Please click here to obtain permission to reproduce this image.
Click on image to view larger version.
Figure 5 A different form of in vitro fibrillation during ACh infusion of a high concentration (5 µmol/l) (data from tissue no. 10). (A) A snapshot of dynamic display shows that there were multiple wave fronts (up to five) during fibrillation. All of these wave fronts activated rapidly and repetitively, as shown in the isochronal activation maps (B to D). These maps demonstrate the activation patterns of three consecutive beats in the white outlined area in part A. Each letter (a to c) in part A shows the recording site for a corresponding channel (Chn) in part E. Note that the activation patterns were similar among the maps in parts B to D. In addition, the activations in each channel of part E were relatively regular in rhythm and uniform in morphology. These findings indicate that these wave fronts were stationary in character. However, as shown in part E, the activation cycle lengths were different among these wave fronts. The simultaneous pseudo-electrocardiogram recording reveals "fibrillation-like" activity (F). The numbers in part B indicate the channel numbers. The numbers in parts C and D indicate the activation times. ACL = activation cycle length.
|
