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https://www.readbyqxmd.com/read/29324475/bilateral-cochlear-implants-maximizing-expected-outcomes
#1
Kate E Willis, Nathan J Blum, Stephanie A Waryasz, Marilyn Augustyn
Sonia is a 4 1/12-year-old girl with Waardenburg syndrome and bilateral sensorineural hearing loss who had bilateral cochlear implants at 2 7/12 years of age. She is referred to Developmental-Behavioral Pediatrics by her speech/language pathologist because of concerns that her language skills are not progressing as expected after the cochlear implant. At the time of the implant, she communicated using approximately 20 signs and 1 spoken word (mama). At the time of the evaluation (18 months after the implant) she had approximately 70 spoken words (English and Spanish) and innumerable signs that she used to communicate...
January 10, 2018: Journal of Developmental and Behavioral Pediatrics: JDBP
https://www.readbyqxmd.com/read/29318324/strategies-for-a%C3%A2-regenerative-therapy-of-hearing-loss
#2
REVIEW
M Diensthuber, T Stöver
Despite impressive technical progress in the field of conventional hearing aids and implantable hearing systems, the hopes for the treatment of inner ear diseases such as hearing loss and tinnitus have become increasingly directed toward regenerative therapeutic approaches. This review discusses the currently most promising strategies for hair cell regeneration in the inner ear to treat hearing loss, including stem cell-based, gene transfer-based, and pharmacological interventions. Furthermore, previous milestones and ground-breaking work in this scientific field are identified...
January 9, 2018: HNO
https://www.readbyqxmd.com/read/29305691/the-capos-mutation-in-atp1a3-alters-na-k-atpase-function-and-results-in-auditory-neuropathy-which-has-implications-for-management
#3
Lisbeth Tranebjærg, Nicola Strenzke, Sture Lindholm, Nanna D Rendtorff, Hanne Poulsen, Himanshu Khandelia, Wojciech Kopec, Troels J Brünnich Lyngbye, Christian Hamel, Cecile Delettre, Beatrice Bocquet, Michael Bille, Hanne H Owen, Toke Bek, Hanne Jensen, Karen Østergaard, Claes Möller, Linda Luxon, Lucinda Carr, Louise Wilson, Kaukab Rajput, Tony Sirimanna, Katherine Harrop-Griffiths, Shamima Rahman, Barbara Vona, Julia Doll, Thomas Haaf, Oliver Bartsch, Hendrik Rosewich, Tobias Moser, Maria Bitner-Glindzicz
Cerebellar ataxia, areflexia, pes cavus, optic atrophy and sensorineural hearing impairment (CAPOS) is a rare clinically distinct syndrome caused by a single dominant missense mutation, c.2452G>A, p.Glu818Lys, in ATP1A3, encoding the neuron-specific alpha subunit of the Na+/K+-ATPase α3. Allelic mutations cause the neurological diseases rapid dystonia Parkinsonism and alternating hemiplegia of childhood, disorders which do not encompass hearing or visual impairment. We present detailed clinical phenotypic information in 18 genetically confirmed patients from 11 families (10 previously unreported) from Denmark, Sweden, UK and Germany indicating a specific type of hearing impairment-auditory neuropathy (AN)...
January 5, 2018: Human Genetics
https://www.readbyqxmd.com/read/29285533/scaffold-assisted-artificial-hair-implantation-in-a-rat-model
#4
Joshua K Au, Miguel Fernando Palma Diaz, Tara Aghaloo, Maie A St John
Importance: Current treatments for alopecia with autograft hair transplantation face limitations that may preclude complete hair restoration and leave patients with donor site scars. Scaffold assisted artificial hair implantation as demonstrated in a rat model may provide an adjunct for hair restoration without donor site morbidity. Objective: To design and create porous high-density polyethylene (PHDPE) and expanded polytetrafluoroethylene (ePTFE) hair-bearing scaffolds and evaluate their biocompatibility in a rat model...
December 28, 2017: JAMA Facial Plastic Surgery
https://www.readbyqxmd.com/read/29240567/theoretical-evaluation-and-experimental-validation-of-localized-therapeutic-hypothermia-application-to-preserve-residual-hearing-after-cochlear-implantation
#5
Ilmar Tamames, Curtis King, Chin-Yuh Huang, Fred F Telischi, Michael E Hoffer, Suhrud M Rajguru
OBJECTIVES: Cochlear implantation surgery has been shown to result in trauma to inner ear sensory structures, resulting in loss of residual hearing. Localized therapeutic hypothermia has been shown in clinical care to be a neuroprotective intervention. Previously, we have shown in an experimental model that localized hypothermia protects cochlear hair cells and residual hearing function against surgical and cochlear implantation trauma. Using experimental temperature measurements carried out in human cadaver temporal bones and a finite element model of the inner ear, the present study examined the temperature distribution of a custom-designed hypothermia delivery system in the human inner ear organs...
