Enhancing the pulse contour analysis-based arterial stiffness estimation using a novel photoplethysmographic...

Area of Science:

• Biomedical Engineering
• Cardiovascular Physiology
• Medical Diagnostics

Background:

• Arterial stiffness is a key indicator of cardiovascular health.
• Accurate and accessible methods for arterial stiffness estimation are crucial for early disease detection.
• Photoplethysmography (PPG) offers a non-invasive approach for cardiovascular monitoring.

Purpose of the Study:

• To introduce a novel, low-complexity photoplethysmographic parameter (P2Ocd) for enhanced arterial stiffness estimation.
• To validate the P2Ocd parameter against established methods like brachial-ankle pulse wave velocity.
• To assess the predictive accuracy and repeatability of the P2Ocd-based arterial stiffness measurement.

Main Methods:

• A novel method using a simple morphological filter to remove baseline wander from digital volume pulse (DVP) signals.
• Transformation of the filtered DVP into a slope sum function signal for simplified pulse peak detection.
• Adaptive thresholding for pulse peak identification and minimum value detection for pulse onset identification.
• Calculation of the P2Ocd parameter and subsequent Bland-Altman and correlation analyses against brachial-ankle pulse wave velocity.

Main Results:

• The P2Ocd parameter demonstrated good agreement with the established brachial-ankle pulse wave velocity technique.
• Arterial stiffness estimation using P2Ocd showed high repeatability (low coefficient of variation).
• The P2Ocd method exhibited superior predictive accuracy compared to conventional techniques, further improved by incorporating age.

Conclusions:

• The proposed P2Ocd parameter offers a simple, accurate, and repeatable method for arterial stiffness estimation.
• Its low complexity and high performance make it highly applicable for integration into small, ubiquitous healthcare devices.
• This advancement holds significant potential for non-invasive cardiovascular health monitoring and early detection of arterial stiffening.