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https://www.readbyqxmd.com/read/28441687/c-arm-positioning-is-a-significant-source-of-radiation-in-spine-surgery
#1
Elizabeth W Reiser, Rupen Desai, Sarah A Byrd, Harrison Farber, Deborah Chi, Cary S Idler, Robert E Isaacs
STUDY DESIGN: Prospective chart review. OBJECTIVE: It is well-known that radiation exposure during minimally invasive spine procedures can be substantial. Less interest has focused on setup radiation exposure before incision, including preoperative images used for surgical approach. The present study seeks to better quantify the significance of setup radiation in the total radiation exposure of minimally invasive spine surgery. SUMMARY OF BACKGROUND DATA: Radiographic localization is necessary in minimally invasive spine procedures to visualize anatomy, but increased radiation exposure is associated with health risks...
May 1, 2017: Spine
https://www.readbyqxmd.com/read/28441680/magnetic-resonance-imaging-safety-of-magnetically-controlled-growing-rods-in-an-in-vivo-animal-model
#2
Mehmet Eroglu, Gokhan Demirkiran, Ismail Aykut Kocyigit, Hasan Bilgili, Mehmet Burak Kaynar, Ali Bumin, Sadan Ozcan, Muharrem Yazici
STUDY DESIGN: Experimental animal study. OBJECTIVE: To investigate the interaction between magnetically controlled growing rods (MCGRs) and magnetic resonance imaging (MRI). SUMMARY OF BACKGROUND DATA: Growing rod treatment through serial operations results in adverse effects on the patient and high treatment costs. MCGRs can be lengthened noninvasively in an outpatient setting and with lower treatment costs. When MRI investigation is required, the interaction between MCGRs and MRI is an issue of concern in patients with MCGRs...
May 1, 2017: Spine
https://www.readbyqxmd.com/read/28441310/a-dose-response-curve-for-a-gram-negative-spinal-implant-infection-model-in-rabbits
#3
Joseph L Laratta, Jamal N Shillingford, Nathan Hardy, Ronald A Lehman, Lawrence G Lenke, K Daniel Riew
STUDY DESIGN: Randomized complete block animal spinal implant infection model with internal control. OBJECTIVE: To develop a spinal implant animal infection model to simulate postoperative gram-negative wound infection. SUMMARY OF BACKGROUND DATA: Implant-associated surgical site infections (SSI) remain a dreaded complication of spinal surgery. Currently, over 30% of all spine SSIs are secondary to gram-negative bacteria. Traditional animal models have utilized gram-positive inoculums to simulate postoperative infection, but there exists no model in the literature for gram-negative infection in the setting of spinal instrumentation...
April 24, 2017: Spine
https://www.readbyqxmd.com/read/28440860/doppler-ultrasonographic-measurement-of-short-term-effects-of-valsalva-maneuver-on-retrobulbar-blood-flow
#4
Sabit Kimyon, Ahmet Mete, Alper Mete, Duçem Mete
BACKGROUND: To investigate the effects of Valsalva maneuver (VM) on retrobulbar blood flow parameters in healthy subjects. METHODS: Participants without any ophthalmologic or systemic pathology were examined in supine position with color and pulsed Doppler imaging for blood flow measurement, via a paraocular approach, in the ophthalmic artery (OA), central retinal artery (CRA), central retinal vein (CRV), nasal posterior ciliary artery (NPCA), and temporal posterior ciliary artery (TPCA), 10 seconds after a 35- to 40-mm Hg expiratory pressure was reached...
April 25, 2017: Journal of Clinical Ultrasound: JCU
https://www.readbyqxmd.com/read/28439662/the-angular-gyrus-is-a-supramodal-comparator-area-in-action-outcome-monitoring
#5
Bianca M van Kemenade, B Ezgi Arikan, Tilo Kircher, Benjamin Straube
Predicting and processing the sensory consequences of one's own actions is essential to enable successful interactions with the environment. Previous studies have suggested that the angular gyrus detects discrepancies between predicted and actual action consequences, at least for unimodal feedback. However, most actions lead to multisensory consequences, raising the question whether previous models can sufficiently explain action-outcome processing. Here, we investigated neural comparator processes during detection of delays between action and unimodal or bimodal consequences in human subjects with fMRI, using parametric and connectivity analyses...
