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Figure 6 Atrial fibrillation increases the transverse conduction velocity in isolated rat atria. Original traces showing the stimulus and the response for transverse and longitudinal conduction are given. Ratios of the longitudinal and transverse conduction velocities (V_L/V_T) measured after 24 h in the bath (at the spontaneous beating rate) and after 24 h atrial fibrillation are given as mean ± SEM in the upper panel. The difference was significant (p < 0.05).