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Heart rate variability enhances the prognostic value of established parameters in patients with congestive heart

C Krüger1, T Lahm, C Zugck

  • 1Department of Cardiology, University of Heidelberg, Germany. carstenkrueger@web.de

Zeitschrift Fur Kardiologie
|December 20, 2002
PubMed

Insights

Heart rate variability (HRV) measured by Holter ECG offers significant prognostic value for congestive heart failure (CHF) patients. This assessment improves risk stratification beyond traditional LVEF and peak VO(2) measures.

Area of Science:

  • Cardiology
  • Medical Technology
  • Prognostics

Background:

  • Congestive heart failure (CHF) poses a significant mortality risk.
  • Established prognostic markers include left ventricular ejection fraction (LVEF) and peak oxygen uptake (peak VO(2)).
  • The prognostic utility of heart rate variability (HRV) in CHF patients requires further evaluation.

Purpose of the Study:

  • To assess the prognostic value of HRV in patients with CHF.
  • To determine if HRV provides additional predictive information beyond LVEF and peak VO(2).
  • To enhance risk stratification for cardiac mortality or CHF deterioration.

Main Methods:

  • Prospective study of 222 CHF patients with dilated or ischemic cardiomyopathy.
  • Holter ECG monitoring to assess HRV, specifically SDNN (standard deviation of all intervals between normal beats).
  • Follow-up for a mean of 15 months to record mortality and CHF hospitalizations.

Main Results:

  • Lower SDNN, LVEF, and peak VO(2) were observed in patients who died or were hospitalized for CHF.
  • SDNN was significantly lower in non-survivors/hospitalized patients (118+/-6 ms) compared to event-free patients (142+/-5 ms).
  • Multivariate analysis confirmed HRV provides independent and additional prognostic information for cardiac events.

Conclusions:

  • HRV determination enhances the prognostic power of LVEF and peak VO(2) in predicting CHF mortality or deterioration.
  • HRV assessment can improve risk stratification in patients with congestive heart failure.
  • Holter ECG-derived HRV is a valuable tool for CHF patient management.

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