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( Rapat Pittayanon ),( Surasak Aumkaew ),( Rungsun Rerknimitr ),( Naruemon Wisedopas ),( Pinit Kullavanijaya ) 대한소화기학회 2016 대한소화기학회지 Vol.68 No.1
Background/Aims: Although flexible spectral imaging color enhancement (FICE) can facilitate the diagnosis of minimal change esophageal reflux disease (MERD), the complicated diagnostic criteria cause suboptimal inter-observer agreement. Confocal laser endomicroscopy (CLE) yields good diagnostic results but its inter-observer agreement has never been explored. This study compares the diagnostic value of magnifying FICE and probe-based CLE (pCLE) for MERD and evaluates the inter-observer agreement of both techniques. Methods: Thirty-six patients with suspected MERD and 18 asymptomatic controls were recruited. Magnifying FICE was used for evaluation of distal esophagus. pCLE counted the number of intrapapillary capillary loops (IPCLs) using more than five IPCLs in 500×500 micron area as a criterion for MERD diagnosis. The validity scores and interobserever agreement of both FICE and pCLE were assessed. Results: For FICE vs. pCLE, the accuracy was 79% vs. 87%, sensitivity 94% vs. 97%, specificity 50% vs. 66%, positive predictive value 79% vs. 85%, and negative predictive value 82% vs. 92%. Interobserver agreement of FICE was fair to substantial, whereas pCLE had substantial to almost perfect agreement. Conclusions: Both FICE and pCLE have good operating characteristics and can facilitate the MERD diagnosis. However, among different observers, pCLE is more consistent on MERD diagnosis. (Korean J Gastroenterol 2016;68:29-35)
Thailand Dyspepsia Guidelines: 2018
Rapat Pittayanon,Somchai Leelakusolvong,Ratha-korn Vilaichone,Jarin Rojborwonwitaya,Sombat Treeprasertsuk,Pisaln Mairiang,Supphamat Chirnaksorn,Taned Chitapanarux,Uayporn Kaosombatwattana,Jaksin Sotti 대한소화기 기능성질환∙운동학회 2019 Journal of Neurogastroenterology and Motility (JNM Vol.25 No.1
The management of dyspepsia in limited-resource areas has not been established. In 2017, key opinion leaders throughout Thailand gathered to review and evaluate the current clinical evidence regarding dyspepsia and to develop consensus statements, rationales, levels of evidence, and grades of recommendation for dyspepsia management in daily clinical practice based on the Grading of Recommendations, Assessment, Development, and Evaluation (GRADE) approach. This guideline is mainly focused on the following 4 topics: (1) evaluation of patients with dyspepsia, (2) management, (3) special issues (overlapping gastroesophageal reflux disease/irritable bowel syndrome and non-steroidal anti-inflammatory drug/aspirin use), and (4) long-term follow-up and management to provide guidance for physicians in Thailand and other limited-resource areas managing such patients.
Real-time semantic segmentation of gastric intestinal metaplasia using a deep learning approach
Vitchaya Siripoppohn,Rapat Pittayanon,Kasenee Tiankanon,Natee Faknak,Anapat Sanpavat,Naruemon Klaikaew,Peerapon Vateekul,Rungsun Rerknimitr 대한소화기내시경학회 2022 Clinical Endoscopy Vol.55 No.3
Background/Aims: Previous artificial intelligence (AI) models attempting to segment gastric intestinal metaplasia (GIM) areas havefailed to be deployed in real-time endoscopy due to their slow inference speeds. Here, we propose a new GIM segmentation AI modelwith inference speeds faster than 25 frames per second that maintains a high level of accuracy. Methods: Investigators from Chulalongkorn University obtained 802 histological-proven GIM images for AI model training. Fourstrategies were proposed to improve the model accuracy. First, transfer learning was employed to the public colon datasets. Second, animage preprocessing technique contrast-limited adaptive histogram equalization was employed to produce clearer GIM areas. Third,data augmentation was applied for a more robust model. Lastly, the bilateral segmentation network model was applied to segment GIMareas in real time. The results were analyzed using different validity values. Results: From the internal test, our AI model achieved an inference speed of 31.53 frames per second. GIM detection showed sensitivity,specificity, positive predictive, negative predictive, accuracy, and mean intersection over union in GIM segmentation values of 93%,80%, 82%, 92%, 87%, and 57%, respectively. Conclusions: The bilateral segmentation network combined with transfer learning, contrast-limited adaptive histogram equalization,and data augmentation can provide high sensitivity and good accuracy for GIM detection and segmentation.
