Signal intensity changes of dentate nucleus on plain MR T1WI innasopharyngeal carcinoma patients after radiotherapy andmultiple injections of gadolinium-base contrast agent

Objective To observe changes of plain MR T1WI signal intensity of dentate nucleus in nasopharyngeal carcinoma patients after radiotherapy and multiple times of intravenous injection of gadolinium-based contrast agent(GBCA).Methods Fifty patients with pathologically confirmed nasopharyngeal carcinoma and received intensity-modulated radiotherapy were retrospectively enrolled as the nasopharyngeal carcinoma group,and 50 patients with other malignant tumors and without history of brain radiotherapy were retrospectively enrolled as the control group.All patients received yearly GBCA enhanced MR examinations for the nasopharynx or the head.T1WI signal intensities of the dentate nucleus and the pons on same plane were measured based on images in the year of confirmed diagnosis(recorded as the first year)and in the second to the fifth years.T1WI signal intensity ratio of year i(ranging from 1 to 5)was calculated with values of dentate nucleus divided by values of the pons(ΔSI i),while the percentage of relative changes of year j(ranging from 2 to 5)was calculated withΔSI j compared toΔSI 1(Rchange j).The values of these two parameters were compared,and the correlation ofΔSI and GBCA injection year-time was evaluated within each group.Results No significant difference of gender,age norΔSI 1 was found between groups(all P>0.05).The second to the fifth yearΔSI and Rchange in nasopharyngeal carcinoma group were all higher than those in control group(all P<0.05).Within both groups,ΔSI was positively correlated with GBCA injection year-time(both P<0.05).Conclusion Patients with nasopharyngeal carcinoma who underwent radiotherapy and multiple times of intravenous injection of GBCA tended to be found with gradually worsening GBCA deposition in dentate nucleus,for which radiotherapy might be a risk factor.

Shellfish allergy and relation to iodinated contrast media: United Kingdom survey

AIM: To assess current practice of United Kingdom cardiologists with respect to patients with reported shellfish/iodine allergy, and in particular the use of iodinated contrast for elective coronary angiography.Moreover we have reviewed the current evidence-base and guidelines available in this area.METHODS: A questionnaire survey was send to 500senior United Kingdom cardiologists(almost 50% cardiologists registered with British Cardiovascular Society)using email and first 100 responses used to analyze practise. We involved cardiologists performing coronary angiograms routinely both at secondary and tertiary centres. Three specific questions relating to allergy were asked:(1) History of shellfish/iodine allergy in pre-angiography assessment;(2) Treatments offeredfor shellfish/iodine allergy individuals; and(3) Any specific treatment protocol for shellfish/iodine allergy cases. We aimed to establish routine practice in United Kingdom for patients undergoing elective coronary angiography. We also performed comprehensive PubMed search for the available evidence of relationship between shellfish/iodine allergy and contrast media.RESULTS: A total of 100 responses were received, representing 20% of all United Kingdom cardiologists. Ninety-three replies were received from consultant cardiologists, 4 from non-consultant grades and 3 from cardiology specialist nurses. Amongst the respondents, 66% routinely asked about a previous history of shellfish/iodine allergy. Fifty-six percent would pre-treat these patients with steroids and anti-histamines. The other 44% do nothing, or do nonspecific testing based on their personal experience as following:(1) Skin test with 1 mL of subcutaneous contrast before intravenous contrast;(2) Test dose 2 mL contrast before coronary injection;(3) Close observation for shellfish allergy patients; and(4) Minimal evidence that the steroid and anti-histamine regime is effective but it makes us feel better.CONCLUSION: There is no evidence that allergy to shellfish alters the risk of reaction to intravenous contrast more than any other allergy and asking about such allergies in pre-angiogram assessment will not provide any additional information except propagating the myth.

Studies on Hepatocyte-Targeting Magnetic Resonance Imaging Macromolecular Contrast Media

DTPA was covalently conjugated to the copolymer of L lysine and L tyrosine, then transchelated with Gd EDTA,the resultant polymer chelates were further reacted with 6 O bromoacetyl D galactose or methyl lactobionyloxyacetate to give PLT(Gd DTPA) with galactose moiety as liver targeting group.These macromolecular MRI contrast agents were characterized by means of FT IR, ICP AES, elementary analyses and UV Vis spectrophotometry. Their in vitro relaxivity and liver targeting property in mice were also investigated.

