["Double nodal pathway" as a common electrogenic pathway at the base of first and second degree paroxysmal atrioventricular node and nodal reentrant tachycardia].
The combined occurrence of conduction disturbances and reentry in subjects with a dual atrioventricular nodal pathway is extremely rare and poorly documented, only by means of short electrocardiographic strips. This case report deals with a young woman with frequent episodes of paroxysmal first- and second-degree type I atrioventricular block due to a dual atrioventricular nodal pathway at Holter monitoring, and atrioventricular nodal reentrant tachycardia inducible at transesophageal electrophysiologic study. This case confirms that some paroxysmal first- and second-degree atrioventricular block and the atrioventricular nodal reentrant tachycardia may share the same electrogenetic substrate represented by a dual atrioventricular nodal pathway. This finding may be of clinical significance because of its potential therapeutical implications. Further studies are needed in order to explain the rarity of this association.
Tritto
M
M
Unità Operativa di Cardiologia, IRCCS, Istituto Oncologico, Bari.
Calabrese
P
P
D000328:Adult; D001283:Atrioventricular Node / Q000002:abnormalities* / Q000503:physiopathology; D004562:Electrocardiography; D005260:Female; D006327:Heart Block / Q000150:complications / Q000209:etiology*; D006801:Humans; D013611:Tachycardia, Atrioventricular Nodal Reentry / Q000150:complications / Q000209:etiology*