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Tilt test

Luka Lipar, Pia Vovk, Tereza Weiss, Jus Ksela
Swallow syncope is a rare dysautonomic syndrome characterized by temporary loss of consciousness upon swallowing solid foods or liquids, displaying primarily in individuals with an underlying structural or functional esophageal or cardiac pathology. However, the evidence also suggests that isolated vagal dysfunction or abnormal reactions of esophageal mechanoreceptors after mechanical irritation, demyelination, or trauma can potentially evoke  a cardioinhibitory response or vasodepression upon swallowing. We present a case of a 49-year-old otherwise healthy female patient who developed swallow syncope two weeks after whiplash neck injury acquired in a rear-end collision...
March 5, 2018: Heart Surgery Forum
Rafael F Escamilla, Jonathan S Slowik, Alek Z Diffendaffer, Glenn S Fleisig
The purpose of this study was to assess biomechanical differences among overhand, three-quarter, and sidearm arm-slot professional baseball pitchers. It was hypothesized that kinematic-and-kinetic differences would be found among the three groups, with sidearm pitchers demonstrating greater movement along the transverse plane, and overhead pitchers demonstrating greater movement along the sagittal plane. Based upon arm-slot-angle at ball-release, 30-overhand, 156-three-quarter, and 21-sidearm pitchers were tested using a 240-Hz-motion-analysis-system, and 37 kinematic-and-kinetic parameters were calculated...
April 13, 2018: Journal of Applied Biomechanics
Peter Obid, Karen Kar Lum Yiu, Kenneth Mc Cheung, Kenny Kwan, Michael Ruf, Jason Pui Yin Cheung
STUDY DESIGN: Cross-sectional study. OBJECTIVE: To assess the inter- and intraobserver reliability of thoracic, spino-pelvic and rod lengthening measurements made on biplanar spinal stereoradiography (EOS imaging) in children treated with magnetically controlled growing rod (MCGR). SUMMARY OF BACKGROUND DATA: MCGR treatment aims to gain spine length while gradually correcting the spinal deformity. Monitoring thoracic and spino-pelvic parameters are crucial for successful management...
April 11, 2018: Spine
Sonia A Cavigelli, Alexander D Bao, Rebecca A Bourne, Michael J Caruso, Jasmine I Caulfield, Mary Chen, Joshua M Smyth
Chronic mild stress can lead to negative health outcomes. Frequency, duration, and intensity of acute stressors can affect health-related processes. We tested whether the temporal pattern of daily acute stressors (clustered or dispersed across the day) affects depression-related physiology. We used a rodent model to keep stressor frequency, duration, and intensity constant, and experimentally manipulated the temporal pattern of acute stressors delivered during the active phase of the day. Adult male Sprague-Dawley rats were exposed to one of three chronic mild stress groups: Clustered: stressors that occurred within 1 hour of each other (n = 21), Dispersed: stressors that were spread out across the active phase (n = 21), and Control: no stressors presented (n = 21)...
April 12, 2018: Stress: the International Journal on the Biology of Stress
Daniel Létourneau, Harald Keller, Nathan Becker, Md Nurul Amin, Bernhard Norrlinger, David A Jaffray
PURPOSE: The delivery accuracy of highly conformal dose distributions generated using intensity modulation and collimator, gantry and couch degrees of freedom is directly affected by the quality of the alignment between the radiation beam and the mechanical axes of a linear accelerator. For this purpose, quality control (QC) guidelines recommend a tolerance of ± 1 mm for the coincidence of the radiation and mechanical isocenters. Traditional QC methods for assessment of radiation and mechanical axes alignment (based on pointer alignment) are time consuming and complex tasks that provide limited accuracy...
April 12, 2018: Medical Physics
Ji Eun Lee, Hee Kyung Yang, Jae Hyoung Kim, Jeong Min Hwang
BACKGROUND AND PURPOSE: To determine the diagnostic utility of the three-step test in unilateral superior oblique palsy (SOP) according to the presence of the trochlear nerve using high-resolution thin-section magnetic resonance imaging. METHODS: In total, 166 patients with congenital and acquired unilateral SOP were included, comprising 87 with a normal trochlear nerve (present group) and 79 without a trochlear nerve (absent group). The sensitivity of each component of the three-step test was evaluated as well as factors related to the sensitivity...
January 2018: Journal of Clinical Neurology
Qing Lin, Jianmei Xu, Fang Yang, Xingxing Yang, Yun He
BACKGROUND: The nanocrystalline structure of La1 -x Cax FeO3 was prepared by a sol-gel method involving an auto-combustion process. The incorporation of rare-earths in LaFeO3 induces strain in magnetic properties, especially in terms of the following parameters: replacement amount, oxygen partial pressure, and calcination temperature. METHODS: To determine the effects of the amount of Ca2+ ion doping agent and the calcination temperature on the microstructure, particle morphology, and magnetic properties of LaFeO3 crystal, we performed the following respective analytical methods: X-ray powder diffraction, Fourier-transform infrared (FT-IR) spectroscopy, scanning electron microscopy, and vibrating sample magnetometer tests...
