title: Atrioventricular nodal reentrant tachycardia with retrograde block induced by aprindine.
abstract: Two patients are described who had atrioventricular nodal reentrant tachycardia (AVNRT) with 1:1 relationship in the control state, but in whom a varying degree of VA block during AVNRT was observed during therapy with aprindine. Aprindine, however, did not cause anterograde blockade of conduction over the slow AV nodal pathway during tachycardia. These observations support the conclusion that the bulk of atrial muscle is not a requisite part of the tachycardia circuit in AVNRT and that antiarrhythmic drugs may have disparate effects on conduction in the retrograde and anterograde limbs of the circuit.
authors.affiliation: Sohka City General Hospital, Clinical Electrophysiology Laboratory, Saitama, Japan.
authors.forename: K
authors.initials: K
authors.lastname: Okishige
authors.forename: K
authors.initials: K
authors.lastname: Hirao
authors.forename: F
authors.initials: F
authors.lastname: Suzuki
authors.forename: H
authors.initials: H
authors.lastname: Suzuki
authors.forename: K
authors.initials: K
authors.lastname: Hiejima
authors.forename: P J
authors.initials: PJ
authors.lastname: Wang
authors.forename: P L
authors.initials: PL
authors.lastname: Friedman
mesh_terms: D000328:Adult; D000368:Aged; D001073:Aprindine / Q000627:therapeutic use*; D001283:Atrioventricular Node / Q000187:drug effects / Q000503:physiopathology*; D002304:Cardiac Pacing, Artificial; D004562:Electrocardiography; D005260:Female; D006327:Heart Block / Q000139:chemically induced*; D006801:Humans; D013611:Tachycardia, Atrioventricular Nodal Reentry / Q000175:diagnosis / Q000188:drug therapy* / Q000503:physiopathology
chemical_list: D001073:Aprindine