Transient small bowel angioedema due to intravenous iodinated contrast media

Three cases of transient proximal small bowel angioedema induced by intravenous administration of nonionic iodinated contrast media (CM) are presented.Computed tomography (CT) images in the venous phase displayed the proximal small bowel with circumferential thickening of the wall including the duodenum and proximal segment of the jejunum.The bowel wall was normal in non-enhanced images,and normal or inconspicuous in arterial phase enhanced images.In one of the three cases,the bowel wall was thickened in venous phase but disappeared in the 40 s delayed phase images.No filling defect was seen in the lumen of the superior mesenteric artery and vein.No peritoneal effusion or mesentery abnormality was found.Each of these patients reported only mild abdominal discomfort and recovered without specific treatment within a short time.Only one patient suffered mild diarrhea after scanning which had resolved by the following day.The transient anaphylactic small bowel angioedema due to intravenous iodinated contrast media was easily diagnosed based on its characteristic CT findings and clinical symptoms.Differential diagnosis may include inflammatory and ischemic bowel disease,as well as neoplasms.A three-phase CT protocol and good under-standing of this disorder are fundamentally important in the diagnosis of this condition.The supposed etiology behind the transient anaphylactic reaction to intravenous administration of iodinated CM in small bowel is similar to other CM-induced hypersensitive immediate reactions.The predilection location of transient anaphylactic bowel angioedema is the small intestine,particularly the proximal segment.A speculated cause may be the richer supply of vessels in the small intestine,ample mucous folds and loose connective tissue in the duodenum and the jejunum.

Protective Effect of Oral Steroid Premedication: Adverse Reactions to Nonionic Iodine Contrast Media for Computed Tomography

This study aimed to investigate the protective effect of oral steroid premedication in terms of adverse reactions to non-ionic contrast media. We investigated the incidence of adverse reactions among patients who underwent contrast-enhanced computed tomography. Patients in the premedication group took 30 mg of prednisolone orally the night before and on the morning of the scheduled computed tomography. Sixty-five patients received the same contrast media. Among them, 56 took prednisolone orally prior to the procedure (premedication without change of contrast media group) and nine without premedication (no premedication and no change of contrast media group). In total, 379 patients received different contrast media. Among them, 340 took prednisolone orally (premedication with change of contrast media group), while 39 did not take the premedication (no premedication with change of contrast media group). The adverse reaction rates in the premedication with change of contrast media and no premedication with change of contrast media groups were 1.8% (6/340 cases) and 2.6% (1/39 cases) (P = 0.54), respectively. The incidence of adverse reaction after the administration of non-ionic iodinated contrast media did not differ significantly based on whether an oral steroid was administered prior to compute tomography. Our evaluation is limited due to the small sample size of the contrast media-changed group. However, even if premedication with steroids is effective, it may only result in an adverse reaction reduction rate of ≤3%.

Effects of contrast media on the hepato-pancreato-biliary system

AIM:To determine the effects of high osmolarity contrast media (HOCM) and iso-osmolar contrast media (CM) application, with or without pressure, on hepato-pancreato-biliary (HPB) system.METHODS: Sixty rats were divided into six equal groups as follows: Group 1: (0.9% NaCl, control), Group 2: (diatrizoate meglumine Na, ionic HOCM, Urographin?), Group 3: (iodixanol, iso-osmolar non-ionic CM, Visipaque?); each of which was applied without pressure, whereas the animals of the remaining three groups (1p, 2p, 3p) were subjected to the same CM with pressure. We performed a duodenal puncture and introduced a catheter into the ampulla. After the catheterization, 0.2 mL CM or 0.9% NaCl was injected with or without pressure. Blood samples were taken for biochemical evaluations. The histopathological examinations of liver, common bile duct, and pancreas were performed.RESULTS: There were no significant differences between the six groups for blood amylase, alanine aminotransferases, aspartate aminotransferases, bilirubin levels (P>0.05). Alkaline phosphatase and γ glutamyl transaminase levels were higher (P < 0.05) in the Urographin? groups (2, 2p) than the Visipaque? groups (3, 3p), or control groups (1, 1p). Hepatocyte necrosis, portal area inflammation, and Kupffer's cell hyperplasia were higher (P<0.05) in the study groups than the control group. However, there were no significant differences (P>0.05) between HOCM (2,2p) and iso-osmolar CM (3,3p) groups. Bile duct proliferation and regeneration in the Urographin groups (2, 2p) were significantly higher (P<0.05) than the Visipaque groups (3, 3p) or the control groups (1,1p). Although CM caused minor damage to the pancreas, there were no statistically significant differences (P>0.05) between the groups. Application of the CM with pressure did not cause additional damage to the HPB system.CONCLUSION: Iso-osmolar, non-ionic CM could be more reliable than the ionic HOCM, whereas the application of pressure during the CM application had no effect on the HPB system.

