Mitral valve of rheumatism sex heart disease is narrow, left atrium expands, heart blood stream slow, be retarded by silt, make blood easily caky with thrombosis.

• 风湿性心脏病二尖瓣狭窄，左心房扩大，心脏血流缓慢、淤滞，易使血液凝固和血栓形成。