Myocardial contractility: a seismocardiography approach.
Features are extracted from seismocardiogram data to correlate with two indexes of myocardial contractility: dP/dt(max) (maximum first derivative of left ventricular pressure) and stroke volume. In the first study on three pigs, it is shown that the time period between the R peak of the ECG and the first peak of the SCG (R-AO period or pre-ejection period, PEP) correlated (r= -0.86) with dP/dt(max). In the second study, stroke volume is gradually reduced in five human subjects using lower body negative pressure. The same feature as the pigs (R-AO) is correlated the most with stroke volume (r= -0.90).
Department of Electrical and Computer Engineering, University of British Columbia, Vancouver, BC, Canada. kouhyart@ece.ubc.ca
Kouhyar
K
Tavakolian
Gonzalo
G
Portacio
Niloufar R
NR
Tamddondoust
Graeme
G
Jahns
Brandon
B
Ngai
Guy A
GA
Dumont
Andrew P
AP
Blaber
D000328:Adult; D000818:Animals; D005260:Female; D006321:Heart / Q000502:physiology*; D006339:Heart Rate / Q000502:physiology; D006801:Humans; D008297:Male; D008991:Monitoring, Physiologic / Q000379:methods*; D009200:Myocardial Contraction / Q000502:physiology*; D012815:Signal Processing, Computer-Assisted; D013318:Stroke Volume / Q000502:physiology; D034421:Sus scrofa