If it's a simple... if it's a simple thing like what's the differential for aortic stenosis, i. e. injection systolic murmur, there's just four points here.

如果这是一个简单的......如果这是一个简单的内容，比如主动脉狭窄的鉴别诊断，即注射收缩期杂音，这里只有四个要点。

Other conditions that cause audible systolic murmurs include ventricular septal defect and mitral valve prolapse.

产生可闻及的收缩期杂音的其他情况包括室间隔缺损和二尖瓣脱垂。

Examples of conditions associated with common systolic murmurs include: mitral valve regurgitation, when the mitral valve does not close properly and blood surges back to the left atrium during systole.

二尖瓣反流，当二尖瓣关闭不全时，血液在收缩期反流至左心房。