December 13, 2017: Ear and Hearing
https://www.readbyqxmd.com/read/29227036/bottom-up-nanoencapsulation-from-single-cells-to-tunable-and-scalable-cellular-spheroids-for-hair-follicle-regeneration
#6
Jin Wang, Yong Miao, Yong Huang, Bojie Lin, Xiaomin Liu, Shune Xiao, Lijuan Du, Zhiqi Hu, Malcolm Xing
Cell surface engineering technology advances cell therapeutics and tissue engineering by accurate micro/nanoscale control in cell-biomaterial ensembles and cell spheroids formation. By tailoring cell surface, microgels can encapsulate cells for versatile uses. However, microgels are coated in a thick layer to house multiple cells together but not a single cell based. Besides, excessive deposition on cell surface is detrimental to cellular functions. Herein, layer-by-layer (LbL) self-assembly to encapsulate single cell using nanogel is reported, owing to its security and tunable thickness at nanoscale, and further forms cell spheroids by physical cross-linking on nanogel-coated cells for delivery...
December 11, 2017: Advanced Healthcare Materials
https://www.readbyqxmd.com/read/29184165/atp1a3-mutations-can-cause-progressive-auditory-neuropathy-a-new-gene-of-auditory-synaptopathy
#7
Kyu-Hee Han, Doo-Yi Oh, Seungmin Lee, Chung Lee, Jin Hee Han, Min Young Kim, Hye-Rim Park, Moo Kyun Park, Nayoung K D Kim, Jaekwang Lee, Eunyoung Yi, Jong-Min Kim, Jeong-Whun Kim, Jong-Hee Chae, Seung Ha Oh, Woong-Yang Park, Byung Yoon Choi
The etiologies and prevalence of sporadic, postlingual-onset, progressive auditory neuropathy spectrum disorder (ANSD) have rarely been documented. Thus, we aimed to evaluate the prevalence and molecular etiologies of these cases. Three out of 106 sporadic progressive hearing losses turned out to manifest ANSD. Through whole exome sequencing and subsequent bioinformatics analysis, two out of the three were found to share a de novo variant, p.E818K of ATP1A3, which had been reported to cause exclusively CAPOS (cerebellar ataxia, areflexia, pes cavus, optic atrophy, and sensorineural hearing loss) syndrome...
November 28, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29125405/cutibacterium-formerly-propionibacterium-acnes-infections-associated-with-implantable-devices
#8
Amal A Gharamti, Zeina A Kanafani
Cutibacterium acnes (C. acnes), a Gram-positive biofilm-forming rod implicated in acne vulgaris, is increasingly recognized for its role in implant-associated infections. The diagnosis of C. acnes implant-associated infections remains challenging. The optimal treatment is a combination of both surgical intervention and antibiotic therapy. Areas covered: In this review, we discuss the different types of implant-associated infections caused by C. acnes. We also highlight the clinical manifestations pertaining to the various sites of infection, and identify several risk factors previously reported in the literature...
December 2017: Expert Review of Anti-infective Therapy
https://www.readbyqxmd.com/read/29124373/-the-chignon-mastopexy-a-double-glandular-suspended-flaps-for-an-auto-augmentation-effect
#9
Bouraoui Kotti
BACKGROUND: Many mastopexy techniques have been described in the literature focusing on the new nipple areolar complex position and the breast deflation treatment, but only few of them detailed the glandular volume redistribution to avoid the use of implants. We describe a mastopexy procedure that brings the maximum of the volume to the central part of the breast. We compare the procedure to a "chignon" hair style way to vulgarize the technique and simplify its comprehension. METHODS: Breast volume is reshaped by the use of a vertical mastopexy and two deepithelized glandular flaps sutured for the first one to the pectoralis major fascia and for the second one to the contralateral flap...
