Juergen Pohl

Computed Virtual Chromoendoscopy for Classification of Small Colorectal Lesions: A Prospective Comparative Study

OBJECTIVES:Standard colonoscopy offers no reliable discrimination between neoplastic and nonneoplastic colorectal lesions. Computed virtual chromoendoscopy with the Fujinon intelligent color enhancement (FICE) system is a new dyeless imaging technique that enhances mucosal and vascular patterns. This prospective trial compared the feasibility of FICE, standard colonoscopy, and conventional chromoendoscopy with indigo carmine in low- and high-magnification modes for determination of colonic lesion histology.METHODS:Sixty-three patients with 150 flat or sessile lesions less than 20 mm in diameter were enrolled. At colonoscopy, each lesion was observed with six different endoscopic modalities: standard colonoscopy, FICE, and conventional chromoendoscopy with indigo carmine (0.2%) dye spraying in both low- and high-magnification modes. Histopathology of all lesions was confirmed by evaluation of endoscopic resection or biopsy specimens. Endoscopic images were stored electronically and randomly allocated to a blinded reader.RESULTS:Of the 150 polyps, 89 were adenomas and 61 were hyperplastic polyps with an average size of 7 mm. For identifying adenomas, the FICE system with low and high magnifications revealed a sensitivity of 89.9% and 96.6%, specificity of 73.8% and 80.3%, and diagnostic accuracy of 83% and 90%, respectively. Compared with standard colonoscopy, the sensitivity and diagnostic accuracy achieved by FICE were significantly better under both low (P < 0.02) and high (P < 0.03) magnification and were comparable to that of conventional chromoendoscopy.CONCLUSIONS:The FICE system identified morphological details that efficiently predict adenomatous histology. For distinguishing neoplastic from nonneoplastic lesions, FICE was superior to standard colonoscopy and equivalent to conventional chromoendoscopy.

Efficacy, Safety, and Long-term Results of Endoscopic Treatment for Early Stage Adenocarcinoma of the Esophagus With Low-risk sm1 Invasion

BACKGROUND & AIMS Patients with early-stage mucosal (T1a) esophageal adenocarcinoma (EAC) are increasingly treated by endoscopic resection. EACs limited to the upper third of the submucosa (pT1b sm1) could also be treated by endoscopy. We assessed the efficacy, safety, and long-term effects of endoscopic therapy for these patients. METHODS We analyzed data from 66 patients with sm1 low-risk lesions (macroscopically polypoid or flat, with a histologic pattern of sm1 invasion, good-to-moderate differentiation [G1/2], and no invasion into lymph vessels or veins) treated by endoscopic therapy at the HSK Hospital Wiesbaden from 1996 through 2010. The efficacy of endoscopic therapy was assessed on the basis of rates of complete endoluminal remission (CER), metachronous neoplasia, lymph node events, and long-term remission (LTR). Safety was assessed on the basis of rate of complications. RESULTS Remissions were assessed in 61 of the 66 patients; 53 of the 61 achieved CER (87%). Of patients with small focal neoplasias ≤2 cm, 97% achieved CER (for those with tumors ≥2 cm, 77%; P = .026). Metachronous neoplasias were observed in 10 of 53 patients (19%; 9 of the 10 underwent repeat endoscopic resection). One patient developed a lymph node metastasis (1.9%). Fifty-one patients achieved LTR (84%); 90% of those with focal lesions ≤2 cm achieved LTR after a mean follow-up period of 47 ± 29.1 months (range, 8-120 months). No tumor-associated deaths were observed, and the estimated 5-year survival rate was 84%. The rate of major complications from endoscopic resection was 1.5%, and no patients died. CONCLUSIONS Endoscopic therapy appears to be a good alternative to esophagectomy for patients with pT1b sm1 EAC, on the basis of macroscopic and histologic analyses. The risk of developing lymph node metastases after endoscopic resection for sm1 EAC is lower than the risk of surgery.

Ablation of residual Barrett's epithelium after endoscopic resection: a randomized long-term follow-up study of argon plasma coagulation vs. surveillance (APE study).

