[Lyme's disease, a possible cause of isolated acute myocarditis].

TL;DRAbstract

The frequency of cardiac lesion in patients with other signs of Lyme disease has been estimated at 8 percent. The usual manifestation of myocardial involvement is a varying degree of atrioventricular block or more diffuse signs of myocarditis. Autopsy or intramyocardial biopsy provides a histological diagnosis of myocarditis. Microscopy shows a diffuse lympho-plasmocytic infiltrate with presence of macrophages in the myocardium, associated with a varying number of necrotic myocytes. Structures resembling spirochetes have been found in some cases. Exceptionally, the cardiac lesion may be isolated, presenting as an acute atrioventricular block and/or an acute myocarditis; in such cases the diagnosis of cardiac lesion caused by Lyme disease is made on serological grounds. We report the case of a 30-year old man admitted for acute myocarditis which turned out to be totally regressive. Intramyocardial biopsy showed interstitial congestion associated with inflammatory lympho-histiocytic infi

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