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bone perfusion

Carolina Rodriguez-Tirado, Takanori Kitamura, Yu Kato, Jeffery W Pollard, John S Condeelis, David Entenberg
Metastasis to secondary sites such as the lung, liver and bone is a traumatic event with a mortality rate of approximately 90% (1). Of these sites, the lung is the most difficult to assess using intravital optical imaging due to its enclosed position within the body, delicate nature and vital role in sustaining proper physiology. While clinical modalities (positron emission tomography (PET), magnetic resonance imaging (MRI) and computed tomography (CT)) are capable of providing noninvasive images of this tissue, they lack the resolution necessary to visualize the earliest seeding events, with a single pixel consisting of nearly a thousand cells...
October 6, 2016: Journal of Visualized Experiments: JoVE
Nobuhiro Yada, Hideo Onishi, Masahiro Miyai, Kentarou Ozasa, Masuo Haramoto, Yasushi Yamamoto, Shuhei Yamaguchi, Hajime Kitagaki
PURPOSE: This study aimed to verify the resolution recovery for each collimator in the brain perfusion image. METHOD: To verify the effect of the resolution recovery for each collimator, we evaluated via the three-dimensional brain phantom (phantom) and the normal brain perfusion single photon emission computed tomography (SPECT) data. These data were reconstructed using the three-dimensional ordered subset expectation maximization method (3D-OSEM) (Evolution for bone(TM)) that was performed with scatter correction, attenuation correction, and resolution recovery (RR)...
2016: Nihon Hoshasen Gijutsu Gakkai Zasshi
Yuen Ting Lam, Laura Lecce, Joanne T M Tan, Christina A Bursill, David J Handelsman, Martin K C Ng
Increasing evidence indicates that androgens regulate ischemia-induced neovascularization. However, the role of genomic androgen action mediated by androgen receptor (AR), a ligand-activated nuclear transcription factor, remains poorly understood. Using an AR knockout mouse strain that contains a transcriptionally inactive AR (AR(Δex3)KO), we examined the role of AR genomic function in modulating androgen-mediated augmentation of ischemia-induced neovascularization. Castrated wildtype (AR(WT)) and AR(Δex3)KO mice were implanted with dihydrotestosterone (DHT) or placebo pellets following hindlimb ischemia (HLI)...
October 18, 2016: Endocrinology
Bruno Caldin da Silva, Adriano Sanjuan, Valéria Costa-Hong, Luciene Dos Reis, Fabiana Graciolli, Fernanda Consolim-Colombo, Luiz Aparecido Bortolotto, Rosa Maria Affonso Moyses, Rosilene Motta Elias
Introduction: Bone metabolism disorder (BMD) and vascular dysfunction contribute to excess cardiovascular mortality observed in hemodialysis patients. Vascular dysfunction, a new marker of atherosclerosis, can play a role in this risk. Even though associated with higher mortality in the general population, such vascular evaluation in patients on hemodialysis has not been extensively studied. Methods: In this cross-sectional study, hemodialysis patients were submitted to flow-mediated dilation, subendocardial viability ratio (SEVR) and ejection duration index assessment, in order to estimate the impact of BMD markers on vascular dysfunction...
July 2016: Jornal Brasileiro de Nefrologia: ʹorgão Oficial de Sociedades Brasileira e Latino-Americana de Nefrologia
Jolanda R Vetsch, Ralph Müller, Sandra Hofmann
Bone remodelling is the continuous turnover of bone by resorption and formation. It is controlled by interstitial fluid flow sensed by osteocytes. The refilling of bone resorption sites has been shown to be curvature driven. In vitro, curvature influences tissue growth and cytoskeletal arrangements under static and perfused conditions. Nevertheless, this has only been demonstrated for non-mineralized tissue in limited three-dimensional volumes. This study aims at investigating the influence of three different channel curvatures (S, -2...
October 2016: Journal of the Royal Society, Interface
Tao Yan, Poornima Venkat, Michael Chopp, Alex Zacharek, Ruizhuo Ning, Cynthia Roberts, Yi Zhang, Mei Lu, Jieli Chen
BACKGROUND AND PURPOSE: Comorbidity of diabetes mellitus and stroke results in worse functional outcome, poor long-term recovery, and extensive vascular damage. We investigated the neurorestorative effects and mechanisms of stroke treatment with human bone marrow-derived mesenchymal stromal cells (hMSCs) in type 2 diabetes mellitus (T2DM) rats. METHODS: Adult male Wistar rats were induced with T2DM, subjected to 2 hours of middle cerebral artery occlusion (MCAo) and treated via tail-vein injection with (1) PBS (n=8) and (2) hMSCs (n=10; 5×10(6)) at 3 days after MCAo...
