Implantable acceleration plethysmography for blood pressure determination

Area of Science:

• Biomedical Engineering
• Cardiovascular Physiology
• Medical Devices

Background:

• Continuous blood pressure monitoring is crucial for managing cardiovascular health.
• Existing methods for blood pressure monitoring have limitations in continuous, long-term application.
• Arterial plethysmography offers a potential non-invasive or minimally invasive approach.

Purpose of the Study:

• To introduce an implantable accelerometer for direct arterial plethysmogram detection.
• To evaluate the sensor's capability for continuous blood pressure monitoring.
• To assess the correlation of Pulse Transit Time (PTT) and Reflected Wave Transit Time (RWTT) with systolic blood pressure.

Main Methods:

• Development of an implantable accelerometer sensor.
• In vivo measurements of arterial plethysmograms.
• Calculation and analysis of Pulse Transit Time (PTT) and Reflected Wave Transit Time (RWTT).
• Correlation analysis between transit times and blood pressure variations.

Main Results:

• The accelerometer successfully detected arterial plethysmograms.
• Both PTT and RWTT showed high correlation with systolic blood pressure.
• RWTT demonstrated closer agreement with theoretical predictions compared to PTT.
• RWTT, measured by the accelerometer, showed a 0.96 correlation coefficient and 4.3% mean deviation with systolic blood pressure over 1800 pulses.

Conclusions:

• The implantable accelerometer is a promising tool for continuous blood pressure monitoring.
• RWTT derived from accelerometer data is a reliable indicator of systolic blood pressure.
• This technology offers a new avenue for advanced cardiovascular monitoring.