Key result
A novel magnetoelastic skin curvature sensor combined with ECG estimated blood pressure with cross-correlation coefficients of 0.8-0.9 and an estimation error below 4 +/- 7 mmHg at rest.
Why the study?
Does a novel magnetoelastic skin curvature sensor combined with ECG accurately estimate continuous blood pressure?
Does a novel magnetoelastic skin curvature sensor combined with ECG accurately estimate continuous blood pressure?
Effect estimate: Cross correlation coefficients 0.8 to 0.9
A novel magnetoelastic skin curvature sensor combined with ECG offers a continuous, nondisturbing approach for monitoring blood pressure changes with acceptable accuracy at rest.
May enable cuffless continuous BP monitoring; leaves open validation before clinical adoption.
This paper concerns continuous nondisturbing estimation of blood pressure using mechanical plethysmography in connection with standard electrocardiography (ECG). The plethysmography is given by a novel magnetoelastic skin curvature sensor (SC-sensor) applied on the neck over the carotid artery. The sensor consists of a magnetoelastic bilayer partly enclosed by a coil. Bending the bilayer causes large changes of magnetic permeability which can be measured by the coil. The SC-sensor signal and the ECG signal are adaptively processed in order to estimate blood pressure according to a specifically established theoretical model. The model uses estimated vessel radius changes and pulse transit time as parameters. The results show cross correlation coefficients in the range 0.8 up to 0.9 between reference and estimated values of systolic blood pressure, diastolic blood pressure, and systolic/diastolic blood pressure change, whereas the estimation error was below 4 +/- 7 mmHg at rest and increased with the stress level. Limitations of the model applicability are given by a hysteretic behavior of both model parameters due to inert changes in artery stiffness. The SC-sensor and the ECG electrodes cause minimal inconvenience to the patient and offer an approach for a continuous nondisturbing monitoring of blood pressure changes, as being relevant for sleep monitoring or biomechanic feedback
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Kaniušas et al. (2006) studied Blood pressure monitoring. Magnetoelastic skin curvature sensor (SC-sensor) and ECG vs. Reference blood pressure values was evaluated on Accuracy of systolic and diastolic blood pressure estimation (Cross correlation coefficients 0.8 to 0.9). A novel magnetoelastic skin curvature sensor combined with ECG estimated blood pressure with cross-correlation coefficients of 0.8-0.9 and an estimation error below 4 +/- 7 mmHg at rest.
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