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https://www.readbyqxmd.com/read/28079509/excellent-balance-skills-despite-active-and-inactive-juvenile-idiopathic-arthritis-unexpected-results-of-a-cross-sectional-study
#1
Josephine Merker, Matthias Hartmann, Florian Kreuzpointner, Ansgar Schwirtz, Johannes-Peter Haas
OBJECTIVES: Postural control (PC) is fundamental for human movements. Different factors, such as injuries or diseases, can adversely affect PC. The purpose of this study was to evaluate PC in juvenile idiopathic arthritis (JIA) patients with different disease activity levels in comparison to healthy peers. METHODS: JIA patients with active and inactive lower limb joints (n=36 each group) were examined. Both groups have been on medication and have had physiotherapy for at least 5 years...
January 5, 2017: Clinical and Experimental Rheumatology
https://www.readbyqxmd.com/read/28076297/dynamics-of-the-cardiovascular-autonomic-regulation-during-orthostatic-challenge-is-more-relaxed-in-women
#2
Sina Reulecke, Sonia Charleston-Villalobos, Andreas Voss, Ramón González-Camarena, Jesús González-Hermosillo, Mercedes Gaitán-González, Guadalupe Hernández-Pacheco, Rico Schroeder, Tomás Aljama-Corrales
Linear dynamic analysis of cardiovascular and respiratory time series was performed in healthy subjects with respect to gender by shifted short-term segments throughout a head-up tilt (HUT) test. Beat-to-beat intervals (BBI), systolic (SYS) and diastolic (DIA) blood pressure and respiratory interval (RESP) time series were acquired in 14 men and 15 women. In time domain (TD), the descending slope of the auto-correlation function (ACF) (BBI_a31cor) was more pronounced in women than in men (p<0.05) during the HUT test and considerably steeper (p<0...
January 11, 2017: Biomedizinische Technik. Biomedical Engineering
https://www.readbyqxmd.com/read/28073658/copeptin-levels-in-patients-with-vasovagal-syncope
#3
Panayota Flevari, Dionyssios Leftheriotis, Christos Kroupis, George Antonakos, John Lekakis, Kleanthi Dima
BACKGROUND AND PURPOSE: Vasovagal syncope (VVS) is linked to more than one pathophysiologic mechanisms. Copeptin, an emerging cardiovascular marker, is a surrogate for arginine-vasopressin, which increases following VVS. We aimed to assess the dynamic pattern of copeptin levels in typical VVS, categorized by the degree of vasoconstriction during orthostasis, and healthy controls. METHODS: The following groups were studied: Group A (n=21), with adequate limb vasoconstriction during the first min...
January 4, 2017: International Journal of Cardiology
https://www.readbyqxmd.com/read/28063365/aging-reduces-the-high-frequency-and-short-term-adaptation-of-the-vestibulo-ocular-reflex-in-mice
#4
Serajul I Khan, Patrick P Hübner, Alan M Brichta, Doug W Smith, Americo A Migliaccio
Prevailing evidence indicates a relatively late life decline in human vestibulo-ocular reflex (VOR) function. Although mice are commonly used in mechanistic studies of vestibular function, it remains unclear whether aging produces a corresponding decline in VOR function in mice. We sought to determine how the baseline VOR and its short-term adaptation were affected by aging. We tested 8 young (3-month old) and 8 aged (30-month old-equivalent to a ∼80-year old human) C57BL/6 mice. We measured their VOR response to whole-body static tilts and during 0...
December 18, 2016: Neurobiology of Aging
https://www.readbyqxmd.com/read/28059249/automatic-full-compensation-of-quantitative-phase-imaging-in-off-axis-digital-holographic-microscopy
#5
Carlos Trujillo, Raúl Castañeda, Pablo Piedrahita-Quintero, Jorge Garcia-Sucerquia
An automatic method that fully compensates the quantitative phase measurements in off-axis digital holographic microscopy (DHM) is presented. The two main perturbations of the quantitative phase measurements in off-axis DHM are automatically removed. While the curvature phase flaw introduced by the microscope objective is avoided by the use of an optimized telecentric imaging system for the recording of the holograms, the remaining phase perturbation due to the tilt of the reference wave is removed by the automatic computation of a digital compensating reference wave...
