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https://www.readbyqxmd.com/read/28538471/foreign-body-response-to-silicone-in-cochlear-implant-electrodes-in-the-human
#1
Jennifer T O'Malley, Barbara J Burgess, Donald Galler, Joseph B Nadol
HYPOTHESIS: Silicone as part of a cochlear implant electrode may be responsible for a foreign body response in the human. BACKGROUND: Clinical evidence of a foreign body response to a cochlear implant has been reported. In a previous study, particulate material found within the fibrous sheath and within macrophages surrounding a cochlear implant has been identified as being consistent with platinum. However, to date, there has been no histologic evidence of a role for silicone in this cellular immune response...
May 22, 2017: Otology & Neurotology
https://www.readbyqxmd.com/read/28538470/progression-of-unilateral-hearing-loss-in-children-with-and-without-ipsilateral-cochlear-nerve-canal-stenosis-a-hazard-analysis
#2
Patricia L Purcell, Justin R Shinn, Scott S Coggeshall, Grace Phillips, Angelisa Paladin, Kathleen C Y Sie, David L Horn
OBJECTIVE: To investigate the risk of hearing loss progression in each ear among children with unilateral hearing loss associated with ipsilateral bony cochlear nerve canal (BCNC) stenosis. SETTING: Tertiary pediatric referral center. PATIENTS: Children diagnosed with unilateral hearing loss who had undergone temporal bone computed tomography imaging and had at least 6 months of follow-up audiometric testing were identified from a prospective audiological database...
May 22, 2017: Otology & Neurotology
https://www.readbyqxmd.com/read/28534710/systematic-review-radiological-and-histological-evidence-of-cochlear-implant-insertion-trauma-in-adult-patients
#3
Emma Hoskison, Scott Mitchell, Chris Coulson
INTRODUCTION: Cochlear implantation (CI) has developed from its origins in the 1980s. Initially, CI was for profound bilateral hearing impairment. However, candidacy for CI have become more widespread in recent years with unilateral implantation and an emphasis on hearing preservation. Evidence supports full electrode insertion in an atraumatic fashion into the scala tympani (ST) provides optimal hearing outcomes. The main aim of this systematic review was to elucidate the degree of trauma associated with CI insertion...
May 23, 2017: Cochlear Implants International
https://www.readbyqxmd.com/read/28532970/improving-resident-familiarity-with-the-translabyrinthine-approach-to-the-internal-auditory-canal
#4
Matthew M Dedmon, Brendan P O'Connell, Austin S Adams, George B Wanna, David S Haynes
OBJECTIVE: To increase otolaryngology resident experience with drilling and dissection of the internal auditory canal (IAC) via a translabyrinthine approach. STUDY DESIGN: Pilot study involving temporal bone education and drilling with completion of pre- and post-drilling surveys. METHODS: Participants observed an educational presentation on IAC anatomy and drilling, followed by manipulation of IAC nerves using a prosected cadaveric temporal bone...
April 12, 2017: American Journal of Otolaryngology
https://www.readbyqxmd.com/read/28528370/systematic-radiographic-evaluation-of-three-potential-implantation-sites-for-a-semi-implantable-bone-conduction-device-in-52-patients-after-previous-mastoid-surgery
#5
Bernhard G Weiss, Mattis Bertlich, Rebecka Scheele, Martin Canis, Mark Jakob, Jan M Sohns, Friedrich Ihler
The aim of this study was the evaluation of three localizations for the implantation of a semi-implantable transcutaneous bone conduction device after previous mastoid surgery. This is a retrospective review of electronic datasets of cranial computed tomography studies. The study setting is one tertiary referral center and included 52 consecutive adult patients (60 temporal bones) with a history of mastoid surgery. The intervention was virtual placement of the device with a planning software within the remaining mastoid as well as dorsal of the sigmoid sinus and caudal of the transverse sinus (retrosigmoidal localization) and dorsocranial of the parietomastoid suture and cranial of the transverse sinus (parietal localization)...
