Key result
The RJ interval derived from the ballistocardiogram and ECG was highly correlated with the preejection-period (r^2 = 0.86), suggesting its reliability for noninvasive assessment of contractility.
Why the study?
Does the RJ interval derived from a ballistocardiogram and ECG correlate with the preejection-period for noninvasive assessment of cardiac contractility?
Observational (n=10)
Does the RJ interval derived from a ballistocardiogram and ECG correlate with the preejection-period for noninvasive assessment of cardiac contractility?
Effect estimate: r^2 = 0.86
The RJ interval derived from a ballistocardiogram and ECG correlates strongly with the preejection-period, suggesting it could be used for noninvasive assessment of cardiac contractility.
May support noninvasive contractility assessment; leaves open clinical utility pending prospective validation.
Analyzing systolic time intervals-specifically 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 (r(2) = 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.
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Etemadi et al. (2011) reported an observational. RJ interval derived from ballistocardiogram (BCG) and ECG vs. Preejection-period (PEP) was evaluated on Correlation between RJ interval and PEP (r^2 = 0.86). The RJ interval derived from the ballistocardiogram and ECG was highly correlated with the preejection-period (r^2 = 0.86), suggesting its reliability for noninvasive assessment of contractility.
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