December 20, 2016: Applied Optics
https://www.readbyqxmd.com/read/28055996/-syncope-electrocardiogram-and-autonomic-function-tests
#6
William Uribe, Adrián Baranchuk, Federico Botero
Syncope represents one of the most frequent reasons for consultation in the emergency department. A proper identification will allow a precise etiologic approach and the optimization of delivery of health resources.
Once knowing the classification of syncope; it is the clinical interrogatory what enables to discriminate which of these patients present with a neurogenic mediated syncope or a cardiac mediated syncope. The use of diagnostic methods such as the tilt test, will clarify what type of neurally mediated syncope predominates in the patient...
December 23, 2016: Medwave
https://www.readbyqxmd.com/read/28050572/comparison-of-a-novel-weightbearing-cone-beam-computed-tomography-scanner-versus-a-conventional-computed-tomography-scanner-for-measuring-patellar-instability
#7
John Marzo, Melissa Kluczynski, Anthony Notino, Leslie Bisson
BACKGROUND: Conventional computed tomography (CT) images are routinely used for diagnosing patellofemoral instability and are obtained with the patient in a supine position, nonweightbearing, with the knee in full extension, and with leg muscles relaxed. A new portable extremity cone beam CT (CBCT) scanner has been developed that may allow for more accurate diagnosis, as imaging can be performed with the patient standing, the knee flexed, and with leg muscles active. PURPOSE/HYPOTHESIS: The purpose of this study was to compare CT measurements of patellar alignment on a prototype scanner versus conventional scanner in patients with known patellar instability...
December 2016: Orthopaedic Journal of Sports Medicine
https://www.readbyqxmd.com/read/28048851/su-f-t-61-treatment-planning-observations-for-the-civasheet-directional-brachytherapy-device-using-variseed-9-0
#8
M J Rivard, D J Rothley
PURPOSE: The VariSeed 9.0 brachytherapy TPS is recently available and has new features such as ability to rotate a brachytherapy source away from normal to the imaging plane. Consequently, a dosimetric analysis was performed for a directional brachytherapy source (CivaSheet) with tests of this functionality and experiences from clinical treatment planning were documented. These observations contribute to safe, practical, and accurate use of such new software features. METHODS: Several tests were established to evaluate the new rotational feature, specific to the CivaSheet for the first patients treated using this new brachytherapy device...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28048550/su-f-t-481-physics-evaluation-of-a-newly-released-incise%C3%A2-multileaf-collimator-for-cyberknife-m6%C3%A2-system
#9
L Wang, E Chin, A Lo
PURPOSE: This work reports the results of the physics evaluation of a newly released InCise™2 Multileaf Collimator (MLC) installed in our institution. METHODS: Beam property data was measured with unshielded diode and EBT2 films. The measurements included MLC leaf transmission, beam profiles, output factors and tissue-phantom ratios. MLC performance was evaluated for one month after commissioning. Weekly Garden Fence tests were performed for leaf / bank positioning in standard (A/P) and clinically relevant non-standard positions, before and after MLC driving exercises of 10+ minutes...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28046895/su-f-t-648-sharpening-dose-fall-off-via-beam-number-enhancements-for-stereotactic-brain-radiosurgery
#10
J Chiu, M Pierce, S Braunstein, M McDermott, P Sneed, L Ma
PURPOSE: Sharp dose fall-off is the hallmark of brain radiosurgery to deliver a high dose of radiation to the target while minimizing dose to normal brain tissue. In this study, we developed a technique for the purpose of enhancing the peripheral dose gradient by magnifying the total number of beams focused toward each isocenter via patient head tilt and simultaneous beam intensity modulations. METHODS: Computer scripting for the proposed beam number enhancement (BNE) technique was developed...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28046494/su-c-209-07-phantoms-for-digital-breast-tomosynthesis-imaging-system-evaluation
