progressive operation

Conclusion DSAS is a progressive disease, Better knowledge of pathological anatomy, timing of surgery, the key to the operation is that left ventricular outflow tract should be thoroughly dredged, no injury should be made to the aortic valve, mitral valve and conduction bundle.

结论局限性主动脉瓣下狭窄是进展性的疾病，需掌握该病的病理解剖和手术适应症，手术关键是彻底解除狭窄，同时防止对主动脉瓣、二尖瓣及传导束的损伤。

Results The incidence rate of colonic ileus complicated with severe pancreatitis is 3.9%. Its location often occur to splenic flexure and transverse colon. Clinical symptom always appear in two or three months after non operation therapy and progressive aggravate.

结果本组重症急性胰腺炎并发结肠梗阻发生率为3.9%，其发生部位多位于结肠脾曲及横结肠，梗阻症状多在重症急性胰腺炎行非手术治疗后2～3个月内出现并进行性加重。

Use constructional type of progressive dies, change present one step operation of single die construction for two-step blanking, i. e, first step semi-blanking, second ejecting material.

用级进模结构形式，改现行简单模结构的一工步操作的冲裁为两工步操作：第一工步为半冲裁，第二工步为推料。