Pulse transit time extraction from Seismocardiogram and its relationship with pulse pressure

In this research Seismocardiogram (SCG) signal was used for timing the proximal pulse while pulse-plethysmogram (PPG) was used for timing the dorsal pulse for computing pulse transit time (PTT). Lower body negative pressure (LBNP) was applied for gradually reducing the pulse pressure in 9 subjects. The correlation between the pulse pressure and PTT derived using SCG was studied. It was determined that a significant correlation existed between PTT and pulse pressure for 7 out of the 9 subjects studied with an average significant correlation of 0.88±0.05. The results from this research show a potential application for a system including SCG and PPG to be used in an estimation or trending of pulse pressure.