April 24, 2017: Brain Structure & Function
https://www.readbyqxmd.com/read/28439199/comparison-of-methods-and-formulas-used-in-umbilical-venous-catheter-placement
#6
Mehmet Mutlu, Burcu Küçükalioğlu Parıltan, Yakup Aslan, İlker Eyüpoğlu, Şebnem Kader, Filiz Acar Aktürk
AIM: Central venous access is frequently provided by way of umbilical venous catheter placement in critically ill newborns. This study compared the methods of Dunn, Shukla-Ferrara, and Revised Shukla-Ferrara in determining the appropriate insertion length of umbilical vein catheters. MATERIAL AND METHODS: This prospective observational study was carried out in 121 newborns with umbilical venous catheter, group 1 (n=41) used Dunn method, group 2 (n=40) used the Shukla-Ferrara formula, and group 3 used revised Shukla-Ferrara formula (n=40)...
March 2017: Türk Pediatri Arşivi
https://www.readbyqxmd.com/read/28438414/predictors-of-trachomatous-trichiasis-surgery-outcome
#7
Esmael Habtamu, Tariku Wondie, Sintayehu Aweke, Zerihun Tadesse, Mulat Zerihun, Bizuayehu Gashaw, Guadie S Wondimagegn, Hiwot D Mengistie, Saul N Rajak, Kelly Callahan, Helen A Weiss, Matthew J Burton
PURPOSE: Unfavorable outcomes after trachomatous trichiasis (TT) surgery are undermining the global trachoma elimination effort. This analysis investigates predictors of postoperative TT (PTT), eyelid contour abnormalities (ECAs), and granuloma in the 2 most common TT surgery procedures: posterior lamellar tarsal rotation (PLTR) and bilamellar tarsal rotation (BLTR). DESIGN: Secondary data analysis from a randomized, controlled, single-masked clinical trial. PARTICIPANTS: A total of 1000 patients with TT, with lashes touching the eye or evidence of epilation, in association with tarsal conjunctival scarring...
April 21, 2017: Ophthalmology
https://www.readbyqxmd.com/read/28437758/balance-impairment-in-kidney-transplant-recipients-without-concurrent-peripheral-neuropathy
#8
T Zanotto, S Gobbo, V Bullo, B Vendramin, F Duregon, L Cugusi, A Di Blasio, L Furian, C Silvestre, D Neunhaeuserer, M Zaccaria, M Bergamin, A Ermolao
Kidney transplant recipients (KTRs) present with compromised functional capacity, low levels of physical activity, muscle atrophy, and peripheral nerve dysfunction that may result in high postural instability. This study aimed to compare the static balance control of 19 KTRs with 19 healthy adults (HA). All participants completed the Romberg test on a stabilometric platform with eyes open (EO), eyes closed (EC) and during a dual task (DT) condition. Centre of pressure (COP) measures (COP velocity (COPv) and sway area (SA)), as well as position-based outcomes such as anterior-posterior (AP) and medio-lateral (ML) ranges of COP displacements were recorded...
April 15, 2017: Gait & Posture
https://www.readbyqxmd.com/read/28437502/combined-anterior-posterior-decompression-and-fusion-for-cervical-spondylotic-myelopathy
#9
Richard Bram, Susan Fiore, John J Labiak, Raphael P Davis
We conducted a study to evaluate the operative details, perioperative complications, and short-term outcomes associated with combined anterior-posterior decompression and fusion (CAPDF) for treating cervical spondylotic myelopathy (CSM). We retrospectively reviewed the charts of 21 patients who underwent CAPDF at our institution. Pertinent information, including demographics, surgery indication, perioperative complications, operative time, levels fused (and number of levels fused) anteriorly and posteriorly, estimated blood loss, and length of stay, was gathered...
March 2017: American Journal of Orthopedics
https://www.readbyqxmd.com/read/28437345/accuracy-of-iliac-screws-insertion-in-adult-spinal-deformity-surgery-relationship-between-misplacement-and-the-iliac-morphologies
#10
Tomohiro Banno, Tsuyoshi Ohishi, Tomohiko Hasegawa, Yu Yamato, Sho Kobayashi, Daisuke Togawa, Tatsuya Yasuda, Yukihiro Matsuyama
STUDY DESIGN: Retrospective study. OBJECTIVE: To investigate the accuracy of freehand iliac screw insertion and to determine how this can be performed safely. BACKGROUND AND METHODS: Seventy-seven adult scoliosis patients with an average age of 70.1 years who underwent spinal deformity surgery with spinopelvic fixation using bilateral iliac screws were enrolled. Penetration of the iliac table was assessed using postoperative computed tomography...
