Comparative study of contrast medium injection schemes based on total body weight,lean body weight,and body surface area in coronary CT angiography of overweight patients
10.3969/j.issn.1002-1671.2024.06.028
- VernacularTitle:基于全体质量、去脂体质量和体表面积的对比剂注射方案在大体质量患者冠状动脉CT血管成像检查中的对比研究
- Author:
Jiani ZHAO
1
;
Jing LÜ
;
Yueying ZHANG
;
Lei ZHAO
;
Xinyu HAO
Author Information
1. 山西医科大学,山西 太原 030000
- Keywords:
coronary computed tomography angiography;
contrast medium;
total body weight;
lean body weight;
body surface area
- From:
Journal of Practical Radiology
2024;40(6):981-985
- CountryChina
- Language:Chinese
-
Abstract:
Objective To explore the application value of adjusting contrast medium dosage according to total body weight(TBW),lean body weight(LBW)and body surface area(BSA)in coronary computed tomography angiography(CCTA)of overweight patients.Methods A total of 150 patients with body mass index(BMI)≥24 kg/m2 undergoing CCTA examination were prospectively selected and randomly divided into TBW group,LBW group,and BSA group,with 50 patients in each group.All three groups used contrast medium iodixanol(320 mg I/mL)and the fixed injection time was 12 s.The dosage of contrast medium was 0.8 mL/kg(TBW);1.04 mL/kg(LBW)for male and 1.11 mL/kg(LBW)for female;BSA 30 mL/m2.The dosage and flow rate of contrast medium were compared among the three groups,the image quality was evaluated by subjective and objective ways,and the correlation between arterial enhancement and TBW,LBW and BSA were analyzed.Results According to a 5-point scale,the image quality of three groups met the clinical diagnostic requirements(both≥3 points).Compared with TBW group,the dosage of contrast medium in LBW group and BSA group decreased by 13.38％and 10.62％respectively,and the flow rate decreased by 13.41％and 10.61％respectively,and the differences were statistically significant(P＜0.05).The coronary CT values,signal-to-noise ratio(SNR)and contrast-to-noise ratio(CNR)in LBW and BSA groups were lower than those in TBW group(P＜0.05),and the variation range of CT values in LBW group were the smallest.There were no statistical differences in subjective scores of image quality among the three groups(P＞0.05).The coronary CT values were slightly correlated with TBW(r=0.342,P=0.015),and were not correlated with LBW or BSA(r=-0.207,P=0.150;r=-0.204,P=0.156).Conclusion LBW is the best body index to calculate the dosage of contrast medium for coronary artery enhancement in overweight patients.
