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多层螺旋CT口服小肠造影(MSCTE)对克罗恩病的诊断价值
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摘要
背景:
     克罗恩病(Crohn's Disease, CD)属于炎症性肠病(Inflammatory Bowel Disease, IBD)的一种,是病因不明的胃肠道慢性炎性肉芽肿性疾病,呈节段或跳跃式分布,从口腔至肛门各段消化道均可受累,病变多见于末段回肠和邻近右侧结肠。治疗CD的药物选择需基于病变范围、病变程度、患者对治疗的反应以及不同个体的情况而定,不同部位不同活动程度的CD在药物选择上有很大差别,明确疾病累及部位以及活动程度对治疗CD有重要指导意义。目前有多种临床方法协助诊断CD及其病变程度、范围和评估有无其他并发症等,如结肠镜、小肠镜、消化道钡餐造影,各自存在其优缺点及局限性,随着影像学技术的发展,多层螺旋CT口服小肠造影(Multi-slice Computer Tomography Enterography, MSCTE)作为新的非侵入性诊断CD工具逐渐广泛应用于临床,但目前对其诊断价值尚未有统一的定论。
     目的:
     探讨MSCTE对诊断CD病变范围的敏感度及特异度;探讨MSCTE表现与CD患者C-反应蛋白(C-Reactive Protein, CRP)及红细胞沉降率(Erythrocyte Sedimentation Rate, ESR)的关联性;探讨MSCTE表现与CD患者临床疾病活动度的关联性;探讨MSCTE与小肠镜的联系。
     方法:
     (1)选取2010.6-2012.2在我院消化科临床上拟诊或确诊为CD并行MSCTE患者共50例入选A组,收集患者相关病史、辅助检查结果,计算Harvey-Bradshaw指数(Harvey-Bradshaw Index, HBI)并得出患者疾病活动等级,应用SPSS15.0软件计算患者MSCTE对于探查结直肠病变的准确性和可靠性;计算患者各MSCTE表现(包括肠系膜血管改变、肠壁增厚、肠壁粘膜强化、淋巴结增大、肠腔狭窄或扩张、瘘道形成)与CRP、ESR及患者疾病活动等级的相关系数R及其假设检验。
     (2)选取2009.4-2012.2在我院行MSCTE检查并在MSCTE检查前后1月内行小肠镜的患者(包括门诊患者及住院患者)共81例入选B组,收集患者病史资料、辅助检查结果,分析统计患者就诊原因、MSCTE影像学诊断及小肠镜诊断,应用SPSS15.0软件计算患者MSCTE探查肠道炎性病变的准确性及可靠性,计算其中诊断为CD患者各MSCTE表现所占的比例。
     结果:
     A组:(1)50例患者中5例单独累及结直肠(10.0%),19例单独累及小肠(38.0%),22例同时累及结直肠、小肠(44.0%),1例仅累及胃窦区(2.0%),3例未有异常发现(6.0%)。MSCTE对于探查结直肠病变的敏感度为12/15(80.0%),特异度为4/7(57.1%),假阴性率为3/15(20.0%),假阳性率为3/7(42.9%),约登指数为0.371,粗一致率为72.7%。Kappa值为0.371(P>0.05);(2)50例患者中有14例显示肠系膜血管改变,43例显示有肠段肠壁增厚(超过4mm),39例显示有肠壁粘膜强化,29例显示肠系膜根部淋巴结增大,25例显示肠腔狭窄或扩张,3例发现瘘道形成;(3)CRP可能与MSCTE表现中淋巴结增大以及肠腔狭窄或扩张相关(R>0.2,P>0.05),ESR可能与MSCTE表现中肠系膜血管改变、淋巴结增大相关(R>0.2,P>0.05);(4)患者疾病活动等级可能与MSCTE表现中肠系膜血管改变相关(R>0.2,P>0.05)。
     B组:(1)81例患者就诊原因中消化道出血及腹痛原因待查所占比例最高,分别为30.9%及25.9%,MSCTE诊断为炎性病变者比例最高,为46.9%,肠道占位或肿瘤次之,为23.5%,小肠镜诊断为炎性病变比例最高,为51.9%,肠道肿瘤次之,为19.8%;(2)MSCTE对探查肠道炎性病变的敏感度为30/42(71.4%),特异度为31/39(79.5%),假阴性率为12/42(28.6%),假阳性率为8/39(20.5%),约登指数为0.509,粗一致率为75.3%,Kappa值为0.507(P>0.05);(3)MSCTE显示存在炎性病变患者最后诊断为CD者为57.9%,对于显示炎性病变累及小肠患者最后诊断为CD占62.9%;(4)B组患者中最后诊断为CD者共29例,这些患者MSCTE表现中肠壁增厚及肠壁粘膜强化所占比例最高,分别为79.3%及72.4%,肠系膜血管改变占13.8%,不存在瘘道形成的病例。
     结论:
     (1)CD大多累及小肠,亦可累及结直肠,MSCTE在反映小肠病变方面有其优越性,亦能在一定程度上反映结直肠病变。(2)MSCTE能在一定程度上反映CD的疾病活动程度,但不能完全替代内镜检查,可作为CD患者长期随访的工具。(3)MSCTE中显示存在炎性病变特别是累及小肠时需首先考虑CD。(4)MSCTE与CRP及ESR之间的相关性仍缺乏统一的说法,将来需进行更多前瞻性研究及大样本研究以明确。
Background:
     Crohn's disease (CD) is a chronic inflammatory granulomatous disease with unknown etiology. It can affect any portion of the gastrointestinal tract, such as the esophagus, stomach, duodenum, the small bowel, colon, while the terminal ileum and proximal colon are most commonly affected. The treatment of CD depends on not only the extent and the severity of the disease, but also patient's responsiveness to previous treatments and the condition of individual patient. So it is important to identify the affected portion and evaluate the activity of CD. So far lots of diagnostic tools can help to diagnose CD such as ileocolonoscopy, barium enema examination, double balloon enteroscopy (DBE). They have their own advantages and disadvantages. Nowadays multi-slice computer tomography enterography (MSCTE) becomes the common non-invasive diagnostic tool. However its diagnostic value is still controversial.
