Role of the cardiac gap junctions in impulse propagation – with special reference to the transitional region between different heart tissues (part 6)

Atrium preparation: Action potentials, the histogram and the CV recorded from two or three electrodes (A1, A2) placed at a distance of 300 |J.m within the atrial tissue are shown under control conditions in Figure 3a. Action potentials recorded from A1 (the key electrode) and A2 were well synchronized with each other. The interval histogram and the CV recorded from two positions (A1 and A2) were identical (Figure 3a). Ten minutes after application of 1.0 mM heptanol, the interval histogram and the CV recorded from A1 were not significantly changed, while those recorded from A2 were widely deviated and raised, even when conduction block was observed sometimes in a longer application of heptanol (Figure 3b).
Sinus node-atrium preparation: Action potentials, the histogram and the CV recorded from the sinus node and the atrium are shown under control conditions in Figure 4. Action potentials recorded from the sinus node and the atrium were well synchronized. The histogram and the CV recorded from the sinus node and the atrium were identical.

Role of the cardiac gap junctions in impulse propagation - with special reference to the transitional region between different heart tissues

Figure 3 Action potentials recorded simultaneously from the atrium (A1, A2) (left), and histogram and variation of action potential interval fright). A1 is recorded from the key electrode andA2 300 to 400fim away from A1. a control; b 10 mins after application of 1.0 mM heptanol. CV Coefficient ofvariation ofaction potential interval; R-R Action potential firing interval

Role of the cardiac gap junctions in impulse propagation - with special reference to the transitional region between different heart tissues

Figure 4 Action potentials recorded simultaneously from the sinus node (S) and from the atrium (A) from the sinus node-atrium preparation (left), and histogram and variation of action potential interval (right). S is recorded from the sinus node region and A in the atrial region 300 to 400 fim away from S. a control; b 5 mins after application of 0.5 mM heptanol. CV Coefficient ofvariation of action potential interval; R-R Action potential firing interval 
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