RADIOFREQUENCY TREATMENT OF A PERMANENT TACHYCARDIA BY RECIPROCATING RHYTHM

Permanent tachycardia by reciprocating rhythm is an arrhythmia due to macro-reentry using the normal conduction pathways in anterograde dire ction and an accessory atrioventricular pathway, most often posterosep tal, in retrograde direction. It is sometimes worrying because of its chronicity and the deterioration in left ventricular function with whi ch it may be associated. A case is reported of permanent tachycardia b y reciprocating rhythm treated by radiofrequency. The diagnostic value , already shown by other authors, of stimulation of the upper part of the interventricular septum to confirm the participation of an accesso ry atrioventricular pathway in the tachycardia circuit is mentioned, a nd the need for extensive mapping, because of the recent description o f non-postero-septal accessory pathways, is stressed.