Thyroid Dysfunction in Children Exposed to Iodinated Contrast Media:A Meta-Analysis and Systematic Review

Iodinated contrast media(ICM)has the potential to cause thyroid dysfunction in some patients.However,it is unclear whether this relationship exists in children.We conducted a systematic review and meta-analysis aim to obtain a general overview of the relationship between ICM exposure and the risk of thyroid dysfunction in children.Methods:Computer search of Web of Science,EMbase,PubMed,Cochrane Library,collection of relevant literature on ICM and thyroid dysfunction in children,the search period was from the establishment of the database to July 2021.Meta-analysis was performed using Stata 14.0 software.Results:A total of 8 literatures with 3497 children.The incidence of hypothyroidism in children with ICM exposure was 0.05(95%CI:0.05,0.12),P<0.0001.Subgroup analysis showed that the incidence of hypothyroidism in ICM exposed children in the European region was 0.21(95%CI:0.13,0.30),P<0.0001,a statistically significant difference.Conclusion:The current evidence shows that children exposed to ICM are at risk for hypothyroidism,with a higher risk in neonates,especially children with congenital heart disease.

术前Sonazoid超声造影评估肝细胞癌病理分化程度的价值

目的分析肝细胞癌(HCC)Sonazoid超声造影(CEUS)的特点与病理分化程度的相关性。方法纳入行CEUS检查并经病理确诊为HCC的患者64例,共64个病灶,根据病理分化程度将其分为高、中、低分化组,分别为6、48和10例。比较不同病理分化程度HCC的CEUS动脉期增强形态、增强水平和增强模式。结果动脉期增强形态分为均匀增强和不均匀增强2种,低分化组所有病灶及58.3%中分化组病灶呈不均匀高增强;高分化组病灶可呈均匀高增强、均匀等增强和不均匀高增强3种表现。动脉期,所有中、低分组病灶和66.7%高分化组病灶呈高增强,不同分化程度HCC的增强水平差异有统计学意义(P<0.01);门脉期,高、中、低分化组分别有16.7%、25.0%和70.0%的病灶消退成低增强,不同分化程度HCC的增强水平差异有统计学意义(P<0.05);延迟期,75%中分化组病灶和所有低分化组病灶呈低增强,66.7%高分化组病灶呈等增强,不同分化程度HCC的增强水平差异有统计学意义(P<0.01);Kupffer期,所有低分化组和95.8%中分化组病灶呈低增强,高分化组中仍有50%的病灶呈等增强,不同分化程度HCC的增强水平差异有统计学意义(P<0.01)。高分化组病灶表现为多种CEUS模式,中分化组病灶以“快进快退”、“快进慢退”为主,90.0%低分化组病灶呈“快进快退”模式,不同分化程度HCC的CEUS模式差异有统计学意义(P<0.01)。结论Sonazoid-CEUS在评估HCC病理分化程度方面具有一定价值。

利拉鲁肽对老年2型糖尿病患者经皮冠状动脉介入治疗后造影剂肾病及预后的影响

目的 探讨利拉鲁肽对老年2型糖尿病(T2DM)患者经皮冠状动脉介入治疗(PCI)术后造影剂肾病(CIN)及预后的影响。方法 回顾性分析2021年1月至2022年6月于天津市胸科医院心内科行PCI的老年T2DM患者364例,根据既往是否使用利拉鲁肽分为利拉鲁肽组145例和对照组219例。收集2组患者一般临床资料并使用倾向性评分匹配法校正混杂因素,倾向性评分匹配后,共纳入患者220例,每组110例。比较匹配后2组PCI术前及术后48 h血清肌酐(Scr)、尿素(BUN)、中性粒细胞明胶酶相关脂质运载蛋白(NGAL)、高敏C反应蛋白(hs-CRP)、丙二醛(MDA)、超氧化物歧化酶(SOD)、B淋巴细胞瘤-2相关X蛋白/B淋巴细胞瘤2基因比值、半胱氨酸天冬氨酸蛋白酶9及CIN发病率的差异,并在出院后随访18个月。采用多因素logistic回归分析利拉鲁肽对CIN发生的影响,采用Kaplan-Meier生存曲线分析和log rank检验比较2组主要不良心血管事件(MACE)发生的差异。结果 利拉鲁肽组术后48 h Scr、BUN、NGAL、hs-CRP、MDA水平显著低于对照组,SOD水平显著高于对照组(P<0.05,P<0.01)。利拉鲁肽组术后48 h CIN发病率显著低于对照组(7.27%vs 16.36%,P<0.05)。多因素logistic回归分析显示,利拉鲁肽是老年T2DM患者发生CIN的独立保护因素(OR=0.341,95%CI:0.128~0.906,P=0.031)。中位随访时间14.75(12.60,16.33)个月,利拉鲁肽组MACE发生率显著低于对照组(log rank χ^(2)=5.656,P=0.017)。结论 利拉鲁肽可以减少老年T2DM患者PCI术后CIN及MACE的发生,可能与其抗炎、抗氧化应激作用有关。

