.6 mm Hg compared with 137.2 mm Hg; adjusted mean difference, -0.03 mm Hg [95% CI, -2.29 to 2.24]). There were 8 serious adverse events in the self-monitoring group (4 in each cohort) and 3 in the usual care group (2 in the chronic hypertension cohort and 1 in the gestational hypertension cohort). Conclusions and Relevance: Among pregnant individuals with chronic or gestational hypertension, blood pressure self-monitoring with telemonitoring, compared with usual care, did not lead to significantly improved clinic-based blood pressure control. Trial Registration: Identifier: NCT03334149.

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