Publications by authors named "Kevork Peltekian"

Background: Primary healthcare providers play a critical role in diagnosing and managing digestive disorders. Standardized clinical care guidelines have been developed, but with limited and inconsistent implementation. An evidence-based gastroenterology clinical care pathway (GUTLINK) has been proposed in one region of Canada; however, little is known in the medical literature about potential barriers to pathway implementation within primary care.

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  • Hereditary hemochromatosis (HH) is the most prevalent genetic disorder in Canada, primarily due to C282Y homozygosity, leading to iron overload and potential organ damage, but with low penetrance.
  • The study examined 23,432 individuals for TSat and ferritin levels as indicators of C282Y homozygosity, finding that C282Y homozygotes had significantly higher median levels compared to other genotypes.
  • TSat was identified as the most effective predictor of C282Y homozygosity, with specific thresholds that could greatly reduce unnecessary genotyping and save costs in healthcare management.
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  • The study looked at how patients with a liver disease called primary biliary cholangitis (PBC) respond to a treatment called ursodeoxycholic acid (UDCA).
  • It found that many patients (33%) didn’t have a good response after one year, and those who lost their good response had a higher chance of needing a liver transplant or dying.
  • The research showed that staying or getting back to a good response is important for improving long-term health.
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Background: Hereditary haemochromatosis protein (HFE)-related haemochromatosis, an inherited iron overload disorder caused by insufficient hepcidin production, results in excessive iron absorption and tissue and organ injury, and is treated with first-line therapeutic phlebotomy. We aimed to investigate the efficacy and safety of rusfertide, a peptidic mimetic of hepcidin, in patients with HFE-related haemochromatosis.

Methods: This open-label, multicentre, proof-of-concept phase 2 trial was done across nine academic and community centres in the USA and Canada.

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Background: Primary biliary cholangitis (PBC) is a rare, chronic autoimmune, cholestatic liver disease affecting approximately 318 per million Canadians. There is limited information regarding the characterization of this patient population in Canada. Consequently, we aim to describe a cohort of PBC patients managed across liver centres serving this type of population.

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Background: Non-alcoholic fatty liver disease (NAFLD) is increasingly common worldwide and can lead to the development of cirrhosis, liver failure and cancer. Virtual magnetic resonance elastography (VMRE), which is based on a shifted apparent diffusion coefficient (sADC), is a potential noninvasive method to assess liver fibrosis without the specialized hardware and expertise required to implement traditional MR elastography (MRE). Although hepatic steatosis is known to confound ADC measurements, previous studies using VMRE have not corrected for hepatic fat fraction.

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Background And Aims: We investigated associations between ethnicity, survival, and disease severity in a diverse Canadian cohort of patients with primary biliary cholangitis (PBC).

Approach And Results: Patients with PBC were included from the Canadian Network for Autoimmune Liver Disease. Ethnicity was defined using a modified list adopted from Statistics Canada, and ethnicities with small samples were grouped.

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Cutaneous squamous cell carcinoma (cSCC) is the second most common non-melanoma skin cancer worldwide, with ever increasing incidence and mortality. While most patients can be treated successfully with surgical excision, cryotherapy, or radiation therapy, there exist a subset of patients with aggressive cSCC who lack adequate therapies. Among these patients are solid organ transplant recipients who due to their immunosuppression, develop cSCC at a dramatically increased rate compared to the normal population.

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Background: Since December 2019, there are 30 million confirmed cases of a novel coronavirus disease (COVID-19) secondary to severe acute respiratory syndrome coronavirus 2. As of 2020, hepatitis B virus (HBV) affects more than 200 million people worldwide. Both are caused by viral agents.

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Many Canadians use cannabis for medicinal and recreational purposes. We describe the current understandings of how cannabis is metabolized in the liver and its potential interactions with other common drugs. We also summarize how cannabis may exert various effects in chronic liver diseases (CLDs), especially in chronic hepatitis C virus (HCV) and fatty liver disease.

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Background: There is a wealth of data documenting the epidemiology of primary biliary cholangitis (PBC) globally; however, the epidemiology of PBC has not been as well studied in Canada. Our study characterized the Canadian prevalence of PBC and the number of liver transplantations because of PBC.

Methods: For this retrospective cohort study we used national hospital administrative records from the Canadian Institute for Health Information, with the exception of Quebec for the prevalence estimate and Quebec and British Columbia for the transplant analysis.

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Background: This study evaluates the efficacy, safety, and tolerability of regimens containing sofosbuvir (SOF) in the treatment of hepatitis C virus (HCV) recurrence in all genotypes in patients outside of clinical trials in all Canadian transplant centers.

Methods: One hundred twenty liver transplantation recipients from across Canada with HCV recurrence were started on SOF-based regimens (SOF + simeprevir ± ribavirin (RBV), n = 53; SOF + pegylated interferon + RBV, n = 25; SOF + RBV, n = 36; and SOF + ledipasvir, n = 6) between January and November 2014. Mean age 58 ± 6.

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Background: Chronic infection with hepatitis C virus (HCV) is a major cause of cirrhosis, hepatocellular carcinoma and liver transplantation.

Objective: To estimate the burden of HCV-related disease and costs from a Canadian perspective.

Methods: Using a system dynamic framework, the authors quantified the HCV-infected population, disease progression and costs in Canada between 1950 and 2035.

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Background: The prevalence of infection with hepatitis C virus (HCV) is increasing worldwide. Antiviral therapy, prescription and nonprescription medications, and nondrug therapies to treat HCV infection and to manage associated adverse effects are costly.

Objective: To determine whether individuals infected with HCV attending a hepatology clinic were negatively affected by the costs of prescription medications, and if so, to determine coping strategies they adopted.

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Aim: To characterize the efficacy of rifaximin in the management of hepatic encephalopathy (HE) as several randomized controlled studies have shown contradictory results on its effectiveness in comparison to other oral agents.

Methods: We performed a systematic review and random effects meta-analysis of all eligible trials identified through electronic and manual searches. Twelve randomized controlled trials met the inclusion criteria with a total of 565 patients.

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Background: Current practice guidelines recommend liver biopsy prior to treatment of hepatitis C genotype-1 but not for genotype-2/3; this is based on expert opinion, not on published evidence.

Methods: In retrospective analysis of a large trial database prior to the publication of recent guidelines, we compared outcomes in 985 treatment-naïve patients with hepatitis C who did or did not undergo liver biopsy before starting peginterferon alfa-2a plus ribavirin.

Results: Physicians elected to treat 141/654 (21.

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Background: The use of simultaneous liver kidney transplantation has increased dramatically. When the liver and kidney are available from the same deceased donor, what is the best decision? There are two allocation options. In the combined allocation, both organs are allocated to a liver failure (end-stage liver disease [ESLD]) patient on dialysis leaving an end-stage renal disease (ESRD) patient on dialysis.

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