Loss of lag-response curvilinearity of indices of heart rate variability in congestive heart failure.

ABSTRACT:

Background

Heart rate variability (HRV) is known to be impaired in patients with congestive heart failure (CHF). Time-domain analysis of ECG signals traditionally relies heavily on linear indices of an essentially non-linear phenomenon. Poincaré plots are commonly used to study non-linear behavior of physiologic signals. Lagged Poincaré plots incorporate autocovariance information and analysis of Poincaré plots for various lags can provide interesting insights into the autonomic control of the heart.

Methods

Using Poincaré plot analysis, we assessed whether the relation of the lag between heart beats and HRV is altered in CHF. We studied the influence of lag on estimates of Poincaré plot indices for various lengths of beat sequence in a public domain data set (PhysioNet) of

SUBMITTER: Thakre TP 

PROVIDER: S-EPMC1523370 | biostudies-literature | 2006 Jun

REPOSITORIES: biostudies-literature