May 20, 2017: European Archives of Oto-rhino-laryngology
https://www.readbyqxmd.com/read/28526291/direct-radiocarbon-dating-and-dna-analysis-of-the-darra-i-kur-afghanistan-human-temporal-bone
#6
Katerina Douka, Viviane Slon, Chris Stringer, Richard Potts, Alexander Hübner, Matthias Meyer, Fred Spoor, Svante Pääbo, Tom Higham
The temporal bone discovered in the 1960s from the Darra-i-Kur cave in Afghanistan is often cited as one of the very few Pleistocene human fossils from Central Asia. Here we report the first direct radiocarbon date for the specimen and the genetic analyses of DNA extracted and sequenced from two areas of the bone. The new radiocarbon determination places the find to ∼4500 cal BP (∼2500 BCE) contradicting an assumed Palaeolithic age of ∼30,000 years, as originally suggested. The DNA retrieved from the specimen originates from a male individual who carried mitochondrial DNA of the modern human type...
June 2017: Journal of Human Evolution
https://www.readbyqxmd.com/read/28525313/a-tunable-three-dimensional-in-vitro-culture-model-of-growth-plate-cartilage-using-alginate-hydrogel-scaffolds
#7
Alek G Erickson, Taylor D Laughlin, Sarah M Romereim, Catherine N Sargus-Patino, Angela K Pannier, Andrew T Dudley
Defining the final size and geometry of engineered tissues through precise control of the scalar and vector components of tissue growth is a necessary benchmark for regenerative medicine, but it has proved to be a significant challenge for tissue engineers. The growth plate cartilage that promotes elongation of the long bones is a good model system for studying morphogenetic mechanisms because cartilage is composed of a single cell type, the chondrocyte; chondrocytes are readily maintained in culture; and growth trajectory is predominately in a single vector...
May 18, 2017: Tissue Engineering. Part A
https://www.readbyqxmd.com/read/28523516/pre-operative-screening-and-manual-drilling-strategies-to-reduce-the-risk-of-thermal-injury-during-minimally-invasive-cochlear-implantation-surgery
#8
Neal P Dillon, Loris Fichera, Kyle Kesler, M Geraldine Zuniga, Jason E Mitchell, Robert J Webster, Robert F Labadie
This article presents the development and experimental validation of a methodology to reduce the risk of thermal injury to the facial nerve during minimally invasive cochlear implantation surgery. The first step in this methodology is a pre-operative screening process, in which medical imaging is used to identify those patients that present a significant risk of developing high temperatures at the facial nerve during the drilling phase of the procedure. Such a risk is calculated based on the density of the bone along the drilling path and the thermal conductance between the drilling path and the nerve, and provides a criterion to exclude high-risk patients from receiving the minimally invasive procedure...
May 18, 2017: Annals of Biomedical Engineering
https://www.readbyqxmd.com/read/28523266/stimulating-fracture-healing-in-ischemic-environments-does-oxygen-direct-stem-cell-fate-during-fracture-healing
#9
REVIEW
Katherine R Miclau, Sloane A Brazina, Chelsea S Bahney, Kurt D Hankenson, Thomas K Hunt, Ralph S Marcucio, Theodore Miclau
Bone fractures represent an enormous societal and economic burden as one of the most prevalent causes of disability worldwide. Each year, nearly 15 million people are affected by fractures in the United States alone. Data indicate that the blood supply is critical for fracture healing; as data indicate that concomitant bone and vascular injury are major risk factors for non-union. However, the various role(s) that the vasculature plays remains speculative. Fracture stabilization dictates stem cell fate choices during repair...
2017: Frontiers in Cell and Developmental Biology
https://www.readbyqxmd.com/read/28518107/a-large-lateral-craniotomy-procedure-for-mesoscale-wide-field-optical-imaging-of-brain-activity
#10
Michael Kyweriga, Jianjun Sun, Sunny Wang, Richard Kline, Majid H Mohajerani
The craniotomy is a commonly performed procedure to expose the brain for in vivo experiments. In mouse research, most labs utilize a small craniotomy, typically 3 mm x 3 mm. This protocol introduces a method for creating a substantially larger 7 mm x 6 mm cranial window exposing most of a cerebral hemisphere over the mouse temporal and parietal cortices (e.g., bregma 2.5 - 4.5 mm, lateral 0 - 6 mm). To perform this surgery, the head must be tilted approximately 30° and much of the temporal muscle must be retracted...
