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Intraluminal

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https://www.readbyqxmd.com/read/29781171/fiber-based-fluorescence-lifetime-imaging-of-recellularization-processes-on-vascular-tissue-constructs
#1
Alba Alfonso-Garcia, Jeny Shklover, Benjamin E Sherlock, Alyssa Panitch, Leigh G Griffiths, Laura Marcu
New techniques able to monitor the maturation of tissue engineered constructs over time are needed for a more efficient control of developmental parameters. Here, a label-free fluorescence lifetime imaging (FLIm) approach implemented through a single fiber-optic interface is reported for non-destructive in situ assessment of vascular biomaterials. Recellularization processes of antigen removed bovine pericardium scaffolds with endothelial cells and mesenchymal stem cells were evaluated on the serous and the fibrous sides of the scaffolds, two distinct extracellular matrix niches, over the course of a 7 day culture period...
May 21, 2018: Journal of Biophotonics
https://www.readbyqxmd.com/read/29779953/a-quality-assurance-device-for-measuring-afterloader-performance-and-transit-dose-for-nasobiliary-high-dose-rate-brachytherapy
#2
Christopher L Deufel, John P Mullins, Mark J Zakhary
PURPOSE: Nasobiliary high-dose-rate (HDR) brachytherapy has emerged as an effective tool to boost the radiation dose for patients with unresectable perihilar cholangiocarcinoma. This work describes a quality assurance (QA) tool for measuring the HDR afterloader's performance, including the transit dose, when the source wire travels through a tortuous nasobiliary catheter path. METHODS AND MATERIALS: The nasobiliary QA device was designed to mimic the anatomical path of a nasobiliary catheter, including the nasal, stomach, duodenum, and bile duct loops...
May 17, 2018: Brachytherapy
https://www.readbyqxmd.com/read/29776892/technique-for-the-administration-of-high-dose-rate-brachytherapy-to-the-bile-duct-using-a-nasobiliary-catheter
#3
Christopher L Deufel, Keith M Furutani, Robert A Dahl, Michael P Grams, Luke B McLemore, Christopher L Hallemeier, Michelle Neben-Wittich, James A Martenson, Michael G Haddock
PURPOSE: Cholangiocarcinoma patients who are potential candidates for liver transplantation may be treated with high-dose-rate (HDR) brachytherapy using a minimally invasive nasobiliary catheter in an effort to escalate the radiotherapy dose to the tumor and maximize local control rates. This work describes the equipment, procedures, and quality assurance (QA) that enables successful administration. METHODS AND MATERIALS: This work describes the nasobiliary catheter placement, simulation, treatment planning, treatment delivery, and QA...
May 16, 2018: Brachytherapy
https://www.readbyqxmd.com/read/29772327/creation-of-abdominal-aortic-aneurysms-in-sheep-by-extrapolation-of-rodent-models-is-it-feasible
#4
Peter Verbrugghe, Jelle Verhoeven, Marnick Clijsters, Dominique Vervoort, Walter Coudyzer, Eric Verbeken, Bart Meuris, Paul Herijgers
BACKGROUND: Aortic abdominal aneurysms are a potentially deathly disease, needing surgical or endovascular treatment. To evaluate potentially new diagnostic tools and treatments a large animal model, which not only resembles the morphological characteristics but also the pathophysiological background, would be useful. MATERIALS AND METHODS: Rodent animal aneurysm models were extrapolated to sheep. Four groups were created: intraluminal infusion with an elastase-collagenase solution (n=4), infusion with elastase-collagenase solution combined with proximal stenosis (n=7), aortic xenograft (n=3), and elastase-collagenase treated xenograft (n=4)...
May 14, 2018: Annals of Vascular Surgery
https://www.readbyqxmd.com/read/29769431/integrative-analysis-of-gut-microbiota-composition-host-colonic-gene-expression-and-intraluminal-metabolites-in-aging-c57bl-6j-mice
#5
Benthe van der Lugt, Fenni Rusli, Carolien Lute, Andreas Lamprakis, Ethel Salazar, Mark V Boekschoten, Guido J Hooiveld, Michael Müller, Jacques Vervoort, Sander Kersten, Clara Belzer, Dieuwertje E G Kok, Wilma T Steegenga
The aging process is associated with diminished colonic health. In this study, we applied an integrative approach to reveal potential interactions between determinants of colonic health in aging C57BL/6J mice. Analysis of gut microbiota composition revealed an enrichment of various potential pathobionts, including Desulfovibrio spp . , and a decline of the health-promoting Akkermansia spp . and Lactobacillus spp. during aging. Intraluminal concentrations of various metabolites varied between ages and we found evidence for an increased gut permeability at higher age...
