Publications by authors named "Arnelo U"

Background: The optimal timing of surgery for acute cholecystitis has been a subject of debate, but the predominant view supports early cholecystectomy. This study investigated the safety of early cholecystectomy during weekends compared with delayed surgery until a weekday.

Methods: This was a population-based cohort study based on data from the Swedish National Register for Gallstone Surgery and Endoscopic Retrograde Cholangiopancreatography (GallRiks).

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Objective: Ampullary neoplastic lesions can be resected by endoscopic papillectomy (EP) or transduodenal surgical ampullectomy (TSA) while pancreaticoduodenectomy is reserved for more advanced lesions. We present the largest retrospective comparative study analysing EP and TSA.

Design: Of all patients in the database, lesions with prior interventions, benign histology advanced malignancy (T2 and more), patients with hereditary syndromes and those undergoing pancreatoduodenectomy were excluded.

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Intraductal papillary mucinous neoplasms (IPMNs) display four histological subtypes: gastric foveolar, pancreaticobiliary, intestinal, and oncocytic. All of these subtypes harbor a different risk of cancer development. The clinical impact of these subtypes concerning the occurrence of high-grade dysplasia (HGD)/cancer (C) in specific morphological types, such as branch-duct (BD), main-duct (MD), and mixed-type (MT) IPMNs, has been less investigated.

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Article Synopsis
  • The study analyzed data from over 74,000 ERCP procedures to identify factors that impact the duration of the procedure and created an estimation tool called SWEET.
  • Key influencers on ERCP time included specific conditions like primary sclerosing cholangitis, certain anatomical features, and procedural steps such as lithotripsy and dilation.
  • The SWEET tool, validated with a large external dataset, accurately predicts ERCP time, improving scheduling efficiency in clinical settings by averaging a 17.5-minute difference between actual and predicted durations.
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Background: Biliary tract cancer (BTC) often goes undetected until its advanced stages, resulting in a poor prognosis. Given the anatomical closeness of the gallbladder and bile ducts to the pancreas, the inflammatory processes triggered by acute pancreatitis might increase the risk of BTC.

Objective: To assess the association between acute pancreatitis and the risk of BTC.

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The pancreas has two main functions: to produce and secrete digestive enzymes (exocrine function) and to produce hormones that regulate blood glucose and splanchnic secretion (endocrine function). The endocrine and exocrine portions of the pancreas are central regulators in digestion and metabolism, with continuous crosstalk between their deeply interconnected components, which plays a role in disease. Pancreatic neoplasms, inflammation, trauma, and surgery can lead to the development of type 3c diabetes when an insult simultaneously damages both acini and islets, leading to exocrine and endocrine dysfunction.

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Background And Aims: Chronic pancreatitis may cause intractable abdominal pain, with total pancreatectomy sometimes being the last resort. To mitigate the subsequent diabetes, total pancreatectomy can be followed by islet autotransplantation (TP-IAT). The primary aim of this study was to assess the outcomes in patients undergoing TP-IAT at Karolinska University Hospital with respect to safety, postoperative complications, and islet graft function.

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Pancreatic cancer is a highly lethal disease with a rising incidence. It is projected to become the second-leading cause of cancer-related mortality by 2030. The staging of pancreatic cancer can be broadly categorized into three groups: resectable cancers, locally advanced or borderline resectable cancers, and metastatic cancers.

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Article Synopsis
  • Intraductal papillary mucinous neoplasm (IPMN) often necessitates surgical removal, but there’s debate over how much of the pancreas should be taken when the main duct is dilated.
  • Intraoperative pancreatoscopy, a technique introduced recently in robotic surgeries, helps determine how much of the IPMN to remove during operations like robotic pancreatoduodenectomy and distal pancreatectomy.
  • A study involving 28 pancreatoscopies during robotic surgeries showed no complications and minimal extra time for the procedure, with all patients recovering well and being discharged shortly after surgery.
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Background: Trauma to the pancreas is rare but associated with significant morbidity. Currently available management guidelines are based on low-quality evidence and data on long-term outcomes is lacking. This study aimed to evaluate clinical characteristics and patient-reported long-term outcomes for pancreatic injury.

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  • Intraoperative pancreatoscopy is a new method that helps doctors during surgery to check for certain types of pancreatic tumors called IPMNs.
  • The study looked at 46 patients, and the procedure helped doctors make better decisions in 65% of the cases, sometimes leading to more surgery needed to remove dangerous growths.
  • Combining this method with another analysis showed a high chance of correctly identifying problematic tissue, making the procedure safe and useful for patients.
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Background: Predicting Post-Endoscopic Retrograde Cholangiopancreatography (ERCP) pancreatitis (PEP) risk can be determinant in reducing its incidence and managing patients appropriately, however studies conducted thus far have identified single-risk factors with standard statistical approaches and limited accuracy.

Aim: To build and evaluate performances of machine learning (ML) models to predict PEP probability and identify relevant features.

Methods: A proof-of-concept study was performed on ML application on an international, multicenter, prospective cohort of ERCP patients.

