Intrinsic PPG-ECG Coupling for Accurate and Low-Power Blood Pressure Monitoring

Area of Science:

• Biomedical Engineering
• Cardiovascular Technology
• Wearable Health Devices

Background:

• Continuous blood pressure (BP) monitoring is crucial for cardiovascular disease management.
• Traditional BP monitoring using pulse transit time (PTT) often involves multiple signals, leading to synchronization errors and increased power consumption.
• Existing multi-signal BP monitoring systems face challenges in accuracy, efficiency, and system complexity.

Purpose of the Study:

• To develop an intrinsic signal synchronization strategy for accurate and efficient BP estimation.
• To overcome the limitations of conventional multi-signal BP monitoring methods.
• To create a simplified, low-power wearable sensor patch for continuous BP monitoring.

Main Methods:

• Proposed an intrinsic signal synchronization strategy by coupling photoplethysmography (PPG) and electrocardiogram (ECG) signals into a unified waveform.
• Developed a compact, lightweight chest wearable sensor patch based on this principle.
• Evaluated BP measurement accuracy under static and dynamic conditions.

Main Results:

• Achieved intrinsic synchronization, reducing pulse transit time (PTT) error to less than 15 ms with over 98% detection rate.
• Demonstrated a 43.75% decrease in system power consumption due to reduced data load.
• Reported high BP measurement accuracy (ME ≤ 5 mmHg, STD ≤ 8 mmHg) in diverse scenarios.

Conclusions:

• The proposed PPG-ECG signal coupling strategy simplifies BP monitoring device design and manufacturing.
• This intrinsic synchronization method significantly enhances the accuracy, energy efficiency, and operational lifetime of wearable BP monitors.
• The developed sensor patch offers a promising solution for long-term, continuous cardiovascular health assessment.