May 16, 2018: Aging
https://www.readbyqxmd.com/read/29769187/intraoperative-intraluminal-injection-of-n-acetylcysteine-allowing-treatment-of-distal-intestinal-obstruction-syndrome-without-the-need-for-enterotomy
#6
Nicholas Js Chilvers, James Wheeler
We describe a case of an 18-year-old man who suffers from cystic fibrosis and developed distal intestinal obstruction syndrome while being treated as an inpatient. Following failed medical management, we proceeded to laparotomy where the small bowel was decompressed with retrograde milking into the stomach, leaving a section of impacted stool in the distal ileum. N-acetylcysteine was injected into the bowel lumen proximal to the obstruction. This resulted in dissolution of the stool without the need for enterotomy and is, to our knowledge, the first successful example of this technique in the literature...
May 16, 2018: BMJ Case Reports
https://www.readbyqxmd.com/read/29765392/carotid-stenting-for-treatment-of-symptomatic-carotid-webs-a-single-center-case-series
#7
Waleed Brinjikji, Ronit Agid, Vitor M Pereira
Background and Purpose: Carotid webs are an increasingly recognized cause of acute is-chemic stroke, particularly in younger adults. The optimal medical and surgical strategies for managing these lesions have not been well established. We report a single-center case series of carotid stenting for treatment of symptomatic carotid webs. Materials and Methods: Consecutive patients undergoing stent placement for treatment of symptomatic carotid webs were included. Carotid webs were defined as a thin intraluminal filling defect along the posterior wall of the carotid bulb just beyond the carotid bifurcation on CTA...
April 2018: Interventional Neurology
https://www.readbyqxmd.com/read/29764034/-application-of-low-profile-visualized-intraluminal-support-lvis-stents-in-assisting-coil-embolization-of-intracranial-aneurysms
#8
D C Xu, J Li, Z Q Jiang
Objective: To evaluate the safety and effectiveness of application of LVIS stent-assisted coiling endovascular procedures in cerebral aneurysms . Methods: The clinical data of 41 patients with intracranial aneurysms , which were performed in LVIS stent-assisted coiling endovascular therapies from June 2015 to October 2017 in The First Affiliated Hospital of Bengbu Medical College were analyzed retrospectively. 13 patients were unruptured and 28 patients were ruptured. Immediate angiography outcomes and follow-up angiography outcomes were assessed by DSA...
May 8, 2018: Zhonghua Yi Xue za Zhi [Chinese medical journal]
https://www.readbyqxmd.com/read/29764003/a-bioartificial-kidney-device-with-polarized-secretion-of-immune-modulators
#9
N V Chevtchik, M Mihajlovic, M Fedecostante, L Bolhuis-Versteeg, J Sastre Toraño, R Masereeuw, D Stamatialis
The accumulation of protein-bound toxins in dialyzed patients is strongly associated with their high morbidity and mortality. The bioartificial kidney device (BAK), containing proximal tubule epithelial cells (PTEC) seeded on functionalized synthetic hollow fiber membranes (HFM), may be a powerful solution for the active removal of those metabolites. In an earlier study, we developed an upscaled BAK containing conditionally immortalized human PTEC (ciPTEC) with functional organic cationic transporter 2 (OCT2)...
May 15, 2018: Journal of Tissue Engineering and Regenerative Medicine
https://www.readbyqxmd.com/read/29761870/intestinal-disposition-of-quercetin-and-its-phase-ii-metabolites-after-oral-administration-in-healthy-volunteers
#10
Clément Chalet, Jari Rubbens, Jan Tack, Guus S Duchateau, Patrick Augustijns
OBJECTIVES: Quercetin is one of the main dietary flavonoids and undergoes a substantial intestinal phase-II metabolism. Quercetin conjugates have been detected in plasma and in urine, but their presence in the small intestine has not been assessed. This study aimed to investigate the intestinal metabolism and metabolite excretion of quercetin by the human small intestinal wall after oral dosing. METHODS: Six healthy volunteers were given a capsule of 500 mg of quercetin with 240 ml of water...