#11
D Jacobson, Y Liu
PURPOSE: Digital Breast Tomosynthesis (DBT) is gaining importance in breast imaging. There is a need for phantoms that can be used for image evaluation and comparison. Existing commercially available phantoms for DBT are expensive and may lack clinically relevant test objects. The purpose of this study is to develop phantoms for DBT evaluation. METHODS: Four phantoms have been designed and constructed to assess the image quality (IQ) of two DBT systems. The first contains a spiral of 0...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28045689/racial-differences-in-response-to-tilt-table-testing-in-patients-refered
#12
Jameel Ahmed, Peerawut Deeprasertkul, Kevin M Monahan, Paul LeLorier
BACKGROUND: Syncope is a common problem in the general population and results in significant societal and patient costs. Several small studies have demonstrated differences in orthostatic response, and possibly tolerance, between blacks and whites. Based on these observations, we retrospectively reviewed results from our tilt table database to identify potential differences in response to tilt-table testing with regards to race, between black and white patients. METHODS: The reports of 446 tilt-table tests performed on adults, older than 18 years of age, at Boston Medical Center, an urban, tertiary-care, academic hospital, were reviewed...
November 2016: Journal of the Louisiana State Medical Society: Official Organ of the Louisiana State Medical Society
https://www.readbyqxmd.com/read/28044009/clot-friction-variation-with-fibrin-content-implications-for-resistance-to-thrombectomy
#13
Gillian M Gunning, Kevin McArdle, Mahmood Mirza, Sharon Duffy, Michael Gilvarry, Patrick A Brouwer
BACKGROUND: Despite significant advancements in the procedural efficacy of mechanical thrombectomy in patients with ischemic stroke in recent years, there still remains a portion of the population that does not achieve good recanalization. The reasons for this may be varied. We hypothesized that static friction between the clot and the vessel, or catheter wall might contribute to the difficulty in removing the clot. OBJECTIVE: To determine if there is a relationship between clot composition and the resistance to sliding (friction) which might contribute to resistance to clot removal...
January 2, 2017: Journal of Neurointerventional Surgery
https://www.readbyqxmd.com/read/28043672/the-changes-of-electrolytes-in-serum-and-urine-in-children-with-neurally-mediated-syncope-cured-by-oral-rehydration-salts
#14
Wenhua Zhang, Runmei Zou, Lijia Wu, Xuemei Luo, Yi Xu, Fang Li, Ping Lin, Zhenwu Xie, Cheng Wang
OBJECTIVE: To detect the changes of electrolytes in serum and urine in children with nerve mediated syncope (NMS) cured by oral rehydration salts (ORS). METHOD: From May 2014 to April 2015, 135 patients with symptoms like unexplained syncope and presyncope were administrated in our hospital, including 60 boys and 75 girls, aged between 4 and 16 (10.2±2.7) years. After head-up tilt test (HUTT), their electrolytes in serum and urine were examined. Those who were positive to the HUTT received ORS and health education, while others were only treated by health education...
December 28, 2016: International Journal of Cardiology
https://www.readbyqxmd.com/read/28042977/full-can-test-mechanisms-of-a-positive-test-in-patients-with-shoulder-pain
#15
Mark K Timmons, Sevgi S Yesilyaprak, Jeff Ericksen, Lori A Michener
BACKGROUND: The full can test is theorized to produce compressive loads on the supraspinatus tendon within the subacromial space. Characterizing the width of the subacromial outlet, scapular orientation, and shoulder pain during the full can test will improve the mechanistic understanding of the positive full can test. METHODS: Cross-sectional repeated measures design. Participants with subacromial pain syndrome (n=30) were compared to a matched control group (n=30) during 2 conditions: passive support, and the full can test...
