Key result
The OptiBP smartphone application met ISO 81060-2:2018 accuracy standards for blood pressure estimation in general and pregnant populations, except for systolic blood pressure in Bangladesh.
Why the study?
Undetected and unmonitored hypertension carries substantial mortality and morbidity, especially during pregnancy, prompting evaluation of the accuracy of a smartphone application for blood pressure estimation across diverse settings.
Does the OptiBP smartphone application accurately estimate blood pressure compared to standard auscultatory cuff measurements in general and pregnant populations in low- and middle-income countries?
Observational (n=351)
Blinded
Yes
Does the OptiBP smartphone application accurately estimate blood pressure compared to standard auscultatory cuff measurements in general and pregnant populations in low- and middle-income countries?
The OptiBP smartphone application demonstrated acceptable accuracy for blood pressure estimation against ISO standards in pregnant and general populations in LMICs, though further refinement is needed for systolic blood pressure estimation in some populations.
Undetected and unmonitored hypertension carries substantial mortality and morbidity, especially during pregnancy. We assessed the accuracy of OptiBP TM , a smartphone application for estimating blood pressure (BP), across diverse settings. The study was conducted in community settings: Gaibandha, Bangladesh and Ifakara, Tanzania for general populations, and Kalafong Provincial Tertiary Hospital, South Africa for pregnant populations. Based on guidance from the International Organization for Standardization (ISO) 81,060–2:2018 for non-invasive BP devices and global consensus statement, we compared BP measurements taken by two independent trained nurses on a standard auscultatory cuff to the BP measurements taken by a research version of OptiBP TM called CamBP. For ISO criterion 1, the mean error was 0.5 ± 5.8 mm Hg for the systolic blood pressure (SBP) and 0.1 ± 3.9 mmHg for the diastolic blood pressure (DBP) in South Africa; 0.8 ± 7.0 mmHg for the SBP and −0.4 ± 4.0 mmHg for the DBP in Tanzania; 3.3 ± 7.4 mmHg for the SBP and −0.4 ± 4.3 mmHg for the DBP in Bangladesh. For ISO criterion 2, the average standard deviation of the mean error per subject was 4.9 mmHg for the SBP and 3.4 mmHg for the DBP in South Africa; 6.3 mmHg for the SBP and 3.6 mmHg for the DBP in Tanzania; 6.4 mmHg for the SBP and 3.8 mmHg for the DBP in Bangladesh. OptiBP TM demonstrated accuracy against ISO standards in study populations, including pregnant populations, except in Bangladesh for SBP (criterion 2). Further research is needed to improve performance across different populations and integration within health systems.
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Festo et al. (2023) conducted an observational in Blood pressure estimation (n=351). OptiBP smartphone application vs. Standard auscultatory cuff was evaluated on Accuracy of blood pressure estimation based on ISO 81060-2:2018 criteria (mean error and standard deviation). The OptiBP smartphone application met ISO 81060-2:2018 accuracy standards for blood pressure estimation in general and pregnant populations, except for systolic blood pressure in Bangladesh.
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