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Purpose: The Swedish Pancreatitis Cohort (SwePan) was designed to study long-term outcomes following an episode of acute pancreatitis. It can also be used to study various risk factors for developing acute pancreatitis.

Participants: The SwePan is a register-based nationwide matched cohort.

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Background: Chemoprevention's ability to slow down or prevent the progression of BD-IPMNs is extremely appealing. Aspirin (ASA), Ace Inhibitors/Angiotensin Receptor Blockers (ACEIs/ARBs) and Statins (STATs) are frequently prescribed drugs with a possible beneficial effect on different cancer types. Their effect on IPMNs is largely unknown.

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Background: Distinguishing intraductal papillary mucinous neoplasms (IPMNs) from other pancreatic cystic lesions is essential since IPMNs carry the risk of becoming malignant. Differentiating the main pancreatic duct involving IPMNs (MD-IPMNs) through conventional imaging is deficient. Single-operator peroral pancreatoscopy (SOPP) represents a promising method offering additional information on suspected lesions in the pancreatic main duct (MD).

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Background: Few studies compared lumen-apposing metal stents (LAMS) and standard double pigtail plastic stents (PS) for the endoscopic drainage of pancreatic walled-off necrosis (WON). Albeit sometimes large, previously described cohorts display considerable heterogeneity and often pooled together data from several centers, involving multiple operators and techniques. Moreover, they often lack a control group for the comparison of outcomes.

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Background: Teleguidance, a promising telemedicine service for intraoperative surgical consultation, was planned to scale up at a major academic hospital in partnership with 5 other hospitals. If the service was adopted and used over time, it was expected to provide educational benefits and improve clinical outcomes during endoscopic retrograde cholangiopancreatography (ERCP), which is a technically advanced procedure for biliary and pancreatic disease. However, it is known that seemingly successful innovations can play out differently in new settings, which might cause variability in clinical outcomes.

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Article Synopsis
  • Emerging research highlights the potential link between the gut microbiome and pancreatic cancer, but growing the cancer-associated microbiome is challenging.
  • A pilot study cultivated microbiomes from pancreatic cystic lesions, with successful cultures primarily found in intraductal papillary mucinous neoplasm (IPMN) lesions.
  • Analysis revealed that certain bacteria, especially Gammaproteobacteria, showed pathogenic traits in pancreatic cell lines, suggesting they may contribute to cancer development through mechanisms like DNA damage.
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  • The study investigates the differences in clinicopathology and overall survival (OS) between intraductal papillary mucinous neoplasm (inv-IPMN) and conventional pancreatic ductal adenocarcinoma (PDAC), analyzing data from patients treated at Karolinska University Hospital from 2009 to 2018.
  • Results show that the rate of resections for inv-IPMN increased significantly, along with improvements in two-year OS for both tumor types during the study period.
  • Although inv-IPMN appeared to have a better median OS (33.6 months) compared to PDAC (19.3 months), after adjusting for variables affecting death rates, the survival advantage for inv-IPMN disappeared, highlighting the importance of
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The European Society of Gastrointestinal Endoscopy (ESGE) has recognized the need to formalize and enhance training in endoscopic retrograde cholangiopancreatography (ERCP) and endoscopic ultrasound (EUS). This manuscript represents the outcome of a formal Delphi process resulting in an official Position Statement of the ESGE and provides a framework to develop and maintain skills in ERCP and EUS. This curriculum is set out in terms of the prerequisites prior to training; recommended steps of training to a defined syllabus; the quality of training; and how competence should be defined and evidenced before independent practice.

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Article Synopsis
  • The human biliary system, crucial for connecting the liver and intestine, is often affected by severe inflammatory and malignant diseases and represents a largely unstudied area in immunology.
  • A recent study conducted high-dimensional analyses of bile samples from patients with primary sclerosing cholangitis (PSC), revealing significant differences in the immune cell composition between bile ducts and blood.
  • Findings indicated that patients with PSC showed high levels of neutrophils and T cells in the bile, with specific immune characteristics that suggest a unique immune network, paving the way for future research on biliary disorders.
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Background: A telemedicine service enabling remote surgical consultation had shown promising results. When the service was to be scaled up, it was unclear how contextual variations among different clinical sites could affect the clinical outcomes and implementation of the service. It is generally recognized that contextual factors and work system complexities affect the implementation and outcomes of telemedicine.

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Background/aims: Many unanswered questions remain about the treatment of malignant hilar obstruction. We investigated endoscopic stenting for malignant biliary strictures, as reported in a nationwide registry.

Methods: All endoscopic retrograde cholangiopancreatography (ERCP) procedures entered in the Swedish Registry of Gallstone Surgery and ERCP from January 2010 to December 2017 in which stenting was performed for malignant biliary stricture management were included in this study.

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Background: Adenomatous neoplasia in the papilla of Vater needs to be resected in order not to progress. It can be challenging to distinguish between early ampullary malignant lesions and non-invasive adenomas, due to the overlap in symptoms and radiological findings. This retrospective study describes the different findings and treatment decisions taken prior to endoscopic and/or surgical resection of ampullary adenomatous lesions.

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