Promoteur(s) :
Western Sydney Local Health District
Recrutement : ouvert
Centres participants
1
Dernière modification : 2025-03-29
DESCRIPTION DE L'ÉTUDE
Résumé de l'étude
A randomized controlled crossover study to determine if narrow band imaging or white light endoscopy is superior in detecting right colonic polyps in average risk subjects undergoing screening colonoscopy
Source : Importé depuis le centre
Removal of colorectal adenomas prevents occurrence of cancers. It is recognized that colonoscopy can miss colorectal adenomas and early cancers. Proximal colon polyp detection rate is lower compared to distal colon detection rates. This may be partially due to the higher prevalence of flat polyps and sessile serrated adenomas (SSAs) which are harder to visualize. There is a need to further improve performance of colonoscopy. A second evaluation of the right colon within the same procedure may yield an additional detection rate of 5-10%, however retro-flexion has not proven to be superior to a second forward viewing examination. The use of chromo-endoscopy has been shown to improve detection of flat adenomas. Narrow band imaging was introduced in year 2006. It is similar to chromo-endoscopy in that it provides more mucosal details. This enables endoscopists to accurately describe the pit pattern of adenomas. NBI has been used as a substitute to chromo-endoscopy. In pooled analysis, NBI is comparable to chromo-endoscopy in their sensitivity and specificity in the diagnosis of malignant colorectal adenomas. Unfortunately, the use of NBI has not been shown to conclusively improve rate of colorectal adenoma detection. Two of 3 randomized trials that compared WLE to NBI showed a higher adenoma detection rate with the use of NBI. In a study by Rex et al., the rate was however similar with either modality. In a pooled analysis, NBI was only marginally better than WLE.
The effective use of NBI depends on the quality of bowel preparation and the experience of endoscopist. In the presence of fecal matters, NBI tends to be dark and detection of small adenomas becomes difficult. The prototype bright NBI coupled with high definition resolution is likely to overcome this drawback of original NBI.
Source : Importé depuis le centre
RECRUTEMENT
Profil des participants
Limites d'âge
minimum : 18 ans
Sexe(s) des participants
ALL
Source : Importé depuis le centre
Condition médicale (spécialité visée)
Domaine de recherche
Donnée non disponible
Critères de sélection
Cohortes
Nom
Condition médicale
Traitement
État du recrutement
First withdrawal - White light endoscopy
white light (WLE) high definition colonoscope (Olympus 190 series) first and then B-NBI
Donnée non disponible
Inconnu
First withdrawal - Bright Narrow Band Imagin
B-NBI first and then WLE with the same colonoscope.
Donnée non disponible
Inconnu
First withdrawal - White light endoscopy
État du recrutement
unknown
white light (WLE) high definition colonoscope (Olympus 190 series) first and then B-NBI
First withdrawal - Bright Narrow Band Imagin
État du recrutement
unknown
B-NBI first and then WLE with the same colonoscope.
* Asymptomatic subjects undergoing screening colonoscopy
* age \> 50.
* average risk subjects defined as those without a personal history of inflammatory bowel disease, colon adenoma or cancer or family history of FAP or Familial non-polyposis syndrome or first degree relatives having diagnosed to have colo-rectal carcinoma, no colonoscopy in past 5 years and, ability to provide a written consent to trial participation
Exclusion Criteria:
* unable to consent
Source : Importé depuis le centre
Cohortes
Thérapie ou Intervention proposée
Cohortes
Nom
Condition médicale
Traitement
État du recrutement
First withdrawal - White light endoscopy
white light (WLE) high definition colonoscope (Olympus 190 series) first and then B-NBI
Donnée non disponible
Inconnu
First withdrawal - Bright Narrow Band Imagin
B-NBI first and then WLE with the same colonoscope.
Donnée non disponible
Inconnu
First withdrawal - White light endoscopy
État du recrutement
unknown
white light (WLE) high definition colonoscope (Olympus 190 series) first and then B-NBI
First withdrawal - Bright Narrow Band Imagin
État du recrutement
unknown
B-NBI first and then WLE with the same colonoscope.
Données à jour depuis :
29 mars 2025
Description de l'étude
Description de l'étude
Résumé de l'étude
A randomized controlled crossover study to determine if narrow band imaging or white light endoscopy is superior in detecting right colonic polyps in average risk subjects undergoing screening colonoscopy
Source : Importé depuis le centre
Removal of colorectal adenomas prevents occurrence of cancers. It is recognized that colonoscopy can miss colorectal adenomas and early cancers. Proximal colon polyp detection rate is lower compared to distal colon detection rates. This may be partially due to the higher prevalence of flat polyps and sessile serrated adenomas (SSAs) which are harder to visualize. There is a need to further improve performance of colonoscopy. A second evaluation of the right colon within the same procedure may yield an additional detection rate of 5-10%, however retro-flexion has not proven to be superior to a second forward viewing examination. The use of chromo-endoscopy has been shown to improve detection of flat adenomas. Narrow band imaging was introduced in year 2006. It is similar to chromo-endoscopy in that it provides more mucosal details. This enables endoscopists to accurately describe the pit pattern of adenomas. NBI has been used as a substitute to chromo-endoscopy. In pooled analysis, NBI is comparable to chromo-endoscopy in their sensitivity and specificity in the diagnosis of malignant colorectal adenomas. Unfortunately, the use of NBI has not been shown to conclusively improve rate of colorectal adenoma detection. Two of 3 randomized trials that compared WLE to NBI showed a higher adenoma detection rate with the use of NBI. In a study by Rex et al., the rate was however similar with either modality. In a pooled analysis, NBI was only marginally better than WLE.
The effective use of NBI depends on the quality of bowel preparation and the experience of endoscopist. In the presence of fecal matters, NBI tends to be dark and detection of small adenomas becomes difficult. The prototype bright NBI coupled with high definition resolution is likely to overcome this drawback of original NBI.
