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https://www.readbyqxmd.com/read/27900292/hypoxia-inhibits-primary-cilia-formation-and-reduces-cell-mediated-contraction-in-stress-deprived-rat-tail-tendon-fascicles
#1
Michael Lavagnino, Anna N Oslapas, Keri L Gardner, Steven P Arnoczky
BACKGROUND: Hypoxia, which is associated with chronic tendinopathy, has recently been shown to decrease the mechanosensitivity of some cells. Therefore, the purpose of this study was to determine the effect of hypoxia on the formation of elongated primary cilia (a mechanosensing organelle of tendon cells) in vitro and to determine the effect of hypoxia on cell-mediated contraction of stress-deprived rat tail tendon fascicles (RTTfs). METHODS: Tendon cells isolated from RTTfs were cultured under normoxic (21% O2) or hypoxic (1% O2) conditions for 24 hours...
April 2016: Muscles, Ligaments and Tendons Journal
https://www.readbyqxmd.com/read/27898383/influence-of-anatomical-detail-and-tissue-conductivity-variations-in-simulations-of-multi-contact-nerve-cuff-recordings
#2
Purbasha Garai, Ryan G L Koh, Martin Schuettler, Thomas Stieglitz, Jose Zariffa
Accurate simulations of peripheral nerve recordings are needed to develop improved neuroprostheses. Previous models of peripheral nerves contained simplifications whose effects have not been investigated. We created a novel detailed finite element (FE) model of a peripheral nerve, and used it to carry out a sensitivity analysis of several model parameters. To construct the model, in vivo recordings were obtained in a rat sciatic nerve using an 8-channel nerve cuff electrode, after which the nerve was imaged using magnetic resonance imaging (MRI)...
November 24, 2016: IEEE Transactions on Neural Systems and Rehabilitation Engineering
https://www.readbyqxmd.com/read/27897312/the-feasibility-of-micro-ultrasound-as-a-tool-to-image-peripheral-nerves
#3
A Chandra, R Eisma, P Felts, S Munirama, G A Corner, C E M Demore, G McLeod
Despite widespread use of ultrasound imaging to guide needle placement, the incidence of transient and permanent nerve damage as a complication of regional anaesthesia has not changed over the last decade. In view of the controversy surrounding intraneural injection there is a need to understand the structural changes caused by subepineural and subperineural needle penetration. Clinical ultrasound machines do not provide adequate anatomical resolution, and anaesthetists have difficulty judging the precise location of the needle tip relative to the epineurium...
November 29, 2016: Anaesthesia
https://www.readbyqxmd.com/read/27894277/human-limb-skeletal-muscle-wasting-and-architectural-remodeling-during-five-to-ten-days-intubation-and-ventilation-in-critical-care-an-observational-study-using-ultrasound
#4
Peter Turton, Richard Hay, Jonathon Taylor, Jamie McPhee, Ingeborg Welters
BACKGROUND: Critically ill patients frequently suffer muscle weakness whilst in critical care. Ultrasound can reliably track loss of muscle size, but also quantifies the arrangement of the muscle fascicles, known as the muscle architecture. We sought to measure both pennation angle and fascicle length, as well as tracking changes in muscle thickness in a population of critically ill patients. METHODS: On days 1, 5 and 10 after admission to critical care, muscle thickness was measured in ventilated critically ill patients using bedside ultrasound...
November 29, 2016: BMC Anesthesiology
https://www.readbyqxmd.com/read/27888083/clinical-and-imaging-evaluation-of-the-transuncus-selective-amygdalo-hippocampectomy
#5
Enrico Ghizoni, Roger Matias, Stefan Lieber, Brunno Machado de Campos, Clarissa Lin Yasuda, João Paulo Sant Ana Santos de Souza, Pamela Castro Pereira, Augusto Amato, Andrei Fernandes Joaquim, Tátila Martins Lopes, Helder Tedeschi, Fernando Cendes
BACKGROUND: Various reports described the transuncus approach (TU) as a selective route to the amygdala and hippocampus, but this approach has not yet being submitted to a solid post operative imaging analysis. The objective of this study was to evaluate the anatomy, surgical technique, postoperative imaging analysis and outcome in a series of temporal lobe epilepsy (TLE) patients who underwent to selective amigdalo-hippocampectomy (SHA) via TU. METHODS: This is a prospective study of 25 consecutive patients who underwent to selective amigdalo-hippocampectomy through TU...
