按体质量分组固定时长对比剂注射方案在CT冠状动脉成像中的应用

The application on CT coronary angiography with fixed contrast injection duration depented on body weight

目的探讨按体质量分组且固定对比剂注射持续时长方案在64排螺旋CT冠状动脉成像中的应用价值。方法将符合入组条件的103例CT冠脉成像患者按体质量分为4组,A组≤55 kg、B组56~70 kg、C组71~85 kg、D组〉85 kg。注射速率分别为4.0,4.5,5.0,5.5 mL/s,注射时长则固定为14 s,分别测量上腔静脉、升主根动脉部、左心室、右心室、右心房的CT值。结果 4组间上腔静脉、右心室和右心房的平均CT值差异无统计学意义（P〉0.05）;D组升主动脉根部平均CT值低于A组,D组左心室平均CT值略低于A、B组（P〈0.05）。结论在CT冠状动脉造影检查中,采用按体质量分组、固定对比剂注射持续时长方案临床应用简便,能达到一致的冠状动脉强化程度,提高冠状动脉成像质量。

Objective To explore the value of weight grouping fixed duration contrast injection protocols in 64-rows CT coronary angiography. Methods 103 avaible patients with suspected coronary＇ artery disease were divided into 4 groups according to body weight （A≤55 kg, B 56-70 kg, C 71-85 kg, D〉85 kg）. And the injection rates were 4.0, 4.5, 5.0, 5.5 mL/s respectively. Injection duration was fixed for 14 s. The CT values of superior vena cava, root of ascending aorta, left ventricle, right ventricle and right atrium were measured. Results There were no significant difference in the average CT value of superior vena cava, right ventricle and right atrium among the four groups （P〉0.05）. The average CT value of aortic root in group D was lower than that in group A. The average CT value of left ventricular in group D was slightly lower than that in group A and group B （P〈0.05）. Confusion The contrast injection protocols grouped according to body weight with fixed injection duration were avaible in clinical CT coronary angiography application. It could effectively achieve the same degree of coronary enhancement and improve the quality of coronary angiography.