Cuffless Blood Pressure Estimation Using Pulse Transit Time and Photoplethysmogram Intensity Ratio

Area of Science:

• Biomedical Engineering
• Cardiovascular Technology
• Medical Monitoring

Background:

• High blood pressure (BP) is a major risk factor for severe cardiovascular and kidney diseases.
• Current BP monitoring methods often rely on uncomfortable cuffs and cannot provide continuous data.
• Accurate, continuous, cuffless BP monitoring is crucial for effective hypertension management.

Purpose of the Study:

• To develop and validate a novel multi-parameter fusion method for continuous, cuffless BP monitoring.
• To overcome the limitations of existing Pulse Transit Time (PTT) methods in tracking low-frequency BP variations.
• To enable more precise estimation of both systolic and diastolic BP.

Main Methods:

• Utilized photoplethysmogram (PPG) and two-lead electrocardiogram (ECG) signals.
• Developed a new algorithm integrating Pulse Transit Time (PTT) and Pulse Intensity Ratio (PIR).
• Applied multi-parameter fusion to track BP changes in both high and low frequencies.

Main Results:

• The proposed method successfully tracked BP variations across both high and low frequencies.
• Achieved continuous estimation of systolic and diastolic blood pressure.
• Demonstrated a viable alternative to traditional cuff-based BP measurement techniques.

Conclusions:

• The multi-parameter fusion approach offers a promising solution for continuous, cuffless BP monitoring.
• This method enhances the ability to track true BP changes, improving hypertension detection and management.
• Further research can refine this technique for widespread clinical application.