functional causes where there is no disease of the valve leaflets - right ventricular failure, right ventricular enlargement
rheumatic heart disease - rarely affects just the tricuspid valve. If it is due to rheumatic fever it usually occurs in association with mitral valve disease
infective endocarditis - right sided endocarditis in IV drug abusers
congenital e.g. Ebstein's anomaly
right ventricular papillary muscle infarction
trauma e.g. a blow on the sternum in a motor car accident
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