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Figure 7 (Top) Percentage of local conduction delays (>8 ms/2.4 mm) and conduction block (>24 ms/2.4 mm) in the right atrial (RA) and left atrial (RA) walls of six control and seven atrioventricular (AV)-blocked goats. In dilated atria, conduction disturbances during atrial fibrillation were about twice as frequent as in non-dilated atria. (Bottom) The amount of intra-atrial conduction delay and block plotted against the mean atrial cell length in the control group (n = 6; filled circles) and in seven goats with chronic AV block (open circles). A moderate but statistically significant correlation was found between atrial cell size and intra-atrial conduction block (r = 0.60; p = 0.03).