BACKGROUND AND STUDY AIM It is commonly assumed that ablation of any remaining Barretts epithelium after endoscopic resection of early Barretts neoplasia improves outcome by reducing the rate of metachronous lesions, but this has not yet been evaluated in a randomized trial. The aim of this study was to compare argon plasma coagulation (APC) with surveillance only for the management of residual Barretts epithelium following endoscopic resection. PATIENTS AND METHODS Patients in whom focal early Barretts neoplasia (high grade intraepithelial neoplasia [HGIN] or mucosal cancer) had been curatively resected by endoscopy were randomly assigned to undergo ablation of the residual Barretts segment by APC or surveillance only; pH-metry-adjusted proton pump inhibitor therapy was administered in both groups. The main outcome parameter was recurrence-free survival. Follow-up endoscopies with biopsies in cases of further residual Barretts epithelium were carried out at 6-monthly intervals in both groups. RESULTS A total of 63 patients (57 male [90.5%]) were included in the study (ablation group n=33; surveillance group n=30). For complete Barretts ablation, a mean number of 4±1.6 APC sessions were required (range 2-7). The mean follow-up duration did not differ significantly between ablation (28.2±13.7 months, range 0-44) and surveillance patients (24.7±14.8 months, range 0-45; P=0.159). The number of secondary lesions was 1 in the ablation group (3%), and 11 in the surveillance group (36.7%), leading to significantly higher recurrence-free survival for the patients undergoing ablation (P=0.005). CONCLUSIONS Thermal ablation of residual Barretts epithelium leads to a significant reduction in neoplasia recurrence rate compared with a surveillance strategy during a limited follow-up of 2 years. A longer follow-up duration may have led to a relatively higher rate of secondary neoplasia in both groups of patients.

Incidence of Macroscopically Occult Neoplasias in Barrett's Esophagus: Are Random Biopsies Dispensable in the Era of Advanced Endoscopic Imaging?

OBJECTIVES:The gold standard for endoscopic surveillance of Barretts esophagus (BE) includes targeted biopsies (TBs) from abnormalities as well as stepwise four-quadrant biopsies (4QBs) for detection of invisible high-grade intraepithelial neoplasias (HGINs) or early carcinomas (ECs). In a large mixed BE population, we investigated the rate of HGINs/ECs that are macroscopically occult to enhanced visualization with high-resolution endoscopy plus acetic acid chromoendoscopy.METHODS:From January 2007 to December 2009, 701 consecutive BE patients were enrolled in a prospective study at a tertiary referral center. Of these, 406 patients had a history of HGIN/EC (high-risk group) and 295 patients did not (low-risk group).RESULTS:In 701 patients, 459 TBs and 5,485 4QBs were obtained. Altogether, 92 patients with 132 lesions containing HGINs/ECs were detected. For the diagnosis of HGINs/ECs, patient-related sensitivity and specificity rates of endoscopic imaging with TBs were 96.7 and 66.5%, with a positive and negative predictive value of 30.4 and 99.3%, respectively. In the high-risk group, 4QBs identified three additional patients (3.3%) with macroscopically occult HGINs/ECs. In the low-risk group, no HGINs/ECs were identified with either biopsy approach.CONCLUSIONS:Advanced endoscopic imaging identifies the vast majority of BE patients with early neoplasias, and the additive effect of 4QB is minimal. Therefore, in low- and high-risk patients, limiting endoscopic surveillance to guided biopsies is justified in specialized high-volume centers with permanent quality control. However, we do not advocate abandoning 4QB outside this setting.

