Browsing by Author "Navarathne, N.M."

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Acute upper gastrointestinal haemorrhage in Sri Lankan adults--single unit experience
(Sri Lanka Medical Association, 2010) Navarathne, N.M.; Thoufeek, U. L.; Abeysuriya, V.; Ileperuma, A.
No Abstract Available
Assessment of 'nucleation time' as a predictor of cholelithiasis
(Lippincott Williams And Wilkins, 2008) Abeysuriya, V.; Deen, K.I.; Kumarage, S.K.; Navarathne, N.M.
INTRODUCTION: In the formation of gallstones, crystal nucleation is a key step, which is followed by precipitation and gradual growth of cholesterol crystals. MATERIALS AND METHODS: A case-control study was carried out among 60 patients (30 patients, 14 males and 16 females, median age of 36 years, range 33-71 years, body mass index (BMI)=25.1+/-0.33 kg/m, who underwent laparoscopic cholecystectomy; 30 control individuals, 15 males and 15 females, median age of 38 years, range 33-70 years, BMI=24.5+/-0.23 kg/m, who underwent laparotomy and who had normal ultrasound scans of the gallbladder and no demonstrable stones). Bile aspirated from the common bile duct was ultrafiltered and anaerobically incubated at 37 degrees C. Incubated bile was examined daily by polarized light microscopy, for appearance of cholesterol crystals. Nucleation time (NT) of bile was assessed as the time taken for the first crystals to appear under polarized light microscopy. RESULTS: Age and BMI of control individuals were not different to those of cases studied. The overall mean NT was significantly shorter in patients versus controls (mean NT+/-SEM: patients, 1.76+/-0.2 days; vs. controls, 12.74+/-0.4 days, P=0.001). Of control individuals, females demonstrated a shorter NT compared with males (mean NT+/-SEM: females, 11.4+/-0.36 days; vs. males, 14.1+/-0.46 days, P=0.006). In contrast, there was no sex difference in NT in patients (mean NT+/-SEM: females, 1.7+/-0.24 days; vs. males, 1.8+/-0.2 days, P=0.7). CONCLUSION: NT in control individuals without gallstones was significantly prolonged compared with the NT in patients with established gallstone disease. Among the control individuals, females had a significantly shorter NT than males. Hence, the assessment of NT is predictor of cholelithiasis.
Biliary microlithiasis, sludge, crystals, microcrystallization, and usefulness of assessment of nucleation time
(Elsevier, 2010) Abeysuriya, V.; Deen, K.I.; Navarathne, N.M.
BACKGROUND: The process of microcrystallization, its sequel and the assessment of nucleation time is ignored. This systematic review aimed to highlight the importance of biliary microlithiasis, sludge, and crystals, and their association with gallstones, unexplained biliary pain, idiopathic pancreatitis, and sphincter of Oddi dysfunction. DATA SOURCES: Three reviewers performed a literature search of the PubMed database. Key words used were "biliary microlithiasis", "biliary sludge", "bile crystals", "cholesterol crystallisation", "bile microscopy", "microcrystal formation of bile", "cholesterol monohydrate crystals", "nucleation time of cholesterol", "gallstone formation", "sphincter of Oddi dysfunction" and "idiopathic pancreatitis". Additional articles were sourced from references within the studies from the PubMed search.RESULTS: We found that biliary microcrystals account for almost all patients with gallstone disease, 7% to 79% with idiopathic pancreatitis, 83% with unexplained biliary pain, and 25% to 60% with altered biliary and pancreatic sphincter function. Overall, the detection of biliary microcrystals in gallstone disease has a sensitivity ranging from 55% to 87% and a specificity of 100%. In idiopathic pancreatitis, the presence of microcrystals ranges from 47% to 90%. A nucleation time less than 10 days in hepatic bile or ultra-filtered gallbladder bile has a specificity of 100% for cholesterol gallstone disease.CONCLUSIONS: Biliary crystals are associated with gallstone disease, idiopathic pancreatitis, sphincter of Oddi dysfunction, unexplained biliary pain, and post-cholecystectomy biliary pain. Pathways of cholesterol super-saturation, crystallisation, and gallstone formation have been described with scientific support. Bile microscopy is a useful method to detect microcrystals and the assessment of nucleation time is a good method of predicting the risk of cholesterol crystallisation.
