Pulse transit time (PTT) is the time it takes a pulse wave to travel between two arterial sites. The speed of this pulse is proportional to blood pressure and has been proposed to be used as an unobtrusive method of blood pressure measurement [1]. In such a measurement, one needs to take into account proximal and also distal measurements of the PTT. Pulseplethysmogram (PPG) has been proposed to measure the distal pulse, and electrocardiogram's (ECG) QRS wave has been used as an indicator of the proximal pulse. However, research has shown that using ECG as the proximal pulse indicator will cause errors in estimating the blood pressure, as it also includes the isovolumic contraction period [2].

In this work and for the first time, seismocardiogram (SCG) is introduced as the proximal pulse for measuring PTT [3]. SCG is the low frequency chest accelerations recorded...

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