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https://www.readbyqxmd.com/read/29052037/effects-of-mirror-placement-on-sagittal-alignment-of-the-spine-during-acquisition-of-full-spine-standing-x-rays
#1
Shin Oe, Daisuke Togawa, Go Yoshida, Tomohiko Hasegawa, Yu Yamato, Tatsuya Yasuda, Tomohiro Banno, Hideyuki Arima, Yuki Mihara, Hiroki Ushirozako, Yukihiro Matsuyama
PURPOSE: The line of sight when whole-spine radiographs are taken has not been defined. In our 2012 health screening study (TOEI study), whole-spine radiographs were taken with the volunteers in the most relaxed position and with a horizontal gaze. However, in the TOEI 2014 study, a mirror was placed in front of their faces to unify their line of sight. To our knowledge, there are no reports on how the sagittal alignment changes when radiographs are taken using a mirror. The purpose of this study was to investigate how mirror placement impacted sagittal spinal alignment in whole-spine radiographs taken while standing...
October 19, 2017: European Spine Journal
https://www.readbyqxmd.com/read/29049632/an-engineering-model-to-test-for-sensory-reweighting-in-non-human-primate-posture
#2
Lara A Thompson, Csilla Haburcakova, Adam D Goodworth, Richard F Lewis
Quantitative animal models are critically needed to provide proof-of-concept for the investigation of rehabilitative balance therapies (e.g., invasive vestibular prostheses) and treatment response prior to, or in conjunction with, human clinical trials. This paper describes a novel approach to modeling the non-human primate postural control system. Our observation that rhesus macaques and humans have even remotely similar postural control motivates the further application of the rhesus macaque as a model for studying the effects of vestibular dysfunction, as well as vestibular prosthesis-assisted states, on human postural control...
October 10, 2017: Journal of Biomechanical Engineering
https://www.readbyqxmd.com/read/29045970/-unilateral-patellar-resurfacing-in-bilateral-total-knee-arthroplasty-a-randomized-controlled-study
#3
J F Wang, Z Li, K S Zhang, F Yuan, R J Li, Q J Zhong, Z P Guan
OBJECTIVE: To perform unilateral patellar resurfacing and contralateral patellar retention in bilateral total knee arthroplasty (TKA) randomly, and to compare the clinical effects of patellar retention with patellar resurfacing in TKA. METHODS: In the study, 14 bilateral knee osteoarthritis (OA) patients were randomized in the bilateral TKA to receive unilateral patellar resurfacing and contralateral patellar retention, including 28 knees, all were females, 53 to 78 years old, with average (66...
October 18, 2017: Beijing da Xue Xue Bao. Yi Xue Ban, Journal of Peking University. Health Sciences
https://www.readbyqxmd.com/read/29045956/-co-morbidity-of-vasovagal-syncope-and-postural-tachycardia-syndrome-with-allergic-diseases-in-children
#4
Y Liao, Q Y Zhang, H X Li, Y L Wang, P Liu, J B DU
OBJECTIVE: To explore the clinical characteristics of the co-morbidity of vasovagal syncope (VVS) and postural tachycardia syndrome (POTS) with allergic diseases in children. METHODS: A re-trospective analysis was launched to summarize the clinical data of children with VVS and POTS. They were divided into allergic group and non-allergic group according to the history of allergic diseases. The participants' clinical characteristics were compared between allergic group and non-allergic group using independent sample t test or rank sum test; composition comparisons were completed by Chi-square test...
October 18, 2017: Beijing da Xue Xue Bao. Yi Xue Ban, Journal of Peking University. Health Sciences
https://www.readbyqxmd.com/read/29045952/-progress-in-diagnosis-and-management-of-syncope-in-children
#5
W R Xu, Y Liao, H F Jin, Q Y Zhang, C S Tang, J B DU
Syncope is a common emergency of children and adolescents, which has serious influence on the quality of life. Neurally-mediated syncope, including postural tachycardia syndrome, vasovagal syncope, orthostatic hypotension and orthostatic hypertension, is the main cause of syncope in children and adolescents. The main manifestations of neurally-mediated syncope are diverse, such as dizziness, headache, chest tightness, chest pain, pale complexion, fatigue, pre-syncope and syncope. Although the clinical manifestations are similar, each subtype of syncope has its hemodynamic feature and optimal treatment option...
