Background
Peroral endoscopic myotomy (POEM) is a novel, minimally invasive treatment for esophageal achalasia. We retrospectively examined and evaluated the results following POEM to verify the ...technique’s efficacy and safety.
Methods
We retrospectively analyzed data for patients who underwent POEM at eight Japanese facilities between September 2008 and October 2015. Pre- and postoperative assessments 3 months and 1 year after POEM included patient interviews, endoscopy, and manometry.
Results
A total of 1346 patients underwent POEM during the study period. Achalasia was the straight type in 1105 patients (82%) and the sigmoid type in 241 patients (18%). The average patient age was 47.2 years (range 3–95 years); 617 patients (46%) were men and 729 (54%) were women. Previous treatment included balloon dilatation in 381 patients (28%) and Heller–Dor operation in 43 patients (3%). The average operation time was 99.6 min. The mean length of the myotomy in the esophageal body was 10.8 cm, and the myotomy extended into the stomach a mean of 2.8 cm. The response rate (Eckardt score ≤ 3) was 95.1% 3 months postoperatively and 94.7% 1 year postoperatively. We noted 50 adverse events (3.7%) of Clavien–Dindo classification grade ≤ IIIa, and all resolved with conservative treatment. There were no Clavien–Dindo classification grade ≥ IIIb adverse events. After POEM, erosive esophagitis according to the Los Angeles classification was absent in 37% of the patients, grade A in 33%, B in 24%, C in 6%, and D in 0.2%. Symptomatic gastroesophageal reflux disease after POEM was confirmed in 14.8% of the patients; both erosive esophagitis and symptomatic gastroesophageal reflux disease responded to treatment with a proton-pump inhibitor.
Conclusion
Our results confirmed the safety and efficacy of POEM in a large patient series and support POEM as the first-line and standard treatment for esophageal achalasia.
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EMUNI, FIS, FZAB, GEOZS, GIS, IJS, IMTLJ, KILJ, KISLJ, MFDPS, NLZOH, NUK, OBVAL, OILJ, PNG, SAZU, SBCE, SBJE, SBMB, SBNM, UKNU, UL, UM, UPUK, VKSCE, ZAGLJ
During the coronavirus disease 2019 pandemic, whether endoscopy generates aerosols needs to be determined.
In patients undergoing upper gastrointestinal endoscopy with an enclosure covering their ...heads, 0.3-10-μm aerosols were measured for 60 seconds before, during, and after endoscopy by an optical counter. Whether aerosols increased in the situation with and without endoscopy was examined.
The analysis included 103 consecutive patients undergoing endoscopy and 90 control patients. Aerosols increased significantly during endoscopy compared with the control group. Body mass index and burping were significant factors related to increased aerosols during endoscopy.
Upper gastrointestinal endoscopy was an aerosol-generating procedure.
Background and study aims
The diagnostic ability of endoscopists to determine invasion depth of early gastric cancer is not favorable. We designed an artificial intelligence (AI) classifier for ...differentiating intramucosal and submucosal gastric cancers and examined it to establish a diagnostic method based on cooperation between AI and endoscopists.
Patients and methods
We prepared 500 training images using cases of mainly depressed-type early gastric cancer from 250 intramucosal cancers and 250 submucosal cancers. We also prepared 200 test images each of 100 cancers from another institution. We designed an AI classifier to differentiate between intramucosal and submucosal cancers by deep learning. We examined the performance of the AI classifier and the majority vote of the endoscopists as high confidence and low confidence diagnostic probability, respectively, and cooperatively combined them to establish a diagnostic method providing high accuracy.
Results
Internal evaluation of the training images showed that accuracy, sensitivity, specificity, and F1 measure by the AI classifier were 77%, 76%, 78%, and 0.768, and those of the majority vote of the endoscopists were 72.6%, 53.6%, 91.6%, and 0.662, respectively. A diagnostic method based on cooperation between AI and the endoscopists showed that the respective values were 78.0%, 76.0%, 80.0%, and 0.776 for the test images. The value of F1 measure was especially higher than those by AI or the endoscopists alone.
Conclusions
Cooperation between AI and endoscopists improved the diagnostic ability to determine invasion depth of early gastric cancer.
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EMUNI, FIS, FZAB, GEOZS, GIS, IJS, IMTLJ, KILJ, KISLJ, MFDPS, NLZOH, NUK, OILJ, PNG, SAZU, SBCE, SBJE, SBMB, SBNM, UKNU, UL, UM, UPUK, VKSCE, ZAGLJ
Background:
To our knowledge, no nationwide epidemiological study of myelin oligodendrocyte glycoprotein antibody-associated disease (MOGAD) has been conducted.
