Possibilities of detection of multiple conduction pathways by means of transesophageal cardiac pacing

Programmed transesophageal cardiac pacing revealed electrophysiological sig ns suggesting longitudinal dissociation of the atrioventricular (AV) node i nto multiple pathways in 7,7% of 147 patients with WPW syndrome and induced paroxysmal orthodromic AV reciprocating tachycardia. Electrophysiological mechanisms of participation of rapid and slow conduction pathways within AV node in initiation of orthodromic tachycardia were established. Variants o f participation of rapid and slow conduction pathways within AV node and of extranodal pathways in formation of orthodromic AV reciprocating tachycard ia were distinguished.