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Blood pressure measurement in noise intensive environments using adaptive interference cancellation
Lisa Pinto1, Amar Dhanantwari, Winnie Wong
1Department of Electrical and Computer Engineering, University of Western Ontario, London, Canada.
Annals of Biomedical Engineering
|July 11, 2002
Summary
A new adaptive blood pressure monitoring (ABPM) system effectively measures systolic-diastolic pressure in noisy, vibrating conditions. This innovation overcomes limitations of traditional methods in challenging environments.
Area of Science:
- Biomedical Engineering
- Physiological Measurement
- Signal Processing
Background:
- Traditional blood pressure measurement techniques (auscultatory) are unreliable in environments with significant vibration or acoustic noise.
- Existing methods face limitations in accurately determining systolic-diastolic pressure under extreme environmental interference.
- Need for a robust blood pressure monitoring solution for challenging conditions, such as search and rescue operations.
Purpose of the Study:
- To evaluate the effectiveness of a novel adaptive blood pressure monitoring (ABPM) system.
- To determine the system's capability in measuring human systolic-diastolic pressure in intense vibration and noise environments.
- To demonstrate the ABPM system's utility where conventional methods fail.
Main Methods:
- Development of an adaptive blood pressure monitoring (ABPM) system utilizing two acoustic sensors within the pressure cuff.
- Primary sensor placed on the brachial artery to capture Korotkoff sounds; secondary sensor placed externally to record ambient noise and vibration.
- Implementation of an adaptive interference canceller to filter noise from the primary sensor's signal.
- Clinical testing in two phases: a controlled noiseless environment and a high-noise environment (near/onboard search and rescue helicopters).
Main Results:
- The ABPM system successfully acquired blood pressure readings in both controlled and high-noise environments.
- Demonstrated significant noise and vibration cancellation capabilities, preserving the integrity of Korotkoff sound signals.
- Clinical testing confirmed the system's effectiveness in environments where traditional auscultatory methods are compromised.
Conclusions:
- The novel adaptive blood pressure monitoring (ABPM) system is effective for measuring blood pressure in challenging, noisy, and vibrating conditions.
- The system's adaptive interference cancellation technology overcomes the limitations of conventional blood pressure monitoring.
- This technology offers a viable solution for accurate physiological monitoring in previously inaccessible environments.