     Aim:
     To explore the sensitivity and specificity of the MSCTE in diagnosing the extent of CD, the relationship between MSCTE and CRP/ESR of CD patients, the relationship between MSCTE and the activity of CD, and the relationship between MSCTE and DBE.
     Methods:
     50patients with known or suspected CD undergoing MSCTE in Zhongshan Hospital from June2010to February2012were chosen as group A. Clinical data included history, physical exam, laboratory tests, colonoscopy and MSCTE findings (abnormal mucosal vascularity, bowel wall thickening, mucosal enhancement, intestinal stenosis or distension, lymph node enlargement, fistula formation) were collected. We analyzed the accuracy and reliability of MSCTE in detecting colorectal lesions. SPSS15.0was used for the statistical analysis of the correlation between MSCTE findings and CRP/ESR in CD and the correlation between MSCTE findings and the activity of CD.
     81patients undergoing MSCTE and DBE in Zhongshan Hospital from April2009to February2012were chosen as group B. Clinical data included history, MSCTE findings and DBE findings were collected. We analyzed the accuracy and reliability of MSCTE in detecting inflammatory lesions. SPSS15.0was used for the statistical analysis of the MSCTE findings and DBE findings in CD patients.
     Results:
     Group A:(1) MSCTE findings showed5patients (5/50) were affected only in colorectum,19patients (19/50) were affected only in small intestine,22patients (22/50) were affected both in colorectum and small intestine, and one patient (1/50) was affected in gastric antrum. The sensitivity of MSCTE in detecting colorectal lesions in CD was12/15, while the specificity was4/7. Kappa value was0.371(P>0.05).(2)MSCTE findings showed14patients (14/50) were with abnormal mucosal vascularity,43patients (43/50) were with bowel wall thickening (above4millimeter),39patients (39/50) were with mucosal enhancement,29patients (29/50) were with lymph node enlargement,25patients (25/50) were with intestinal stenosis or distension and3patients (3/50) were with fistula formation.(3)CRP may be correlated with lymph node enlargement and intestinal stenosis or distension (R>0.2, P>0.05). ESR may be correlated with abnormal mucosal vascularity and lymph node enlargement (R>0.2, P>0.05).(4) The activity of CD may be correlated with abnormal mucosal vascularity (R>0.2, P>0.05).
     Group B:(1)30.9percent of the patients were suspected intestinal hemorrhage and25.9percent were with abdominal pain.46.9percent of the patients showed inflammatory lesions and23.5percent showed intestinal tumor in their MSCTE findings.51.9percent of the patients showed inflammatory lesions and19.8percent showed intestinal tumor in their DBE findings.(2) The sensitivity of MSCTE in detecting inflammatory lesions was30/42, while the specificity was31/39. Kappa value was0.507(P>0.05).(3)22patients (22/38) who showed inflammatory lesions in MSCTE findings were ultimately diagnosed with CD.(4)29patients were ultimately diagnosed with CD in group B. MSCTE findings showed4patients (4/29) were with abnormal mucosal vascularity,23patients (23/29) were with bowel wall thickening,21patients (21/29) were with mucosal enhancement,11patients (11/29) were with lymph node enlargement and14patients (14/29) were with intestinal stenosis or distension.
     Conclusions:
     CD most commonly affects colorectum and small intestine. MSCTE examination has excellent potential to discover small intestinal and colorectal lesions. MSCTE findings can help to evaluate the clinical activity of CD. CD should always be suspected when the patient shows inflammatory lesions in MSCTE findings. The relationship between MSCTE findings and CRP/ESR is still controversial and further studies are necessary.
引文
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