December 24, 2016: Clinical Biomechanics
https://www.readbyqxmd.com/read/28040875/distal-junctional-kyphosis-in-patients-with-scheuermann-s-disease-a-retrospective-radiographic-analysis
#16
Amir Ghasemi, Timo Stubig, Luigi A Nasto, Malik Ahmed, Hossein Mehdian
PURPOSE: To investigate the relationship between preoperative and postoperative spinopelvic alignment and occurrence of DJK/DJF. STUDY DESIGN/SETTING: This was a retrospective observational cohort study. PATIENT SAMPLE: The sample included 40 patients who underwent posterior correction of SK from January 2006 to December 2014. OUTCOME MEASURES: Correlation analysis between the preoperative and postoperative spinopelvic alignment parameters and development of DJK over the course of the study period were studied...
December 31, 2016: European Spine Journal
https://www.readbyqxmd.com/read/28040628/two-dimensional-analytic-modeling-of-acoustic-diffraction-for-ultrasonic-beam-steering-by-phased-array-transducers
#17
Tiansi Wang, Chong Zhang, Aleksandar Aleksov, Islam Salama, Aravinda Kar
Phased array ultrasonic transducers enable modulating the focal position of the acoustic waves, and this capability is utilized in many applications, such as medical imaging and non-destructive testing. This type of transducers also provides a mechanism to generate tilted wavefronts in acousto-optic deflectors to deflect laser beams for high precision advanced laser material processing. In this paper, a theoretical model is presented for the diffraction of ultrasonic waves emitted by several phased array transducers into an acousto-optic medium such as TeO2 crystal...
December 9, 2016: Ultrasonics
https://www.readbyqxmd.com/read/28039767/static-otolithic-drive-alters-presynaptic-inhibition-in-soleus-motor-pool
#18
Apollonia Fox, David Koceja
The vestibular system has both direct and indirect connections to the soleus motor pool via the vestibulospinal and reticulospinal tracts. The exact nature of how this vestibular information is integrated within the spinal cord is largely unknown. The purpose of this study was to identify whether changes in static otolithic drive altered the amount of presynaptic inhibition in the soleus H-reflex pathway. Changes in static otolithic drive were investigated in sixteen healthy participants using a tilt table...
December 20, 2016: Journal of Electromyography and Kinesiology
https://www.readbyqxmd.com/read/28032709/relationship-between-patellar-tracking-and-the-screw-home-mechanism-of-tibiofemoral-joint
#19
Li-Kang Zhang, Xiao-Meng Wang, Ying-Zhen Niu, Hui-Xin Liu, Fei Wang
OBJECTIVE: To demonstrate the effect of the screw-home motion on the stability of the patellofemoral joint, and investigate its mechanism of regulation of patellar tracking. METHODS: Twenty volunteers who met the criteria were examined. All subjects had axial computed tomography (CT) scanning performed on bilateral knees at 0° and 30° of flexion. Scanning began above the femorotibial articulation and femoral trochlear groove, and moved sequentially down to the level of the anterior tibial tubercle...
November 2016: Orthopaedic Surgery
https://www.readbyqxmd.com/read/28031512/z-plasty-for-severe-gluteal-muscle-contracture-in-children
#20
Kun Zha, Hui Guo Liu, Shuhua Yang, Faqi Cao
PURPOSE: To review the records of 363 patients with severe gluteal muscle contracture to determine its mechanism, underlying pathology, and treatment outcome. METHODS: Records of 136 males and 227 females aged 5 to 18 (mean, 12.2) years who underwent Z-plasty for bilateral (n=347) or unilateral (n=16) severe gluteal muscle contracture were reviewed. Severe gluteal muscle contracture was classified as typical (n=52) or special (n=311). The typical type is associated with symptoms of positive out-toe gait, Ober sign, back-extending test, cross-leg test, squatting with knee side-by-side test, and hip dysfunction...
December 2016: Journal of Orthopaedic Surgery
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