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Table 2 Summary of Total Propagation Time (TPT) and Velocity (θ) for Various combinations of longitudinal and transverse gap-junction channels in the 10 × 10 model for cardiac muscle.

From: Effect of transverse gap-junction channels on transverse propagation in an enlarged PSpice model of cardiac muscle

No. of channels TPT #Apparent Transv. velocity ##Overall velocity Sequence of firing (Percent in order)
Longit. Transv. (ms) (cm/sec) (cm/sec)  
0 0 17.5 0.82 84.9 23
0 10 17.6 0.82 84.4 13
0 100 17.8 0.81 83.4 13
0 1000 17.5 0.82 84.9 13
10 0 14.8 0.97 100 47
10 10 14.5 0.99 102 60
10 100 14.4 1.00 103 63
10 1000 14.4 1.00 103 63
100 0 16.3 0.88 91.1 100
100 10 12.1 1.19 123 100
100 100 8.7 1.66 171 100
100 1000 8.2 1.76 181 100
1000 0 16.8 0.86 88.4 100
1000 10 7.6 1.89 195 100
1000 100 3.0 4.80 495 100
1000 1000 1.9 7.58 782 100
  1. # Apparent transverse velocity was calculated from the TPT assuming a cell diameter of 16 μm.
  2. Velocity (θ) = (16 μm/junction) × (9 junctions transversely)/TPT
  3. ## Overall velocity was calculated from the TPT assuming a cell length of 150 μm.
  4. Velocity (θ) = (150 μm/junction) × (99 junctions)/TPT