Endoscopic observations around the gastroesophageal junction in patients with symptomatic gastroesophageal reflux disease in South Asia
(Springer India, 2010) Navarathne, N.M.; Abeysuriya, V.; Ileperuma, A.; Thoufeek, U. L.
INTRODUCTION: We studied the inter-relationships of endoscopic findings around the gastroesophageal junction in patients with symptomatic gastroesophageal reflux. METHODS: Data were collected with regard to hiatus hernia (HH), columnar-lined esophagus (CLE), reflux esophagitis (RE) and gastroesophageal flap valve (GEFV), prospectively from 1,150 patients who underwent diagnostic upper gastrointestinal endoscopy for symptomatic gastroesophageal reflux. RESULTS: The frequency of HH, CLE and RE was 14.3% (n=165), 9.5% (n=109) and 13.3% (n=153), respectively. In the CLE group, 48 were histologically proven to have Barrett's esophagus. Of all RE patients, 94.8% had mild esophagitis (LA-A and B) and this was associated with younger age, male gender, presence of HH, and grade 3 or 4 gastroesophageal flap valve (GEFV). Grades 3 and 4 GEFV were associated with HH, CLE, and RE. CONCLUSIONS: Substantial proportion of patients with symptoms of GERD has abnormal endoscopic findings around the gastroesophageal junction
The Long-term outcomes of a cohort of Sri Lankan patients with ulcerative colitis: a retrospective study at two national referral centers and review of literature
(Dove Medical Press, 2013) Senanayake, S.M.; Fernandopulle, A.N.; Niriella, M.A.; Wijesinghe, N.T.; Ranaweera, A.; Mufeena, M.N.; Pathmeswaran, A.; Navarathne, N.M.; de Silva, A.P.; de Silva, H.J.
BACKGROUND: Inflammatory bowel disease, especially ulcerative colitis, is increasing in many "non-Western" countries, including Sri Lanka. The aim was to evaluate long-term outcomes of ulcerative colitis in a Sri Lankan population. METHODS: A retrospective cohort study was conducted at the gastroenterology clinics of the Colombo North Teaching Hospital, Ragama and the National Hospital of Sri Lanka, Colombo; the two major referral centers for ulcerative colitis. All cases had histological confirmation of ulcerative colitis. Three outcomes: colectomy, development of colorectal carcinoma, and death were assessed. Patients not attending the clinic during the previous 4 weeks, or their families, were contacted to obtain clinical details and survival status. In those who had died, the cause of death was confirmed from clinical records and death certificates. RESULTS: Details of 348/425 (81.9%) patients with ulcerative colitis (mean age 45.6 [standard deviation {SD} 14.3] years, male/female ratio = 1.00:1.03) were available. The mean follow-up was 6.8 (SD 6.5) years. The cumulative colectomy rates at 1, 5, 10, and 15 years were 1.5%, 4.0%, 5.5%, and 9.3% respectively. The cumulative probability of colorectal cancer in this cohort after 10 and 15 years was 0.47% and 2.36% respectively. The cumulative survival rate after 1, 5, 10, and 15 years was 99.7%, 98.9%, 98.1%, and 94.5% respectively. Patients with pancolitis were more likely to have disease-related death (P = 0.05). Multivariate analysis (Cox proportional hazards model) showed that an older age at diagnosis was associated with long-term mortality (hazard ratio, 1.11; P = 0.001). CONCLUSION: In this cohort, colectomy, colorectal carcinoma, and death rates were low, suggesting a relatively benign disease course for ulcerative colitis.