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Pulse transit time (PTT) has been widely used for cuffless blood pressure(BP) measurement. But, it requires more than one cardiovascular signalsinvolving more than one sensing device. In this paper, we propose a method forcontinuous cuffless blood pressure measurement with the help of leftventricular ejection time (LVET). The LVET is estimated using a signal obtainedthrough a micro-electromechanical system (MEMS)-based accelerometric sensor.The sensor acquires a seismocardiogram (SCG) signal at the chest surface, andthe LVET information is extracted. Both systolic blood pressure (SBP) anddiastolic blood pressure (DBP) are estimated by calibrating the system with theoriginal arterial blood pressure values of the subjects. The proposed method isevaluated using different quantitative measures on the signals collected fromten subjects under the supine position. The performance of the proposed methodis also compared with two earlier approaches, where PTT intervals are estimatedfrom electrocardiogram (ECG)-photoplethysmogram (PPG) and SCG-PPG,respectively. The performance results clearly show that the proposed method iscomparable with the state-of-the-art methods. Also, the computed blood pressureis compared with the original one, measured through a CNAP system. It gives themean errors of the estimated systolic BP and diastolic BP within the range of-0.19 +/- 3.3 mmHg and -1.29 +/- 2.6 mmHg, respectively. The mean absoluteerrors for systolic BP and diastolic BP are 3.2 mmHg and 2.6 mmHg,respectively. The accuracy of BPs estimated from the proposed method satisfiesthe requirements of the IEEE standard of 5 +/- 8 mmHg deviation, and thus, itmay be used for ubiquitous long term blood pressure monitoring.

Accelerometric Method for Cuffless Continuous Blood Pressure Measurement