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One of the fatal and debilitating neurodegenerative diseases is amyotrophic lateral sclerosis (ALS). Increasing age is one of the risk factors of ALS. Considering that the elderly population in the world is increasing, it is very important to identify useful and effective diagnostic and treatment methods. The purpose of this systematic review is to determine the relationship between chitotriosidase (CHIT1) level and ALS disorder.Keywords “Amyotrophic Lateral Sclerosis”, “Gehrig* Disease”, “Charcot Disease”, “Guam Disease”, ALS, CHIT1 and chitotriosidase were searched in PubMed, Scopus, Web of Science and Science Direct databases without time limit on September 2023. Hundred twenty studies were obtained by searching, and finally, 14 studies were included in this study using the inclusion and exclusion criteria. In all 14 selected studies, the level of biomarker CHIT1 in the CSF of ALS patients was significantly higher than that of healthy control and disease control groups. But, in 8 studies that included 3 groups, no significant difference was observed between the CHIT1 levels in the two control groups. Six studies have reported the amount of CHIT1 level quantitatively. Among these 6 studies, in 5 studies CHIT1 level in disease control was higher than healthy control (not significant) and in only one study CHIT1 level was higher in healthy control compared to disease control (not significant).In all 14 studies, a multifold increase in CHIT1 levels has been observed in patients compared to healthy and disease control groups. Therefore, based on the findings of the studies, this study confirms the relationship between CHIT1 increase and ALS disorder. [ABSTRACT FROM AUTHOR]

Introduction and Objective: Hilar cholangiocarcinoma (HCCA) is a rare malignancy in patients with biliary disease. If jaundice and obstruction before surgery are left untreated, then they can cause side effects such as cholangitis, delayed tumor treatment, decreased quality of life, and increased mortality. Surgery is the main treatment for HCCA. Therefore, this study was performed to compare the efficacy and complications of percutaneous transhepatic biliary drainage (PTBD) and endoscopic biliary drainage (EBD). Methods: This cohort study was conducted on 20 patients with biliary obstruction who had been selected by simple random sampling and divided into two groups of EBD and PTBD. Three weeks after surgery, patients were compared in terms of bilirubin levels and postoperative complications. Data were analyzed by descriptive statistics (table, mean, and standard deviation) and inferential statistics (independent t-test, Chi-square test, and Fisher's test). Results: Independent t-test did not show a significant difference between the two groups in terms of bilirubin level (P = 0.77). However, despite a decrease in bilirubin level in both groups, independent t-test showed that this difference was not significant (P = 0.08). Fisher's exact test showed a significant difference between the two groups in terms of postoperative complications (P = 0.02). Conclusion: Using both drainage methods before surgery reduced bilirubin levels in patients, but EBD method had fewer side effects than PTBD method. The EBD method was performed under the direct supervision of a gastroenterologist. In performing this procedure, specialist physicians should have more supervision. [ABSTRACT FROM AUTHOR]