Publications by authors named "John D Chetwood"

Background/aims: There are spare data on comparative medication efficacy in fistulizing Crohn's disease (FCD), particularly with immunomodulator co-therapy. Persistence is a unique way to assess real-world outcomes.

Methods: The persistence of all dispensed biological agents were analysed from the Australian Pharmaceutical Benefits Scheme (PBS) registry data 2005-2021 for FCD.

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Article Synopsis
  • New advanced therapies for inflammatory bowel diseases (IBDs) require enhanced risk management strategies to ensure patient safety during treatment.
  • A comprehensive set of eight statements was developed through literature review and expert consensus, focusing on assessments and vaccinations needed before starting therapies like JAK inhibitors and S1P modulators.
  • Key findings include the necessity for infectious disease screenings, updated vaccination protocols, and specific risk assessments for malignancies and cardiovascular issues to reduce IBD complications associated with these advanced treatments.
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Metastatic Crohn's disease is the rarest cutaneous manifestation of Crohn's disease, it presents as cutaneous lesions in areas that are anatomically non-contiguous with the gastrointestinal tract. It requires a high index of suspicion for diagnosis which is confirmed on histopathology. Infliximab can be an effective treatment.

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Background: Subcutaneous [SC] infliximab may provide multiple benefits over intravenous [IV] formulations. However, studies for efficacy and safety in inflammatory bowel disease [IBD] have been constrained by small sizes that limit the interpretation of outcomes, particularly for subgroups potentially at high risk of disease relapse.

Methods: We conducted a systematic review and random-effects meta-analysis up to January 2023, to evaluate the change in clinical remission after transitioning from IV to SC infliximab in patients with IBD in clinical remission.

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Acute allograft rejection is a well-known complication of liver transplantation (LT). The incidence, epidemiology, and outcomes of acute rejection have not been well described in Australia. We retrospectively studied consecutive adults who underwent deceased donor LT at a single center between 2010 and 2020.

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Paraneoplastic gastrointestinal dysmotility is a rare entity which occurs in association with malignancy. We present the second case associated with lymphoma, characterised by generalised gastrointestinal dysmotility with constipation, malnutrition, weight loss, and capsule endoscope retention. This case highlights the importance of maintaining a high index of suspicion for malignancy in patients with unexplained gastrointestinal dysmotility.

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Article Synopsis
  • Comparative effectiveness research in Crohn's disease has limited studies comparing advanced therapies, highlighting the need for data on treatment persistence in real-world settings.
  • An analysis of Australian national data from 2005-2019 revealed that ustekinumab showed significantly better treatment persistence compared to other biological agents after initial therapy.
  • The study found that ustekinumab's effectiveness was consistent regardless of previous treatments, making it a promising option for patients with multiple therapy experiences.
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Background And Aim: Acute-on-chronic liver failure (ACLF) is distinct from acute decompensation (AD) of cirrhosis in its clinical presentation, pathophysiology, and prognosis. There are limited published Australian ACLF data.

Methods: We performed a single-center retrospective cohort study of all adults with cirrhosis admitted with a decompensating event to a liver transplantation (LT) centre between 2015 and 2020.

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Cystic fibrosis (CF) is a complex multiorgan disease, which often affects the gastrointestinal tract. With improved CF specific therapies and multidisciplinary management, patients with CF are now living longer with a median life expectancy of around 50 years. This increased life expectancy has resulted in corresponding increase in presentations of the CF patient with comorbid surgical conditions that were never important considerations.

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Background: Controversy exists regarding the best predictive model of liver transplant waiting list (WL) mortality. Models for end-stage liver disease-glomerular filtration rate assessment in liver disease (MELD-GRAIL) and MELD-GRAIL-Na were recently described to provide better prognostication, particularly in females. We evaluated the performance of these scores compared to MELD and MELD-Na.

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We describe an unusual endoscopic finding, caused by a dominant ovarian follicle compressing a low-lying ascending colon just inferior to a patulous retroverted cecum. Endoscopically detected extra-colonic lesions represent a diverse group of pathologies, and it is important the endoscopist has an appreciation of the varied number of benign and malignant causes-including those of gynecological origin.

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Introduction: Dyspepsia accounts for a significant burden of worldwide disease, but there is a relative paucity of data from the sub-Saharan African setting. We undertook to describe the burden, risk factors and severity of dyspepsia across Rwanda.

Methods: We performed a population-based clustered cross-sectional survey between November 2015 and January 2016, nationwide in Rwanda, using the Short Form Leeds Dyspepsia Questionnaire to describe the presence and severity of dyspepsia, and the Short Form Nepean Dyspepsia Index to describe the concomitant quality of life effects.

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Rationale: There are no population-based studies from sub-Saharan Africa describing longitudinal lung function in adults.

Objectives: To explore the lung function trajectories and their determinants, including the effects of air pollution exposures and the cleaner-burning biomass-fuelled cookstove intervention of the Cooking and Pneumonia Study (CAPS), in adults living in rural Malawi.

Methods: We assessed respiratory symptoms and exposures, spirometry and measured 48-hour personal exposure to fine particulate matter (PM) and carbon monoxide (CO), on three occasions over 3 years.

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Esophageal carcinoma causes over 380 000 deaths per year, ranking sixth worldwide in mortality amongst all malignancies. Globally, the squamous cell subtype is most common and accounts for 80% of esophageal cancers. Nonetheless, esophageal squamous cell carcinoma is much more poorly understood than esophageal adenocarcinoma, including what is driving such high prevalences, why it often presents in young patients, and shows such marked geographical delineations Areas covered: The current literature was searched for articles focusing on aetiopathogenesis of squamous cell esophageal carcinoma via a systematic review, particularly in low-resource settings.

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Background: Oesophageal squamous cell carcinoma (OSCC) is increasing worldwide and has an exceptionally high prevalence in certain distinct geographical locations such as the African oesophageal SCC corridor. Despite this, there is a paucity of evidence to characterise the disease particularly in the Malawian context.

Method: We retrospectively audited our endoscopy database over 5 years, including for patient demographics, endoscopy findings, therapeutic intervention and recommendations for treatment.

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Background: International partnerships in research are receiving ever greater attention, given that technology has diminished the restriction of geographical barriers with the effects of globalisation becoming more evident, and populations increasingly more mobile.

Discussion: In this article, we examine the merits and risks of such collaboration even when strict universal ethical guidelines are maintained. There has been widespread examples of outcomes beneficial and detrimental for both high and low -income countries which are often initially unintended.

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