[Recognition and assessment of celiac disease in children and adults: summary of NICE guideline]

Clinical guidelines “Chronic diarrhea in adults”

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Guidelines for the investigation of chronic diarrhoea in adults: British Society of Gastroenterology, 3rd edition

Chronic diarrhoea is a common problem, hence clear guidance on investigations is required. This is an updated guideline from 2003 for the investigations of chronic diarrhoea commissioned by the Clinical Services and Standards Committee of the British Society of Gastroenterology (BSG). This document has undergone significant revision in content through input by 13 members of the Guideline Development Group (GDG) representing various institutions. The GRADE system was used to appraise the quality of evidence and grading of recommendations.

Analysis of Biopsies From Duodenal Bulbs of All Endoscopy Patients Increases Detection of Abnormalities but has a Minimal Effect on Diagnosis of Celiac Disease

BACKGROUND & AIMS

In patients with positive results from serologic tests for celiac disease, analysis of tissues samples from the duodenal bulb, in addition to those from other parts of the small bowel, might increase the diagnostic yield. However, biopsies are not routinely collected from the duodenal bulb because of concerns that villous atrophy detected there could be caused by other disorders (Brunner glands or peptic duodenitis, gastric metaplasia, shorter villi, or lymphoid follicles). We investigated whether analysis of biopsies from duodenal bulbs of all patients undergoing endoscopy (a population with a low probability for celiac disease) increases diagnoses of celiac disease.

METHODS

We performed a retrospective analysis of data from 679 patients (63% female; mean age, 50 years) from whom duodenal bulb and small bowel biopsies were collected during endoscopy at 3 Mayo Clinic sites, from January 1, 2011 through December 31, 2011. Records were reviewed for age, sex, pathology findings, serology test results (HLA DQ2 or DQ), indications for biopsy analyses, and adherence to a gluten-free diet. Patients with celiac disease were identified on the basis of increased intraepithelial lymphocytosis, with or without villous atrophy and crypt hyperplasia, and results from serology tests. Findings from duodenal bulbs were compared with diagnoses using the Fisher exact test.

RESULTS

Of all patients undergoing endoscopy, 16 patients (2%) were found to have celiac disease. Analysis of the duodenal bulb biopsies identified 1 patient (0.1%) with celiac disease limited to this region. Of 399 patients whose celiac serology was not known before endoscopic examination, only 2 patients had histologic changes consistent with celiac disease but not limited to duodenal bulb. Abnormal duodenal histology was detected in 265 patients (39%), most commonly in the bulb (n = 241; P < .0001). Of abnormal bulb histologies, chronic peptic duodenitis was most common (observed in 114 patients, 47%). In patients with a normal distal duodenum (n = 576), the duodenal bulb had abnormal histology in 162 (28%).

CONCLUSIONS

In a low pretest probability cohort, separate sampling of the duodenal bulb had minimal effect on celiac disease detection. Abnormal histologic findings are more commonly detected in the duodenal bulb; although they do not seem to impair identification of celiac disease, their clinical implications are unclear.

Duodenal bulb biopsies for diagnosing adult celiac disease: is there an optimal biopsy site?

BACKGROUND

Recent studies highlight the role of duodenal bulb biopsy in the diagnosis of celiac disease.

OBJECTIVE

To determine whether a targeted duodenal bulb biopsy in addition to distal duodenal biopsies is the optimal strategy to identify villous atrophy.

DESIGN

Prospective cohort study.

SETTING

Tertiary-care referral center.

PATIENTS

Seventy-seven patients undergoing clinically indicated EGD with duodenal biopsies were recruited. Of these, 28 had newly diagnosed celiac disease and 49 were controls.

INTERVENTIONS

At endoscopy, 8 duodenal biopsy specimens were taken: 4 from the second part of the duodenum and 4 quadrantically from the bulb (at the 3-, 6-, 9-, and 12-o'clock positions).

MAIN OUTCOME MEASUREMENTS

Increasing the diagnostic yield and detection of the most severe villous atrophy in celiac disease with the addition of a targeted duodenal bulb biopsy.

RESULTS

The most severe degree of villous atrophy was detected when distal duodenal biopsy specimens were taken in addition to a duodenal bulb biopsy specimen from either the 9- or 12-o'clock position (96.4% sensitivity; 95% CI, 79.7%-100%). The difference between the 12-o'clock position biopsy and the 3-o'clock position biopsy in detecting the most severe villous atrophy was 92% (24/26) versus 65% (17/26) (P = .02).

LIMITATIONS

Small sample and study performed in a tertiary referral center.

CONCLUSIONS

This study demonstrates the patchy appearance of villous atrophy that occurs within the duodenum. A targeted duodenal bulb biopsy from either the 9- or 12-o'clock position in addition to distal duodenal biopsies may improve diagnostic yields by detecting the most severe villous atrophy within the duodenum.