Rapid assessment of cardiac contractility on a home bathroom scale

Mozziyar Etemadi*, Omer T. Inan, Laurent Giovangrandi, Gregory T A Kovacs

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

72 Scopus citations


Analyzing systolic time intervalsspecifically the preejection-period (PEP)is widely accepted as one of the few methods for the noninvasive assessment of cardiac contractility. In this paper, we investigated the ballistocardiogram (BCG) as a way to noninvasively measure myocardial contractility when combined with the ECG. Specifically, we derived a parameter from the BCG and ECG that we hypothesized would be highly correlated to PEP. This is the time delay between the J-wave peak of the BCG and the R-wave of the ECG, which we refer to as the RJ interval. The RJ interval was correlated to PEP (r2 = 0.86) for 2126 heartbeats across ten subjects, with a y-intercept of 138 ms and slope of 1.05. This suggests that the RJ interval can be reliably used as a noninvasive assessment of cardiac contractility.

Original languageEnglish (US)
Article number5982400
Pages (from-to)864-869
Number of pages6
JournalIEEE Transactions on Information Technology in Biomedicine
Issue number6
StatePublished - Nov 2011


  • Ballistocardiography (BCG)
  • contractility
  • home monitoring
  • noninvasive cardiac monitoring

ASJC Scopus subject areas

  • Biotechnology
  • Computer Science Applications
  • Electrical and Electronic Engineering

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