January 2018: Journal of Applied Biomaterials & Functional Materials
Ting-Ting Ni, Ying Zhou, An-Cui Yong, Lu Wang, Qing-He Zhou
BACKGROUND: In parturients with increased physiologically intra-abdominal pressure (IAP) and a short stature, a greater cephalad spread of spinal anesthesia is often observed after a fixed amount of plain bupivacaine is administered. Therefore, we designed this prospective study to test whether IAP and vertebral column length (VCL) were predictors of spinal spread in parturients undergoing a cesarean section. METHODS: A total of 113 parturients, all undergoing elective cesarean sections with single-shot spinal anesthesia, were enrolled...
2018: PloS One
Rune Tønnesen, Peter Schwarz, Peter Hovind, Lars Thorbjørn Jensen
The level of circulating vitamin D is known to be associated with the ejection fraction in heart failure patients and studies in rats have shown that vitamin D depletion leads to increased levels of circulating norepinephrine and decreased atrial contractility. We elucidated the effects of vitamin D supplementation on the autonomous nervous system in healthy youngsters. Thirty healthy subjects aged 18-25 years were recruited based on their serum 25-hydroxyvitamin D (25[OH]D): 15 vitamin D insufficient (25[OH]D < 50 nmol/L) and 15 vitamin D sufficient (25[OH]D > 80 nmol/L) subjects...
April 2018: Physiological Reports
Zehra Uysal Kocabas, Ferah Kizilay, Ibrahim Basarici, Hilmi Uysal
OBJECTIVE: We aimed to comprehensively evaluate cardiac autonomic function in patients with MG and to investigate the relationship between this disorder and disease duration, thymoma and acetylcholine receptor antibody positivity in cases of cardiac autonomic disorder. METHODS: The study included 30 patients with MG and 30 age-matched healthy control subjects. Haemodynamic parameters (heart rate, systolic and diastolic blood pressure) and autonomic parameters (low frequency [LF], high-frequency [HF], sympathovagal balance [LF/HF], baroreceptor reflex sensitivity [BRS]) of the patients were automatically measured at rest and in a tilted position with the Task Force Monitor...
April 2, 2018: Neurological Research
Hongxia Li, Ying Liao, Zhenhui Han, Yuli Wang, Ping Liu, Chunyu Zhang, Chaoshu Tang, Junbao Du, Hongfang Jin
AIM: This study examined the total peripheral vascular resistance (TPVR) and cardiac output changes due to the head-up tilt test (HUTT) in children with vasovagal syncope (VVS). METHODS: From December 2013 to January 2016, we recruited 77 children diagnosed with VVS group at Peking University First Hospital, China, and 28 children without VVS provided the control group. Heart rate, blood pressure, TPVR, cardiac output and baroreflex sensitivity were monitored during the HUTT...
March 30, 2018: Acta Paediatrica
Mostafa Shahein, Alaa S Montaser, Alexandre B Todeschini, Juan M Revuelta Barbero, Bradley A Otto, Ricardo L Carrau, Daniel M Prevedello
We present the case of a 67-year-old female with an incidental finding of a left-sided tuberculum sellae meningioma on a brain magnetic resonance imaging (MRI) for an unrelated complaint. Formal visual field testing showed a small defect in the inferior nasal and temporal fields of the left eye, compatible with mass effect on the optic nerve by the tumor. An endoscopic endonasal transtuberculum approach with decompression of the left optic nerve was performed using a standard binostril four-hand technique, with the patient positioned supine with the head turned to the right side and tilted to the left, fixed in a three-pin head clamp, under imaging guidance...
April 2018: Journal of Neurological Surgery. Part B, Skull Base
Katarina Bohman, Kristy B Arbogast, Helen Loeb, Judith L Charlton, Sjaan Koppel, Suzanne L Cross
OBJECTIVE: The aim of this study was to evaluate the consequences of frontal and oblique crashes when positioning a Hybrid III (HIII) 6-year-old child anthropometric test device (ATD) using observed child passenger postures from a naturalistic driving study (NDS). METHODS: Five positions for booster-seated children aged 4-7 years were selected, including one reference position according to the FMVSS 213 ATD seating protocol and 4 based on real-world observed child passenger postures from an NDS including 2 user positions with forward tilting torso and 2 that combined both forward and lateral inboard tilting of the torso...
