Related Experiment Video
Updated: Jul 6, 2025
Measuring Blood Pressure in Mice using Volume Pressure Recording, a Tail-cuff Method
Published on: May 15, 2009
Assessment of a Calibration-Free Method of Cuffless Blood Pressure Measurement: A Pilot Study
Cheng-Yan Guo1, Chia-Chi Chang2, Kuan-Jen Wang1
1Accurate Meditech Inc. New Taipei City 241406 Taiwan.
Abstract:
This study proposes a low-cost, high-sensitivity sensor of beat-to-beat local pulse wave velocity (PWV), to be used in a cuffless blood pressure monitor (BPM).
Objective:
We design an adaptive algorithm to detect the feature of the pulse wave, making it possible for two sensors to measure the local PWV in the radial artery at a short distance. Unlike the cuffless BPM that needs to use a regression model for calibration.
Method:
We encapsulate the piezoelectric sensor material in a cavity and design an analog front-end circuit. This study used color ultrasound imaging equipment to measure radial arterial parameters, including the diameter and wall thickness, to aid the estimation of blood pressure (BP) using the Moens-Korteweg (MK) equation of hemodynamics.
Results:
We compared the blood pressure estimated by the MK equation with the reference BP measured using an aneroid sphygmomanometer in a test group of 32 people, resulting in a mean difference of systolic BP of -0.63 mmHg, and a standard deviation of ±5.14 mmHg, a mean difference of mean arterial pressure (MAP) of 0.97 mmHg, with a standard deviation of ±3.54 mmHg, and a mean difference of diastolic BP of -1.14 mmHg, with a standard deviation of ±4.08 mmHg. This study has verified its compliance with ISO 81060-2.
Conclusions:
A new type of wearable continuous calibration-free BPM can replace the situation that requires the use of traditional ambulatory BPM and reduce patient discomfort.
Clinical Impact:
In this study can provide long-term continuous blood pressure monitoring in the hospital.
Related Concept Videos
01:21Sites for measruring blood pressure
The Brachial Artery: Primary Site for Blood Pressure Measurement
01:30Equipments Used To Measure Blood Pressure
This invasive approach involves cannulating a peripheral artery. During each cardiac contraction, pressure generates mechanical motion within the catheter, transmitted through rigid, fluid-filled tubing to a transducer. This transducer converts mechanical motion into electrical signals displayed as waveforms on a monitor. An automatic flushing system prevents blood backflow. Due to the potential risk of unexpected arterial blood loss, this method is primarily used in intensive...
01:23Assessment of blood pressure in brachial artery(two-step method)
01:17Measurement of Blood Pressure
01:28Special considerations while measuring blood pressure
Monitoring Both Arms:
Monitoring BP in both arms during the initial assessment is advisable, as the systolic value may differ by five to ten mm Hg between arms. For subsequent BP assessments, use the arm with the higher reading.
01:10Pre-Procedural Guidelines for Assessing Blood Pressure