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28 febrero 2017

WORLD JOURNAL OF GASTROENTEROLOGY. Pediatric gastrointestinal bleeding: Perspectives from the Italian Society of Pediatric Gastroenterology

Claudio Romano, Salvatore Oliva, Stefano Martellossi, Erasmo Miele, Serena Arrigo, Maria Giovanna Graziani, Sabrina Cardile, Federica Gaiani, Gian Luigi de’Angelis, Filippo Torroni

There are many causes of gastrointestinal bleeding (GIB) in children, and this condition is not rare, having a reported incidence of 6.4%. Causes vary with age, but show considerable overlap; moreover, while many of the causes in the pediatric population are similar to those in adults, some lesions are unique to children. The diagnostic approach for pediatric GIB includes definition of the etiology, localization of the bleeding site and determination of the severity of bleeding; timely and accurate diagnosis is necessary to reduce morbidity and mortality. To assist medical care providers in the evaluation and management of children with GIB, the “Gastro-Ped Bleed Team” of the Italian Society of Pediatric Gastroenterology, Hepatology and Nutrition (SIGENP) carried out a systematic search on MEDLINE via PubMed (http://www.ncbi.nlm.nih.gov/pubmed/ ) to identify all articles published in English from January 1990 to 2016; the following key words were used to conduct the electronic search: “upper GIB” and “pediatric” [all fields]; “lower GIB” and “pediatric” [all fields]; “obscure GIB” and “pediatric” [all fields]; “GIB” and “endoscopy” [all fields]; “GIB” and “therapy” [all fields]. The identified publications included articles describing randomized controlled trials, reviews, case reports, cohort studies, case-control studies and observational studies. References from the pertinent articles were also reviewed. This paper expresses a position statement of SIGENP that can have an immediate impact on clinical practice and for which sufficient evidence is not available in literature. The experts participating in this effort were selected according to their expertise and professional qualifications.

14 marzo 2017

WORLD JOURNAL OF GASTROENTEROLOGY. Portal hypertension: Imaging of portosystemic collateral pathways and associated image-guided therapy

Murad Feroz Bandali, Anirudh Mirakhur, Edward Wolfgang Lee, Mollie Clarke Ferris, David James Sadler, Robin Ritchie Gray, Jason Kam Wong

Portal hypertension is a common clinical syndrome, defined by a pathologic increase in the portal venous pressure. Increased resistance to portal blood flow, the primary factor in the pathophysiology of portal hypertension, is in part due to morphological changes occurring in chronic liver diseases. This results in rerouting of blood flow away from the liver through collateral pathways to low-pressure systemic veins. Through a variety of computed tomographic, sonographic, magnetic resonance imaging and angiographic examples, this article discusses the appearances and prevalence of both common and less common portosystemic collateral channels in the thorax and abdomen. A brief overview of established interventional radiologic techniques for treatment of portal hypertension will also be provided. Awareness of the various imaging manifestations of portal hypertension can be helpful for assessing overall prognosis and planning proper management.

21 marzo 2017

WORLD JOURNAL OF GASTROENTEROLOGY. Clinical translation of bioartificial liver support systems with human pluripotent stem cell-derived hepatic cells

Ryoichi Sakiyama, Brandon J Blau, Toshio Miki

There is currently a pressing need for alternative therapies to liver transplantation. The number of patients waiting for a liver transplant is substantially higher than the number of transplantable donor livers, resulting in a long waiting time and a high waiting list mortality. An extracorporeal liver support system is one possible approach to overcome this problem. However, the ideal cell source for developing bioartificial liver (BAL) support systems has yet to be determined. Recent advancements in stem cell technology allow researchers to generate highly functional hepatocyte-like cells from human pluripotent stem cells (hPSCs). In this mini-review, we summarize previous clinical trials with different BAL systems, and discuss advantages of and potential obstacles to utilizing hPSC-derived hepatic cells in clinical-scale BAL systems.

21 marzo 2017

WORLD JOURNAL OF GASTROENTEROLOGY. Gastrointestinal bleeding in patients on novel oral anticoagulants: Risk, prevention and management

Ka-Shing Cheung, Wai K Leung

Novel oral anticoagulants (NOACs), which include direct thrombin inhibitor (dabigatran) and direct factor Xa inhibitors (rivaroxaban, apixaban and edoxaban), are gaining popularity in the prevention of embolic stroke in non-valvular atrial fibrillation as well as in the prevention and treatment of venous thromboembolism. However, similar to traditional anticoagulants, NOACs have the side effects of bleeding, including gastrointestinal bleeding (GIB). Results from both randomized clinical trials and observations studies suggest that high-dose dabigatran (150 mg b.i.d), rivaroxaban and high-dose edoxaban (60 mg daily) are associated with a higher risk of GIB compared with warfarin. Other risk factors of NOAC-related GIB include concomitant use of ulcerogenic agents, older age, renal impairment, Helicobacter pylori infection and a past history of GIB. Prevention of NOAC-related GIB includes proper patient selection, using a lower dose of certain NOACs and in patients with renal impairment, correction of modifiable risk factors, and prescription of gastroprotective agents. Overt GIB can be managed by withholding NOACs followed by delayed endoscopic treatment. In severe bleeding, additional measures include administration of activated charcoal, use of specific reversal agents such as idarucizumab for dabigatran and andexanent alfa for factor Xa inhibitors, and urgent endoscopic management.

