Objective To explore the influence of renal insufficiency with microwave therapy in the treatment of liver cancer .Methods A retrospective clinical analysis with 80 patients who underwent microwave therapy of liver cancer ,was performed from June 2012 to March 2014 in the department of hepatobiliary and pan-creatic surgery ,the Affiliated Tumor Hospital of Harbin Medical University .According to perioperative presence of renal insufficiency,we divided the patients into renal dysfunction group (A)(n=44)and normal renal function group(B)(n=36);Preoperative ALT,TBIL,BUN,intraoperative hypotension,intraoperative urinary volume,age, the distance between the tumor and the main vessels in the liver ,postoperative microwave ablation time the differ-ences of the risk factors ,such as microwave ablation range and sex of the two groups were compared during micro -wave therapy .Results There was no statistical significant difference between the two groups on intraoperative u -rinary volume(P>0.05);The preoperative ALT,TBIL,BUN,intraoperative hypotension,age,microwave ablation time,the distance between the tumor and the main vessels in the liver ,scular microwave ablation range ,sex of two groups showed statistical differences (P<0.05).BUN with preoperative ALT,TBIL,preoperative BUN,intraoper-ative hypotension,age,the distance between the tumor and the main vessels in the liver ,time of microwave abla-tion,microwave ablation range,sex influence factors were positively correlated (r=0.63,0.60,0.58,0.49,0.45, 0.40,0.35,0.46,0.52,P<0.05).Strength and influencing factors of BUN are the distance between the tumor and the main vessels in the liver,microwave ablation range,intraoperative hypotension,preoperative ALT,sex,pre-operative TBIL,microwave ablation time,age,preoperative BUN(β=0.52,0.42,0.37,0.31,0.29,0.25,0.20, 0.18,0.16,P<0.05).Conclusion Microwave therapy leads to renal insufficiency in the treatment of liver cancer performs many aspects , including preoperative ALT , TBIL, preoperative preoperative BUN , intraoperative hypotension ,age,the distance between the tumor and the main vessels in the liver ,time of microwave ablation ,mi-crowave ablation range ,sex,which is closely related to the factors affecting the risk of kidney .

Objective To explore the effect of vascular stress changes on endothelial function recovery and vascular restenosis inhibition in dynamic degradation process of the degradable stent. Methods The material parameters of the hyper-elastic vascular constitutive relationship was fitted, and the stress distribution on the intima of the blood vessel before stent implantation and during dynamic degradation was calculated by numerical simulation. In vitro culture experiments were carried out, and the stretch ratios of the silicon chambers were 0%, 5%, 10% and 15%, respectively, to simulate the mechanical environment at different degradation stages, and to explore the effects of different stretch ratios on growth state of the endothelial cells （ECs）. Results After the stent was completely degraded, the circumferential intimal stress and strain of the vessel were restored to 0.137 MPa and 5.5%, which were close to the physiological parameters (0.122 MPa, 4.8%) before stent implantation. In vitro experiments showed that the survival rate of ECs was the highest under the condition of 0.1 MPa circumferential stress and 5% strain, and adhesion growth could be achieved. Conclusions With the occurrence of stent degradation process, the circumferential stress and strain of the intima were restored to a range close to physiological parameters, which promoted the growth of ECs. The recovery of intimal function could effectively inhibit the process of vascular restenosis. The results can provide the theoretical basis and experimental platform for studying coronary intervention for the treatment of vascular restenosis.