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https://www.readbyqxmd.com/read/29149722/effects-of-middle-ear-quasi-static-stiffness-on-sound-transmission-quantified-by-a-novel-3-axis-optical-force-sensor
#1
Ivo Dobrev, Jae Hoon Sim, Baktash Aqtashi, Alexander M Huber, Thomas Linder, Christof Röösli
BACKGROUND: Intra-operative quantification of the ossicle mobility could provide valuable feedback for the current status of the patient's conductive hearing. However, current methods for evaluation of middle ear mobility are mostly limited to the surgeon's subjective impression through manual palpation of the ossicles. This study investigates how middle ear transfer function is affected by stapes quasi-static stiffness of the ossicular chain. The stiffness of the middle ear is induced by a) using a novel fiber-optic 3-axis force sensor to quantify the quasi-static stiffness of the middle ear, and b) by artificial reduction of stapes mobility due to drying of the middle ear...
November 10, 2017: Hearing Research
https://www.readbyqxmd.com/read/29145656/refining-operative-strategies-for-optic-nerve-decompression-a-morphometric-analysis-of-transcranial-and-endoscopic-endonasal-techniques-using-clinical-parameters
#2
Steven L Gogela, Lee A Zimmer, Jeffrey T Keller, Norberto Andaluz
BACKGROUND: Various approaches can be considered for decompression of the intracanalicular optic nerve. Although clinical experience has been reported, no quantitative study has yet compared the extent of decompression achieved by an endoscopic endonasal versus transcranial approach. OBJECTIVE: Toward this aim, our morphometric analysis compared both approaches by quantifying the circumferential degree of optic canal decompression that is possible before any meningeal violation, which would result in cerebrospinal fluid (CSF) leak...
May 3, 2017: Operative Neurosurgery (Hagerstown, Md.)
https://www.readbyqxmd.com/read/29137056/optic-nerve-injury-associated-blunt-cerebrovascular-injury-three-case-reports
#3
Dan-Dong Li, Liu-Xun Hu, Linyuan Sima, Shang-Yu Xu, Jian Lin, Nu Zhang, Bo Yin
RATIONALE: Blunt cerebrovascular injury (BCVI) is a rare complication that may occur after craniocervical trauma. The current literature is limited to extracranial carotid artery injuries; however, no reports have been published on blunt intracranial carotid injury (BICI), especially those associated with optic nerve injury. PATIENT CONCERNS: Here we report on 3 BICI cases that demonstrated optic nerve injuries after craniofacial injuries. All 3 patients showed post-trauma vision loss on the injured side...
November 2017: Medicine (Baltimore)
https://www.readbyqxmd.com/read/29117278/diurnal-variations-in-the-morphology-of-schlemm-s-canal-and-intraocular-pressure-in-healthy-chinese-an-ss-oct-study
#4
Kai Gao, Fei Li, Tin Aung, Xiulan Zhang
Purpose: To characterize the diurnal variations in the dimensions of the Schlemm's canal (SC) and its association with intraocular pressure (IOP) using swept-source optical coherence tomography (SS-OCT). Methods: The temporal, nasal, inferior, and superior limbus of 102 eyes of 51 healthy subjects were imaged in vivo by SS-COT at 5 time points of 8 AM, 11 AM, 2 PM, 5 PM, and 8 PM. IOP was measured at the same time by Goldmann applanation tonometry (GAT). The diameter and the cross-sectional area of the SC were measured in ImageJ...
November 1, 2017: Investigative Ophthalmology & Visual Science
https://www.readbyqxmd.com/read/29114316/pure-intra-optic-canal-schwannoma-report-of-two-cases
#5
Sayuru Miyamura, Satoshi Yamaguchi, Masaaki Takeda, Takafumi Mitsuhara, Masahiro Hosogai, Kazuhiko Sugiyama, Kaoru Kurisu
We report two cases of "pure intra-optic-canal schwannoma." The first patient was a 67-year-old female who presented with a visual field defect and visual impairment in the right eye, and the second patient was a 17-year-old female with progressive visual impairment. Both patients underwent tumor resection through frontotemporal craniotomy combined with extradural anterior clinoidectomy and unroofing of the optic canal. The tumors were not attached to the optic nerve (ON) and were located exclusively inside the optic canal...