28 febrero 2017

WORLD JOURNAL OF RADIOLOGY. Potential role of imaging in assessing harmful effects on spermatogenesis in adult testes with varicocele

Athina C Tsili, Olga N Xiropotamou, Anastasios Sylakos, Vasilios Maliakas, Nikolaos Sofikitis, Maria I Argyropoulou

Varicocele is characterized by an abnormal dilatation and retrograde blood flow in the spermatic veins. Varicocele is the leading correctable cause of male infertility. Although it is highly prevalent in infertile men, it is also observed in individuals with normal fertility. Determining which men are negatively affected by varicocele would enable clinicians to better select those men who will benefit from treatment. To assess the functional status of the testes in men with varicocele, color Doppler sonographic parameters were evaluated. Testicular arterial blood flow was significantly reduced in men with varicocele, reflecting an impairment of spermatogenesis. An improvement in the testicular blood supply was found after varicocelectomy on spectral Doppler analysis. Testicular contrast harmonic imaging and elastography might improve our knowledge about the influence of varicocele on intratesticular microcirculation and tissue stiffness, respectively, providing possible information on the early damage of testicular structure by varicocele. Magnetic resonance imaging (MRI), with measurement of apparent diffusion coefficient has been used to assess the degree of testicular dysfunction and to evaluate the effectiveness of varicocele repair. Large prospective studies are needed to validate the possible role of functional sonography and MRI in the assessment of early defects of spermatogenesis in testes with varicocele.

01 marzo 2017

CARDIOVASCULAR AND INTERVENTIONAL RADIOLOGY. Real-Time Patient and Staff Radiation Dose Monitoring in IR Practice

Anna M. Sailer, Leonie Paulis, Laura Vergoossen, Axel O. Kovac, Geert Wijnhoven, Geert Willem H. Schurink, Barend Mees, Marco Das, Joachim E. Wildberger, Michiel W. de Haan, Cécile R. L. P. N. Jeukens

Purpose: Knowledge of medical radiation exposure permits application of radiation protection principles. In our center, the first dedicated real-time, automated patient and staff dose monitoring system (DoseWise Portal, Philips Healthcare) was installed. Aim of this study was to obtain insight in the procedural and occupational doses.

01 marzo 2017

CARDIOVASCULAR AND INTERVENTIONAL RADIOLOGY. Closure Devices for Iatrogenic Thoraco-Cervical Vascular Injuries

Gregory C. Makris, Rafiuddin Patel, Mark Little, Carina Tyrrell, James Sutcliffe, Kader Allouni, Mark Bratby, Susan Anthony, Raman Uberoi

The unintentional arterial placement of a central venous line can have catastrophic complications. The purpose of this systematic review is to assess and analyse the available evidence regarding the use of the various vascular closure devices (VCDs) for the management of iatrogenic thoraco-cervical arterial injuries (ITCAI).

01 marzo 2017

CARDIOVASCULAR AND INTERVENTIONAL RADIOLOGY. Peripheral Stent Thrombosis Leading to Acute Limb Ischemia and Major Amputation: Incidence and Risk Factors in the Aortoiliac and Femoropopliteal Arteries

Konstantinos Katsanos, Said A. M. Al-Lamki, Aneeta Parthipun, Stavros Spiliopoulos, Sanjay Dhanji PatelIoannis Paraskevopoulos, Hany Zayed, Athanasios Diamantopoulos

Purpose: To report the real-world incidence and risk factors of stent thrombosis in the aortoiliac and femoropopliteal arteries in case of bare nitinol stent (BNS) or covered nitinol stent (CNS) placement from a single-centre retrospective audit.

01 enero 2017

AMERICAN JOURNAL OF ROENTGENOLOGY. The Emerging Role of MRI in Prostate Cancer Active Surveillance and Ongoing Challenges

Tristan Barrett and Masoom A. Haider

OBJECTIVE. Active surveillance (AS) has emerged as a management strategy for preventing overtreatment of indolent prostate cancer. Selection of patients for AS has traditionally proved challenging and resulted in 20–30% misclassification rates. MRI has potential to help overcome this limitation, broaden selection criteria to increase recruitment, and minimize the invasive nature of AS follow-up.

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