The effect of ultrasonic measuring error on the therapeutic radiation dose of atrial septal defect during interventional therapy / 实用放射学杂志

ABSTRACT

Objective To explore the effect of measure accuracy of crevasse diameter of atrial septal defect (ASD) by transthoracic echocardiography (TTE) on radiation dose during interventional therapy.Methods 79 cases ASD with interventional therapy in our hospital were analyzed retrospectively,according to the times which we chosen occluder device on the basis of defect diameter by TTE,we divided those cases into three groupsgroup A,the occluder device chosen well,and it took only one time to block success (50 cases);group B,it took two times to block success (22 cases);group C,because of the measurement error,it needed three times to block success (7 cases).Following data were separately recorded①measurement values of TTE,size of the occluder device and times of occluder device exchange;② radiation dose [cumulative radiation dose (AK,Gy),area dose product (DAP,Gy · cm2),fluoroscopic time (T,min)];③patient gender,age and body mass.Results All the cases were blocked success,the coincidence rate of TTE and occluder device were 62.67 ％,28 ％,9.33 ％,but there were significantly differences of AK,DAP and T in three groups (FAK=12.119,P=0.000;FDAp=8.241,P=0.001;FT =12.777,P=0.000).It showed that the radiation dose and T of group C were the largest and the longest,and group A were the least and the shortest,while the radiation dose and T of group B ranged between A and C groups.There was no statistically difference between radiation dose for different gender,age,body mass(P≥0.050).Conclusion The times of block and radiation dose is most influenced by the coincidence rate of TTE and occluder device.Increase of the coincidence rate may decrease the times of block and reduce the radiation dose for surgeon and patient.