October 11, 2016: Stroke; a Journal of Cerebral Circulation
Donghui Liu, Silvia Passos Andrade, Pollyana Ribeiro Castro, John Treacy, Jason Ashworth, Mark Slevin
Sodium butyrate (NaBu), a form of short-chain fatty acid (SCFA), acts classically as a potent anti-angiogenic agent in tumour angiogenesis models, some authors demonstrated that low concentrations of NaBu may contribute to healing of tendon-bone injury in part at least through promotion of tissue remodelling. Here, we investigated the effects of low-range concentrations of NaBu using in vitro and in vivo assays using angiogenesis as the primary outcome measure and the mechanisms through which it acts. We demonstrated that NaBu, alone or perfused from the UltraBraid+NaBu suture was pro-angiogenic at very low-range doses promoting migration, tube formation and cell invasion in bovine aortic endothelial cells (BAECs)...
October 3, 2016: Scientific Reports
M Stravinskas, P Horstmann, J Ferguson, W Hettwer, M Nilsson, S Tarasevicius, M M Petersen, M A McNally, L Lidgren
OBJECTIVES: Deep bone and joint infections (DBJI) are directly intertwined with health, demographic change towards an elderly population, and wellbeing.The elderly human population is more prone to acquire infections, and the consequences such as pain, reduced quality of life, morbidity, absence from work and premature retirement due to disability place significant burdens on already strained healthcare systems and societal budgets.DBJIs are less responsive to systemic antibiotics because of poor vascular perfusion in necrotic bone, large bone defects and persistent biofilm-based infection...
September 2016: Bone & Joint Research
Hidehiko Yoshimatsu, Takumi Yamamoto, Akitatsu Hayashi, Takuya Iida
BACKGROUND: Most authors elevate the superficial circumflex iliac artery perforator flap from the lateral edge of the skin paddle, and begin by dissecting a perforator perfusing the skin paddle. In this article, the authors introduce a modified technique for elevation of a superficial circumflex iliac artery perforator flap, beginning with identification of the pedicle arteries, allowing inclusion of a variety of anatomical structures. METHODS: From August of 2012 to August of 2015, 27 patients with soft- and bony-tissue defects underwent reconstruction using proximal-to-distally elevated superficial circumflex iliac artery perforator flaps...
October 2016: Plastic and Reconstructive Surgery
Nicolas Noiseux, Samer Mansour, Richard Weisel, Louis-Mathieu Stevens, Shant Der Sarkissian, Katherine Tsang, Andrew M Crean, Eric Larose, Shu-Hong Li, Bernd Wintersperger, Minh Quan Vu, Ignacio Prieto, Ren-Ke Li, Denis Claude Roy, Terrence M Yau
OBJECTIVES: The IMPACT-CABG trial is the first North American multicenter phase II randomized study of intramyocardial delivery of autologous CD133(+) stem cells in patients with chronic ischemic cardiomyopathy undergoing coronary artery bypass grafting. The primary objective was to demonstrate safety, including freedom from major adverse cardiac events. The secondary objective was to evaluate feasibility of same-day autologous cell preparation. Although the trial was not powered to evaluate LV function, exploratory data were collected...
August 13, 2016: Journal of Thoracic and Cardiovascular Surgery
Zhongjian Cheng, Venkata Garikipati, Emily Nickoloff, Chunlin Wang, David J Polhemus, Jibin Zhou, Cynthia Benedict, Mohsin Khan, Suresh K Verma, Joseph E Rabinowitz, David Lefer, Raj Kishore
BACKGROUND: -Bone marrow cell-based treatment for critical limb ischemia (CLI) in diabetic patients yielded a modest therapeutic effect due to cell dysfunction. Therefore, approaches that improve diabetic stem/progenitor cell functions may provide therapeutic benefits. Here, we tested the hypotheses that restoration of hydrogen sulfide (H2S) production in diabetic bone marrow cells (BMCs) improves their reparative capacities. METHODS: -Mouse BMCs were isolated by density-gradient centrifugation...
September 22, 2016: Circulation
T Kahl, F K Razny, J P Benter, K Mutig, K Hegenscheid, S Mutze, A Eisenschenk
The clinical relevance of scaphoid bone fractures is reflected by their high incidence, accounting for approximately 60 % among carpal fractures and for 2-3 % of all fractures. With adequate therapy most scaphoid bone fractures heal completely without complications. Insufficient immobilization or undiagnosed fractures increase the risk of nonunion and the development of pseudarthrosis.X-ray examination enables initial diagnosis of scaphoid fracture in 70-80 % of cases. Positive clinical symptoms by negative x‑ray results require further diagnostics by multi-slice spiral CT (MSCT) or MRI to exclude or confirm a fracture...
September 16, 2016: Der Orthopäde
Liping Wang, Tian-Zhi Guo, Tzuping Wei, Wen-Wu Li, Xiaoyou Shi, J David Clark, Wade S Kingery
BACKGROUND: Bisphosphonates are used to prevent the bone loss and fractures associated with osteoporosis, bone metastases, multiple myeloma, and osteogenesis deformans. Distal limb fractures cause regional bone loss with cutaneous inflammation and pain in the injured limb that can develop into complex regional pain syndrome (CRPS). Clinical trials have reported that antiresorptive bisphosphonates can prevent fracture-induced bone loss, inhibit serum inflammatory cytokine levels, and alleviate CRPS pain...
