Blood Pressure Estimation
In this research we are exploring a Seismocardiogram (SCG) and Photoplethysmogram (PPG) signal as a marker of proximal pulse and distal pulse respectively for computing pulse transit time (PTT). PTT is a time taken by a pulse wave to travel from proximal site to the distal site, PTT being inversely proportional to blood pressure can be used for continuous estimation of blood pressure. Continuous monitoring of blood pressure is important for treatment of diseases such as hypertension. Figure 1 explains the data acquisition process, PTT computation algorithm and the results.
Figure 1. Experimental setup for data acquisition under LBNP condition (top left), PTT extraction using simultaneously recorded PPG (dashed) and SCG signals (top right), variation is pulse pressure with different LBNPstages (bottom left) and corresponding variation in PTT with different LBNP stages (bottom right).
 A. K. Verma, R. Fazel-Rezai, A. Blaber, and K. Tavakolian, “Pulse Transit Time Extraction from Seismocardiogram and its Relationship with Pulse Pressure”. Computing in Cardiology 2015.  A. K. Verma, R. Fazel-Rezai, J. M. Zanetti, and K. Tavakolian, “Preliminary Results for Estimating Pulse Transit Time using Seismocardiogram”. Journal of Medical Devices 2015, Vol 9 No. 2: 020916.