A PPG-Based Calibration-Free Cuffless Blood Pressure Estimation Method Using Cardiovascular Dynamics.

Area of Science:

• Biomedical Engineering
• Cardiovascular Monitoring
• Medical Devices

Background:

• Traditional cuff-based sphygmomanometers are uncomfortable and impractical for sleep monitoring.
• Existing cuffless methods often require calibration, limiting their convenience.

Purpose of the Study:

• To develop and validate a calibration-free method for blood pressure estimation using photoplethysmogram (PPG) morphology.
• To assess the accuracy of PPG morphology features in replacing the calibration stage for cuffless blood pressure monitoring.

Main Methods:

• Utilized dynamic changes in pulse waveform and PPG morphology over short intervals.
• Replaced traditional calibration with PPG morphology information for a single-sensor approach.
• Validated the method on a cohort of 200 patients and tested on 25 new patients.

Main Results:

• Initial results on 30 patients showed high correlations: 73.64% for systolic blood pressure (SBP) and 77.72% for diastolic blood pressure (DBP).
• Extensive testing on 200+ patients yielded low mean errors (ME) and mean absolute errors (MAE): DBP (ME: -0.31 mmHg, MAE: 3.32 mmHg) and SBP (ME: -4.02 mmHg, MAE: 7.41 mmHg).
• The PPG morphology features demonstrated comparable accuracy to calibration-based methods.

Conclusions:

• The proposed PPG morphology-based method offers a viable calibration-free approach for cuffless blood pressure estimation.
• This technique has the potential to enhance accuracy in cuffless blood pressure monitoring by incorporating cardiovascular dynamics.
• The findings support the development of more comfortable and continuous blood pressure monitoring solutions.