| Objective:To study the incidence rate and clinical significance of left iliac vein compression among asymtomatic patients by using multi-slice CT angiography.Methods:Two hundred and two cases without lower extremity diseases were evaluated with multi-slice helical abdominal CT angiography.Using multiplanar reformation technique,the anteroposterior diameter and area of bilateral iliac veins were mesured in orthogonal cross-sectional planes at the point where the right iliac artery crossed.The data were examined using spss software.Results:①In the orthogonal cross-sectional planes,the mean compression extent on anteroposterior diameter of left iliac veins was 27.06%±2.23%,on area of left common iliac veins was 9.59 %±1.63%.The mean compression extent on anteroposte rior diameter of left iliac veins exceeded the extent on area obviously(t=8.980,p=0.000).②Statistically, based on the area of the vein,the extent of less than 25% of compression on left iliac vein was found in 84.16%(n=170)of the patients,the extent of greater than 25 % and less than 50% was 11.88%(n=24),and 3.96%(n=8)of the patients revealed the extent of greater than 50 %,7 of which were female. The incidence of the extent of greater than 50% was higher in female than male(P =0.03). The total subjects were divided into three groups:A group were under 40-year-old,B group were between 40-year-old and 60-year-old,C group were over 60-year-old.Among 97 subjects who were female, there are no significant differences in the extent of compression on area within the three age groups (P A-B=0.249,P A-C=0.669,P B-C=0.293),neither were there among 105 subjects who were male(P A-B=0.401,P A-C=0.459,P B-C=0.841). In the total of 202 cases, there are no significant gender differences in the extent of compression on area(A group:t=0.492,P =0.627;B group:t=0.238,P =0.813;C group:t=1.597,P =0.113).③Measuring the anteroposterior diameter of iliac veins, the extent of less than 25% of compression on left iliac vein was found in 54.46%(n=110)of the patients,the extent between 25 % and 50% was 29.27%(n=59),and 16.34%(n=33)of the subjects exceed the extent of 50 %,22of which were female, The incidence of the extent of greater than 50% was higher in female than male(P =0.019). Among 97 subjects who were female, there are no significant differences in the extent of compression on anteroposterior diameter within the three age groups(P A-B=0.262,P A-C=0.086,P B-C=0.870),neither were there among 105 subjects who were male(P A-B=0.307,P A-C=0.156,P B-C=0.875).Within 202 cases, there are no significant gender differences in the compression extent of left iliac vein on area(A group:t=0.941,P =0.356;B group:t=1.437,P =0.156;C group:t=1.883,P =0.062).Conclusion : Based on the pelvic CT angiography,in asymptomatic individuals,left iliac vein compression has no statistically significant age or gender differences.However, there were more female who possessed the compression extent of left iliac vein exceeding 50% than male.The doctors should check in time for those patients especially female with symptoms of venous disease,to eliminate the occurrence of IVCS. |
PDF Full Text Request