Prospective randomized comparison of short-access mother-baby cholangioscopy versus direct cholangioscopy with ultraslim gastroscopes

BACKGROUND Mother-baby technologies, the criterion standard for cholangioscopy, have several limitations. A novel, short-access, mother-baby (SAMBA) system may improve this technique. Direct cholangioscopy (DC) was recently developed as an alternative to mother-baby cholangioscopy. OBJECTIVE Comparison of success rates with SAMBA and DC. DESIGN Single-center, randomized, controlled trial. SETTING Academic tertiary-care referral center. PATIENTS Sixty patients with suspected cholangiopathies randomized to either SAMBA (n = 30) or DC (n = 30). INTERVENTION Cholangioscopy under deep sedation. MAIN OUTCOME MEASUREMENTS Technical success rate of diagnostic or therapeutic procedure. RESULTS A total of 24 and 21 diagnostic procedures were performed in the SAMBA and DC groups, respectively. There were no significant differences in the overall technical success rates between SAMBA (90.0%) and DC (86.7%) (P = 1.0). There was better correlation between the endoscopic prediction and histologic findings in DC (P = .013). Procedure times were shorter in DC (P < .03). In patients without significant stenoses, SAMBA allowed intrahepatic bile duct exploration in all cases, compared with 10.5% of cases in DC (P < .01). No differences regarding adverse event rates between the groups occurred (10.0% both groups). LIMITATIONS Small sample size. Heterogeneous indications for cholangioscopy. DC requires advanced skills of the endoscopist. The study is not replicable. CONCLUSION SAMBA and DC offer high technical success rates for diagnostic and therapeutic interventions. The advantages of DC consist of superior imaging, shorter total procedure time, and a wider working channel for adequate tissue sampling. SAMBA is better than DC with regard to intraductal stability and accessibility of the intrahepatic bile ducts.

Endoscopic Resection of Early Esophageal and Gastric Neoplasias

The advent of endoscopic resection (ER) techniques has enabled gastroenterologists to remove premalignant or neoplastic lesions throughout the gastrointestinal tract. This review discusses the indications and the several techniques of ER in early carcinomas of the esophagus and stomach. Before ER is performed an accurate evaluation of patients and careful staging of lesions is mandatory. After ER of the neoplasia histological assessment of the entire specimen with detailed histological analysis of layer infiltration is crucial. First long-term follow-up studies of large numbers of patients confirm the excellent effectiveness of ER for well-differentiated mucosal lesions without lymphangitic invasions.

One-Step Chromoendoscopy and Structure Enhancement Using Balsamic Vinegar for Screening of Barrett's Esophagus

BACKGROUND AND STUDY AIMS Screening for specialized columnar epithelium (SCE) within columnar lined esophagus (CLE) with standard video endoscopes is not reliable enough. Several methods to improve accuracy of predicting presence of SCE like chromoendoscopy with vital stains or structure enhancement with acetic acid have been introduced but data up to now remains controversial. The present prospective study was conducted to evaluate a combination of chromoendoscopy and acetic acid structure enhancement using the naturally brownish coloured balsamic vinegar during routine upper endoscopy. PATIENTS AND METHODS Between March and July 2006 20 patients with macroscopic suspicion for SCE during routine endoscopy were included prospectively. Saline diluted balsamic vinegar (3%) was administered with a spraying catheter at the distal esophagus. After 1 minute the distal esophagus was evaluated for the presence of SCE according to the mucosal surface pattern (pattern I-II: round pits/circular pattern predicting gastric epithelium; pattern III-IV: ridged/villous pattern predicting Barretts epithelium). Only HR-videoendoscopes without magnification were used. After presence or absence of SCE was defined by the endoscopist targeted biopsies of the CLE were performed. Histological results were compared with endoscopic findings. RESULTS In 9 of 20 patients (13 male, 7 female; mean age 60.0 +/- 12.8 years) biopsy specimen revealed SCE within CLE on histology. Prediction of BM after balsamic vinegar staining was possible in all cases. Surface pattern I-II was found in 9 patients and pattern III-IV in 11 patients. Accuracy, sensitivity and specificity for BV staining predicting SCE were 90%, 100% and 82%, respectively. CONCLUSION Chromoendoscopy with balsamic vinegar combines the advantages of chromoendoscopy and structure enhancement by acetic acid for detection of SCE. The reliability in predicting the presence of SCE was high in this prospective feasibility study.