Table 2.

Indications and results of EPS.

Arrhythmia/symptoms (number of patients)	EPS/ablation successful (number of patients)	EPS/ablation not successful (number of patients)	Reason/comment (number of patients)
Atrial flutter (n = 14)	12	2	Successful ablation in 12 patients. Placement of catheter not successful (n = 1), third degree heart block (n = 1).
Atrial tachycardia (n = 11)	2	9	Successful ablation in 2 patients. Multifocal tachycardia and ablation are not feasible (n = 4), placement of catheter is not successful (n = 3), no entrainment (n = 1), origin at atrial septum without is ablation procedure (n = 1).
Atrial fibrillation	1 (AV-node ablation)	—	Successful ablation in 1 patient.
Incisional reentry tachycardia (n = 2)	2	—	Successful ablation in 2 patients.
AVNRT (n = 4)	4	—	Successful ablation in 4 patients.
Nonsustained VT (n = 15)	15	—	No induction of VT.
Monomorphic premature ventricular beats (n = 3)	3	1	Successful ablation in 2 patients (right ventricle outflow tract). In 1 patient multiple foci (origin in left and right heart), ablation is not feasible.
Slow VT (n = 2)	2	—	Successful ablation in 2 patients.
Syncope (n = 3)	3	—	Diagnosis of bradyarrhythmia (n = 2), no reason detectable (n = 1).

EPS: electrophysiological study, VT: ventricular tachycardia, and AVNRT: atrioventricular nodal reentrant tachycardia.