Simulation study of ventricular rate control therapy during atrial fibrillation using one-dimensional cable model with two conduction pathways

recorder on the day of a marathon to look for ECG abnormalities that might be linked with sudden cardiac death. Methods: An ECG recording area was installed at the starting point of the Okinawa marathon, the Sapporo marathon and 5 other big rallies in total. Lead I of the ECG was recorded for 32 seconds using the CG2100 pocket sized ECG device in 2,596 runners (1,558 men and 1,038 women: 10–80 years old). An ECG specialist reviewed the ECGs at a later date and classified the ECGs according to the severity of the findings. Results: ECGs were classified from normal to abnormal (G0–G5) according to the severity of ECG findings, and as GN when noise prevented a diagnosis. The results were G0 2,224 (85.7%), G1 49 (1.9%), G2 113 (4.4%) and G3 7 (0.3%). None was classified as G4 or G5. However, 203 (7.7%) were classified as GN. Therefore, abnormal findings were present in 169/ 2596 people (6.6%) in this study. The abnormal findings included 16 SVPC, 33 VPC, 19 AF, 1 A-V Block, 7 negative T waves, 50 RBBB, 1 LBBB, 2 WPW syndrome and 9 ST-T abnormalities. Conclusion: The pocket size ECG recorder is useful for facilitating cardiac screening immediately before the beginning of a marathon.