Non-invasive estimation of pressure at the heart is dependant on a BP cuff device measurement of BP at the arm, which differs from the invasive measurement of BP, thereby producing error in the estimation. This patent reduces the error and improves the accuracy of the non-invasive estimation of BP at the heart, which is more relevant to cardiac function and arterial properties than BP at the arm.

Blood pressure at the arm as measured by a conventional BP cuff device is different from BP measured invasively in the brachial artery at the arm. This patent is a non-invasive method to estimate the more accurate and invasively measured BP by using BP cuff waveform. It can be implemented in BP cuff devices to improve their accuracy.