November 22, 2016: World Neurosurgery
https://www.readbyqxmd.com/read/27881610/primary-leiomyosarcoma-of-the-ovarian-vein-case-report-and-literature-review
#6
María Elena López-Ruiz, Laura Yébenes, Alberto Berjón, David Hardisson
Primary leiomyosarcoma arising from the ovarian vein is extremely rare, with only 10 cases reported in the literature. We report on a case of leiomyosarcoma of the left ovarian vein in a 67-year-old woman who presented with abdominal discomfort. Pelvic ultrasound revealed a large, solid, irregular mass in close relation to the left ovary. The patient subsequently underwent a total hysterectomy with bilateral salpingo-oophorectomy. Histologically, the tumor was composed of interlacing fascicles of spindle cells with abundant eosinophilic cytoplasm, hyperchromatic nuclei, and prominent nucleoli...
November 23, 2016: International Journal of Surgical Pathology
https://www.readbyqxmd.com/read/27878991/crimp-length-decreases-in-lax-tendons-due-to-cytoskeletal-tension-but-is-restored-with-tensional-homeostasis
#7
Michael Lavagnino, Andrew E Brooks, Anna N Oslapas, Keri L Gardner, Steven P Arnoczky
Collagen crimp morphology is thought to contribute to the material behavior of tendons and may reflect the local mechanobiological environment of tendon cells. Following loss of collagen tension in tendons, tenocytes initiate a contraction response that shortens tendon length which, in turn, may alter crimp patterns. We hypothesized that changes in the crimp pattern of tendons are the result of cell-based contractions which are governed by relative tautness/laxity of the collagen matrix. To determine the relationship between crimp pattern and tensional homeostasis, rat tail tendon fascicles (RTTfs) were either allowed to freely contract or placed in clamps with 10% laxity for 7 days...
November 23, 2016: Journal of Orthopaedic Research: Official Publication of the Orthopaedic Research Society
https://www.readbyqxmd.com/read/27878449/pseudomyogenic-hemangioendothelioma-a-vascular-tumor-previously-undescribed-in-the-oral-cavity
#8
Yeshwant B Rawal, Kenneth M Anderson, Thomas B Dodson
The pseudomyogenic hemangioendothelioma (PMH) is a low-grade malignant vascular neoplasm of different tissue planes including skin and soft tissue. Primary tumors in the skeletal muscle and bone have also been diagnosed. The PMH was introduced into the WHO classification of tumors of soft tissue and bone in 2013. This is the first description of oral involvement. A 21-year-old female presented with a 2-month old swelling of her gingiva. The swelling appeared red in color and was soft in consistency. A clinical diagnosis of a pyogenic granuloma was made and an incisional biopsy was submitted for histopathological evaluation...
November 22, 2016: Head and Neck Pathology
https://www.readbyqxmd.com/read/27864992/the-mri-bullseye-sign-an-indicator-of-peripheral-nerve-constriction-in-parsonage-turner-syndrome
#9
Darryl B Sneag, Eliana B Saltzman, David W Meister, Joseph H Feinberg, Steve K Lee, Scott W Wolfe
INTRODUCTION: Magnetic resonance imaging's (MRI's) role in identifying hourglass constrictions (HGCs) of nerves in Parsonage-Turner syndrome (PTS) is largely unknown. METHODS: Six patients with PTS and with absent or minimal recovery underwent MRI. Surgical exploration was performed at identified pathologic sites. RESULTS: The time between symptom onset and surgery was 12.4 ± 6.9 months; the time between MRI and surgery was 1.3 ± 0...
November 16, 2016: Muscle & Nerve
https://www.readbyqxmd.com/read/27863015/successful-laparoscopic-resection-of-a-retroperitoneal-schwannoma-arising-from-the-femoral-nerve-a-case-report
#10
Tetsuo Ishizaki, Kenji Katsumata, Masanobu Enomoto, Takaaki Matsudo, Masatoshi Shigoka, Masayuki Hisada, Akihiko Tsuchida
We report on a 45-year-old man who presented with pain in the left leg, which he had had for 2 months. A contrast-enhanced CT scan displayed a 25-mm tumor in the lateral side of the left psoas muscle. For this suspected retroperitoneal tumor, we performed laparoscopic resection of the tumor, which was encapsulated by the funicular femoral nerve, using surgical scissors rather than a surgical energy device and preserved the normal fascicles wherever possible. Pathological examination indicated a benign ancient schwannoma arising from the femoral nerve...
