Accuracy and interrater reliability for the diagnosis of Barrett's neoplasia among users of a novel, portable high-resolution microendoscope

The high-resolution microendoscope (HRME) is a novel imaging modality that may be useful in the surveillance of Barrett's esophagus in low-resource or community-based settings. In order to assess accuracy and interrater reliability of microendoscopists in identifying Barrett's-associated neoplasia using HRME images, we recruited 20 gastroenterologists with no microendoscopic experience and three expert microendoscopists in a large academic hospital in New York City to interpret HRME images. They prospectively reviewed 40 HRME images from 28 consecutive patients undergoing surveillance for metaplasia and low-grade dysplasia and/or evaluation for high-grade dysplasia or cancer. Images were reviewed in a blinded fashion, after a 4-minute training with 11 representative images. All imaged sites were biopsied and interpreted by an expert pathologist. Sensitivity of all endoscopists for identification of high-grade dysplasia or cancer was 0.90 (95% confidence interval [CI]: 0.88-0.92) and specificity was 0.82 (95% CI: 0.79-0.85). Positive and negative predictive values were 0.72 (95% CI: 0.68-0.77) and 0.94 (95% CI: 0.92-0.96), respectively. No significant differences in accuracy were observed between experts and novices (0.90 vs. 0.84). The kappa statistic for all raters was 0.56 (95% CI: 0.54-0.58), and the difference between groups was not significant (0.64 vs. 0.55). These data suggest that gastroenterologists can diagnose Barrett's-related neoplasia on HRME images with high sensitivity and specificity, without the aid of prior microendoscopy experience.

High resolution microendoscopy for classification of colorectal polyps

BACKGROUND AND STUDY AIMS

It can be difficult to distinguish adenomas from benign polyps during routine colonoscopy. High resolution microendoscopy (HRME) is a novel method for imaging colorectal mucosa with subcellular detail. HRME criteria for the classification of colorectal neoplasia have not been previously described. Study goals were to develop criteria to characterize HRME images of colorectal mucosa (normal, hyperplastic polyps, adenomas, cancer) and to determine the accuracy and interobserver variability for the discrimination of neoplastic from non-neoplastic polyps when these criteria were applied by novice and expert microendoscopists.

METHODS

Two expert pathologists created consensus HRME image criteria using images from 68 patients with polyps who had undergone colonoscopy plus HRME. Using these criteria, HRME expert and novice microendoscopists were shown a set of training images and then tested to determine accuracy and interobserver variability.

RESULTS

Expert microendoscopists identified neoplasia with sensitivity, specificity, and accuracy of 67 % (95 % confidence interval [CI] 58 % - 75 %), 97 % (94 % - 100 %), and 87 %, respectively. Nonexperts achieved sensitivity, specificity, and accuracy of 73 % (66 % - 80 %), 91 % (80 % - 100 %), and 85 %, respectively. Overall, neoplasia were identified with sensitivity 70 % (65 % - 76 %), specificity 94 % (87 % - 100 %), and accuracy 85 %. Kappa values were: experts 0.86; nonexperts 0.72; and overall 0.78.

CONCLUSIONS

Using the new criteria, observers achieved high specificity and substantial interobserver agreement for distinguishing benign polyps from neoplasia. Increased expertise in HRME imaging improves accuracy. This low-cost microendoscopic platform may be an alternative to confocal microendoscopy in lower-resource or community-based settings.

Surgical management of hand contractures and pseudosyndactyly in dystrophic epidermolysis bullosa

The term epidermolysis bullosa refers to a group of disorders characterized by skin blistering following minor trauma. The hands, because of constant use during normal daily activity, are especially exposed to blistering, with secondary scarring leading to pseudosyndactyly, adduction contracture of the thumb, and flexion or extension contracture of the fingers. The standard surgical approach for the correction of these deformities is based on the incisional release of pseudosyndactyly and contractures, and split skin grafting of the secondary wounds. A simplified approach without skin grafting is presented in this paper. Four children (8 hands) underwent 25 operations over two decades. The results, in terms of postoperative healing and recurrence, were comparable with those of the standard approach involving skin grafting.

Does double gloving protect surgical staff from skin contamination during plastic surgery?

In a randomized study, the effectiveness of double gloving in maintaining an intact barrier between the patient and the hands of the surgical staff during plastic surgery operations was tested. For 2 months, the surgical staff of a plastic surgery unit randomly wore single or double gloves during all elective surgical procedures. At the end of the operations, the gloves were tested by the water filling test. A total of 1092 gloves were examined. Twelve accidental injuries were noticed during the operations, and 67 unnoticed perforations occurred. The data suggest that the risk of perforation and exposure increases with the length and complexity of the procedures. It was concluded that double gloving is effective in plastic surgery, inasmuch as the barrier protection was maintained by the inner glove in two of three cases in which the outer glove was perforated inadvertently. Plastic surgeons must balance the improved security of double gloving with the possible discomfort or reduced sensitivity.

[Reconstruction of the nose using expanded forehead flap]

The history of using forehead flaps for nasal reconstruction is reviewed. A case of nasal reconstruction in a man who underwent amputation for squamous cell carcinoma is reported. The surface of the forehead flap was augmented by expanded tissues at the donor site. We describe the surgical procedure and its excellent results.