Acute effects of caffeine ingestion on signal-averaged electrocardiograms

R. L. Donnerstein, D. Zhu, Ricardo A Samson, A. M. Bender, S. J. Goldberg

Research output: Contribution to journalArticle

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Abstract

Background: Although moderate caffeine ingestion has not been shown to be arrhythmogenic, caffeine toxicity can cause severe cardiac arrhythmias, including atrial fibrillation and ventricular tachycardia. Atrial fibrillation and ventricular tachycardia have been associated with prolongation of P-wave and QRS complex durations on signal-averaged electrocardiograms. This study investigated acute effects of caffeine ingestion on signal-averaged P-wave and QRS complexes. Methods and Results: Signal-averaged electrocardiograms were obtained from 12 normal subjects (6 men, 6 women; ages 21 to 26 years) before and after ingestion of caffeine (5 mg/kg body weight) or placebo in a randomized, double-blind, crossover fashion. Electrocardiograms for signal averaging were recorded from electrodes left in a constant location. After bandpass filtering (30 to 300 Hz) and amplification, signals were sampled over 7.2 minutes at 2000 Hz. Signal-averaged P-wave and QRS complex durations did not significantly change after placebo ingestion. After caffeine ingestion QRS duration prolonged in 9 of 11 subjects at 90 minutes (mean ± SEM = 0.8 ± 0.3 ms, P < .02) and in 8 of 9 after 3 hours (1.1 ± 0.2 ms, P < .001). No significant change in P- wave duration or heart rate was found after caffeine ingestion at any test interval. Average caffeine level in saliva 90 minutes after ingestion was 6.6 ± 1.6 (SD) μg/dL. Conclusions: Although probably not arrhythmogenic in normal subjects, moderate caffeine ingestion does produce a small but statistically significant prolongation of signal-averaged QRS complexes. Further prolongation caused by excessive caffeine intake may be a factor in the genesis of arrhythmias associated with caffeine toxicity.

Original languageEnglish (US)
Pages (from-to)643-646
Number of pages4
JournalAmerican Heart Journal
Volume136
Issue number4 I
DOIs
StatePublished - 1998

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Caffeine
Electrocardiography
Eating
Ventricular Tachycardia
Atrial Fibrillation
Cardiac Arrhythmias
Placebos
Saliva
Electrodes
Heart Rate
Body Weight

ASJC Scopus subject areas

  • Cardiology and Cardiovascular Medicine

Cite this

Acute effects of caffeine ingestion on signal-averaged electrocardiograms. / Donnerstein, R. L.; Zhu, D.; Samson, Ricardo A; Bender, A. M.; Goldberg, S. J.

In: American Heart Journal, Vol. 136, No. 4 I, 1998, p. 643-646.

Research output: Contribution to journalArticle

Donnerstein, R. L. ; Zhu, D. ; Samson, Ricardo A ; Bender, A. M. ; Goldberg, S. J. / Acute effects of caffeine ingestion on signal-averaged electrocardiograms. In: American Heart Journal. 1998 ; Vol. 136, No. 4 I. pp. 643-646.
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