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https://www.readbyqxmd.com/read/28227429/characterization-of-normal-and-scarred-myocardium-based-on-texture-analysis-of-cardiac-computed-tomography-images
#1
S Antunes, A Esposito, A Palmisanov, C Colantoni, F de Cobelli, A Del Maschio, S Antunes, A Esposito, A Palmisanov, C Colantoni, F de Cobelli, A Del Maschio, A Del Maschio, C Colantoni, F De Cobelli, A Esposito, S Antunes
An accurate detection of myocardial scar using Cardiac CT may have a strong clinical impact; however, the main drawback is the insufficient contrast to noise ratio of delayed iodine enhanced (DIE) CT images, which makes its accurate segmentation (manual as well as automatic) difficult. In this work, we investigate texture parameters applied on the different scans in order to obtain the scans and features that best differentiates normal from scarred myocardium. The experiments on 7 cases of myocarditis show the accuracy of the parameter energy in all scans, as well as the good performance of the angiographic scan (having higher spatial resolution) with different parameters for the segmentation propose...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28227423/dynamic-mapping-of-ventricular-function-from-cardiovascular-magnetic-resonance-imaging
#2
Maria Panayiotou, Peter Mountney, Alexander Brost, Daniel Toth, Tom Jackson, Jonathan M Behar, Christopher A Rinaldi, R James Housden, Kawal S Rhode, Maria Panayiotou, Peter Mountney, Alexander Brost, Daniel Toth, Tom Jackson, Jonathan M Behar, Christopher A Rinaldi, R James Housden, Kawal S Rhode, Alexander Brost, Tom Jackson, Maria Panayiotou, Christopher A Rinaldi, Jonathan M Behar, R James Housden, Kawal S Rhode, Daniel Toth, Peter Mountney
Heart failure is associated with substantial mortality and morbidity and remains the most common diagnosis in older patients. Based on experimental electrophysiologic studies, cardiac resynchronization therapy (CRT) for heart failure results in a maximum resynchronization effect when applied to the most delayed left ventricular (LV) site. Current clinical practice is to identify the optimal site using separate visualisation of scar and activation information. These must be mentally mapped into 3D, which is challenging and time-consuming for the electrophysiologist...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28227097/effects-of-geometry-and-material-on-the-insertion-of-very-small-neural-electrode
#3
Shaun P Marshall, Wei-Chen Lin, Paras R Patel, Albert J Shih, Cynthia A Chestek, Shaun P Marshall, Wei-Chen Lin, Paras R Patel, Albert J Shih, Cynthia A Chestek, Wei-Chen Lin, Shaun P Marshall, Cynthia A Chestek, Albert J Shih, Paras R Patel
For neural probes to be used chronically for years in the human body, they must provoke minimal scarring. Recently, a number of groups have reported substantially reduced scar tissue using cellular scale electrodes below 15 μm in size. This size scale is accessible to manufacturing techniques, but can be very difficult to insert in the brain for most common electrode materials. In this study, we explore the design space available to cellular scale electrodes that will self-insert into the brain. First a mathematical model is developed using beam buckling equations for different materials and geometries...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28226865/electrical-resistance-increases-at-the-tissue-electrode-interface-as-an-early-response-to-nucleus-accumbens-deep-brain-stimulation
#4
Rajas P Kale, Abbas Z Kouzani, Julian Berk, Ken Walder, Michael Berk, Susannah J Tye, Rajas P Kale, Abbas Z Kouzani, Julian Berk, Ken Walder, Michael Berk, Susannah J Tye, Julian Berk, Michael Berk, Susannah J Tye, Abbas Z Kouzani, Rajas P Kale, Ken Walder
The therapeutic actions of deep brain stimulation are not fully understood. The early inflammatory response of electrode implantation is associated with symptom relief without electrical stimulation, but is negated by anti-inflammatory drugs. Early excitotoxic necrosis and subsequent glial scarring modulate the conductivity of the tissue-electrode interface, which can provide some detail into the inflammatory response of individual patients. The feasibility of this was demonstrated by measuring resistance values across a bipolar electrode which was unilaterally implanted into the nucleus accumbens of a rat while receiving continuous deep brain stimulation with a portable back-mounted device using clinical parameters (130Hz, 200μA, 90μs) for 3 days...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28226377/applying-a-visual-assessment-tool-to-facial-linear-scars
#5
Lindsey K Collins, Thomas J Knackstedt, Pamela Ganger, Emily Scherer, Faramarz H Samie
Previous scar scales have focused on verbal descriptions. A nonverbal visual assessment tool would provide a simple way for patients and physicians to quantify scar appearance. The authors sought to use a validated visual assessment tool for linear surgical scars to assess linear scars on the face and to determine whether patients and surgeons rate scars similarly. A total of 143 patients with linear facial scars resulting from repair of Mohs micrographic surgery defects used the visual assessment tool to rate their surgical scar...
