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Am J Physiol Heart Circ Physiol 283: H1873-H1886, 2002; doi:10.1152/ajpheart.00405.2000
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Vol. 283, Issue 5, H1873-H1886, November 2002

Poincaré plot interpretation using a physiological model of HRV based on a network of oscillators

Michael Brennan1, Marimuthu Palaniswami1, and Peter Kamen2

1 Department of Electrical and Electronic Engineering, University of Melbourne, Parkville, Victoria 3010; and 2 Department of Cardiology, Austin Hospital, Melbourne, Victoria 3084, Australia

In this paper, we develop a physiological oscillator model of which the output mimics the shape of the R-R interval Poincaré plot. To validate the model, simulations of various nervous conditions are compared with heart rate variability (HRV) data obtained from subjects under each prescribed condition. For a variety of sympathovagal balances, our model generates Poincaré plots that undergo alterations strongly resembling those of actual R-R intervals. By exploiting the oscillator basis of our model, we detail the way that low- and high-frequency modulation of the sinus node translates into R-R interval Poincaré plot shape by way of simulations and analytic results. With the use of our model, we establish that the length and width of a Poincaré plot are a weighted combination of low- and high-frequency power. This provides a theoretical link between frequency-domain spectral analysis techniques and time-domain Poincaré plot analysis. We ascertain the degree to which these principles apply to real R-R intervals by testing the mathematical relationships on a set of data and establish that the principles are clearly evident in actual HRV records.

heart rate variability; quantitative beat-to-beat analysis


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