Key result
Noncontact monitoring using microwave radar sensors accurately estimated relative changes in blood pressure induced by cardiac output changes, demonstrating a high correlation (r = 0.884) with standard contact methods.
Why the study?
The study aimed to confirm whether noncontact monitoring of relative changes in blood pressure can be estimated using microwave radar sensors.
Does noncontact monitoring using microwave radar sensors accurately estimate relative changes in blood pressure compared to standard contact methods in healthy volunteers?
Observational (n=20)
No
Does noncontact monitoring using microwave radar sensors accurately estimate relative changes in blood pressure compared to standard contact methods in healthy volunteers?
Effect estimate: r = 0.884
p-value: p=0.247
Noncontact microwave radar sensors can estimate relative changes in blood pressure, particularly those driven by cardiac volume changes, offering a potential future method for unconstrained continuous hemodynamic monitoring.
May enable noncontact BP monitoring where contact is impractical; leaves open prospective validation before clinical adoption.
This study aims to confirm whether noncontact monitoring of relative changes in blood pressure can be estimated using microwave radar sensors. First, an equation to estimate blood pressure was derived, after which, the effectiveness of the estimation equation was confirmed using data obtained by a noncontact method while inducing variations in blood pressure. We considered that the Bramwell-Hill equation, which contains some parameters that directly indicate changes in blood pressure, would be an appropriate reference to construct an estimation equation for the noncontact method, because measurements using microwave radar sensors can measure minute scale motion on the skin surface induced by the pulsation of blood vessels. In order to estimate relative changes in blood pressure, we considered a simple equation including the pulse transit time (PTT), amplitude of signals and body dimensions as parameters. To verify the effectiveness of the equation for estimating changes in blood pressure, two experiments were conducted: a cycling task using an ergometer, which induces blood pressure fluctuations because of changes in cardiac output, and a task using the Valsalva maneuver, which induces blood pressure fluctuations because of changes in vascular resistance. The results obtained from the two experiments suggested that the proposed equation using microwave radar sensors can accurately estimate relative changes of blood pressure. In particular, relatively favorable results were obtained for the changes in blood pressure induced by the changes in cardiac volume. Although many issues remain, this method could be expected to contribute to the continuous evaluation of cardiac function while reducing the burden on patients.
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Suzuki et al. (2022) conducted an observational in Healthy (n=20). Noncontact monitoring using microwave radar sensors vs. Contact measurement methods (continuous sphygmomanometer and finger pressure monitor) was evaluated on Correlation of relative changes in pulse pressure between noncontact microwave radar and contact reference during an ergometer task (r = 0.884, p=0.247). Noncontact monitoring using microwave radar sensors accurately estimated relative changes in blood pressure induced by cardiac output changes, demonstrating a high correlation (r = 0.884) with standard contact methods.
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