[Effect of adenosine triphosphoric acid (ATP) on accessory conduction bundles].

The effects of an injection of 40 mg of ATP were studied in 48 subjects with an overt or latent preexcitation syndrome. The results showed that the slowing of anterograde or retrograde conduction by ATP was not specific for nodal conduction. This phenomenon was observed in conduction through Kent bundles with long refractory periods and the possibility of preexcitation due to the association of James and Mahaim fibres should also be considered.