Purpose: to study the effect of immunosupressive therapy (IST) in the virus-negative and virus-positive patients with immune-mediated myocarditis.
Methods: in 60 patients (45 male, 46.7 ± 11.8 years, mean LV EDD, 6.7 ± 0.7 cm, EF 26.2 ± 9.1%) active/borderline myocarditis was verified by endomyocardial biopsy (n = 38), intraoperative biopsy (n = 10), examination of explanted heart (n = 3) and autopsy (n = 9). Indications for IST determined based on histological, immune activity. The follow-up was 19.0 [7.25; 40.25] months.
Results: The viral genome in the myocardium was detected in 32 patients (V+ group), incl. parvovirus B19 in 23. The anti-heart antibody level was equally high in the V+ and V- patients. Antiviral therapy was administered in 24 patients. IST (in 22 V+ and 24 V- patients) include steroids (n = 40), hydroxychloroquine (n = 20), azathioprine (n = 21). The significant decrease of LV EDD (6.7 ± 0.7 to 6.4 ± 0.8), PAP (48.9 ± 15.5 to 39.4 ± 11.5 mm Hg, р<0,01), increase of EF (26.5 ± 0.9 to 36.0 ± 10.8), and lower lethality (23.9% and 64.3%; RR 0.37, 95% CI 0.19-0.71), p<0.01, were found only in IST group. Significant improvement due to IST were achieved not only in V-, but also in V+ patients.
Conclusions: IST in patients with immune-mediated lymphocytic myocarditis is effective and is associated with lower lethality both in virus-negative and virus-positive patients.
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