[Paroxysmal tachycardia in children: analysis of two clinical cases].

Two cases of paroxysmal supraventricular tachycardia in children are reported. Associated congenital heart disease were excluded by color-doppler echocardiogram. Electrocardiogram, holter monitoring and transesophageal study (in one case) suggested associated Wolf-Parkinson-White syndrome. The former case was successfully treated with digitalis, the latter, diagnosed "at risk" by transesophageal recording, was long term treated with propafenone. Clinical evaluation at follow-up confirmed the efficacy of the therapy.