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 groups:group 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 recorded:①measurement 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.
ABSTRACT
Objective To investigate radiation dose diffent type of anesthesia affected radiation dose when we do interventional therapy for child patent ductus arteriosus (PDA).Methods From 201 1 to 2014,we collected 50 children(3-6 years old)with PDA which received interventional therapy were included in the study.They were divided into two groups:group A (25 cases,male/fe-male=7/18,mean weight=1 5.32 kg±2.41 5 kg)underwent interventional therapy of PDA under general anesthesia,and group B (25 cases,male/female=13/12,mean weight=1 6.40 kg±2.056 kg)using local anesthesia.The surgery were operated by the same doctor,we used DSA children cardiovascular film AE mode (ped CARD)to monitor the surgery,image frames 1 5-30 f/s,used the non-ionic contrast agent (Iodixanol 320 mg I/mL)and recorded the child cumulative incidence of skin surface dose (AK),dose area product(DAP),and time of fluoroscopy,and do statistical analysis.Results All 50 cases were performed the surgery successfully. There were no significant difference of age,weight and gender between groups (age:t=1.924,P =0.06;weight:t =1.703,P =0.095;gender:χ2 =3.00,P =0.083).The cumulative incidence of skin surface dose (AK),dose area product (DAP)and time of fluoroscopy were (0.061±0.025)Gy,(5.08±2.19)Gy·cm2 and (3.15±1.16)min in A group,and (0.094±0.046)Gy,(8.41±3.587)Gy·cm2 , (6.86±3.27)min in B group.The sequence and image number of two groups were same.There were significantly differences of cumulative incidence of skin surface dose (AK),dose area product (DAP)and time of fluoroscopy between two groups (AK:t =3.152,P =0.003;DAP:t =3.957,P =0.000;time of fluoroscopy:t =5.346,P =0.000).The radiation doses of A group significantly lower than B group,compared with B group,the radiation dose were 40 percent [(1-5.08/8.41)%]lower in A group,the 1.1 7 times discrepancy of time of fluoroscopy between two group [(3.1 5-6.86)/3.1 5].Conclusion Radiation dose is associated with type of anesthesia. Compared with local anesthesia,radiation dose reduced 40% using general anesthesia during interventional therapy for PDA.
ABSTRACT
Objective To explore the clinical application value of MRA (TOF and PC)in cerebrovacular arteriovenous malforma-tion imaging when DAS as a reference gold standard.Methods 60 patients clinically suspected cerebral vascular malformations were enrolled in our study.They were all underwent MRA (TOF and PC)and DSA examinations successively within three days.Then, the imaging of feeding arteries,vascular malformation masses and venous drainages were compared and analyzed.Results Of all 60 patients with AVM,their feeding arteries and arterioles images were showed better by DSA and MRA-TOF technology than by MRA-PC.The difference was statistically significant (χ2/P DSA?PC - 4.1 75/0.000,χ2/P TOF ?PC - 3.508/0.000 ),no statistically difference was found between DSA and MRA-TOF findings,(χ2/P DSA?TOF -0.740/0.459).However,their venous drainages and venules show better with DSA and MRA-PC technology than with MRA-TOF method,the difference was statistically significant (χ2/P DSA?TOF -2.445/0.014,χ2/P PC?TOF -3.443/0.001),no statistically difference was found between DSA and MRA-PC findings (χ2/P DSA?PC -1.085/0.278).Conclusion MRA-TOF to display cerebral arteries and MRA-PC to show cerebral venues are basically consistent with the DSA,MRA-TOF and MRA-PC cannot replace each other when showing cerebral arteries and venous.