October 18, 2017: Beijing da Xue Xue Bao. Yi Xue Ban, Journal of Peking University. Health Sciences
https://www.readbyqxmd.com/read/29037796/salivary-cortisol-levels-predict-therapeutic-response-to-a-sleep-promoting-method-in-children-with-postural-tachycardia-syndrome
#6
Jing Lin, Huacai Zhao, Jie Shen, Fuyong Jiao
OBJECTIVE: To determine the value of salivary cortisol concentrations in predicting the efficacy of sleep-promoting treatment in children with postural tachycardia syndrome (POTS). STUDY DESIGN: This prospective study involved 40 children with POTS and 20 healthy children (controls). POTS was diagnosed using the head-up or head-up tilt test. Patients with POTS received a sleep-promoting treatment: >8 hours of sleep every night and a midday nap in an appropriate environment; no drinking water or exercising before bedtime; and urination before bedtime...
October 13, 2017: Journal of Pediatrics
https://www.readbyqxmd.com/read/29036615/monitoring-of-cerebral-oximetry-during-head-up-tilt-test-in-adults-with-history-of-syncope-and-orthostatic-intolerance
#7
E Bachus, H Holm, V Hamrefors, O Melander, R Sutton, M Magnusson, A Fedorowski
Aims: We applied near-infrared-spectroscopy (NIRS) to measure absolute frontal cerebral tissue oxygen saturation (SctO2) during head-up tilt test (HUT) in patients investigated for unexplained syncope. Methods and results: Synchronized non-invasive beat-to-beat haemodynamic monitoring, ECG, SctO2 (NIRS; normal range: 60-80%), and peripheral oxygen saturation (left hand, SpO2) were applied during HUT in a random sample of patients with unexplained syncope. Tracings of 54 patients (mean-age: 55 ± 19 years, 39% male) with negative HUT, vasovagal syncope (VVS), or orthostatic hypotension (OH) were analysed...
September 28, 2017: Europace: European Pacing, Arrhythmias, and Cardiac Electrophysiology
https://www.readbyqxmd.com/read/29034583/the-effect-of-head-up-tilt-upon-markers-of-heart-rate-variability-in-patients-with-atrial-fibrillation
#8
Hitesh C Patel, Carl Hayward, Andrew J Wardle, Lee Middleton, Alexander R Lyon, Carlo Di Mario, Tushar V Salukhe, Richard Sutton, Stuart D Rosen
BACKGROUND: Heart rate variability (HRV) analysis is uncommonly undertaken in patients with atrial fibrillation (AF) due to an assumption that ventricular response is random. We sought to determine the effects of head-up tilt (HUT), a stimulus known to elicit an autonomic response, on HRV in patients with AF; we contrasted the findings with those of patients in sinus rhythm (SR). METHODS: Consecutive, clinically indicated tilt tests were examined for 207 patients: 176 in SR, 31 in AF...
October 15, 2017: Annals of Noninvasive Electrocardiology
https://www.readbyqxmd.com/read/29034272/influence-of-head-position-on-the-cbct-accuracy-in-assessment-of-the-proximity-of-the-root-apices-to-the-inferior-alveolar-canal
#9
Sadaf Adibi, Shoaleh Shahidi, Saeed Nikanjam, Maryam Paknahad, Mohammadali Ranjbar
STATEMENT OF THE PROBLEM: The most important risk factor for inferior alveolar nerve (IAN) damage is the proximity of the mandibular root apices to the alveolar canal. Failure to position the patient's head at standardized orientation during cone beam computed tomography (CBCT) scans might adversely affect the relative position of the alveolar canal and mandibular root apices with subsequent treatment failure. PURPOSE: The purpose of the present study was to investigate the influence of the orientations of the skull during the scanning procedure on the accuracy of CBCT images in determining the positional relationship of the mandibular tooth apices to the alveolar canal...
September 2017: Journal of Dentistry
https://www.readbyqxmd.com/read/29023991/correlation-of-head-up-tilt-table-test-time-interval-with-future-risk-of-recurrent-syncope
#10
Bhanwar L Ranwa, Priti K, Sajal Gupta
BACKGROUND: Head-up tilt table test (HUTT) is widely used for investigation of syncope and presyncope. Time required for positive response has a probable relationship to the sensitivity of neural reflex mechanism underlying syncope. METHODS: We evaluated patients with history of syncope. Group A included patients with recurrent syncope defined as 2 or more episodes of syncope and group B included those with 1 episode of syncope. Time required for the test to become positive in both the groups was analyzed...