November 9, 2017: Aesthetic Plastic Surgery
https://www.readbyqxmd.com/read/29123468/a-model-based-approach-for-separating-the-cochlear-microphonic-from-the-auditory-nerve-neurophonic-in-the-ongoing-response-using-electrocochleography
#10
Tatyana E Fontenot, Christopher K Giardina, Douglas C Fitzpatrick
Electrocochleography (ECochG) is a potential clinically valuable technique for predicting speech perception outcomes in cochlear implant (CI) recipients, among other uses. Current analysis is limited by an inability to quantify hair cell and neural contributions which are mixed in the ongoing part of the response to low frequency tones. Here, we used a model based on source properties to account for recorded waveform shapes and to separate the combined signal into its components. The model for the cochlear microphonic (CM) was a sinusoid with parameters for independent saturation of the peaks and the troughs of the responses...
2017: Frontiers in Neuroscience
https://www.readbyqxmd.com/read/29119047/infections-in-deep-brain-stimulation-shaving-versus-not-shaving
#11
Felix S Gubler, Linda Ackermans, Pieter L Kubben, Aysun Damci, Mark L Kuijf, Mayke Oosterloo, R Jeroen Vermeulen, Sarah Hescham, Ersoy Kocabicak, Erkan Kurt, Yasin Temel
Background: To report our experience of infections in deep brain stimulation (DBS) surgeries comparing shaving versus no shaving of cranial hair. Nonshaving is strongly preferred by patients due to aesthetic and psychological factors. Methods: This study is a prospective follow-up of the infection rate in 43 nonshaven DBS cases between April 2014 and December 2015 compared to our former infection rate with shaving in our center. Minimum follow-up was 6 months. All patients, except 7 epilepsy patients, received implantation of the electrodes together with the extension cables and internal pulse generator in one session...
2017: Surgical Neurology International
https://www.readbyqxmd.com/read/29084395/electrophysiological-evidence-of-the-basilar-membrane-travelling-wave-and-frequency-place-coding-of-sound-in-cochlear-implant-recipients
#12
Luke Campbell, Christofer Bester, Claire Iseli, David Sly, Adrian Dragovic, Anthony W Gummer, Stephen O'Leary
AIM: To obtain direct evidence for the cochlear travelling wave in humans by performing electrocochleography from within the cochlea in subjects implanted with an auditory prosthesis. BACKGROUND: Sound induces a travelling wave that propagates along the basilar membrane, exhibiting cochleotopic tuning with a frequency-dependent phase delay. To date, evoked potentials and psychophysical experiments have supported the presence of the travelling wave in humans, but direct measurements have not been made...
2017: Audiology & Neuro-otology
https://www.readbyqxmd.com/read/28953607/patterns-seen-during-electrode-insertion-using-intracochlear-electrocochleography-obtained-directly-through-a-cochlear-implant
#13
Michael S Harris, William J Riggs, Christopher K Giardina, Brendan P O'Connell, Jourdan T Holder, Robert T Dwyer, Kanthaiah Koka, Robert F Labadie, Douglas C Fitzpatrick, Oliver F Adunka
HYPOTHESIS: Intraoperative, intracochlear electrocochleography (ECochG) will provide a means to monitor cochlear hair cell and neural response during cochlear implant (CI) electrode insertion. Distinct patterns in the insertion track can be characterized. BACKGROUND: Conventional CI surgery is performed without a means of actively monitoring cochlear hair cell and neural responses. Intracochlear ECochG obtained directly through the CI may be a source of such feedback...
December 2017: Otology & Neurotology
https://www.readbyqxmd.com/read/28932061/epidermal-cysts-a-clinicopathological-analysis-with-emphasis-on-unusual-findings
#14
Jitendra Singh Nigam, Jyotsna Naresh Bharti, Vivek Nair, Chitrawati Bal Gargade, Archana Hemant Deshpande, Biswajit Dey, Ashok Singh
BACKGROUND: Epidermoid cysts, one of the common benign intradermal or subcutaneous tumors commonly result from the trauma to the pilosebaceous unit in the hair bearing area. In areas without hair, these cysts are considered implantation and proliferation of squamous epithelium into the dermis due to injury. AIMS: The aim is to evaluate the clinicopathological details with emphasis on unusual findings related to epidermoid cysts. STUDY DESIGN: This is a retrospective cross-sectional study carried out over 2 years...
July 2017: International Journal of Trichology
https://www.readbyqxmd.com/read/28931463/severe-streptomycin-ototoxicity-in-the-mouse-utricle-leads-to-a-flat-epithelium-but-the-peripheral-neural-degeneration-is-delayed
#15
Guo-Peng Wang, Ishani Basu, Lisa A Beyer, Hiu Tung Wong, Donald L Swiderski, Shu-Sheng Gong, Yehoash Raphael
The damaged vestibular sensory epithelium of mammals has a limited capacity for spontaneous hair cell regeneration, which largely depends on the transdifferentiation of surviving supporting cells. Little is known about the response of vestibular supporting cells to a severe insult. In the present study, we evaluated the impact of a severe ototoxic insult on the histology of utricular supporting cells and the changes in innervation that ensued. We infused a high dose of streptomycin into the mouse posterior semicircular canal to induce a severe lesion in the utricle...