February 2017: Facial Plastic Surgery: FPS
https://www.readbyqxmd.com/read/28226374/adjuncts-to-improve-nasal-reconstruction-results
#6
Shayna Lee Gordon, Eva A Hurst
The final cosmetic appearance of nasal reconstruction scars is of paramount importance to both the patient and surgeon. Ideal postreconstruction nasal scars are flat and indistinguishable from surrounding skin. Unfortunately, even with meticulous surgical execution, nasal scars can occasionally be suboptimal. Abnormal fibroblast response can lead to hypertrophic nasal scars, and excessive angiogenesis may lead to telangiectasias or an erythematous scar. Imperfect surgical closure or poor postoperative management can lead to surgical outcomes with step-offs, depressions, suture marks, or dyspigmentation...
February 2017: Facial Plastic Surgery: FPS
https://www.readbyqxmd.com/read/28226366/principles-of-nasal-reconstruction
#7
Emily Spataro, Gregory H Branham
The rise in cutaneous malignancies over the past 20 years has led to significant advances in reconstructing the nose from an aesthetic and functional standpoint. The principles of nasal reconstruction center on application of the nasal subunit principle, three-layered reconstruction, nasal skin characteristics, and patient factors. Reconstructive planning starts with proper defect analysis, followed by application of the reconstructive ladder for soft-tissue repair, adequate structural support, and repair of nasal lining deficits...
February 2017: Facial Plastic Surgery: FPS
https://www.readbyqxmd.com/read/28225918/the-aplication-of-cyanoacrilate-surgical-glue-on-skin-suture-in-rats
#8
João Ilgenfritz, Ricardo Dutra Aydos, Iandara Schettert Silva, Rondon Tosta Ramalho, João Ilgenfritz, Gerson Gattats Orro de Campos, Ricardo Kenithi Nakamura, Danilo M Zanello Guerisoli, Wilson de Barros Cantero
Purpose: To compare the use of a new cyanoacrylate-based surgical glue and suture with sepa-rate points in skin wounds closure. Methods: Thirty-six rats were subjected to a 4cm dorsal longitudinal incision. Twelve were sub-jected to simple suture with polyamide 6-0, 12 rats underwent wall synthesis using Dermabond(r) and 12 was performed cutaneous synthesis with N-2-Butyl-Cyanoacrylate. Twelve of each group was euthanized on the seventh postoperative day, their blood was taken to biochemical tests and a layer of skin and subcutaneous tissue surrounding the surgical scar was randomly divided in two segments, to the submission of tension tests and to histological study...
January 2017: Acta Cirúrgica Brasileira
https://www.readbyqxmd.com/read/28224227/-exceptional-pacemaker-complication-in-still-s-disease
#9
Salma Haj Kheder, Thomas Hummel, Heike Majewski, Rafael Jimènez, Alexander Wutzler
CASE REPORT: A 49-year-old man with Still's disease presented with a rash above his pacemaker scar. In 2012, there was a replacement of the generator in which the position was changed from subpectoral to subcutaneous. A revision operation was performed after the local finding became worse, turning from a granuloma to a macula. THERAPY: During surgery, a superficial position of the leads was revealed. Both leads and generator were removed with great effort from the granulation tissue...
February 21, 2017: Herzschrittmachertherapie & Elektrophysiologie
https://www.readbyqxmd.com/read/28224209/-suture-techniques-and-material-in-surgery-of-flexor-tendons
#10
T Pillukat, R Fuhrmann, J Windolf, J van Schoonhoven
Adhesions and scar formation between flexor tendons and the surrounding tissue are only contemporarily avoidable by movement of flexor tendons. Concepts with active follow-up protocols are more favorable than passive mobilization. The main risks of flexor tendon repair are rupture of the tendon suture, insidious gap formation and resistance to tendon gliding within the tendon sheath. Currently, there is no consensus with respect to the optimal suture technique or suture material. Nevertheless, there are some principles worth paying attention to, such as using stronger suture material, blocking stitches, suture techniques with four or more strands as well as circular running sutures...
