Objective To explore the effect of competitive respiratory training in patients undergoing abdominal contrast-enhanced magnetic resonance imaging(MRI).Methods A total of 115 patients who un-derwent abdominal contrast-enhanced MRI in the hospital from October 2021 to April 2022 were randomly as-signed to the control group(n=64)and the experimental group(n=51).The control group received routine one-on-one respiratory training,while the experimental group received a competitive respiratory training,wherein the first of the two individuals to achieve qualified breath-holding would undergo scanning first.The duration of respiratory training and scanning,as well as abdominal MRI image quality,were compared between the two groups.Image quality was assessed based on respiratory motion artifact scores,anatomical detail scores,and the percentage of sequences affected by respiratory motion artifacts.Results The average duration of respiratory training in the experimental group was significantly shorter than that in the control group[(39.90±14.26)s vs.(71.31±20.96)s,P=0.001].The difference in total scan time of the abdomen and up-per abdomen was not statistically significant(P＞0.05).The respiratory motion artifact score was higher in the experimental group compared to the control group(P＜0.05).The anatomical detail scores for both the FIESTA and LAVA sequences were higher in the experimental group than in the control group(P＜0.05),while no significant difference was found for the T1 sequence score(P＜0.05).The percentage of sequences affected by respiratory motion artifacts was significantly lower in the experimental group than in the control group(P=0.006).Conclusion Competitive respiratory training can shorten the duration of respiratory train-ing,improve breath-hold quality and persistence,reduce respiratory motion artifacts,and consequently enhance image quality in abdominal contrast-enhanced MRI.

Objective To establish the analytical performance specifications(APS)for routine items of biochemical inspection based on the external quality assessment(EQA)and internal quality control(IQC)data.Methods The EQA data and IQC data of routine items of biochemistry inspection in clinical laboratory center of national health commission from 2021 to 2023 were collected from the Department Clinical Laboratory of Traditional Chinese Medicine Hospital of Chengdu Pidu District.Comparing the percentage difference of the EQA data and the IQC in control imprecision[expressed as the coefficient of variation(CV)]data with the 3-level evaluation criteria derived based on biological variation(BV),the percentage pass rate of EQA data and the pass rate of CV under control were calculated,so as to achieve the quality target of APS with 80％or more as the quality control product of this level as the routine biochemical test items of the laboratory.For the inspection items that did not reach BV standard APS or were not applicable to meet the standard,the APS would be set to the WS/T 403-2012 industry standard or based on current technical level.Results TEa/allowable CV of biochemical inspection items were as follows:Potassium(K)2.4％/1.9％,Sodium(Na)4.0％/0.9％,Chloride(Cl)4.0％/0.9％,Calcium(Ca)3.4％/1.8％,Phosphate(P)9.6％/1.9％,Magnesium(Mg)3.8％/2.0％,Glucose(Glu)6.1％/2.3％,Creatinine(Crea)3.9％/2.2％,Urea(Urea)8.6％/3.3％,Total protein(TP)4.9％/2.0％,Albumin(Alb)3.3％/1.9％,Total bilirubin(TBil)6.3％/2.4％,Alanine transaminase(ALT)9.3％/2.9％,Asparpartate transaminase(AST)6.2％/2.1％,γ-glutamyl transferase activity(GGT)9.2％/2.1％,Lactate dehydrogenase(LDH)6.8％/2.2％,Alkaline phosphatase(ALP)7.2％/3.3％,Total cholesterol(TC)of 8.3％/2.6％,Triglyceride(TG)12.9％/4.9％,Amylase(AMY)5.9％/1.6％,Creatine kinase(CK)4.3％/1.6％and Uric acid(UA)2.9％/1.0％.Conclusion The APS set based on BV or current technical level can be used as a quality target for routine laboratory clinical biochemistry testing programs,and the laboratory can select the suitable APS according to the actual situation.