February 28, 2018: Traffic Injury Prevention
Arvind Gautam, Miguel A Callejas, Amit Acharyya, Swati Ghosh Acharyya
This study introduced a shape memory alloy (SMA)-based smart knee spacer for total knee arthroplasty (TKA). Subsequently, a 3D CAD model of a smart tibial component of TKA was designed in Solidworks software, and verified using a finite element analysis in ANSYS Workbench. The two major properties of the SMA (NiTi), the pseudoelasticity (PE) and shape memory effect (SME), were exploited, modelled, and analysed for a TKA application. The effectiveness of the proposed model was verified in ANSYS Workbench through the finite element analysis (FEA) of the maximum deformation and equivalent (von Mises) stress distribution...
March 22, 2018: Medical Engineering & Physics
Tristan W Dorey, Myles W O'Brien, Susan A Robinson, Derek S Kimmerly
INTRODUCTION: In healthy individuals during a non-exercised state, knee-high compression socks (CS) may reduce the magnitude of lower limb venous pooling during orthostasis but are not effective at minimizing the incidence of presyncopal symptoms. However, exaggerated reductions in cerebral blood flow velocity (CBV), and cardiac stroke volume (SV) occur during passive head-up tilt (HUT) testing following dynamic exercise. It is unknown if CS can minimize post-exercise HUT-induced decrements in CBV and SV in this population...
March 25, 2018: Scandinavian Journal of Medicine & Science in Sports
Ronita L Cromwell, Jessica M Scott, Meghan Downs, Patrice O Yarbough, Susana B Zanello, Lori Ploutz-Snyder
PURPOSE: The purpose of this paper is to provide an overview of the NASA 70-day Bed Rest Study. The integrated complement of investigations and the standardized bed rest environment that served as the platform for this study complement are described. Outcomes of the studies will not be presented here, but will be reported in separate publications. METHODS: A set of studies running in an integrated fashion along the entire period (pre-, in- and post-bed rest) and utilizing the same subjects is referred in this paper as "the campaign" or "complement"...
March 22, 2018: Medicine and Science in Sports and Exercise
Kevin G Laudner, Regan H Wong, James R Latal, Keith Meister
Laudner, K, Wong, R, Latal, J, and Meister, K. Descriptive profile of lumbopelvic control in collegiate baseball pitchers. J Strength Cond Res 32(4): 1150-1154, 2018-Throwing a baseball requires the transmission of forces generated in the lower extremity, through the trunk, then to the upper extremity, and ultimately out through the ball. Disruptions in this kinetic chain, specifically in lumbopelvic control, have been associated with decreased pitching performance and increased risk of injury. The purpose of this study was to establish normative data of lumbopelvic control among collegiate baseball pitchers...
April 2018: Journal of Strength and Conditioning Research
Liza A M Pain, Ross Baker, Qazi Zain Sohail, Denyse Richardson, Karl Zabjek, Jeremy P M Mogk, Anne M R Agur
PURPOSE: Altered three-dimensional (3D) joint kinematics can contribute to shoulder pathology, including post-stroke shoulder pain. Reliable assessment methods enable comparative studies between asymptomatic shoulders of healthy subjects and painful shoulders of post-stroke subjects, and could inform treatment planning for post-stroke shoulder pain. The study purpose was to establish intra-rater test-retest reliability and within-subject repeatability of a palpation/digitization protocol, which assesses 3D clavicular/scapular/humeral rotations, in asymptomatic and painful post-stroke shoulders...
March 23, 2018: Disability and Rehabilitation
Michalina Błażkiewicz, Ida Wiszomirska, Katarzyna Kaczmarczyk, Andrzej Wit
BACKGROUND: Falls constitute an important health issue. They cause significant morbidity, mortality and have marked psychological effects on the individual, too. The aim of this study has been to determine parameters describing human movement strategies for balance and the reaction if balance is lost as a result of an unstable ground, and to attempt to describe the types of falls. MATERIAL AND METHODS: The study group comprised 20 volunteers. Kinematic parameters of falling and dynamic stability were measured using the Vicon Motion System and the Biodex Balance System SD...
March 15, 2018: Medycyna Pracy
Takuya Kurazumi, Yojiro Ogawa, Ryo Yanagida, Hiroshi Morisaki, Ken-Ichi Iwasaki
BACKGROUND: Exposure to carbon dioxide (CO2) and cephalad fluid shift are considered factors that affect intracranial pressure (ICP) during spaceflight. Increases in ICP were reported during cephalad fluid shift induced by head-down tilt (HDT), while little is known regarding the effect of additional CO2 during HDT on ICP. Therefore, we tested the hypothesis that this combination increases ICP more than HDT alone. METHODS: There were 15 healthy male volunteers who underwent 4 types of 10-min interventions consisting of Placebo/Supine (air and supine), CO2/Supine (3% CO2 and supine, CO2 alone), Placebo/HDT (air and -10° HDT, HDT alone), and CO2/HDT (3% CO2 and -10° HDT, combination)...
April 1, 2018: Aerospace Medicine and Human Performance
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