October 2017: Asian Journal of Neurosurgery
https://www.readbyqxmd.com/read/29106310/comparison-of-microtomography-and-optical-coherence-tomography-on-apical-endodontic-filling-analysis
#6
Fernanda Clotilde Mariz Suassuna, Ana Marly Araújo Maia, Daniela Pita Melo, Antônio Celso Dantas Antonino, Anderson Stevens Leônidas Gomes, Patrícia Meira Bento
OBJECTIVES: To comparein vitro differences in the apical filling regarding working length (WL) change and presence of voids and to validate optical coherence tomography (OCT) in comparison with computerized microtomography (µCT) for the detection of failures in the apical filling. METHODS: Forty-five uniradicular teeth with round canals, divided into groups (n = 15) following the obturation protocols: LC (lateral condensation), TMC (thermomechanical compaction) and SC (single cone)...
November 16, 2017: Dento Maxillo Facial Radiology
https://www.readbyqxmd.com/read/29103273/a-case-of-engorged-female-hard-tick-in-the-external-auditory-canal-of-an-infant
#7
Woo-Jung Sung, Yee-Hyuk Kim
An oval-shaped mass with a smooth surface was found in the ear canal of a 22-month-old male infant. Although the mass appeared to be almost entirely blocking the ear canal, it was successfully removed under a surgical microscope without general anesthesia at the outpatient department. Under an optical microscope with hematoxylin and eosin staining, the specimen was observed to have a cuticle with a serrated surface and a pore canal, as well as parts of the capitulum, salivary glands, muscles, midgut, and the legs...
October 2017: Korean Journal of Parasitology
https://www.readbyqxmd.com/read/29077522/a-novel-uveolymphatic-drainage-pathway-possible-new-target-for-glaucoma-treatment
#8
Martyna Tomczyk-Socha, Anna Turno-Kręcicka
Glaucoma is a heterogeneous group of ophthalmic diseases leading to irreversible damage to the optic nerve. While the overall mechanism responsible for glaucoma remains obscure, the most important risk factor is elevated intraocular pressure. The current therapies, whether pharmacological or surgical, are primarily symptomatic with the aim to lower the intraocular pressure (IOP). Poorer response to treatment is associated, for example, with pseudoexfoliation glaucoma, which is determined by blocking the trabecular meshwork (TM) both by pigment grains and the pseudoexfoliation material...
October 27, 2017: Lymphatic Research and Biology
https://www.readbyqxmd.com/read/29063474/dispersion-of-near-infrared-laser-energy-through-radicular-dentine-when-using-plain-or-conical-tips
#9
Christine Yi Jia Teo, Roy George, Laurence J Walsh
The aim of this study was to investigate the influence of tip design on patterns of laser energy dispersion through the dentine of tooth roots when using near-infrared diode lasers. Diode laser emissions of 810 or 940 nm were used in combination with optical fiber tips with either conventional plain ends or conical ends, to irradiate tooth roots of oval or round cross-sectional shapes. The lasers were operated in continuous wave mode at 0.5 W for 5 s with the distal end of the fiber tip placed in the apical or coronal third of the root canal at preset positions...
October 23, 2017: Lasers in Medical Science
https://www.readbyqxmd.com/read/29040698/clinical-outcome-after-endoscopic-endonasal-resection-of-tuberculum-sella-meningiomas
#10
Khaled Elshazly, Varun R Kshettry, Christopher J Farrell, Gurston Nyquist, Marc Rosen, James J Evans
BACKGROUND: In select cases, the endoscopic endonasal approach (EEA) has distinct advantages for resection of tuberculum sella meningiomas (TSM). OBJECTIVE: To report the extent of resection (EOR), complication rates, and outcomes in a large series of TSM treated by the EEA. METHODS: Twenty-five consecutive TSM cases treated by EEA from 2008 to 2016 were retrospectively reviewed. Patient history, imaging, volumetric EOR, complications, and outcomes are presented...
