Impedance cardiography for cuffless and non-invasive measurement of systolic blood pressure

In this study, we have used impedance cardiography to determine blood pressure (BP) cufflessly and non-invasively. We have devised a new parameter, QdZ [the duration measured from the foot of electrocardiogram (ECG) Q wave to the peak of impedance cardiogram (ICG)], for this purpose. Twenty-two subjects performed four minutes of treadmill exercise such that systolic BP (SBP) was increased significantly. We found that SBP was closely correlated with QdZ (R
²
= 0.65) demonstrating the potential application of ICG to cuffless and non-invasive BP measurement.