May 15, 2018: Journal of Pharmacy and Pharmacology
https://www.readbyqxmd.com/read/29760544/ischemia-reperfusion-injury-in-porcine-intestine-viability-assessment
#11
Runar J Strand-Amundsen, Henrik M Reims, Finn P Reinholt, Tom E Ruud, Runkuan Yang, Jan O Høgetveit, Tor I Tønnessen
AIM: To investigate viability assessment of segmental small bowel ischemia/reperfusion in a porcine model. METHODS: In 15 pigs, five or six 30-cm segments of jejunum were simultaneously made ischemic by clamping the mesenteric arteries and veins for 1 to 16 h. Reperfusion was initiated after different intervals of ischemia (1-8 h) and subsequently monitored for 5-15 h. The intestinal segments were regularly photographed and assessed visually and by palpation. Intraluminal lactate and glycerol concentrations were measured by microdialysis, and samples were collected for light microscopy and transmission electron microscopy...
May 14, 2018: World Journal of Gastroenterology: WJG
https://www.readbyqxmd.com/read/29757356/developing-a-diagnostic-understanding-of-gerd-phenotypes-through-the-analysis-of-levels-of-mucosal-injury-immune-activation-and-psychological-comorbidity
#12
C Zhong, K Liu, K Wang, H Liu, H Su, J Wu, L Duan
Patients with gastroesophageal reflux disease (GERD) can present with typical or atypical symptoms. The aim of this study is to explore the underlying physiological and psychological mechanisms that lead to different symptomatic manifestations of GERD. A total of 238 patients diagnosed with GERD underwent gastroscopy, 24 h multichannel intraluminal impedance-pH (MII-pH) monitoring, and psychological assessment with questionnaires. Patient symptoms were used to classify GERD into phenotypes of typical reflux syndrome (TRS, n = 87), reflux chest pain syndrome (RCS, n = 98), and extraesophageal syndromes (EES, n = 53)...
May 10, 2018: Diseases of the Esophagus: Official Journal of the International Society for Diseases of the Esophagus
https://www.readbyqxmd.com/read/29757220/annexins-coordinators-of-cholesterol-homeostasis-in-endocytic-pathways
#13
REVIEW
Carles Rentero, Patricia Blanco-Muñoz, Elsa Meneses-Salas, Thomas Grewal, Carlos Enrich
The spatiotemporal regulation of calcium (Ca2+ ) storage in late endosomes (LE) and lysosomes (Lys) is increasingly recognized to influence a variety of membrane trafficking events, including endocytosis, exocytosis, and autophagy. Alterations in Ca2+ homeostasis within the LE/Lys compartment are implicated in human diseases, ranging from lysosomal storage diseases (LSDs) to neurodegeneration and cancer, and they correlate with changes in the membrane binding behaviour of Ca2+ -binding proteins. This also includes Annexins (AnxA), which is a family of Ca2+ -binding proteins participating in membrane traffic and tethering, microdomain organization, cytoskeleton interactions, Ca2+ signalling, and LE/Lys positioning...
May 12, 2018: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/29756401/alpha-1-adrenergic-stimulation-selectively-enhances-endothelium-mediated-vasodilation-in-rat-cremaster-arteries
#14
Ramesh C Mishra, Mohammad M Rahman, Michael J Davis, Heike Wulff, Michael A Hill, Andrew P Braun
We have systematically investigated how vascular smooth muscle α1 -adrenoceptor activation impacts endothelium-mediated vasodilation in isolated, myogenically active, rat cremaster muscle 1A arteries. Cannulated cremaster arteries were pressurized intraluminally to 70 mmHg to induce myogenic tone, and exposed to vasoactive agents via bath superfusion at 34°C. Smooth muscle membrane potential was measured via sharp microelectrode recordings in pressurized, myogenic arteries. The α1 -adrenergic agonist phenylephrine (25-100 nmol/L) produced further constriction of myogenic arteries, but did not alter the vasorelaxant responses to acetylcholine (0...
May 2018: Physiological Reports
https://www.readbyqxmd.com/read/29755896/bouveret-s-syndrome-literature-review
#15
REVIEW
Fady G Haddad, Wissam Mansour, Liliane Deeb
It was in 1896 that Bouveret's syndrome acquired its name after the French physician Leon Bouveret, who published two case reports in Revue de Medecin. Bouveret's syndrome describes gastric outlet obstruction secondary to an impacted gallstone. The gallstone reaches the small bowel through a bilioenteric fistula as a consequence of chronic inflammation and adherence between the biliary system and the bowels which increase the intraluminal pressure and leads to secondary wall ischemia and wall perforation with gallstone passage into the bowel...
