Quantitative Analysis of Termination of Vagally Induced Canine Atrial Fibrillation by Mutual Information

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概要

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• Atrial fibrillation (AF) is often described as a disorganized phenomenon, but many features that qualitatively suggest an underlying order have recently been reported. The present study aimed to disclose this underlying order of AF in a quantitative manner, using a new method of mutual information (MI), which is a measure for gauging the general correlation between 2 time series. Frequency analysis and the MI method were used to analyze 5 epicardial potentials on both atria during AF induced by vagal stimulation (Vs) in 15 dogs. Unipolar electrodes were placed on the right atrial appendage (Rap), the high right atrium (HRA), and the left atrial appendage (Lap). The other 2 electrodes were placed equidistantly between HRA and Rap (RA1-RA2). The power spectrum of AF had a discrete peak around 17 Hz during Vs. After Vs was stopped, the discrete peak shifted from 17Hz to 7Hz on all epicardial leads. Taking RA2 as a reference, MI was calculated between RA2 and each of the other electrodes. The MI values (0.066±0.005) were greater than 0.047 (the critical value for correlated data) even during Vs. The MI values increased significantly from the highly active process of AF during Vs to the less active one (0.126±0.006) before termination of AF. In addition, the MI values increased more at the electrodes close to RA2 (RA1 and Rap) than at those far from it (HRA and Lap). These findings suggest that multiple wavelets, which are not random, progressively organize into a few major waves toward the termination of AF; therefore, AF is not a random phenomenon in this model.

• 日本医科大学の論文
• 2001-03-25

著者

• Saitoh Hirokazu

  Nippon Medical School First Department Of Internal Medicine

• Takano Teruo

  First Department of Internal Medicine, Nippon Medical School

• Saitoh Hirokazu

  First Department of Internal Medicine, Nipponn Medical School Hospital

• Atarashi Hirotsugu

  First Department of Internal Medicine, Nippon Medical School

• Osaka Motohisa

  The First Department Of Internal Medicine Nippon Medical School

• Takano Teruo

  First Department Of Internal Medicine Nippon Medical School

• Atarashi Hirotsugu

  First Department Of Internal Medicine Nippon Medical School

• Osaka Motohisa

  Department Of Internal Medicine Nippon Medical School Second Hospital

• Ohsaka Motohisa

  Department Of Life Information Sciences Institute Of Gerontology Nippon Medical School

• Saitoh Hirokazu

  First Department Of Internal Medicine Nippon Medical School

• Atarashi Hirotsugu

  The First Department Of Internal Medicine Nippon Medical

• Atarashi Hirotsugu

  Department Of Internal Medicine And Cardiology Nippon Medical School Tama-nagayama Hospital

• Shimizu Shuichi

  First Department of Internal Medicine, Nippon Medical School

• Osaka Motohisa

  Institute of Gerontology and Center of Information Sciences, Nippon Medical School

• Shimizu Shuichi

  First Department Of Internal Medicine Nippon Medical School

• Saitoh Hirokazu

  The First Department Of Nippon Medical School

• Saito Hirokazu

  The First Department Of Internal Medicine Nippon Medical School

• Saito Hirokazu

  1st Department Of Internal Medicine Nippon Medical School Tokyo

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