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(Circulation. 2000;102:300.)
© 2000 American Heart Association, Inc.

Clinical Investigation and Reports

Reduced Ventricular Response Irregularity Is Associated With Increased Mortality in Patients With Chronic Atrial Fibrillation

Akira Yamada, MD; Junichiro Hayano, MD; Seiichiro Sakata, MD; Akiyoshi Okada, MD; Seiji Mukai, MD; Nobuyuki Ohte, MD; Genjiro Kimura, MD

From the Third Department of Internal Medicine, Nagoya City University Medical School, Nagoya, Japan.

Correspondence to Akira Yamada, MD, Third Department of Internal Medicine, Nagoya City University Medical School, 1 Kawasumi Mizuho-cho Mizuho-ku, Nagoya 467-8601, Japan. E-mail a.yamada{at}med.nagoya-cu.ac.jp

Background—Variations in the ventricular response interval (VRI) during atrial fibrillation (AF) may be reduced in patients with adverse clinical outcomes. The properties of VRI dynamics associated with prognosis remain undetermined.

Methods and Results—In 107 patients with chronic AF (age, 64±9 years), we analyzed a 24-hour ambulatory ECG for VRI variability (SD, SD of successive differences, and SD of 5-minute averages) and VRI irregularity (Shannon entropy of histogram, symbolic dynamics, and approximate entropy of beat-to-beat and minute-to-minute fluctuations [ApEn_b-b and ApEn_m-m]). During a follow-up period of 33±16 months, 18 patients died (17%), 9 from cardiac causes, 7 from fatal strokes, and 2 from malignancies. Reductions in all VRI variability and irregularity measures were associated with an increased risk for cardiac death but not for fatal stroke. A significant association with cardiac death was also found for ejection fraction (relative risk, 1.10; 95% confidence interval [CI], 1.04 to 1.17, per 1% decrement) and ischemic AF (relative risk, 6.52; 95% CI, 1.62 to 26.3). After adjustment for these clinical variables, all irregularity measures except symbolic dynamics had predictive value (relative risks [95% CIs] per 1SD decrement: Shannon entropy of histogram, 2.03 [1.14 to 3.61]; ApEn_b-b, 1.72 [1.14 to 2.60]; and ApEn_m-m, 1.90 [1.03 to 3.52]); however, the predictive power of variability measures was no longer significant. When the patients were stratified with the 33rd and 67th percentile values of ApEn_b-b (1.83 and 1.94, respectively), the 5-year cardiac mortality rates for the upper, middle, and lower tertiles were 0%, 13%, and 43%, respectively (log-rank test, P=0.04).

Conclusions—Reduced VRI irregularity in a 24-hour ambulatory ECG has an independent prognostic value for cardiac mortality during long-term follow-up in patients with chronic AF.

Key Words: atrial fibrillation • entropy • heart rate • mortality • nonlinear dynamics

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