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Viruses in May Viral Cardiomyopathy

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Viruses in May Viral Cardiomyopathy VIRUSES IN MAY Patrick Groenestein VIRAL CARDIOMYOPATHY Myocarditis Myyyocarditis is an inflammatory condition of myocardial muscle cells with diverse causes. Myocarditis Wide ranggpe of clinical presentation from mild dyspnoea to cardiovascular collapse and death. Myocarditis Historically, myocarditis referred to any non-valvular heart disease, but now used for inflammatory causes not associated with infarction, injury, or congggenital genetic abnormalities. Myocarditis: non -viral causes Bacterial à C. diphtheriae, mycobacteria, gonococcus, salmonella, H. influenzae, … SiSpiroc hae tes Fungal à Asperg illus, mucormycoses, can dida Parasitic à AiAscaris, TiTric hine lla sp ira lis, Taen ia spp. Rickettsial Myocarditis: non -viral causes Immune mediated à Allergens Drugs: actazolamide, penicillins, cefachlor, thiazides… à Allo-antigens Heart transplant (rejection) à Auto-antigens Scleroderma, SLE, Chagas’ disease, Churg- Strauss, thyro toxi cos is Myocarditis: non -viral causes Toxic à Drugs Anthracyclines, catecholamines, lithium, cocaine à Heavy metals à Electric shock, hyperpyrexia, radiation à Stings & bites à Others Arsenic, p hosp h or us, CO, Viral Myocarditis Commonest known cause à Most myocarditis is not identified in the community à CfttblihdCause often never established. à Epidemiology: Sudden death in the young: ~20% attributed to myocarditis on autopsy evidence. Prospective / retrospective autopsy rates of 1-9% Dallas criteria established 1986 Dallas criteria: normal Feldman AM, McNamara D. Myocarditis NEJM 2000: 343 (19); 1388: Dallas criteria: borderline myocarditis X 100 X 350 Feldman AM, McNamara D. Myocarditis NEJM 2000: 343 (19); 1388: Dallas criteria: active myocarditis X 300 X 100 Feldman AM, McNamara D. Myocarditis NEJM 2000: 343 (19); 1388: Dallas criteria Onlyyy 10% of those clinically considered to have myocarditis were positive on Dallas criteria Myocarditis is often regional, so biopsies can miss the active areas of inflammation HIV Higgypph numbers of asymptomatic persons with HIV have evidence of dilated cardiomyopathy Pro-viral DNA not routinely found in myocytes, and o ther v iruses (CMV, EBV HCV) are also present. à Unclear whether HIV or its immune suppression are responsible Dilated cardiomyopathy Normal parasternal long axis QuickTime™ and a decompressor are needed to see this picture. Dilated cardiomyopathy QuickTime™ and a decompressor are needed to see this picture. Dilated cardiomyopathy QuickTime™ and a decompressor are needed to see this picture. Apical 4-chamber Normal A4C QuickTime™ and a decompressor are needed to see this picture. Dilated cardiomyopathy QuickTime™ and a decompressor are needed to see this picture. MRI QuickTime™ and a decompressor are needed to see this picture. MRI MRI MRI MRI MRI: myocarditis QuickTime™ and a decom pr essor are needed to see this picture. MRI: normal myocardium QuickTime™ and a decompressor are neede d to see this p ic ture. MRI: normal myocardium QuickTime™ and a decompressor are needed to see this picture. MRI: normal myocardium Acute and chronic disease Fulminant myocarditis, and acute myocarditis can be any degree of severity, but fully recover. Long term, chronic deterioration with dila te d car diomyopa thy assoc ia te d w ith ongoing viral infection or immune activation Acute and chronic disease Acute and chronic disease Cooper L. Myocarditis NEJM 2009: 360 1526 Acute and chronic disease Cooper L. Myocarditis NEJM 2009: 360 1526 Conclusion Viral myocarditis is more common than clinical data suggests, as causative agents diagnosed in a minority of cases Sequelae range from none to death, through dilated cardiomyopathy, arrhythmia, fibrosis, ongoing viraemia. Treatments are supportive, although the immune suppressants may have a role in selected subpppopulations. Even those infections for whichg specific treatments exist, improved cardiac outcomes have not been shown..
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