May 7, 2017: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/28513219/a-temporofrontal-fascia-flap-that-penetrated-temporal-muscle-for-the-reconstruction-of-an-anterior-skull-base-bone-and-dura-a-technical-case-report
#11
Makoto Katsuno, Koichi Uchida, Akira Matsuno
During skull base surgery, reconstruction of the dura is a very important procedure. Here, the use of a temporofrontal pedicled fascia flap tunnelled between temporal muscle fibres is described. This technique is easily performed and has a low postoperative morbidity, including skin and temporal muscle complications.
May 17, 2017: British Journal of Neurosurgery
https://www.readbyqxmd.com/read/28512046/risk-factors-for-preoperative-seizures-and-loss-of-seizure-control-in-patients-undergoing-surgery-for-metastatic-brain-tumors
#12
Adela Wu, Jon D Weingart, Gary L Gallia, Michael Lim, Henry Brem, Chetan Bettegowda, Kaisorn L Chaichana
OBJECTIVE: Metastatic brain tumors are the most common brain tumors in adults. Patients with metastatic brain tumors have poor prognoses with median survival of 6-12 months. Seizures are a major presenting symptom and cause of morbidity and mortality. Risk factors for the onset of preoperative seizures and postoperative seizure control are examined. METHODS: Adult patients who underwent resection of one or more brain metastases at a single institution between 1998 and 2011 were retrospectively reviewed...
May 13, 2017: World Neurosurgery
https://www.readbyqxmd.com/read/28511400/a-case-report-of-a-giant-cholesteatoma
#13
Neelam Sood, Binit Kumar Khandelia, Gitanjali Bugnait
Cholesteatoma is a well demarcated, non-neoplastic, temporal bone cystic lesion with extensive keratinisation. Keratoma and epidermoid cyst are other possibly more accurate names suggested to describe the same. It can be classified as congenital or acquired. Its management is often complicated by its tendency to recidivism/recurrence. Long standing cholesteatomas can be a precursor for squamous cell carcinoma. We hereby present a case of giant cholesteatoma in a 45-year-old female with radiological involvement of the left temporal region, periauricular region and infratemporal fossa with lytic destruction of left middle ear ossicles, mastoid and squamous part of temporal bone with intracranial extension...
March 2017: Journal of Clinical and Diagnostic Research: JCDR
https://www.readbyqxmd.com/read/28507207/role-of-osteocytes-in-mediating-bone-mineralization-during-hyperhomocysteinemia
#14
Viji Vijayan, Sarika Gupta
Hyperhomocysteinemia (HHCY) is a risk factor for osteoporosis but whether HHCY affects bone mineralization or not is still ambiguous. Herein we evaluated whether homocysteine affects tissue mineral density (TMD) of cortical bone and if so the role of osteocytes. CD1 mice administered with homocysteine (5 mg/100 g body weight, i.p.) for 7, 15 and 30 days showed temporal changes in TMD and osteocyte lacunar density in femoral cortices. Short-term administration of homocysteine (day 7) increased osteocyte lacunar density and reduced TMD evidenced by microCT50 while prolonged administration of homocysteine (day 30) reinstated TMD and lacunar density to baseline values...
June 2017: Journal of Endocrinology
https://www.readbyqxmd.com/read/28506450/utility-and-versatility-of-the-supraclavicular-artery-island-flap-in-head-and-neck-reconstruction
#15
José A González-García, Carlos M Chiesa-Estomba, Jon A Sistiaga, Ekhiñe Larruscain, Leire Álvarez, Xabier Altuna
INTRODUCTION: The supraclavicular island flap is a rotational pedicled flap and may have some advantages in head and neck reconstruction compared with free-tissue transfer when this kind of reconstruction is not affordable or recommended. MATERIAL AND METHODS: We present our experience during the year 2016 in the application of the supraclavicular island flap in five cases as an alternative to microvascular reconstruction in several defects after resection of head and neck tumours...
