摘要:
Objective To observe the effect of stenting on the intravascular pressure gradient in patients with stenosis of subclavian artery and vertebral arteries origins.Methods The distal arterial pressure(Pd and Pd')and the proximal arterial pressure(Pa and Pa')of stenotic proximal and posterior stenosis were measured in 20 patients with subclavian or vertebral artery origin stenosis before and after stent implantation, and the pressure gradient was recorded and calculated.Both arms systolic pressurewas measured in patients with subclavian artery stenosis.Results Compared with preoperation, the stenosis rate of postoperation was significantly decreased(Z =-3.921, P<0.001),and Pa'-Pd' was significantly lower than Pa-Pd(Z=-3.922, P<0.001).Vertebral artery stenosis group and subclavian artery stenosis group stenosis rates of preoperation were decreased significantly those in postoperation(Z=-2.938, P=0.003; Z=-2.677, P=0.007), Pa'-Pd'in the two groups were significantly lower than Pa-Pd(Z=-2.201, P=0.028; Z=-2.366, P=0.018).There was a positive correlation between vascular stenosis rates of preoperation and Pa-Pd in vertebral artery stenosis group and subclavian artery stenosis group (r=0.937, P<0.001; r=0.760, P=0.018).The preoperative vascular stenosis rate inall the patients was positively correlated with Pa-Pd(r=0.771,P<0.001).There was statistically significant in the systolic pressure difference of two arms in subclavian artery stenosis patient between before and after operation(Z=-2.670, P=0.008).There was no correlation between the preoperative stenosis rate and the systolic pressure gradient(r=0.185,P=0.634).Conclusions The stenosis rates of subclavian artery and vertebral arteries origins are correlated with intravascular pressure gradient.The stenting can decrease the intravascular pressure gradient.%目的 探讨支架置入术对锁骨下动脉及椎动脉起始部狭窄患者狭窄两端血管内压力差的影响.方法 检测20例锁骨下动脉或椎动脉起始部狭窄患者支架置入术前后的狭窄远端平均动脉压(Pd、Pd')及狭窄近端平均动脉压(Pa、Pa'),记录并计算压力差.测量锁骨下动脉狭窄患者的双臂收缩压.结果与术前比较,患者术后血管狭窄率显著降低(Z=-3.921,P<0.001),Pa'-Pd'显著低于Pa-Pd(Z=-3.922, P<0.001).术后椎动脉狭窄组及锁骨下动脉狭窄组狭窄率较术前显著降低(Z=-2.938,P=0.003;Z=-2.677,P=0.007),Pa'-Pd'显著低于Pa-Pd(Z=-2.201,P=0.028;Z=-2.366,P=0.018).椎动脉狭窄组及锁骨下动脉狭窄组术前血管狭窄率与Pa-Pd呈正相关(r=0.937,P<0.001;r=0.760,P=0.018).入组者术前血管狭窄率与Pa-Pd呈正相关(r=0.771,P<0.001).锁骨下动脉狭窄患者手术前后两臂收缩压差值有统计学意义(Z=-2.670,P=0.008).锁骨下动脉狭窄患者术前狭窄率与两臂收缩压差值无相关性(r=0.185,P=0.634).结论 锁骨下动脉及椎动脉起始部的狭窄率与血管内压力差存在相关性,支架置入术可以改善该处狭窄近远端的血管内压力差.