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Rate-dependent changes in atrial action potential duration after short- duration rapid atrial pacing in humans
Ichiro Watanabe1, Riko Masaki, Kimie Ohkubo
1Second Department of Medicine, Nihon University School of Medicine, Tokyo, Japan. iwatanab@med.nihon-u.ac.jp
Circulation Journal : Official Journal of the Japanese Circulation Society
|September 13, 2002
Abstract:
The effect of rapid atrial pacing on the rate adaptation of the atrial action potential duration was studied in humans. The right atrial monophasic action potential (RAMAP) of 5 patients was recorded before and after 30 min of rapid atrial pacing. The pacing cycle length (CL) was 146 +/- 9 ms, the shortest duration at which 1:1 capture was possible. The RAMAP duration at 90% repolarization (RMAPD) was measured. CL-dependent changes in RAMAPD (CL 600 ms-CL 300 ms) before and after rapid atrial pacing were 51.8 +/- 10.7 ms and 30.8 +/- 7.6 ms (p < 0.05), respectively.