October 2016: Anesthesia and Analgesia
B Schacher, R Böttcher, A Vogel, A Asmus, S Kim, A Eisenschenk, F Eichenauer
BACKGROUND: Nonunion of the scaphoid as a result of proximal fractures, failed surgical reconstruction, and especially avascular fragment necrosis are possible indications of vascularized bone grafts. Various techniques of vascularized (pedicled and free) grafts have been described. Pedicled grafts from the direct vicinity of the wrist provide several benefits. Harvest-site morbidity is reduced and preserved graft perfusion, without the need for blood vessel anastomosis, may lead to an improved consolidation...
September 15, 2016: Der Orthopäde
Yuan Lin, Ehsan Samei
Dynamic perfusion imaging can provide the morphologic details of the scanned organs as well as the dynamic information of blood perfusion. However, due to the polyenergetic property of the x-ray spectra, beam hardening effect results in undesirable artifacts and inaccurate CT values. To address this problem, this study proposes a segmentation-free polyenergetic dynamic perfusion imaging algorithm (pDP) to provide superior perfusion imaging. Dynamic perfusion usually is composed of two phases, i.e., a precontrast phase and a postcontrast phase...
July 2016: Journal of Medical Imaging
Akihito Kato, Hiroyuki Morishima, Goro Nagashima
<i>Background</i>:Sinking skin flap syndrome(SSFS)manifests as subjective symptoms, such as headache, dizziness, and undue fatigability, in addition to neurologic symptoms, such as hemiplegia, aphasia, and perceived failure, when the skin over a bone defect sinks in the weeks or months following a decompressive craniectomy. Indeed, these symptoms can improve after a cranioplasty. <i>Case presentation</i>:A 58-year-old woman presented with a disturbance of consciousness. She was found to have a subarachnoid hemorrhage due to a ruptured right middle cerebral artery aneurysm...
September 2016: No Shinkei Geka. Neurological Surgery
Y Z Long, Z X Zhu, Y Yu, S M Zhang
Chronic osteomyelitis (COM) is an infectious disease caused by methicillin-resistant Staphylococcus aureus (MRSA), the main characteristics of COM including local dead bone formation, soft tissue infection, and repeatedly attacks. As a sensitive antibiotic, vancomycin plays an important role in the therapy of COM caused by MRSA. Currently, drug treatment is divided into systemic and topical, systemic medication is given priority to intravenous drug delivery; local drug application including local delivery device and local antibiotics lavage and regional arterial perfusion...
September 1, 2016: Zhonghua Wai Ke za Zhi [Chinese Journal of Surgery]
Michele Anzidei, Alessandro Napoli, Beatrice Sacconi, Fabrizio Boni, Vincenzo Noce, Michele Di Martino, Luca Saba, Carlo Catalano
PURPOSE: To assess the correlation between functional MRI, including ADC values obtained from DWI and DCE, and clinical outcome in patients with bone metastases treated with MRgFUS. METHODS AND MATERIALS: Twenty-three patients with symptomatic bone metastases underwent MRgFUS treatment (ExAblate 2100 system InSightec) for pain palliation. All patients underwent clinical and imaging follow-up examinations at 1, 3 and 6 months after treatment. Visual Analog Scale (VAS) score was used to evaluate treatment efficacy in terms of pain palliation while ADC maps obtained by DWI sequences, and DCE data were used for quantitative assessment of treatment response at imaging...
August 27, 2016: La Radiologia Medica
Sandra Boned, Marina Padroni, Marta Rubiera, Alejandro Tomasello, Pilar Coscojuela, Nicolás Romero, Marián Muchada, David Rodríguez-Luna, Alan Flores, Noelia Rodríguez, Jesús Juega, Jorge Pagola, José Alvarez-Sabin, Carlos A Molina, Marc Ribó
BACKGROUND: Identifying infarct core on admission is essential to establish the amount of salvageable tissue and indicate reperfusion therapies. Infarct core is established on CT perfusion (CTP) as the severely hypoperfused area, however the correlation between hypoperfusion and infarct core may be time-dependent as it is not a direct indicator of tissue damage. This study aims to characterize those cases in which the admission core lesion on CTP does not reflect an infarct on follow-up imaging...
August 26, 2016: Journal of Neurointerventional Surgery
Amanda R Jensen, Morenci M Manning, Sina Khaneki, Natalie A Drucker, Troy A Markel
BACKGROUND: Transplantation of mesenchymal stromal cells (MSCs) may be a novel treatment for intestinal ischemia. The optimal stromal cell source that could yield maximal protection after injury, however, has not been identified. We hypothesized that (1) MSCs would increase survival and mesenteric perfusion, preserve intestinal histologic architecture, and limit inflammation after intestinal ischemia and reperfusion (I/R) injury, and (2) MSCs harvested from different sources of tissue would have equivalent protective properties to the intestine after I/R inury...
August 2016: Journal of Surgical Research
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