Comparison of high-resolution magnification narrow-band imaging and white-light endoscopy in the prediction of histology in Barrett's oesophagus.
Scand J Gastroenterol
; 44(1): 85-92, 2009.
Article
in En
| MEDLINE
| ID: mdl-18821132
ABSTRACT
OBJECTIVE:
To evaluate whether there is any appreciable difference in imaging characteristics between high-resolution magnification white-light endoscopy (WLE-Z) and narrow-band imaging (NBI-Z) in Barrett's oesophagus (BE) and if this translates into superior prediction of histology. MATERIAL ANDMETHODS:
This was a prospective single-centre study involving 21 patients (75 areas, corresponding NBI-Z and WLE-Z images) with BE. Mucosal patterns (pit pattern and microvascular morphology) were evaluated for their image quality on a visual analogue scale (VAS) of 1-10 by five expert endoscopists. The endoscopists then predicted mucosal morphology based on four subtypes which can be visualized in BE. Type A round pits, regular microvasculature; type B villous/ridge pits, regular microvasculature; type C absent pits, regular microvasculature; type D distorted pits, irregular microvasculature. The sensitivity (Sn), specificity (Sp), positive predictive value (PPV), negative predictive value (NPV) and accuracy (Acc) were then compared with the final histopathological analysis and the interobserver variability calculated.RESULTS:
The overall pit and microvasculature quality was significantly higher for NBI-Z, pit NBI-Z=6, WLE-Z=4.5, p < 0.001; microvasculature NBI-Z=7.3, WLE-Z=4.9, p < 0.001. This translated into a superior prediction of histology (Sn NBI-Z 88.9, WLE-Z 71.9, p < 0.001). For the prediction of dysplasia, NBI-Z was superior to WLE-Z (chi(2)=10.3, p < 0.05). The overall kappa agreement among the five endoscopists for NBI-Z and WLE-Z, respectively, was 0.59 and 0.31 (p < 0.001).CONCLUSIONS:
NBI-Z is superior to WLE-Z in the prediction of histology in BE, with good reproducibility. This novel imaging modality could be an important tool for surveillance of patients with BE.
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Main subject:
Barrett Esophagus
/
Image Enhancement
/
Esophagoscopy
/
Esophagus
Type of study:
Diagnostic_studies
/
Observational_studies
/
Prognostic_studies
/
Risk_factors_studies
Limits:
Adult
/
Aged
/
Aged80
/
Female
/
Humans
/
Male
/
Middle aged
Language:
En
Journal:
Scand J Gastroenterol
Year:
2009
Document type:
Article
Affiliation country:
United kingdom