October 10, 2017: Pacing and Clinical Electrophysiology: PACE
https://www.readbyqxmd.com/read/29023796/hemodynamic-parameters-and-baroreflex-sensitivity-during-head-up-tilt-test-in-patients-with-neurally-mediated-syncope
#11
Sung Ho Lee, Ji Hyun Yang, Hye Ran Yim, Jungwae Park, Seung-Jung Park, Kyoung-Min Park, Young Keun On, June Soo Kim
BACKGROUND: We aimed to investigate differences in hemodynamic parameters and the role of baroreflex sensitivity (BRS) in patients with a history of neurally mediated syncope (NMS) compared with a control group. METHODS: Hemodynamic parameters and BRS were continuously measured non-invasively using a Finometer at rest and during passive head-up tilt test (HUT) in patients with a history of NMS (n = 55) and a control group (n = 77). The tilting period was divided into pretest (resting supine position), initial (first 3 minutes of tilting), last (last 3 minutes of tilting), and recovery (3 minutes after tilting was complete) periods...
October 10, 2017: Pacing and Clinical Electrophysiology: PACE
https://www.readbyqxmd.com/read/29018320/virtual-balancing-for-studying-and-training-postural-control
#12
Daniela Buettner, Daniela Dalin, Isabella K Wiesmeier, Christoph Maurer
Postural control during free stance has been frequently interpreted in terms of balancing an inverted pendulum. This even holds, if subjects do not balance their own, but an external body weight. We introduce here a virtual balancing apparatus, which produces torque in the ankle joint as a function of ankle angle resembling the gravity and inertial effects of free standing. As a first aim of this study, we systematically modified gravity, damping, and inertia to examine its effect on postural control beyond the physical constraints given in the real world...
2017: Frontiers in Neuroscience
https://www.readbyqxmd.com/read/28991754/temporal-analysis-of-cardiovascular-and-respiratory-complexity-by-multiscale-entropy-based-on-symbolic-dynamics
#13
Sina Reulecke, Sonia Charleston Villalobos, Andreas Voss, Ramon Gonzalez-Camarena, Jesus Antonio Gonzalez-Hermosillo, Jatziri Gaitan, Guadalupe Hernandez-Pacheco, Rico Schroeder, Tomas Aljama-Corrales
The effect of an orthostatic stress on cardiovascular and respiratory complexity was investigated to detect impaired autonomic regulation in patients with vasovagal syncope (VVS). Sixteen female patients and 12 age-matched healthy female subjects were enrolled in a passive 70° head-up tilt test. Also, 12 age-matched healthy male subjects were enrolled to study gender differences. Analysis was performed dynamically using various short-term (5 min) windows shifted by 1 min as well as by 20 min of orthostatic phase (OP) to evaluate local and global complexity...
October 9, 2017: IEEE Journal of Biomedical and Health Informatics
https://www.readbyqxmd.com/read/28991727/a-time-varying-non-parametric-methodology-for-assessing-changes-in-qt-variability-unrelated-to-heart-rate-variability
#14
Michele Orini, Esther Pueyo, Pablo Laguna, Raquel Bailon
OBJECTIVE: To propose and test a novel methodology to measure changes in QT interval variability (QTV) unrelated to RR interval variability (RRV) in non-stationary conditions. METHODS: Time-frequency coherent and residual spectra representing QTV related (QTVrRRV) and unrelated (QTVuRRV) to RRV, respectively, are estimated using time-frequency Cohen's class distributions. The proposed approach decomposes the non-stationary output spectrum of any two-input one-output model with uncorrelated inputs into two spectra representing the information related and unrelated to one of the two inputs, respectively...
October 6, 2017: IEEE Transactions on Bio-medical Engineering
https://www.readbyqxmd.com/read/28991105/low-dose-aspirin-inhibits-cardiac-sympathetic-activation-and-vagal-withdrawal-response-to-morning-rising
#15
Tomiya Yasumasu, Kazuo Takahara, Yutaka Otsuji
Aspirin is known to interfere with platelet function and can protect individuals at risk of sudden death. However, this property of aspirin is less defined for cardiac autonomic activity. We assessed pulse rate variability by spectral analysis and measured plasma eicosanoid levels before and after administration of 81-mg aspirin to 12 healthy subjects over a 60-degree head-up tilt test in the morning. In upright posture, low-dose aspirin decreased both the normalized unit value of low-frequency (normalized LF) power (mean ± SD, 82...