Parit Mekaroonkamol,Kasenee Tiankanon,Rapat Pittayanon,Wiriyaporn Ridtitid,Fariha Shams,Ghias Un Nabi Tayyab,Julia Massaad,Saurabh Chawla,Stanley Khoo,Siriboon Attasaranya,Nonthalee Pausawasdi,Qiang C 대한소화기내시경학회 2022 Clinical Endoscopy Vol.55 No.2
Background/Aims: The Thai Association for Gastrointestinal Endoscopy published recommendations on safe endoscopyduring the coronavirus disease 2019 (COVID-19) pandemic. This study aimed to assess the practicality and applicability of therecommendations and the perceptions of endoscopy personnel on them. Methods: A validated questionnaire was sent to 1290 endoscopy personnel globally. Of these, the data of all 330 responders (25.6%)from 15 countries, related to the current recommendations on proper personal protective equipment (PPE), case selection, scopecleaning, and safety perception, were analyzed. Ordinal logistic regression was used to determine the relationships between thevariables. Results: Despite an overwhelming agreement with the recommendations on PPE (94.5%) and case selection (95.5%), theirpracticality and applicability on PPE recommendations and case selection were significantly lower (p=0.001, p=0.047, p<0.001, andp=0.032, respectively). Factors that were associated with lower sense of safety in endoscopy units were younger age (p=0.004), lessworking experience (p=0.008), in-training status (p=0.04), and higher national prevalence of COVID-19 (p=0.003). High prevalentcountries also had more difficulty implementing the guidelines (p<0.001) and they considered the PPE recommendations lesspractical and showed lower agreement with them (p<0.001 and p=0.008, respectively). A higher number of in-hospital COVID-19patients was associated with less agreement with PPE recommendations (p=0.039). Conclusions: Using appropriate PPE and case selection in endoscopic practice during a pandemic remains a challenge. Resourceavailability and local prevalence are critical factors influencing the adoption of the current guidelines.
Piyapan Prueksapanich,Thanawat Luangsukrerk,Rapat Pittayanon,Anapat Sanpavat,Rungsun Rerknimitr 대한소화기내시경학회 2019 Clinical Endoscopy Vol.52 No.2
Background/Aims: This study aimed to evaluate the diagnostic accuracy of dual-focus narrow-band imaging (dNBI) andLugol’schromoendoscopy (LCE) combined with probe-based confocal laser endomicroscopy (pCLE) to screen for esophageal squamouscell neoplasms (ESCNs) in patients with a history of head and neck cancer. Methods: From March to August 2016, dNBI was performed. Next, LCE was performed, followed by pCLE and biopsy. Histology hashistorically been the gold standard to diagnose ESCN. The sensitivity, specificity, positive predictive value (PPV), negative predictivevalue (NPV), and accuracy of dNBI and LCE adjunct with pCLE were determined. Results: Twenty-four patients were included. Ten ESCNs were found in 8 patients (33%). Forty percent of high-graded intraepithelialneoplasias and all low-grade intraepithelial neoplasias were overlooked by dNBI. The sensitivity, specificity, PPV, NPV, and accuracy ofdNBI vs. LCE combined with pCLE were 50% vs. 80%, 62% vs. 67%, 36% vs. 44%, 75% vs. 91%, and 83% vs. 70%, respectively. Conclusions: The use of dNBI to detect ESCN was suboptimal. LCE with pCLE following dNBI had additional value for detectingesophageal dysplasia not detected by dNBI. The use of pCLE to detect dNBI-missed lesions yielded a high NPV, while pCLE-guidedbiopsy could reduce the number of unnecessary biopsies.
Thailand Consensus on Helicobacter pylori Treatment 2015
Mahachai, Varocha,Vilaichone, Ratha-Korn,Pittayanon, Rapat,Rojborwonwitaya, Jarin,Leelakusolvong, Somchai,Kositchaiwat, Chomsri,Mairiang, Pisaln,Praisontarangkul, Ong-Ard,Ovartlarnporn, Buncha,Sottisu Asian Pacific Journal of Cancer Prevention 2016 Asian Pacific journal of cancer prevention Vol.17 No.5
Management of Helicobacter pylori infection is an important aspect of many upper gastrointestinal tract diseases, such as chronic gastritis, peptic ulcer disease, gastric cancer and mucosa-associated lymphoid tissue (MALT) lymphoma. The Thailand Consensus on H. pylori treatment 2015 consisted of 22 national experts who took active roles, discussed all important clinical information and investigated clinical aspects in four workshops, focuising on: (1) Diagnosis (2) Treatment (3) Follow-up after eradication and (4) H. pylori infection and special conditions. Experts were invited to participate on the basis of their expertise and contribution to H. pylori works and/or consensus methodology. The results of each workshop were taken to a final consensus vote by all experts. Recommendations were developed from the best evidence and availability to guide clinicians in management of this specific infection associated with variety of clinical outcomes.