November 8, 2016: Asian Journal of Endoscopic Surgery
https://www.readbyqxmd.com/read/27862024/medial-gastrocnemius-specific-force-of-adult-men-with-spastic-cerebral-palsy
#11
Ayser W Hussain, Gladys L Onambele, Alun G Williams, Christopher I Morse
INTRODUCTION: Muscle weakness determines functional impairment in spastic cerebral palsy (SCP). Measurement of specific force (SF) allows for strength comparison with unimpaired populations (controls) accounting for neural (activation and coactivation), architectural (fascicle length and pennation angle), and structural differences (moment arm length). METHODS: Medial gastrocnemius (MG) SF (and its determinants) was assessed in both paretic and non-paretic legs of 11 men with SCP and 11 age-matched controls during plantarflexion maximal voluntary isometric contraction (MVIC)...
November 15, 2016: Muscle & Nerve
https://www.readbyqxmd.com/read/27861847/structural-and-functional-characteristics-of-the-thoracolumbar-multifidus-muscle-in-horses
#12
J A García Liñeiro, G H Graziotti, J M Rodríguez Menéndez, C M Ríos, N O Affricano, C L Victorica
The multifidus muscle fascicles of horses attach to vertebral spinous processes after crossing between one to six metameres. The fascicles within one or two metameres are difficult to distinguish in horses. A vertebral motion segment is anatomically formed by two adjacent vertebrae and the interposed soft tissue structures, and excessive mobility of a vertebral motion segment frequently causes osteoarthropathies in sport horses. The importance of the equine multifidus muscle as a vertebral motion segment stabilizer has been demonstrated; however, there is scant documentation of the structure and function of this muscle...
November 11, 2016: Journal of Anatomy
https://www.readbyqxmd.com/read/27861523/knee-moment-angle-characteristics-and-semitendinosus-muscle-morphology-in-children-with-spastic-paresis-selected-for-medial-hamstring-lengthening
#13
Helga Haberfehlner, Richard T Jaspers, Erich Rutz, Jules G Becher, Jaap Harlaar, Johannes A van der Sluijs, Melinda M Witbreuk, Jacqueline Romkes, Marie Freslier, Reinald Brunner, Huub Maas, Annemieke I Buizer
To increase knee range of motion and improve gait in children with spastic paresis (SP), the semitendinosus muscle (ST) amongst other hamstring muscles is frequently lengthened by surgery, but with variable success. Little is known about how the pre-surgical mechanical and morphological characteristics of ST muscle differ between children with SP and typically developing children (TD). The aims of this study were to assess (1) how knee moment-angle characteristics and ST morphology in children with SP selected for medial hamstring lengthening differ from TD children, as well as (2) how knee moment-angle characteristics and ST morphology are related...
2016: PloS One
https://www.readbyqxmd.com/read/27851717/central-trochlear-palsy-report-of-two-patients-with-ipsilesional-palsy-and-review-of-the-literature
#14
Seong-Hae Jeong, Sung-Hee Kim, Seung-Han Lee, Seong-Ho Park, Hyo-Jung Kim, Ji-Soo Kim
BACKGROUND: The trochlear (fourth) nerve is the only cranial nerve that decussates before emerging from the posterior aspect of the brainstem. Lesions involving the trochlear nucleus or fascicles mostly give rise to contralesional superior oblique palsy (SOP). METHODS: We report 2 patients with SOP on the side of intraaxial lesions with a literature review on central trochlear palsy. RESULTS: The lesions are more commonly located posterior to the cerebral aqueduct in patients with ipsilesional SOP than in those with contralesional SOP...
December 2016: Journal of Neuro-ophthalmology: the Official Journal of the North American Neuro-Ophthalmology Society
https://www.readbyqxmd.com/read/27849292/health-policy-on-the-pages-of-revista-de-sa%C3%A3%C2%BAde-p%C3%A3%C2%BAblica
#15
Aylene Bousquat, Oswaldo Yoshimi Tanaka
We carried out a narrative review of the scientific production in the area of Policy, Planning and Management in Revista de Saúde Pública (RSP), between 1967 and 2015. All the fascicles of RSP, in the period, were accessed via SciELO platform, which provides all articles online. We selected and classified the articles according to the main topics of scientific production in the area of Policy, Planning and Management. Revista de Saúde Pública has published 343 articles on this subject, with significant growth in the last two decades...