Objective:
We examined the ...epidemiology and clinical features of MOGAD in Japan.
Methods:
We distributed questionnaires on the clinical characteristics of patients with MOGAD to neurology, pediatric-neurology, and neuro-ophthalmology facilities throughout Japan.
Results:
In total, 887 patients were identified. The estimated number of total and newly diagnosed MOGAD patients was 1,695 95% confidence interval (CI): 1483–1907 and 487 (95% CI: 414–560), respectively. The estimated prevalence and incidence were 1.34/100,000 (95% CI: 1.18–1.51) and 0.39/100,000 (95% CI: 0.32–0.44), respectively. The median age at onset was 28 years (range: 0–84 years). At onset, optic neuritis was present in approximately 40% of patients, irrespective of the onset age. Acute disseminated encephalomyelitis was more frequent in younger patients, whereas brainstem encephalitis, encephalitis, and myelitis were more frequent in elderly patients. Immunotherapy was highly effective.
Conclusion:
The prevalence and incidence rates of MOGAD in Japan are similar to those in other countries. Notable characteristics such as the preferential occurrence of acute disseminated encephalomyelitis in children exist; however, general characteristics including symptoms and treatment response are common irrespective of the onset age.
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NUK, OILJ, SAZU, UKNU, UL, UM, UPUK
Objectives
Although whole and individual regional brain volume loss have been separately reported to correlate with disability in multiple sclerosis (MS), hierarchical cluster analyses of the whole ...and regional brain to find their pattern in MS are few.
Methods
We cross-sectionally conducted high-resolution, T1-weighted volumetric MRI examinations in 75 MS patients and 21 healthy controls (HCs) to measure the volumes of whole brain and a total of 56 brain regions of interest. Using a hierarchical cluster analysis with multivariate imaging data, we classified the patients into clusters according to their brain-volume patterns. Principal component analysis was also applied. Clinical features and brain volumes were then compared among the MS clusters.
Results
The MS patients were categorized into three major clusters (Clusters 1, 2, and 3) with increasing disability in that order. Principal component analysis also identified Clusters 1, 2 and 3. Whole brain volume and supratentorial regional brain volumes, including thalamus and corpus callosum, decreased severely in Cluster 3 and moderately in Cluster 2, while equally preserved in Cluster 1 and the HCs. Only the volumes of the ventral diencephalon and T1 white matter hypointensities significantly differed in Clusters 1, 2 and 3 and HCs. In contrast, the volumes of the cerebellar cortex and brainstem were significantly different between Clusters 3 and 1, whereas there were no significant differences between Clusters 1 and 2 and Clusters 2 and 3.
Conclusion
We identified brain regions that exhibit different degree of atrophy in a background of global brain atrophy in MS.
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EMUNI, FIS, FZAB, GEOZS, GIS, IJS, IMTLJ, KILJ, KISLJ, MFDPS, NLZOH, NUK, OBVAL, OILJ, PNG, SAZU, SBCE, SBJE, SBMB, SBNM, UKNU, UL, UM, UPUK, VKSCE, ZAGLJ
Accumulation of adipocytes and collagen type-I-producing cells (fibrosis) is observed in muscular dystrophies. The origin of these cells had been largely unknown, but recently we identified ...mesenchymal progenitors positive for platelet-derived growth factor receptor alpha (PDGFRα) as the origin of adipocytes in skeletal muscle. However, the origin of muscle fibrosis remains largely unknown. In this study, clonal analyses show that PDGFRα(+) cells also differentiate into collagen type-I-producing cells. In fact, PDGFRα(+) cells accumulated in fibrotic areas of the diaphragm in the mdx mouse, a model of Duchenne muscular dystrophy. Furthermore, mRNA of fibrosis markers was expressed exclusively in the PDGFRα(+) cell fraction in the mdx diaphragm. Importantly, TGF-β isoforms, known as potent profibrotic cytokines, induced expression of markers of fibrosis in PDGFRα(+) cells but not in myogenic cells. Transplantation studies revealed that fibrogenic PDGFRα(+) cells mainly derived from pre-existing PDGFRα(+) cells and that the contribution of PDGFRα(-) cells and circulating cells was limited. These results indicate that mesenchymal progenitors are the main origin of not only fat accumulation but also fibrosis in skeletal muscle.
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