November 2017: Hearing Research
https://www.readbyqxmd.com/read/28892270/biomimetic-artificial-basilar-membranes-for-next-generation-cochlear-implants
#16
REVIEW
Jongmoon Jang, Jeong Hun Jang, Hongsoo Choi
Patients with sensorineural hearing loss can recover their hearing using a cochlear implant (CI). However, there is a need to develop next-generation CIs to overcome the limitations of conventional CIs caused by extracorporeal devices. Recently, artificial basilar membranes (ABMs) are actively studied for next-generation CIs. The ABM is an acoustic transducer that mimics the mechanical frequency selectivity of the BM and acoustic-to-electrical energy conversion of hair cells. This paper presents recent progress in biomimetic ABMs...
September 11, 2017: Advanced Healthcare Materials
https://www.readbyqxmd.com/read/28886268/implanted-hair-follicle-associated-pluripotent-hap-stem-cells-encapsulated-in-polyvinylidene-fluoride-membrane-cylinders-promote-effective-recovery-of-peripheral-nerve-injury
#17
Aiko Yamazaki, Kohya Obara, Natsuko Tohgi, Kyoumi Shirai, Sumiyuki Mii, Yuko Hamada, Nobuko Arakawa, Ryoichi Aki, Robert M Hoffman, Yasuyuki Amoh
Hair follicle-associated-pluripotent (HAP) stem cells are located in the bulge area of the hair follicle, express the stem-cell marker, nestin, and have been shown to differentiate to nerve cells, glial cells, keratinocytes, smooth muscle cells, cardiac muscle cells, and melanocytes. Transplanted HAP stem cells promote the recovery of peripheral nerve and spinal cord injuries and have the potential for heart regeneration as well. In the present study, we implanted mouse green fluorescent protein (GFP)-expressing HAP stem-cell spheres encapsulated in polyvinylidene fluoride (PVDF)-membrane cylinders into the severed sciatic nerve of immunocompetent and immunocompromised (nude) mice...
October 18, 2017: Cell Cycle
https://www.readbyqxmd.com/read/28840850/classification-and-current-management-of-inner-ear-malformations
#18
Levent Sennaroğlu, Münir Demir Bajin
Morphologically congenital sensorineural hearing loss can be investigated under two categories. The majority of congenital hearing loss causes (80%) are membranous malformations. Here, the pathology involves inner ear hair cells. There is no gross bony abnormality and, therefore, in these cases high-resolution computerized tomography and magnetic resonance imaging of the temporal bone reveal normal findings. The remaining 20% have various malformations involving the bony labyrinth and, therefore, can be radiologically demonstrated by computerized tomography and magnetic resonance imaging...
September 29, 2017: Balkan Medical Journal
https://www.readbyqxmd.com/read/28839395/staphylococcus-lugdunensis-and-trichophyton-tonsurans-infection-in-synthetic-hair-implants
#19
Pedro Colli, Antonia Fellas, Ralph M Trüeb
Synthetic hair implants are considered in alopecia when the patient requests an immediate result with minor surgery and with a poor donor area. However, the procedure has historically been marred by poor quality fiber and performance resulting in serious complications. Nevertheless, companies continue to market the procedure with the claim that previous problems have been sorted out. We report a case of inflammation in synthetic hair implants, in which microbiological studies revealed infection with Staphylococcus lugdunensis and Trichophyton tonsurans...
April 2017: International Journal of Trichology
https://www.readbyqxmd.com/read/28818455/adipose-derived-stromal-cells-enhance-auditory-neuron-survival-in-an-animal-model-of-sensory-hearing-loss
#20
Philipp Schendzielorz, Maike Vollmer, Kristen Rak, Armin Wiegner, Nashwa Nada, Katrin Radeloff, Rudolf Hagen, Andreas Radeloff
BACKGROUND: A cochlear implant (CI) is an electronic prosthesis that can partially restore speech perception capabilities. Optimum information transfer from the cochlea to the central auditory system requires a proper functioning auditory nerve (AN) that is electrically stimulated by the device. In deafness, the lack of neurotrophic support, normally provided by the sensory cells of the inner ear, however, leads to gradual degeneration of auditory neurons with undesirable consequences for CI performance...
August 14, 2017: Cytotherapy
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