Assessing PEP and LVET from Heart Sounds: Algorithms and Evaluation



This paper addresses the estimation of systolic time intervals, namely the pre-ejection period (PEP) and the left ventricular ejection time (LVET), using heart sound. PEP is estimated with a Bayesian approach resorting to the signal's instantaneous amplitude and typical time intervals between atrio-ventricular valve closure and aortic valve opening. As for LVET, aortic valve closure is determined through the analysis of a high-frequency signature of S2. Additionally, LVET has also been estimated from a PPG signal at a peripheral site, for the sake of comparison over a subset of data. We evaluated our algorithms on a set of 658 heartbeats and achieved 10.32 msec average absolute PEP estimation error with 7.3 msec standard deviation and for LVET, 15.8 msec average estimation error with 13.6 msec standard deviation. Current results support our as-sumption that heart sounds can be applied to detect the onset of the aortic valve movement processes.


heart sound processing


heart sound processing


EMBC\'2009, September 2009

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Year 2010 : 1 citations

 1. Reiter H. (2010). “HeartCycle: Beyond building demonstrators. A structured approach to develop, implement and validate healthcare innovations in telemonitoring”, Proceedings of the Int. Conf. of the IEEE Engineering in Medicine and Biology Society – EMBC’2010.