May 2017: Clinical Spine Surgery
https://www.readbyqxmd.com/read/28437330/pedicle-screw-fluid-sign-an-indication-on-magnetic-resonance-imaging-of-a-deep-infection-after-posterior-spinal-instrumentation
#11
Hiroaki Kimura, Jitsuhiko Shikata, Seiichi Odate, Tsunemitsu Soeda
STUDY DESIGN: A single-center case-referent study. OBJECTIVE: To assess whether the "pedicle screw (PS) fluid sign" on magnetic resonance imaging (MRI) can be used to diagnose deep surgical site infection (SSI) after posterior spinal instrumentation (PSI). SUMMARY OF BACKGROUND DATA: MRI is a useful tool for the early diagnosis of a deep SSI. However, the diagnosis is frequently difficult with feverish patients with clear wounds after PSI because of artifacts from the metallic implants...
May 2017: Clinical Spine Surgery
https://www.readbyqxmd.com/read/28434958/microsurgical-resection-following-failed-gamma-knife-radiosurgery-of-papillary-tumor-of-the-pineal-gland
#12
Anil Nanda, Piyush Kalakoti, Devi Prasad Patra, Tanmoy Maiti, Hai Sun
Primary papillary tumors of the pineal region (PTPR) are rare entities with distinct histopathological characteristics. Most common surgical approaches include the supra-cerebellar infratentorial corridor or the occipital interhemispheric approach. Gamma knife radiosurgery (GKRS) is an acceptable treatment modality for parenchymal tumors of the pineal gland, and often used as a primary treatment modality for asymptomatic and indolent lesions, and as an adjunct to surgical resection. In this presentation, we describe the surgical nuances of posterior interhemispheric approach in an elderly male with a previously failed empirical GKRS...
April 18, 2017: World Neurosurgery
https://www.readbyqxmd.com/read/28433848/instrumented-circumferential-fusion-in-two-stages-for-instable-lumbar-fracture-long-term-results-of-a-series-of-74-patients-on-sagittal-balance-and-functional-outcomes
#13
Mourad Ould-Slimane, Camille Damade, Guillaume Lonjon, André Gilibert, Jérôme Cochereau, Rémi Gauthé, Nicolas Lonjon
AIM: To report the radiological and functional results of a multicentre, prospective case series of patients with comminuted lumbar fractures treated with two-stage circumferential arthrodesis. METHODS: A multicentre, prospective case series of 74 patients with comminuted lumbar fractures was analyzed. The strategy entailed initial posterior osteosynthesis then physical replacement with an expandable titanium cage filled with autologous bone, via retroperitoneal lumbotomy...
April 19, 2017: World Neurosurgery
https://www.readbyqxmd.com/read/28433482/variations-of-target-volume-definition-and-daily-target-volume-localization-in-stereotactic-body-radiotherapy-for-early-stage-non-small-cell-lung-cancer-patients-under-abdominal-compression
#14
Chunhui Han, Sagus Sampath, Timothy E Schultheisss, Jeffrey Y C Wong
We aimed to compare gross tumor volumes (GTV) in 3-dimensional computed tomography (3DCT) simulation and daily cone beam CT (CBCT) with the internal target volume (ITV) in 4-dimensional CT (4DCT) simulation in stereotactic body radiotherapy (SBRT) treatment of patients with early-stage non-small cell lung cancer (NSCLC) under abdominal compression. We retrospectively selected 10 patients with NSCLC who received image-guided SBRT treatments under abdominal compression with daily CBCT imaging. GTVs were contoured as visible gross tumor on the planning 3DCT and daily CBCT, and ITVs were contoured using maximum intensity projection (MIP) images of the planning 4DCT...
April 19, 2017: Medical Dosimetry: Official Journal of the American Association of Medical Dosimetrists
https://www.readbyqxmd.com/read/28433391/mechanisms-of-anterior-posterior-stability-of-the-knee-joint-under-load-bearing
#15
Ryan J Reynolds, Peter S Walker, John Buza
The anterior-posterior (AP) stability of the knee is an important aspect of functional performance. Studies have shown that the stability increases when compressive loads are applied, as indicated by reduced laxity, but the mechanism has not been fully explained. A test rig was designed which applied combinations of AP shear and compressive forces, and measured the AP displacements relative to the neutral position. Five knees were evaluated at compressive loads of 0, 250, 500, and 750N, with the knee at 15° flexion...