乌司他丁防治老年冠心病合并慢性肾脏病患者对比剂诱导的急性肾损伤的临床研究

目的探究乌司他丁对老年冠心病合并慢性肾脏病(CKD)患者发生对比剂诱导的急性肾损伤(CIAKI)的防治作用。方法连续入选2021年11月至2022年11月解放军总医院第一医学中心收治的老年冠心病合并CKD并拟行冠状动脉造影的患者321例,分为乌司他丁组161例,水化组160例。比较2组术前及术后2 d心、肾功能指标,观察2组心、肾功能变化差异及CIAKI发生情况。结果乌司他丁组术后2 d血清肌酐、尿素、胱抑素C、同型半胱氨酸、N末端B型钠尿肽前体水平显著低于水化组,估算肾小球滤过率水平显著高于水化组(P<0.01)。321例中有62例(19.3%)符合CIAKI诊断,乌司他丁组17例,水化组45例,乌司他丁组与水化组比较有显著差异(10.6%vs 28.1%,P<0.01)。乌司他丁组合并高血压、糖尿病、高脂血症及高尿酸血症的患者CIAKI发生率较水化组显著降低(P<0.01)。多因素logistic回归分析显示,乌司他丁是发生CIAKI的保护因素(OR=0.348,95%CI:0.180~0.673,P=0.001)。结论乌司他丁可改善老年冠心病合并CKD患者的肾功能,降低CIAKI发生风险。

超声造影诊断经皮肝穿刺胆管引流置管滑脱后胆瘘1例

患者女,69岁,胰头癌伴梗阻性黄疸,房间隔缺损、三尖瓣中度关闭不全,肺动脉高压;接受经皮肝穿刺胆管引流(percutaneous transhepatic cholangial drainage,PTCD)后置管滑脱伴轻微腹痛2天。查体:上腹部压痛阳性,无反跳痛及肌紧张,移动性浊音阴性。

超声造影成像对TI-RADS 4类甲状腺囊性皱缩结节诊断的临床应用

目的:探讨超声造影成像(CEUS)对TI-RADS 4类甲状腺囊性皱缩结节性质诊断效果.方法:选取2020年1月至2023年1月于本院就诊甲状腺结节患者中,被诊断为TI-RADS 4类甲状腺囊性皱缩结节的106例患者为研究对象,共112处病灶,纳入甲状腺囊性皱缩结节组(n=112).同期被同一家医院诊断的甲状腺乳头状癌(PTC)患者101例作为对照,共105处病灶,纳入PTC组(n=105).采取回顾性分析法比较两组病灶的超声表现及CEUS特点,分析CEUS特异性指标诊断甲状腺囊性皱缩结节的效能.结果:甲状腺囊性皱缩结节组与PTC组整体、壁增强模式的CEUS结果比较,差异有统计学意义(P<0.05);CEUS无增强模式诊断甲状腺囊性皱缩结节的灵敏度为95.11%,准确度为97.12%;壁增强模式诊断甲状腺囊性皱缩结节的灵敏度为55.26%,准确度为78.31%.结论:TI-RADS 4类甲状腺囊性皱缩结节超声表现与PTC存在一定相似度,但是CEUS鉴别诊断TI-RADS 4类甲状腺囊性皱缩结节可减少误诊,降低分类,避免不需要的手术和穿刺活检,值得临床广泛应用.