October 2017: Journal of Cardiovascular Pharmacology
https://www.readbyqxmd.com/read/28989219/task-driven-orbit-design-and-implementation-on-a-robotic-c-arm-system-for-cone-beam-ct
#16
S Ouadah, M Jacobson, J W Stayman, T Ehtiati, C Weiss, J H Siewerdsen
PURPOSE: This work applies task-driven optimization to the design of non-circular orbits that maximize imaging performance for a particular imaging task. First implementation of task-driven imaging on a clinical robotic C-arm system is demonstrated, and a framework for orbit calculation is described and evaluated. METHODS: We implemented a task-driven imaging framework to optimize orbit parameters that maximize detectability index d'. This framework utilizes a specified Fourier domain task function and an analytical model for system spatial resolution and noise...
March 2017: Proceedings of SPIE
https://www.readbyqxmd.com/read/28987832/postoperative-cerebral-ischemia-due-to-hypotension-in-a-moyamoya-patient-with-autonomic-dysfunction-a-case-report
#17
Toshio Machida, Yoshinori Higuchi, Shigeki Nakano, Satoshi Ishige, Junichiro Shimada, Koichi Honma
BACKGROUND: Hypotension is a significant risk factor for the development of ischemic complication following revascularization surgery for moyamoya disease (MMD). However, it is currently unknown whether autonomic dysfunction also plays a role. CASE DESCRIPTION: Here we report a case of MMD in which hypotension due to autonomic dysfunction caused postoperative cerebral ischemia. A 30-year-old female patient with MMD had a history of transient right hemiparesis following laughter...
October 4, 2017: World Neurosurgery
https://www.readbyqxmd.com/read/28986003/postural-tachycardia-in-hypermobile-ehlers-danlos-syndrome-a-distinct-subtype
#18
Mitchell G Miglis, Brittany Schultz, Srikanth Muppidi
INTRODUCTION: It is not clear if patients with postural tachycardia syndrome (POTS) and Ehlers-Danlos syndrome (hEDS) differ from patients with POTS due to other etiologies. We compared the results of autonomic testing and healthcare utilization in POTS patients with and without hEDS. METHODS: Patients with POTS+hEDS (n=20) and POTS controls without hypermobility (n=20) were included in the study. All patients underwent autonomic testing, and the electronic medical records were reviewed to determine the number and types of medications patients were taking, as well as the number of outpatient, emergency department, and inpatient visits over the prior year...
October 2, 2017: Autonomic Neuroscience: Basic & Clinical
https://www.readbyqxmd.com/read/28983659/cardiac-and-peripheral-vasomotor-autonomic-functions-in-late-onset-transthyretin-val30met-familial-amyloid-polyneuropathy
#19
Haruki Koike, Tomohiko Nakamura, Atsushi Hashizume, Ryoji Nishi, Shohei Ikeda, Yuichi Kawagashira, Masahiro Iijima, Masahisa Katsuno, Gen Sobue
The objective of this study was to systematically investigate cardiac and peripheral vasomotor autonomic functions in late-onset transthyretin Val30Met familial amyloid polyneuropathy (FAP ATTR Val30Met) patients from non-endemic areas. The coefficient of variation of R-R intervals (CVR-R), responses to the Valsalva manoeuvre, head-up tilt test with impedance cardiography, noradrenaline infusion test, and (123)I-metaiodobenzylguanidine (MIBG) myocardial scintigraphy were assessed in eight patients. Although only four patients manifested orthostatic hypotension during the head-up tilt test, CVR-R, responses to the Valsalva manoeuvre, and myocardial MIBG uptake indicated a higher prevalence of cardiac sympathetic and parasympathetic dysfunction...
October 5, 2017: Journal of Neurology
https://www.readbyqxmd.com/read/28983570/updating-of-visual-orientation-in-a-gravity-based-reference-frame
#20
Nynke Niehof, Julian J Tramper, Christian F Doeller, W Pieter Medendorp
The brain can use multiple reference frames to code line orientation, including head-, object-, and gravity-centered references. If these frames change orientation, their representations must be updated to keep register with actual line orientation. We tested this internal updating during head rotation in roll, exploiting the rod-and-frame effect: The illusory tilt of a vertical line surrounded by a tilted visual frame. If line orientation is stored relative to gravity, these distortions should also affect the updating process...
October 1, 2017: Journal of Vision
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