Background

: rheumatic fever had a high incidence in developing countries. It is an inflammatory disease that affects the subcutaneous tissues, the central nervous system, the skin and the heart. The atrioventricular block second degree Mobitz type 1 as expression of rheumatic fever is unusual. Its diagnosis is a big challenge today.

Objective

: to present the case of a teenager with no previous history of cardiovascular manifestations of atrioventricular block second degree Mobitz type 1.

Case report:

17- years-old male patient, without background of recent tonsillitis, who received an electrocardiogram as part of the checking of hypertension diagnosed in 2016, where atrioventricular of second degree a blockage Mobitz type 1, without clinical manifestations neither increase of volume in the articulations, was diagnosed in Cardiology consult.

Conclusions:

an atrioventricular block Mobitz type 1 without clinical cardiovascular manifestations could be suspected in a subclinical carditis in pediatric patients. The treatment with specific antibiotics avoids the progression of the disease.

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