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

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 (BP WRIST-ART ) and the Biobeat chest monitor (BP CHEST-ART ) with intra-arterial blood pressure measurements (BP ART ). In addition, we aimed to compare blood pressure measurements from the Biobeat wrist monitor (BP WRIST-OSCI ) with those from an oscillometric upper-arm cuff (BP OSCI ). 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 BP WRIST-ART and BP ART 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 BP CHEST-ART and BP ART 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 BP WRIST-OSCI and BP OSCI 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.