Atrial ectopic tachycardia (TAE) is secondary to an ectopic focus with high automatism. In pediatric pathology it is, as frequency, the third supraventricular tachycardia. The purpose of this study is the evaluation of the clinical, therapeutical and evolutional details of TAE to the child. Methodology: a retrospective study was done upon the cases with kids suffering of TAE, admitted in the Pediatric Cardiology Clinic Tg Mures, between 1999-2005. It was pursuit: hospitalization reasons, aspect of ECG, antiarrhythmic treatment given, immediate evolution and during the time. Results: it was studied a lot of 10 children with TAE, aged between 2 days and 14 years. Secondary cardiomiopathy was noticed for 4 cases. Antiarrhythmic treatment was done with the following drugs, alone or in combination: digoxin, betablockers, propafenone, sotalol, amiodarone. In all cases tachycardia was controlled by the drug administered, and in 3 cases full resolution was gained. Conclusion: secondary cardiomiopahty has a high frequency; with the III-rd class anti arrhythmics the best results were obtained; spontaneous resolution of the tachycardia is possible.