Continuous noninvasive blood pressure monitoring with wearable photoplethysmography: A method comparison study in high-risk patients recovering from noncardiac surgery.

Abstract

Background: The Biobeat wrist monitor (BB-613W; Biobeat Technologies, Petah-Tikva, Israel) and the Biobeat chest monitor (BB-613P; Biobeat Technologies) are wearable solutions for continuous noninvasive blood pressure monitoring.

Objectives: We aimed to investigate the blood pressure measurement performance of the Biobeat wrist monitor and chest monitor after external calibration.

Design: A prospective method comparison study.

Setting: University Medical Center Hamburg-Eppendorf, Hamburg, Germany.

Patients: Fifty high-risk patients recovering from noncardiac surgery in an advanced postanaesthesia care unit.

Main outcome measures: We compared blood pressure measurements from the Biobeat wrist monitor (BPWRIST-ART) and the Biobeat chest monitor (BPCHEST-ART) with intra-arterial blood pressure measurements (BPART). In addition, we aimed to compare blood pressure measurements from the Biobeat wrist monitor (BPWRIST-OSCI) with those from an oscillometric upper-arm cuff (BPOSCI). We used Bland-Altman analysis, four-quadrant plot and error grid analysis for statistical analysis.

Results: The mean of the differences ± standard deviation (95%-limits of agreement) between BPWRIST-ART and BPART was 3 ± 11 mmHg (-19 to 25 mmHg) for mean blood pressure with a concordance rate to track 15-min blood pressure changes of 51%. The mean of the differences between BPCHEST-ART and BPART was 3 ± 11 mmHg (-17 to 24 mmHg) for mean blood pressure with a concordance rate to track 15-min blood pressure changes of 61%. The mean of the differences between BPWRIST-OSCI and BPOSCI was 6 ± 11 mmHg (-16 to 27 mmHg) for mean blood pressure with a concordance rate to track 15-min blood pressure changes of 49%.

Conclusions: Blood pressure measurements from the Biobeat wrist monitor and the Biobeat chest monitor did not show clinically acceptable agreement either with intra-arterial blood pressure measurements or with blood pressure measurements from an oscillometric upper-arm cuff in high-risk patients recovering from noncardiac surgery in an advanced postanaesthesia care unit.