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Table 1 Calculated velocity of retrograde propagation (θr) as compared to that for antegrade propagation (θa) for cardiac muscle (CM) and smooth muscle (SM).

From: Propagated repolarization of simulated action potentials in cardiac muscle and smooth muscle

  

2-Cell Chain (Cardiac)

5-Cell Chain (cm/sec)

No. of GJ-Channels

Rgj (MΩ)

Threshold* (nA)

θr (cm/s)

CM

SM

θr

θa

θr

θa

0

#

#

##

32

##

3.7

1

10,000

#

#

##

38

##

6.8

10

1,000

95.4

7.1

##

55

##

13

100

100

15.8

30

50

115

73

42

1000

10

5.4

75

86

550

114

820

10,000

1

5.6

750

200

3000

400

3600

  1. * Pulse duration was held constant at 1.0 ms.
  2. # Second cell (A1) failed to repolarize.
  3. # # Some cells failed to repolarize.
  4. Velocities of antegrade propagation (θa) were taken from previously published data [17,18].