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Circulation. 2003;107:565-570
Published online before print January 13, 2003, doi: 10.1161/01.CIR.0000047275.25795.17
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(Circulation. 2003;107:565.)
© 2003 American Heart Association, Inc.


Clinical Investigation and Reports

Short-Term Heart Rate Variability Strongly Predicts Sudden Cardiac Death in Chronic Heart Failure Patients

Maria Teresa La Rovere, MD; Gian Domenico Pinna, MS; Roberto Maestri, MS; Andrea Mortara, MD; Soccorso Capomolla, MD; Oreste Febo, MD; Roberto Ferrari, MD; Mariella Franchini, MD; Marco Gnemmi, MD; Cristina Opasich, MD; Pier Giorgio Riccardi, MD; Egidio Traversi, MD; Franco Cobelli, MD

From Divisione di Cardiologia e Bioingegneria (M.T.L.R., G.D.P., R.M., S.C., O.F., M.F., M.G., P.G.R., E.T., F.C.), Fondazione Salvatore Maugeri, IRCCS Istituto Scientifico di Montescano, Pavia, Italy; Dipartimento di Cardiologia (A.M.), Policlinico di Monza, Monza, Italy; Centro di Fisiopatologia Cardiovascolare (R.F.), Fondazione Salvatore Maugeri, IRCCS Istituto Scientifico di Gussago, Brescia, e Università di Ferrara, Italy; and Divisione di Cardiologia (C.O.), Fondazione Salvatore Maugeri, IRCCS Istituto Scientifico di Pavia, Italy.

Correspondence to Maria Teresa La Rovere, MD, Istituto Scientifico di Montescano, Fondazione Salvatore Maugeri, IRCCS, 27040 Montescano (PV), Italy. E-mail mtlarovere{at}fsm.it

Background— The predictive value of heart rate variability (HRV) in chronic heart failure (CHF) has never been tested in a comprehensive multivariate model using short-term laboratory recordings designed to avoid the confounding effects of respiration and behavioral factors.

Methods and Results— A multivariate survival model for the identification of sudden (presumably arrhythmic) death was developed with data from 202 consecutive patients referred between 1991 and 1995 with moderate to severe CHF (age 52±9 years, left ventricular ejection fraction 24±7%, New York Heart Association class 2.3±0.7; the derivation sample). Time- and frequency-domain HRV parameters obtained from an 8' recording of ECG at baseline and during controlled breathing (12 to 15 breaths/min) were challenged against clinical and functional parameters. This model was then validated in 242 consecutive patients referred between 1996 and 2001 (validation sample). In the derivation sample, sudden death was independently predicted by a model that included low-frequency power (LFP) of HRV during controlled breathing <=13 ms2 and left ventricular end-diastolic diameter >=77 mm (relative risk [RR] 3.7, 95% CI 1.5 to 9.3, and RR 2.6, 95% CI 1.0 to 6.3, respectively). The derivation model was also a significant predictor in the validation sample (P=0.04). In the validation sample, LFP <=11 ms2 during controlled breathing and >=83 ventricular premature contractions per hour on Holter monitoring were both independent predictors of sudden death (RR 3.0, 95% CI 1.2 to 7.6, and RR 3.7, 95% CI 1.5 to 9.0, respectively).

Conclusions— Reduced short-term LFP during controlled breathing is a powerful predictor of sudden death in patients with CHF that is independent of many other variables. These results refine the identification of patients who may benefit from prophylactic implantation of a cardiac defibrillator.


Key Words: heart failure • prognosis • nervous system, autonomic • respiration • death, sudden


Related Article:

Predicting Sudden Death Risk for Heart Failure Patients in the Implantable Cardioverter-Defibrillator Age
William G. Stevenson and Laurence M. Epstein
Circulation 2003 107: 514-516. [Extract] [Full Text]



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