After treatment , the reduced Vp of vertebral artery was not improved apparently as compared with that before treatment in the control group , Vp in blood velocity abnormality ( including vascular spasm , stenosis or reduced velocity ) of vertebral artery and basilar artery was all improved as compared with that before treatment in the two groups ( P < 0.01 ) , and the improvements in the observation group were more obvious than those in the control group ( P < 0.01 ) .