[Sick sinus syndrome in childhood. A case report (author's transl)].

The case of an eight-year old child suffering from sick sinus syndrome (SSS) is reported. The patient showed S-A conduction disturbances (Mobitz 1 sinoatrial exit block) as noted in two sequential 24-hour recording periods, and a pathologic response to atropine test. An involvement of the A-V node was also present, made clear by a first and a second degree Mobitz 1 block. The clinical, laboratory and noninvasive data excluded an organic cardiopathy. Idiopathic SSS was, therefore, diagnosed. The rare occurrence of this syndrome in the childhood, and the usefulness of Holter monitoring in its detection is emphasized.