February 21, 2017: Der Chirurg; Zeitschrift Für Alle Gebiete der Operativen Medizen
https://www.readbyqxmd.com/read/28223982/mouse-model-of-neurological-complications-resulting-from-encephalitic-alphavirus-infection
#11
Shannon E Ronca, Jeanon Smith, Takaaki Koma, Magda M Miller, Nadezhda Yun, Kelly T Dineley, Slobodan Paessler
Long-term neurological complications, termed sequelae, can result from viral encephalitis, which are not well understood. In human survivors, alphavirus encephalitis can cause severe neurobehavioral changes, in the most extreme cases, a schizophrenic-like syndrome. In the present study, we aimed to adapt an animal model of alphavirus infection survival to study the development of these long-term neurological complications. Upon low-dose infection of wild-type C57B/6 mice, asymptomatic and symptomatic groups were established and compared to mock-infected mice to measure general health and baseline neurological function, including the acoustic startle response and prepulse inhibition paradigm...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28223754/almost-unilateral-focal-dermal-hypoplasia
#12
Solam Lee, Sung Jay Choe, Sung Ku Ahn
Focal dermal hypoplasia, caused by mutations in PORCN, is an X-linked ectodermal dysplasia, also known as Goltz syndrome. Only seven cases of unilateral or almost unilateral focal dermal hypoplasia have been reported in the English literature and there have been no previously reported cases in the Republic of Korea. A 19-year-old female presented with scalp defects, skin lesions on the right leg and the right trunk, and syndactyly of the right fourth and fifth toes. Cutaneous examination revealed multiple atrophic plaques and a brown and yellow mass with fat herniation and telangiectasia that was mostly located on the lower right leg...
February 2017: Annals of Dermatology
https://www.readbyqxmd.com/read/28223486/serum-borne-bioactivity-caused-by-pulmonary-multiwalled-carbon-nanotubes-induces-neuroinflammation-via-blood-brain-barrier-impairment
#13
Mario J Aragon, Lauren Topper, Christina R Tyler, Bethany Sanchez, Katherine Zychowski, Tamara Young, Guy Herbert, Pamela Hall, Aaron Erdely, Tracy Eye, Lindsey Bishop, Samantha A Saunders, Pretal P Muldoon, Andrew K Ottens, Matthew J Campen
Pulmonary exposure to multiwalled carbon nanotubes (MWCNTs) causes indirect systemic inflammation through unknown pathways. MWCNTs translocate only minimally from the lungs into the systemic circulation, suggesting that extrapulmonary toxicity may be caused indirectly by lung-derived factors entering the circulation. To assess a role for MWCNT-induced circulating factors in driving neuroinflammatory outcomes, mice were acutely exposed to MWCNTs (10 or 40 µg/mouse) via oropharyngeal aspiration. At 4 h after MWCNT exposure, broad disruption of the blood-brain barrier (BBB) was observed across the capillary bed with the small molecule fluorescein, concomitant with reactive astrocytosis...
February 21, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28223417/papers-of-note-in-science355-6326
#14
Annalisa M VanHook
This week's articles identify a requirement for lipid transport between the endoplasmic reticulum and plasma membrane in insulin release, a mechanism in which contact with a host cell reprograms bacterial gene expression, a signal from a soybean pathogen that impairs soybean's defense response, and a mechanism by which hair follicles may be leveraged to reduce scar formation.
February 21, 2017: Science Signaling
https://www.readbyqxmd.com/read/28222965/ventricular-arrhythmias-and-sudden-death-in-tetralogy-of-fallot
#15
REVIEW
Philippe Maury, Frederic Sacher, Anne Rollin, Pierre Mondoly, Alexandre Duparc, Katja Zeppenfeld, Sebastien Hascoet
Malignant ventricular arrhythmias and sudden cardiac death may late happen in repaired tetralogy of Fallot, although probably less frequently than previously thought, especially with the advent of new surgical techniques/management. Ventricular tachycardias are caused by reentry around the surgical scars/patches and valves. Many predictive factors have been proposed, which suffer from poor accuracy. There is currently no recommended indication for prophylactic implantable cardioverter defibrillator implantation-except maybe in the case of multiple risk factors-while radiofrequncy ablation may be proposed in secondary prevention with or even without a back-up implantable cardioverter defibrillator in selected cases...
