Abstract
Although uncommonly encountered, dual atrioventricular nodal
non-reentrant tachycardia (DAVNNRT) is a well described arrhythmia that
can manifest in patients with dual atrioventricular nodal pathways
physiology. This arrhythmia is characterized on ECG by a single P wave
followed by two conducted QRS complexes, and on intracardiac EGMs by a
single atrial electrogram followed by two separate His deflections and
ventricular electrograms. Our case demonstrates a rare case of “triple
atrioventricular non-reentrant tachycardia” in which a patient was
found to have 3 distinct AV nodal pathways and multiple “triple fire
responses”, both on surface ECG and intracardiac electrograms.