March 10, 2018: Curēus
https://www.readbyqxmd.com/read/29755780/appendiceal-diverticulosis-a-harbinger-of-underlying-primary-appendiceal-adenocarcinoma
#16
Jia Lin Ng, Shing Lih Wong, Ronnie Mathew
Diagnosis of primary appendiceal adenocarcinoma (PAA) is hindered by its rarity and largely asymptomatic nature. Appendiceal diverticulosis (AD) is equally rare. We report an unusual case of PAA presenting with perforated appendiceal diverticulitis, and discuss a review of the literature about its association, and its surgical and pathological implications. A middle-aged man was admitted with right iliac fossa (RIF) pain and a corresponding tender abdominal mass for 5 days. Computerised tomography (CT) scan demonstrated a thickened appendix with 3 cm abscess at its base...
April 2018: Journal of Gastrointestinal Oncology
https://www.readbyqxmd.com/read/29754740/detection-of-endometrial-cancer-cells-in-the-fallopian-tube-lumen-is-associated-with-adverse-prognostic-factors-and-reduced-survival
#17
Ashley S Felix, Jennifer A Sinnott, Monica Hagan Vetter, Jennifer Rhoades, David E Cohn, Floor J Backes, Mark E Sherman, Adrian A Suarez
OBJECTIVE: Stage is a critical determinant of prognosis and treatment for endometrial cancer (EC) patients. Women who have had a tubal ligation for sterilization have improved EC survival, secondary to lower stage at presentation, suggesting that transtubal spread may represent an important route of metastasis. We evaluated detection of intraluminal tumor cells (ILTCs) in relation to tumor characteristics and survival. METHODS: One pathologist retrospectively evaluated hematoxylin and eosin sections of routinely collected fallopian tubes for ILTCs from 295 EC patients, masked to outcome...
May 10, 2018: Gynecologic Oncology
https://www.readbyqxmd.com/read/29753043/ska-31-an-activator-of-endothelial-ca-2-activated-k-channels-evokes-robust-vasodilation-in-rat-mesenteric-arteries
#18
Rayan Khaddaj-Mallat, Cini Mathew John, Andrew P Braun
It is now well recognized that endothelial KCa2.3 and KCa3.1 channel activities contribute to dilation of resistance arteries via endothelium-mediated hyperpolarization and vascular smooth muscle relaxation. In this study, we have investigated the functional effect of the KCa channel activator SKA-31 in third order rat mesenteric arteries using arterial pressure myography. Isolated arteries were cannulated, pressurized intraluminally to 70mmHg at 36°C and then constricted with 1μM phenylephrine. Acute bath exposure to SKA-31 evoked a robust and reversible inhibition of developed tone (IC50 = 0...
May 9, 2018: European Journal of Pharmacology
https://www.readbyqxmd.com/read/29748084/malignant-obstructive-jaundice-treated-with-intraluminal-placement-of-iodine-125-seed-strands-and-metal-stents-an-analysis-of-long-term-outcomes-and-prognostic-features
#19
Jingqin Ma, Jianjun Luo, Junying Gu, Qingxin Liu, Lingxiao Liu, Wen Zhang, Zihan Zhang, Zhiping Yan
PURPOSE: The purpose of this study was to analyze the long-term outcomes, including safety, efficacy, and prognostic features, of intraluminal brachytherapy with Iodine-125 (125 I) seed strand and stent placement for treatment of patients with malignant obstructive jaundice (MOJ). METHODS AND MATERIALS: From January 2009 to December 2013, 107 consecutive patients with MOJ were treated with intraluminal placement of 125 I seed strands and metal stents. A retrospective evaluation of therapeutic outcomes, including overall survival (OS), stent patency rate, complications, and prognostic features, was conducted in 101 patients...
May 7, 2018: Brachytherapy
https://www.readbyqxmd.com/read/29747811/ganglioside-metabolism-in-health-and-disease
#20
Roger Sandhoff, Heike Schulze, Konrad Sandhoff
Gangliosides (GGs) are cell type-specific sialic acid-containing glycosphingolipids (GSLs), which are enriched in mammalian brain. Defects in GSL metabolism cause fatal human diseases. GSLs are composed of a hydrophilic oligosaccharide linked in 1-O-position to a hydrophobic ceramide anchor, which itself is composed of a long-chain amino alcohol, the sphingoid base, and an amide-bound acyl chain. Biosynthesis of mammalian GGs and other GSLs starts with the formation of their hydrophobic ceramide anchor in the endoplasmic reticulum, followed by sequential glycosylation reactions along the secretory pathway, mainly at the luminal surface of Golgi and trans-Golgi network (TGN) membranes...
2018: Progress in Molecular Biology and Translational Science
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