February 17, 2017: Archives of Cardiovascular Diseases
https://www.readbyqxmd.com/read/28221665/totally-percutaneous-versus-surgical-cut-down-femoral-artery-access-for-elective-bifurcated-abdominal-endovascular-aneurysm-repair
#16
REVIEW
Madelaine Gimzewska, Alexander Ir Jackson, Su Ern Yeoh, Mike Clarke
BACKGROUND: Abdominal aortic aneurysms (AAAs) are a vascular condition with significant risk attached, particularly if they rupture. It is, therefore, critical to identify and repair these as an elective procedure before they rupture and require emergency surgery. Repair has traditionally been an open surgical technique that required a large incision across the abdomen. Endovascular abdominal aortic aneurysm repairs (EVARs) are now a common alternative. In this procedure, the common femoral artery is exposed via a cut-down approach and a graft introduced to the aneurysm in this way...
February 21, 2017: Cochrane Database of Systematic Reviews
https://www.readbyqxmd.com/read/28221299/treatment-of-burn-and-surgical-wounds-with-recombinant-human-tropoelastin-produces-new-elastin-fibers-in-scars
#17
Hua Xie, Lisa Lucchesi, Bo Zheng, Elena Ladich, Teresa Pineda, Rose Merten, Cynthia Gregory, Michael Rutten, Kenton Gregory
Tropoelastin (TE), the soluble precursor of insoluble elastin fibers, is produced in minimal amounts in adults. Burn injuries result in inflexible collagen-rich scars because of lack of elastin fiber formation. We studied the feasibility of using recombinant human tropoelastin to enable elastin fiber production in burn and surgical scars to improve skin flexibility. In a swine hypertrophic burn scar model, normal skin and 3 × 3-cm partial thickness thermal burns underwent dermatome resection at 1 week post burn and randomized to four subcutaneous injections of saline or TE (either 0...
February 15, 2017: Journal of Burn Care & Research: Official Publication of the American Burn Association
https://www.readbyqxmd.com/read/28221294/thermal-burn-scar-related-squamous-cell-carcinoma-in-the-eyelid
#18
Bulent Yazici, Gamer Aliyeva, Zarema Ferik
A 63-year-old woman presented with a large, ulcerokeratotic mass in her right lower eyelid that had grown over the last 2 months in a burn scar. She had experienced a thermal burn involving both inferior periorbital areas 35 years ago and received medical treatment. The lesion was excised with wide margins. The histologic diagnosis was squamous cell carcinoma. No recurrence was observed during a 22-month follow up. In the previous literature, a total of 10 cases of eyelid burn scar neoplasm, of which 9 were basal cell carcinoma, have been reported...
February 17, 2017: Ophthalmic Plastic and Reconstructive Surgery
https://www.readbyqxmd.com/read/28221291/ophthalmic-manifestations-of-facial-dog-bites-in-children
#19
Emily M Bratton, Liliya Golas, Leslie A Wei, Brett W Davies, Vikram D Durairaj
PURPOSE: To characterize ophthalmic manifestations and periocular injuries of pediatric facial dog bites. METHODS: A retrospective review of all children younger than 18 years who sought medical attention after a dog bite to the face between January 1, 2003 and May 22, 2014 was performed at a large tertiary pediatric hospital. Data on type and location of injury, surgical intervention, and complications were collected. RESULTS: A total of 1,989 children aged 0...
February 17, 2017: Ophthalmic Plastic and Reconstructive Surgery
https://www.readbyqxmd.com/read/28221245/an-articulating-antibiotic-cement-spacer-for-first-stage-reconstruction-for-infected-total-elbow-arthroplasty
#20
Kanishka E Williams, Simon MacLean, Jesse Jupiter, Gregory I Bain
Management of an infected total elbow replacement is a significant clinical challenge. Although preservation of the prosthesis is ideal, a 2-stage revision is often necessary. Unlike lower limb arthroplasty, antibiotic spacers are not commercially available. Monoblock cement spacers do not allow elbow movements and are therefore associated with severe stiffness and scarring, leading to poor clinical outcomes. In our paper we present a simple and novel technique for constructing an articulating antibiotic-impregnated spacer for use as an implant for a 1-stage revision of an infected elbow arthroplasty...
February 17, 2017: Techniques in Hand & Upper Extremity Surgery
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