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Lyme carditis. Electrophysiologic and histopathologic study.

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To further define the nature of
Lyme carditis, electrophysiologic study and endomyocardial biopsy were performed in a patient with
Lyme disease, whose principal cardiac manifestation was high-degree atrioventricular block. Intracardiac recording demonstrated supra-Hisian block and complete absence of an escape mechanism. Gallium 67 scanning demonstrated myocardial uptake, and right ventricular endomyocardial biopsy revealed active lymphocytic myocarditis. A structure compatible with a spirochetal organism was demonstrated in one biopsy specimen. It is concluded that
Lyme disease can produce active myocarditis, as suggested by gallium 67 imaging and confirmed by endomyocardial biopsy. Furthermore, the presence of high-grade atrioventricular block in this
disease requires aggressive management with temporary pacemaker and corticosteroid therapy.

Am J Med. 1986 Nov;81(5):923-7. Case Reports

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