Short-term variability of heart rate turbulence in chronic heart failure.

Journal Article

BACKGROUND: Heart rate turbulence (HRT) is associated with risk in chronic heart failure (CHF). The objective of this study was to assess the short-term variability of HRT and to compare the diagnostic yield of 7-day (7DH) versus 24-hour (1DH) Holter monitoring for calculating HRT in a CHF population. METHODS AND RESULTS: Forty-nine consecutive patients with CHF were studied. At inclusion, 7DH was performed to evaluate the variability of HRT parameters. For categorized analyses, turbulence onset (TO) ≥0% and turbulence slope (TS) ≤2.5 ms/RR were defined as abnormal, and patients were classified into subgroups based on the number of abnormal HRT parameters.The cumulative percentage of patients with calculable HRT increased from 69.4% with 1DH to 93.9% with 7DH. The intraclass correlation coefficients across the 7-day monitoring were 0.81 (95% confidence interval [CI] 0.70-0.89) for TO and 0.90 (95% CI 0.84-0.95) for TS. When comparing 2 randomly selected days, TO and TS values were similar (P > .1) and showed a strong correlation (TO: r = 0.79; TS: r = 0.84: P < .001). Bland-Altman plots showed a mean difference of 0.31% (95% CI -0.07 to 0.70) for TO and 0.44 ms/RR (95% CI -1.37 to 0.48) for TS. In contrast, categorized analyses showed that up to 16% of patients changed their HRT subgroup score from day 1 to day 2 of comparison. CONCLUSIONS: In this population, 7DH significantly increased the percentage of patients with calculable HRT parameters. The short-term variability of the quantitative HRT values was good, but when patients were categorized into the established HRT subgroups, the concordance was suboptimal.

Full Text

Duke Authors

Cited Authors

  • Manzano-Fernández, S; Pastor-Pérez, FJ; Barquero-Pérez, Ó; Pascual-Figal, DA; Goya-Esteban, R; Rojo-Álvarez, JL; Caamaño-Fernández, A; Martínez Martínez-Espejo, MD; Januzzi, JL; Valdés, M; García-Alberola, A

Published Date

  • September 2011

Published In

Volume / Issue

  • 17 / 9

Start / End Page

  • 735 - 741

PubMed ID

  • 21872143

Electronic International Standard Serial Number (EISSN)

  • 1532-8414

International Standard Serial Number (ISSN)

  • 1071-9164

Digital Object Identifier (DOI)

  • 10.1016/j.cardfail.2011.05.007

Language

  • eng