October 10, 2017: Operative Neurosurgery (Hagerstown, Md.)
https://www.readbyqxmd.com/read/29032817/comparison-of-alterations-in-the-surface-topographies-of-hyflex-cm-and-hyflex-edm-nickel-titanium-files-after-root-canal-preparation-a-three-dimensional-optical-profilometry-study
#11
Gülşah Uslu, Taha Özyürek, Koray Yılmaz
AIMS: The aims of the present study were to examine the surface topographies of intact HyFlex CM and HyFlex EDM nickel-titanium files and to compare alterations in the surface topographies of these files after root canal preparation of severely curved canals of molar teeth. METHODS: Eight HyFlex CM (25/.08) and 8 HyFlex EDM (25/.08) files were included in the present study. In total, 64 severely curved canals of molar teeth, with curvature angles ranging between 50° and 70°, were prepared with HyFlex CM and EDM (n = 32 in each group)...
October 9, 2017: Journal of Endodontics
https://www.readbyqxmd.com/read/29019548/noncontact-three-dimensional-evaluation-of-surface-alterations-and-wear-in-niti-endodontic-instruments
#12
Fabiano Guerra Ferreira, Igor Bastos Barbosa, Pantaleo Scelza, Marcello Bulhões Montagnana, Daniel Russano, John Neff, Miriam Zaccaro Scelza
The aim of this study was to undertake a qualitative and quantitative assessment of nanoscale alterations and wear on the surfaces of nickel-titanium (NiTi) endodontic instruments, before and after use, through a high-resolution, noncontact, three-dimensional optical profiler, and to verify the accuracy of the evaluation method. Cutting blade surfaces of two different brands of NiTi endodontic instruments, Reciproc R25 (n = 5) and WaveOne Primary (n = 5), were examined and compared before and after two uses in simulated root canals made in clear resin blocks...
September 28, 2017: Brazilian Oral Research
https://www.readbyqxmd.com/read/28991099/nonsurgical-management-of-retained-needlefish-jaw
#13
Clarissa Kum, Jessica R Chang, Anna M Gruener, Timothy J McCulley
While scuba diving, the left medial canthus of a 53-year-old man was pierced by a needlefish. He immediately lost vision in his left eye. An orbital computed tomographic scan showed the needlefish jaw in the left optic canal. The left medial orbit was explored surgically but no foreign object was removed. One month later, MRI confirmed the presence of the retained needlefish jaw. A conservative approach was taken and the patient remained stable over 3 months of follow-up.
October 4, 2017: Journal of Neuro-ophthalmology: the Official Journal of the North American Neuro-Ophthalmology Society
https://www.readbyqxmd.com/read/28973327/estimating-human-trabecular-meshwork-stiffness-by-numerical-modeling-and-advanced-oct-imaging
#14
Ke Wang, Murray A Johnstone, Chen Xin, Shaozhen Song, Steven Padilla, Janice A Vranka, Ted S Acott, Kai Zhou, Stephen A Schwaner, Ruikang K Wang, Todd Sulchek, C Ross Ethier
Purpose: The purpose of this study was to estimate human trabecular meshwork (hTM) stiffness, thought to be elevated in glaucoma, using a novel indirect approach, and to compare results with direct en face atomic force microscopy (AFM) measurements. Methods: Postmortem human eyes were perfused to measure outflow facility and identify high- and low-flow regions (HF, LF) by tracer. Optical coherence tomography (OCT) images were obtained as Schlemm's canal luminal pressure was directly manipulated...
September 1, 2017: Investigative Ophthalmology & Visual Science
https://www.readbyqxmd.com/read/28967317/extradural-clinoidectomy-for-resection-of-clinoidal-meningioma
#15
Simon Buttrick, Jacques J Morcos, Mohamed S Elhammady, Anthony C Wang
Extradural anterior clinoidectomy is a versatile technique to increase exposure of the sellar and parasellar region. It is of particular use in the resection of clinoidal meningiomas, as sphenoidal and clinoidal hyperostosis can cause compression of the optic nerve. Extradural clinoidectomy follows a series of steps, consisting of (1) unroofing of the superior orbital fissure, (2) unroofing of the optic canal, (3) removal of the optic strut, and (4) removal of the anterior clinoid process. The authors show these steps in detail, as well as their application to the resection of a large clinoidal meningioma...
