title: Clinical and electrophysiological observations with disopyramide in drug-resistant and recurrent symptomatic arrhythmias.
abstract: Seventeen patients with recurrent symptomatic arrhythmias were treated with oral disopyramide (DP). Fifteen of the 17 patients had received other currently conventional anti-arrhythmic therapy, to which only 1 patient responded, yet 13 of these 15 patients with resistant arrhythmias responded to DP. Electrophysiological studies were performed on 9 patients. The most impressive electrophysiological findings were the depressant effect of DP on ventricular automaticity and its action in slowing conduction through the His-Purkinje system (including the bundle branches) without depressing sino-atrial rate and atrioventricular (AV) nodal conduction time. Retrograde ventriculo-atrial (VA) conduction was markedly prolonged in 4 patients with reciprocating supraventricular tachycardia (SVT), including 2 patients with Wolff-Parkinson-White syndrome. All 4 patients with reciprocating SVT appear to be cured of their arrhythmia, probably by this mechanism.
mesh_terms: D000328:Adult; D000368:Aged; D001145:Arrhythmias, Cardiac / Q000188:drug therapy*; D003864:Depression, Chemical; D004206:Disopyramide / Q000494:pharmacology / Q000627:therapeutic use*; D004351:Drug Resistance; D004594:Electrophysiology / Q000379:methods; D005260:Female; D006321:Heart / Q000503:physiopathology; D006339:Heart Rate / Q000187:drug effects; D006801:Humans; D008297:Male; D008875:Middle Aged; D011725:Pyridines / Q000627:therapeutic use*; D013575:Syncope / Q000188:drug therapy
chemical_list: D011725:Pyridines; D004206:Disopyramide