Abnormalities in fractal heart rate dynamics in Chagas disease.

Annals of Noninvasive Electrocardiology : the Official Journal of the International Society for Holter and Noninvasive Electrocardiology, Inc
Marcos Roberto de SousaAntonio Luiz P Ribeiro

Abstract

In order to study fractal HR dynamics in Chagas disease, we performed detrended fluctuation analysis (DFA)-along with analysis of power-law beta slope (beta index) and standard deviation of N-N intervals (SDNN)-in edited and unedited (with ventricular premature beats - VPBs, only in DFA analysis) series of R-R intervals from Holter monitoring of healthy controls (Group 0, n = 27) and Chagas disease patients with left ventricular (LV) ejection fraction >50% (Group 1, n = 137) and with LV ejection fraction <50% (Group 2, n = 23). When analyzed from the edited R-R interval data, the long-term scaling exponent alpha(2) is altered both among the Chagas patients with and without LV dysfunction. The short-term scaling exponent alpha(1) was higher in Group 1 Chagas patients as compared to controls (P < 0.01) and did not differ between Group 2 and controls. In unedited R-R interval series, alpha(1) was significantly reduced in Group 2 Chagas patients (0.55 +/- 0.002) as compared to controls (0.90 +/- 0.002) and Group 1 (0.91 +/- 0.003) (P < 0.001), but did not differ between Group 1 and controls. Similarly alpha(2) was lower in Group 2 compared to other groups (P < 0.001). SDNN did not differ between the groups, but the beta index deriv...Continue Reading

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Citations

Nov 4, 2011·American Journal of Physiology. Regulatory, Integrative and Comparative Physiology·Siqi WangJoyce M Evans
Feb 13, 2008·Journal of Cardiovascular Electrophysiology·Antonio Luiz Pinho RibeiroManoel Otávio da Costa Rocha
Feb 1, 2011·Pacing and Clinical Electrophysiology : PACE·Mauricio LlagunoDalmo Correia Filho
Jan 18, 2011·Journal of Cardiovascular Electrophysiology·Antonio Luiz Pinho RibeiroFederico Lombardi
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May 3, 2008·Journal of Applied Physiology·Kevin S HeffernanBo Fernhall
Aug 1, 2019·Panminerva Medica·Spinello AntinoriMassimo Galli

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