对比剂脑病中国专家共识2023

对比剂脑病(CIE)是血管内使用对比剂后发生的一种少见的神经系统并发症,因其临床表现缺乏特异性,易被忽视。近年来,随着不同学科介入诊疗技术的广泛开展,关于CIE的报道逐年增加。目前,国内外尚无关于CIE的统一诊疗规范。中国医师协会神经介入专业委员会组织有关专家讨论并共同撰写该共识,旨在为各级、各学科医师在预防、识别和处理CIE方面提供建议和参考。

分时段口服稀释碘剂后全腹部平扫及增强多层螺旋CT诊断急性胰腺炎继发胃肠瘘

目的评价分时段口服稀释碘剂后全腹部平扫及增强多层螺旋CT在诊断急性胰腺炎(AP)继发胃肠瘘(GIF)中的应用。资料与方法回顾性选取2017年1月—2022年12月湖南省人民医院连续收集的数据库中108例AP后期患者,记录其人口学信息和临床特征,行分时段口服稀释碘剂后全腹部平扫及增强多层螺旋CT筛查GIF,以此后5 d内的临床综合诊断结果作为参考标准,计算分时段口服稀释碘剂后全腹部平扫及增强多层螺旋CT诊断AP继发GIF的敏感度、特异度、阳性预测值、阴性预测值和准确度,评价两种方法诊断结果的一致性。结果分时段口服稀释碘剂后全腹部平扫及增强多层螺旋CT诊断AP继发GIF的敏感度为91.5%(95%CI 78.7%~97.2%),特异度为98.4%(95%CI 90.0%~99.9%),阳性预测值为97.7%(95%CI86.5%~99.9%),阴性预测值为93.8%(95%CI 84.0%~98.0%),准确度为95.4%(95%CI 91.4%~99.3%);两种方法的诊断结果一致性非常好,Kappa值为0.905;Mc Nemar’s检验P=0.375,提示两种方法诊断GIF及其亚组的结果差异均无统计学意义。结论分时段口服稀释碘剂后全腹部平扫及增强多层螺旋CT可简单、无创、快速、准确诊断AP继发GIF,为临床诊疗提供更早、更精确和更可靠的影像依据。

超声造影用于儿童泌尿生殖系统疾病的进展

超声造影(CEUS)无电离辐射、无肾毒性、安全性高,具有可动态实时成像等优势,适用于对儿童泌尿生殖系统病变进行观察及随访。经静脉CEUS显示微循环灌注能力好,可用于评估和随访肾脏局灶性病变、移植肾及肾外伤等;经尿道或经膀胱CEUS能较好地显示尿路形态,可用于检测先天性泌尿生殖系统异常。本研究围绕CEUS用于常见儿童泌尿生殖系统疾病的进展进行综述。

高帧率超声造影在肝局灶性病变中的诊断价值

目的探讨高帧率超声造影(H-CEUS)在肝脏局灶性病变(FLLs)定性诊断中的应用价值。资料与方法回顾性收集2021年8月—2022年8月四川省人民医院的72例FLLs。所有患者均先行常规超声发现病灶,后行超声造影(CEUS)及H-CEUS,对比两种方法显示的开始增强时间、增强方向、血管形态、峰值强度、增强均匀度等,评估CEUS、H-CEUS对FLLs的诊断价值。结果相较于CEUS,H-CEUS能够更清楚地显示FLLs动脉期增强方向、血管形态及增强后均匀度。CEUS、H-CEUS诊断FLLs的敏感度、特异度、准确度、阳性预测值、阴性预测值、曲线下面积分别为87.10%、96.77%,85.37%、87.80%,86.11%、91.67%,81.82%、85.71%,89.74%、97.30%,0.862、0.923。结论相较于CEUS,H-CEUS能够更清楚地显示病灶动脉期特征性表现,为FLLs的诊断提供了更丰富、可靠的信息,对FLLs具有较高的诊断效能。

超声造影评估2型糖尿病肾病肾脏血流灌注的价值

目的探讨超声造影定量评估肾脏血流灌注辅助诊断2型糖尿病肾病的应用价值。资料与方法前瞻性纳入2017年5月—2019年12月解放军总医院第一医学中心41例伴肾功能异常拟行肾脏穿刺的2型糖尿病患者,均行肾脏超声造影检查。比较糖尿病肾病和局灶节段性肾小球硬化症造影参数(肾皮质达峰时间、峰值强度、平均渡越时间、肾血流量曲线下面积)的差异,并分析造影参数与病理结果的相关性。结果41例患者中,病理诊断为糖尿病肾病30例,局灶节段性肾小球硬化症11例。糖尿病肾病组峰值强度和曲线下面积明显低于局灶节段性肾小球硬化症[峰值强度:3837.16(2449.16,5929.16)比8508.00(4334.88,21201.00),Z=-2.766,P=0.006;曲线下面积:0.14±0.05比0.19±0.05,t=-3.135,P=0.003]。糖尿病肾病组峰值强度与肾小球全球硬化率呈负相关(r=-0.489,P=0.006)。结论超声造影能够定量评估肾脏的血流灌注,对于辅助诊断2型糖尿病肾病具有一定临床价值。