May 12, 2017: Acta Otorrinolaringológica Española
https://www.readbyqxmd.com/read/28503116/melatonin-pharmacology-functions-and-therapeutic-benefits
#16
REVIEW
Sylvie Tordjman, Sylvie Chokron, Richard Delorme, Annaëlle Charrier, Eric Bellissant, Nemat Jaafari, Claire Fougerou
BACKGROUND: Melatonin synchronizes central but also peripheral oscillators (fetal adrenal gland, pancreas, liver, kidney, heart, lung, fat, gut, etc.), allowing temporal organization of biological functions through circadian rhythms (24-hour cycles) in relation to periodic environmental changes and therefore adaptation of the individual to his/her internal and external environment. Measures of melatonin are considered the best peripheral indices of human circadian timing based on an internal 24-hour clock...
April 2017: Current Neuropharmacology
https://www.readbyqxmd.com/read/28502566/lateral-skull-base-chondroblastoma-resected-with-facial-nerve-posterior-transposition
#17
J Adnot, O Langlois, E Tollard, M Crahes, I Auquit-Auckbur, J-P Marie
INTRODUCTION: Chondroblastoma is a rare tumor that can involve the temporal bone. Because it is a benign tumor, functional surgery must be proposed. We report a case of a patient with a massive chondroblastoma operated on with preservation of the facial nerve, and description of the surgical technique. CASE PRESENTATION: A 37-year-old man presented with a 9-month history of a growing left pre-auricular mass and hearing loss. Neuroimaging showed an osteolytic mass invading the temporal bone and temporomandibular joint...
May 11, 2017: Neuro-Chirurgie
https://www.readbyqxmd.com/read/28499297/-diagnostics-and-therapy-of-idiopathic-sudden-sensorineural-hearing-loss
#18
Stefan K Plontke
This article reviews recent aspects of diagnostics, differential diagnostics and evidence in systemic and local therapy of idiopathic, sudden, sensorineural hearing loss (ISSHL). Since a number of disorders can be accompanied by sudden hearing loss a meaningful and targeted diagnostic strategy is of utmost importance. An important differential diagnosis of sudden hearing loss are intralabyrinthine schwannomas (ILS). The incidence of ILS is probably significantly underestimated. This may be due to the lack of awareness or lack of explicit search for an intralabyrinthine tumor on MRI or an inappropriate MRI technique ('head-MRI' instead of 'temporal bone-MRI' with too high slice thickness) for the evaluation of sudden hearing loss...
April 2017: Laryngo- Rhino- Otologie
https://www.readbyqxmd.com/read/28498272/paget-s-disease-of-the-temporal-bone-a-single-institution-contemporary-review-of-27-patients
#19
Nicholas L Deep, Jake G Besch-Stokes, John I Lane, Colin L W Driscoll, Matthew L Carlson
OBJECTIVES: To report a contemporary review from a single-institution series on Paget's disease of the temporal bone (PDTB). STUDY DESIGN: Retrospective chart review of patients evaluated from 1998 to 2016. SETTING: Quaternary referral center. PATIENTS: Patients with radiographically confirmed PDTB. MAIN OUTCOME MEASURES: Clinical, audiological, and radiological features and management strategies of PDTB...
May 11, 2017: Otology & Neurotology
https://www.readbyqxmd.com/read/28493842/mesenchymal-stem-cell-infiltration-during-neoplastic-transformation-of-the-human-prostate
#20
W Nathaniel Brennen, Baohui Zhang, Ibrahim Kulac, L Nelleke Kisteman, Lizamma Antony, Hao Wang, Alan K Meeker, Angelo M De Marzo, Isla P Garraway, Samuel R Denmeade, John T Isaacs
Mesenchymal Stem Cells (MSCs) have been identified in prostate cancer, raising the critical question of their physical and temporal source. Therefore, MSCs were quantified and characterized in benign and malignant prostate tissue representing different disease states and a wide range of age groups from fetal development through adult death using analytical and functional methodologies. In contrast to lineage-restricted Mesenchymal Progenitor Cells (MPCs) found in normal prostate tissue, MSCs with tri-lineage differentiation potential (adipogenesis, osteogenesis, and chondrogenesis) are identified in prostate tissue from a subset of men with prostate cancer, consistent with an influx of more stem-like progenitors (i...
April 21, 2017: Oncotarget
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