November 10, 2016: Revista de Saúde Pública
https://www.readbyqxmd.com/read/27827979/an-age-related-morphometric-profile-of-skeletal-muscle-in-healthy-untrained-women
#16
Anastasia Bougea, George Papadimas, Constantinos Papadopoulos, George P Paraskevas, Nikolaos Kalfakis, Panagiota Manta, Evangelia Kararizou
There is a paucity of data on muscle biopsies in females of mixed ages in terms of age-related changes. Cross sections of autopsy material including the quadriceps femoris and biceps brachii muscles were obtained from 23 healthy women, aged 24-82 years, who had suffered sudden death. We calculated the percentage of the number, and the mean diameter, of type I and type II muscle fibers within the fascicles as well as in their peripheral parts. The number of type II fibers were shown to reduce significantly with age (p < 0...
November 7, 2016: Journal of Clinical Medicine
https://www.readbyqxmd.com/read/27825811/superficial-acral-fibromyxoma-clinicopathologic-immunohistochemical-and-molecular-study-of-11-cases-highlighting-frequent-rb1-loss-deletions
#17
Abbas Agaimy, Michael Michal, Johannes Giedl, Ladislav Hadravsky, Michal Michal
Superficial acral fibromyxoma (SAF) is an uncommon benign dermal mesenchymal lesion of adults with predilection for acral sites, in particular the nail region. To date, <300 cases have been reported. SAFs consistently express CD34 but other diagnostic markers or specific genetic alterations have not been established yet. We describe 11 SAFs occurring in 7 males and 4 females aged 37 to 86years (median, 48). Mean size was 6mm (range, 4-20mm). Affected sites were fingers (n=5), toes (n=3), heel (n=1), calf (n=1) and unspecified digit (n=1)...
November 4, 2016: Human Pathology
https://www.readbyqxmd.com/read/27782563/4d-x-ray-phase-contrast-tomography-for-repeatable-motion-of-biological-samples
#18
Masato Hoshino, Kentaro Uesugi, Naoto Yagi
X-ray phase contrast tomography based on a grating interferometer was applied to fast and dynamic measurements of biological samples. To achieve this, the scanning procedure in the tomographic scan was improved. A triangle-shaped voltage signal from a waveform generator to a Piezo stage was used for the fast phase stepping in the grating interferometer. In addition, an optical fiber coupled x-ray scientific CMOS camera was used to achieve fast and highly efficient image acquisitions. These optimizations made it possible to perform an x-ray phase contrast tomographic measurement within an 8 min scan with density resolution of 2...
September 2016: Review of Scientific Instruments
https://www.readbyqxmd.com/read/27781982/rhomboid-nerve-transfer-to-the-suprascapular-nerve-for-shoulder-reanimation-in-brachial-plexus-palsy-a-clinical-report
#19
J-N Goubier, F Teboul
Recovery of shoulder function is a real challenge in cases of partial brachial plexus palsy. Currently, in C5-C6 root injuries, transfer of the long head of the triceps brachii branch is done to revive the deltoid muscle. Spinal accessory nerve transfer is typically used for reanimation of the suprascapular nerve. We propose an alternative technique in which the nerve of the rhomboid muscles is transferred to the suprascapular nerve. A 33-year-old male patient with a C5-C6 brachial plexus injury with shoulder and elbow flexion palsy underwent surgery 7 months after the injury...
October 2016: Hand Surgery and Rehabilitation
https://www.readbyqxmd.com/read/27780031/microstructural-brain-abnormalities-in-medication-free-patients-with-major-depressive-disorder-a-systematic-review-and-meta-analysis-of-diffusion-tensor-imaging
#20
Jing Jiang, You-Jin Zhao, Xin-Yu Hu, Ming-Ying Du, Zi-Qi Chen, Min Wu, Kai-Ming Li, Hong-Yan Zhu, Poornima Kumar, Qi-Yong Gong
BACKGROUND: Multiple meta-analyses of diffusion tensor imaging (DTI) studies have reported impaired white matter integrity in patients with major depressive disorder (MDD). However, owing to inclusion of medicated patients in these studies, it is difficult to conclude whether these reported alterations are associated with MDD or confounded by medication effects. A meta-analysis of DTI studies on medication-free (medication-naive and medication washout) patients with MDD would therefore be necessary to disentangle MDD-specific effects...
October 25, 2016: Journal of Psychiatry & Neuroscience: JPN
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