April 7, 2017: Journal of Biomechanics
https://www.readbyqxmd.com/read/28432565/parapharyngodon-hugoi-n-sp-a-new-nematode-oxyuroidea-pharyngodonidae-of-the-tree-frog-trachycephalus-typhonius-linnaeus-from-the-brazilian-pantanal-including-a-key-to-the-congeners-from-amphibians-of-the-american-continent
#16
Felipe B Pereira, Karla M Campião, José L Luque, Luiz E R Tavares
A new nematode Parapharyngodon hugoi n. sp. (Oxyuroidea: Pharyngodonidae) is described parasitising the large intestine of the tree frog Trachycephalus typhonius (Linnaeus) (Anura: Hylidae) from the wetlands of Pantanal, State of Mato Grosso do Sul, Brazil. The new species exhibits a unique structure of the posterior cloacal lip in males, which is supported by a rigid V-shaped structure. Parapharyngodon hylidae parasitic in hylid frogs, including T. typhonius, from Mexico, is the most similar congener to P...
April 21, 2017: Systematic Parasitology
https://www.readbyqxmd.com/read/28432384/the-probability-of-object-scene-co-occurrence-influences-object-identification-processes
#17
Geneviève Sauvé, Mariane Harmand, Léa Vanni, Mathieu B Brodeur
Contextual information allows the human brain to make predictions about the identity of objects that might be seen and irregularities between an object and its background slow down perception and identification processes. Bar and colleagues modeled the mechanisms underlying this beneficial effect suggesting that the brain stocks information about the statistical regularities of object and scene co-occurrence. Their model suggests that these recurring regularities could be conceptualized along a continuum in which the probability of seeing an object within a given scene can be high (probable condition), moderate (improbable condition) or null (impossible condition)...
April 21, 2017: Experimental Brain Research. Experimentelle Hirnforschung. Expérimentation Cérébrale
https://www.readbyqxmd.com/read/28431842/significance-of-intraoperative-findings-in-revision-tympanomastoidectomy
#18
Andro Košec, Iva Kelava, Jakov Ajduk, Mihael Ries, Robert Trotić, Vladimir Bedeković
PURPOSE: The study was designed to assess correlations between intraoperative findings in revision tympanomastoidectomy as predictors of cholesteatoma recurrence. MATERIALS AND METHODS: A retrospective single-institution cohort of 101 patients who underwent surgical treatment for recurrent chronic otitis media in a tertiary referral otology centre. RESULTS: Out of 101 patients, 65 had canal wall up and 36 canal wall down revision surgery. There were 35 cholesteatoma recurrences...
April 12, 2017: American Journal of Otolaryngology
https://www.readbyqxmd.com/read/28431561/the-evaluation-of-the-role-of-medial-collateral-ligament-maintaining-knee-stability-by-a-finite-element-analysis
#19
Dong Ren, Yueju Liu, Xianchao Zhang, Zhaohui Song, Jian Lu, Pengcheng Wang
BACKGROUND: A three-dimensional finite element model (FEM) of the knee joint was established to analyze the biomechanical functions of the superficial and deep medial collateral ligaments (MCLs) of knee joints and to investigate the treatment of the knee medial collateral ligament injury. METHODS: The right knee joint of a healthy male volunteer was subjected to CT and MRI scans in the extended position. The scanned data were imported into MIMICS, Geomagic, and ANSYS software to establish a three-dimensional FEM of the human knee joint...
April 21, 2017: Journal of Orthopaedic Surgery and Research
https://www.readbyqxmd.com/read/28431410/gravity-stress-radiographs-and-the-effect-of-ankle-position-on-deltoid-ligament-integrity-and-medial-clear-space-measurements
#20
Ali Ashraf, Jacob Murphree, Eric Wait, Travis Winston, Adam Wooldridge, Matthew Meriwether, Joshua Wilson, Jerry S Grimes
INTRODUCTION: External rotation and gravity stress radiographs have been described to distinguish stable supination-external rotation-II (SER-II) ankle fractures from unstable SER-IV fractures. It has been previously shown that both external rotation and gravity stress views are equivalent in their ability to diagnose deltoid ligament injury. It has also been shown that the position of the ankle influences the external rotation stress radiograph. However, no data of ankle position exist for gravity stress radiographs...
May 2017: Journal of Orthopaedic Trauma
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