Development of a Cuff-Less Blood Pressure Monitoring System and Its Application.

Area of Science:

• Biomedical Engineering
• Cardiovascular Technology
• Physiological Monitoring

Background:

• Continuous blood pressure (BP) monitoring is crucial for managing cardiovascular health.
• Traditional cuff-based methods are obtrusive and unsuitable for long-term use.
• Development of cuff-less BP monitoring technologies is an active area of research.

Purpose of the Study:

• To develop and evaluate an unobtrusive, cuff-less sphygmomanometer for continuous blood pressure estimation.
• To assess the accuracy of the developed device against a standard cuff-type sphygmomanometer.
• To explore the potential of simultaneous cuff-less BP and near-infrared spectroscopy monitoring for autonomic nervous system assessment.

Main Methods:

• A cuff-less sphygmomanometer was developed using contact-type and optical pulse sensors.
• Pulse arrival time (PAT) was utilized as the primary parameter for BP estimation.
• Accuracy was validated against a standard cuff-type device in 10 healthy subjects.
• Simultaneous monitoring with near-infrared spectroscopy was performed during mental stress tasks.

Main Results:

• The cuff-less device demonstrated a mean difference of 0.96 ± 9.6 mmHg for systolic BP and 1.14 ± 7.5 mmHg for diastolic BP compared to the control.
• Significant correlations were found between estimated and control BP values (r=0.78 for systolic, r=0.69 for diastolic, p < 0.01).
• Preliminary findings suggest the device's potential for continuous BP monitoring and autonomic function assessment.

Conclusions:

• The developed cuff-less sphygmomanometer shows promise for accurate and continuous blood pressure monitoring.
• The technology offers a minimally invasive alternative to traditional methods.
• Further research is warranted to explore its application in assessing autonomic nervous system functions.