October 2017: Neurosurgical Focus
https://www.readbyqxmd.com/read/28958926/emergency-optic-canal-decompression-for-vision-salvage-in-fibrous-dysplasia-a-case-report
#16
Reem Elwy, Murat Gokden, Rongsheng Cai
BACKGROUND: The most common neurological manifestations of fibrous dysplasia (FD) are vision and hearing loss. Optic decompression for progressive vision loss has been shown to yield positive results in terms of visual outcomes, however, emergency optic decompression surgery for sudden loss of vision in FD has not to date been reported in the pediatric population. We report the first case of FD presenting with sudden vision loss and successfully managed with emergency optic decompression...
September 26, 2017: World Neurosurgery
https://www.readbyqxmd.com/read/28951179/clinical-outcomes-with-transcranial-resection-of-tuberculum-sellae-meningioma
#17
Michael Karsy, Amol Raheja, Ilyas Eli, Jian Guan, William T Couldwell
OBJECTIVE: The tuberculum sellae is a relatively common location for meningiomas. We assessed our experience with the use of the transcranial resection, which, while criticized for its more invasive nature compared with endonasal approaches, may be the ideal approach in selected patients with tuberculum sellae meningiomas (TSMs). METHODS: We retrospectively reviewed the charts of patients with TSMs that were treated by frontotemporal or bifrontal open cranial resection...
September 22, 2017: World Neurosurgery
https://www.readbyqxmd.com/read/28924145/a-novel-mouse-model-of-traumatic-optic-neuropathy-using-external-ultrasound-energy-to-achieve-focal-indirect-optic-nerve-injury
#18
Wensi Tao, Galina Dvoriantchikova, Brian C Tse, Steven Pappas, Tsung-Han Chou, Manuel Tapia, Vittorio Porciatti, Dmitry Ivanov, David T Tse, Daniel Pelaez
Traumatic optic neuropathy (TON) is a devastating cause of permanent visual loss following blunt injury to the head. Animal models for TON exist, but most fail to recapitulate the clinical scenario of closed head indirect trauma to the nerve and subsequent neurodegeneration. Thus, we developed a clinically-relevant animal model for TON using a novel ultrasonic pulse injury modality (sonication-induced TON; SI-TON). To trigger TON, a microtip probe sonifier was placed on the supraorbital ridge directly above the entrance of the optic nerve into the bony canal...
September 18, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28913313/a-statistical-analysis-of-superior-orbital-fissure-width-in-korean-adults-using-computed-tomography-scans
#19
Yongsik Park, Youngjoon Kim
BACKGROUND: The superior orbital fissure is a small area that connects the middle cranial fossa and the orbit. Many studies have measured the size of the superior orbital fissure. However, there is no standard value for the size of the superior orbital fissure. Therefore, we conducted this study to provide the average size of the superior orbital fissure in Korean adults. METHODS: We measured the widths of the superior orbital fissures of 142 patients using computed tomography scans...
June 2017: Arch Craniofac Surg
https://www.readbyqxmd.com/read/28912278/pituitary-macroadenoma-and-visual-impairment-postoperative-outcome-prediction-with-contrast-enhanced-fiesta
#20
S Hisanaga, S Kakeda, J Yamamoto, K Watanabe, J Moriya, T Nagata, Y Fujino, H Kondo, S Nishizawa, Y Korogi
BACKGROUND AND PURPOSE: Contrast-enhanced FIESTA can depict anterior optic pathways in patients with large suprasellar tumors. We assessed whether the degree of kink in the optic nerve at the optic canal orifice on contrast-enhanced FIESTA correlates with the postoperative improvement of visual impairment in patients with pituitary macroadenoma. MATERIALS AND METHODS: Thirty-one patients with pituitary macroadenoma who underwent preoperative MR imaging and an operation were evaluated...
September 14, 2017: AJNR. American Journal of Neuroradiology
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