The paroxysmal nature of the arrhythmia and a positive response to atropine and vagal maneuvers, as well as identification by electrophysiologic studies, differentiate this condition from inappropriate sinus tachycardia. (9)
Inappropriate sinus tachycardia. Diagnosis and treatment.
Treatment of postural orthostatic tachycardia syndrome and inappropriate sinus tachycardia. Curr Cardiol Rep.
Heart rate variability in inappropriate sinus tachycardia
. Am J Cardiol 1998; 82:531-534.
PNI in the context of RFCA has been reported in ablation of pulmonary veins (mostly right but also left) and ablation of superior vena cava (SVC)  and even in inappropriate sinus tachycardia
o- (3-piperidino-2-hydroxy-1-propoyl) nicotinic acid amide oxime active substance with the necessary official dossier for human clinical trial (inappropriate sinus tachycardia
Ivabradine is undoubtedly a promising attractive substitute for inappropriate sinus tachycardia
, stable angina, heart failure, and other cardiovascular diseases and it has beneficial implications for future clinical utilization4.