Electrocardiographic analysis in a patient with dual atrioventricular
nodal non-re-entrant tachycardia
Abstract
1:2 atrioventricular (AV) conduction is characterized by one atrial
activation antegrade conduction down fast and slow pathways, which
results in two ventricular activations. This phenomenon also referred to
as a “double fire”. When this phenomenon repeats rapidity, dual
atrioventricular node non-re-entrant tachycardia (DAVNNT) occurs. We
report the case of irregular QRS complexes tachycardia with a
comprehensive record of this phenomenon including, routine
electrocardiogram, Holter recordings, and intracardiac
electrophysiological study (EPS). In conclusion, through analysis of the
ECG and intracardiac recording during tachycardia, we presume that the
most likely electrophysiological explanation of our case is the “double
ventricular response to a single sinus beat”.