INCIDENCE OF MYOCARDITIS IN PATIENTS WITH DIABETIC ...
INCIDENCE OF MYOCARDITIS IN PATIENTS WITH DIABETIC CARDIOMYOPATHY
C. Chimenti, C. Centurion, P. Severino, R. Verardo, F. Toscano, F. Fedele
La Sapienza University, Rome, Italy
Objectives: To determine whether myocardial inflammation/infection can have a pathogenetic role in diabetic cardiomyopathy.
Background: Dilated cardiomyopathy in diabetics with normal coronaries and blood pressure is mainly ascribed to advance glycation of myocyte proteins and genes. However because of the associated cell-immunity abnormality, myocardial inflammation/infection can have a pathogenetic role and its recognition may affect disease prognosis and treatment.
Methods: Forty-three patients (13 F,30 M mean age 54.44±11.13 years) with diabetes (type 1:9 , type2:34; disease duration 9 ± 4.8 years ), normal coronary arteries and blood pressure underwent a left ventricular (LV) endomyocardial biopsy because of unexplained LV dilatation (end-diastolic diameter 63.8±7,3) and dysfunction (EF: 30,4±8,3%). Four to six biopsy samples each patient were drawn and processed for histology, immunohistochemistry and polimerase chain reaction (PCR) for the most common cardiotropic viruses.
Results: At histology hypertrophy with degenerative changes of cardiomyocytes and increased perivascular and replacement fibrosis was observed in 28 cases; in 15 pts (34%) lympho-mononuclear infiltrates (CD45RO+> 14/2mm) associated with focal necrosis of the adjacent myocytes meeting the Dallas criteria for myocarditis were shown (figure 1A). In 8 (55%) of them (3 with diabetes type 1 and 5 with type 2) a viral genome consisting in adenovirus (2, figure 1B) enterovirus (3) EBV (2), Influenza A virus (1) was detected at myocardial PCR.
Conclusions: Myocarditis and myocardial viral infection can be observed in up to 34% of patients with diabetic cardiomyopathy; their recognition suggests a potential role for anti-viral, immune-modulatory therapy
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