Development and evaluation of a novel Vital Signs Alert device for use in pregnancy in low-resource settings

Hannah L. Nathan*, Nicola Vousden, Elodie Lawley, Annemarie De Greeff, Natasha L. Hezelgrave, Nicola Sloan, Nina Tanna, Shivaprasad S. Goudar, Muchabayiwa F. Gidiri, Jane Sandall, Lucy C. Chappell, Andrew H. Shennan

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

17 Citations (Scopus)


Objectives Haemorrhage, hypertension, sepsis and abortion complications (often from haemorrhage or sepsis) contribute to 60% of all maternal deaths. Each is associated with vital signs (blood pressure (BP) and pulse) abnormalities, and the majority of deaths are preventable through simple and timely intervention. This paper presents the development and evaluation of the CRADLE Vital Signs Alert (VSA), an accurate, low-cost and easy-To-use device measuring BP and pulse with an integrated traffic light early warning system. The VSA was designed to be used by all cadres of healthcare providers for pregnant women in low-resource settings with the aim to prevent avoidable maternal mortality and morbidity. Methods The development and the mixed-methods clinical evaluation of the VSA are described. Results Preliminary fieldwork identified that introduction of BP devices to rural clinics improved antenatal surveillance of BP in pregnant women. The aesthetics of the integrated traffic light system were developed through iterative qualitative evaluation. The traffic lights trigger according to evidence-based vital sign thresholds in hypertension and haemodynamic compromise from haemorrhage and sepsis. The VSA can be reliably used as an auscultatory device, as well as its primary semiautomated function, and is suitable as a self-monitor used by pregnant women. Conclusion The VSA is an accurate device incorporating an evidence-based traffic light early warning system. It is designed to ensure suitability for healthcare providers with limited training and may improve care for women in pregnancy, childbirth and in the postnatal period.

Original languageEnglish
Pages (from-to)192-198
Number of pages7
JournalBMJ Innovations
Issue number4
Publication statusPublished - 1 Oct 2018


  • affordable
  • diagnostics
  • global Health
  • hypertension
  • obstetrics


Dive into the research topics of 'Development and evaluation of a novel Vital Signs Alert device for use in pregnancy in low-resource settings'. Together they form a unique fingerprint.

Cite this