Transient complete atrioventricular block in Lyme disease

Cardiac manifestation in Lyme disease are uncommon and could generate myoca rditis and/or pericarditis, but the most frequent and typical cardiac manif estation is in the form of conduction system disorders, causing blocks, whi ch according to their location and degree, could be intraventricular, intra atrial or atrioventricular of first, second or third degree. We report a ca se of transient atrioventricular block in a patient with frequent tick bite s and with a positive serologic test for Borrelia burgdorferi.