Blood pressure measurements with the OptiBP smartphone app validated against reference auscultatory measurements

101 adults (51 for training, 50 for validation) aged 18 years or older. Training set: patients scheduled for elective surgery necessitating general anaesthesia and invasive arterial BP monitoring. Validation set: patients scheduled for an elective visit at an outpatient hypertension clinic (normotensive, hypotensive, or hypertensive).

OptiBP smartphone app using the smartphone camera to acquire optical signals from the fingertip for pulse wave analysis (oBPM algorithm) to estimate blood pressure.

Simultaneously acquired reference measurements: invasive intra-arterial BP for the training set, and auscultatory systolic, diastolic, and mean blood pressure measurements using a dual-head stethoscope for the validation set.

Accuracy of smartphone-based blood pressure measurements (SBP, DBP, MBP) compared to reference auscultatory measurements, evaluated against the ISO 81060-2:2018 standard.surrogate