His Bundle Tachycardia, also known as junctional ectopic tachycardia, is related to tetralogy of fallot and atrioventricular block, and has symptoms including heart problem The drugs Magnesium sulfate and Dexmedetomidine have been mentioned in the context of this disorder. Affiliated tissues include atrioventricular node and heart, and related phenotypes are arrhythmia and junctional ectopic tachycardia