基于钆塞酸二钠增强肝胆期MRI构建影像组学模型评估肝纤维化临床病理分期

目的 观察基于钆塞酸二钠(Gd-EOB-DTPA)增强肝胆期(HBP)MRI构建的影像组学模型评估肝纤维化(HF)临床病理分期的价值。方法 回顾性分析接受Gd-EOB-DTPA增强MR检查并经病理/临床评估HF临床病理分期的240例患者资料,测量HBP肝脏-肌肉信号强度比值(SIR1)及肝脏-脾脏信号强度比值(SIR2);提取并筛选HBP影像组学特征,构建影像组学模型;基于信号强度比值(SIR)及影像组学标签构建SIR-影像组学联合模型;以受试者工作特征(ROC)曲线分析各模型评估HF临床病理分期的效能。结果 SIR1与SIR2评估HF临床病理分期的曲线下面积(AUC)分别为0.63~0.70及0.65~0.71。评估HF、显著HF、进展期HF及早期肝硬化效能最高的影像组学模型分别为支持向量机(SVM)、SVM、轻量梯度提升机及K邻近法模型(验证集AUC分别为0.87、0.82、0.81及0.80)。SIR-影像组学联合模型评估验证集上述HF临床病理分期的AUC分别为0.88、0.82、0.82及0.81。结论 基于GdEOB-DTPA增强HBP MRI构建的影像组学模型有助于评估HF临床病理分期;联合HBP SIR可提高评估其效能。

分时相低对比剂注射方案在颅内动脉瘤三维-数字减影血管造影成像的应用

目的 探讨分时相低剂量低流率对比剂注射方案在颅内动脉瘤三维(three-dimensional,3D)-数字减影血管造影(digital subtraction angiography,DSA)成像的临床应用价值。方法 前瞻性连续收集经计算机断层扫描血管成像(CTA)/磁共振血管造影(MRA)检查疑似或确诊颅内动脉瘤患者共69例,按照交替序贯将患者分实验组35例,常规组34例,统计分析两组患者动脉瘤成像评分、旋转造影辐射剂量及栓塞效果。结果 实验组与常规组三维重建成像对颅内动脉瘤的细节显示比较,差异无统计学意义(P=0.633)。两组间患者辐射剂量空气比释动能(air kerma,AK)、剂量-面积乘积(dose-area product,DAP)比较,差异均无统计学意义(P=0.176,P=0.765)。两组患者间栓塞效果比较,差异无统计学意义(P=0.111)。实验组患者行3D-DSA使用对比剂剂量显著少于常规组,差异有统计学意义[(9.29±0.86)mL vs.(18.00±0.00)mL,P<0.01]。结论 分时相低对比剂注射方案在颅内动脉瘤患者3D-DSA成像安全有效,应用该方案能显著减少患者的对比剂使用剂量。

生理盐水清除导管间隙降低高压注射对比剂静脉空气栓塞发生率的效果研究

目的探讨用生理盐水清除高压注射器延长管和留置针导管间隙对高压注射对比剂静脉空气栓塞(VAE)发生率和发生情况的影响。方法纳入2021年6月至10月在我院放射科接受冠状动脉CT血管成像(CCTA)检查的169例门诊患者,随机分为干预组88例和对照组81例。干预组用生理盐水清除高压注射器延长管和留置针导管的间隙后连接,对照组用常规连接方法。由2位经验丰富的诊断医师在检查结束后,对重建后的CT图像中出现的气泡或者气-液平面进行评估,比较两组患者VAE发生率及发生情况。结果两组患者的性别、年龄、体质量、检查时心率、静脉留置针的部位、对比剂总量比较,差异无统计学意义(P>0.05);干预组和对照组VAE发生率分别为4.55%、14.81%,差异有统计学意义(P<0.05);两组VAE程度比较,差异无统计学意义(P>0.05);对照组检出37个空气栓子,干预组检出5个空气栓子,两组空气栓子的数量比较差异有统计学意义(P<0.05),两组空气栓子的直径、位置比较,差异无统计学意义(P>0.05)。结论用生理盐水清除高压注射器延长管和留置针导管的间隙减少了进入患者体内的空气体积,降低了VAE发生率,有利于提高高压注射对比剂的安全性。