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Impulse propagation in the ventricle depends on both sodium channel availability and cell-to-cell coupling through gap junctions. Sodium channel block has been shown to depress conduction velocity (theta) more longitudinal (LONG) to than transverse (TRANS) to fiber orientation. Because exposure to CO2 produces intracellular acidosis and decreased gap junction conductance in vitro, we tested the hypothesis that increased PCO2 would result in preferential depression of transverse conduction in vivo.

Effect of hypercapnic acidemia on anisotropic propagation in the canine ventricle.