生理盐水冲洗对 MDCT 腹主动脉和肾动脉增强效果的影响

摘要

Objective:To evaluate the enhancement effect of abdominal aorta and renal artery in MDCT angiography (CTA)with different normal saline (NS)flushing rate.Methods:63 patients with renal artery CTA were randomly divided into Group A,B,C.CTA was performed after 4 mL/s injection of 60mL iohexol (350mg I/mL),then 50mL NS was injected with the flushing rate as 3.0mL/s,5.0mL/s and 7.0mL/s in Group A,B,C respectively.The CT values of distal and proxi-mal segment of bilateral renal arteries and abdominal aorta were measured.The enhancement degree of abdominal aorta and bilateral renal artery between different NS flushing rate were compared with single factor analysis.Results:The CT values of proximal and distal right renal artery,abdominal aorta,proximal and distal left renal artery in the three NS flushing rate groups had significant statistic differences (F =21.1,P <0.01;F =24.6,P <0.01;F =26.6,P <0.01;F =20.2,P <0.01;F =16.2,P <0.01 respectively).The CT values of different segments in Group A showed significant difference when com-pared with that of Group B and C (P <0.01),while there was no statistical difference between Group B and Group C (P >0.05).Conclusion:5mL/s flushing rate with 50mL NS could achieve the maximum CT enhancement value of renal artery af-ter injection of 60mL contrast agent in CTA.%目的：评价不同生理盐水冲洗流率对 MDCT 腹主动脉和肾动脉增强效果的影响。方法：63例行肾动脉MDCT 增强扫描的患者随机分为 A、B、C 组。A、B、C 组均以4 mL／s 注射60 mL 碘海醇（350 mg I／mL）后，分别以3．0、5．0及7．0 mL／s 的流率注射50 mL 生理盐水。测量各组双侧肾动脉的远段、近段和腹主动脉的 CT 值。不同生理盐水冲洗流率组间腹主动脉及双侧肾动脉强化程度的差异采用单因素方差分析。结果：不同生理盐水冲洗流率组间右肾动脉远段、右肾动脉近段、腹主动脉、左肾动脉近段及左肾动脉远段的平均 CT 值差异有统计学意义（F ＝21．1，P ＜0．01；F ＝24．6，P ＜0．01；F ＝26．6，P ＜0．01；F ＝20．2，P ＜0．01；F ＝16．2，P ＜0．01）。A 组各部位 CT 值与 B 组及 C 组差异均有统计学意义（P ＜0．01）。C 组各部位 CT 值与 B 组间差异无统计学意义（P ＞0．05）。结论：肾动脉 MDCT 增强扫描注射60 mL对比剂后行50 mL 生理盐水冲洗时，采用5 mL／s 的冲洗流率，可以实现肾动脉的最大 CT 增强值。