Patient's age rather than severity of the arrhythmia influences the cost of medical treatment of atrioventricular nodal or atrioventricular reciprocating tachycardia. - Farkowski MM; Pytkowski M; Maciag A; Golicki D; Kowalik I; Czech M; Rucinski P; Szwed H (Journal of interventional cardiac electrophysiology : an international journal of arrhythmias and pacing, 2016)