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Head tilt

Elizabeth G Mosher, John A Butman, Les R Folio, Nadia M Biassou, Choonsik Lee
OBJECTIVE: Radiation exposure of the lens during neck CT may increase a patient's risk of developing cataracts. Radiologists at the National Institutes of Health worked with technicians to modify the neck CT scanning procedure to include a reduction in the scanning range, a reduction in the tube potential (kilovoltage), and a change in neck positioning using a head tilt. We objectively quantified the organ dose changes after this procedure modification using a computer simulation. MATERIALS AND METHODS: We retrospectively analyzed CT images of 40 patients (20 men and 20 women) scanned before and after the procedure change...
March 16, 2018: AJR. American Journal of Roentgenology
Ayesha Afridi, Arshad Nawaz Malik, Shaukat Ali, Imran Amjad
The Nintendo Wii-fit plus is a type of Virtual Reality exer-gaming with graphical and auditory response system. A case series was conducted at Shifa Tamer-e-Millat University Islamabad from January-July 2016. Sixteen adults more than 60 years age (07 males and 09 females) were recruited through convenient sampling. The specified Wii fit plus training was provided to all patients and the games included the Soccer heading, Ski slalom, table tilt and yoga. Berg balance test, time up and go and functional reach test were used before and after 06 weeks of treatment (4 days / week)...
March 2018: JPMA. the Journal of the Pakistan Medical Association
Tomohiro Kubo, Yuqing Hou, Deborah A Cochran, George B Witman, Toshiyuki Oda
Motility of cilia/flagella is generated by a coordinated activity of thousands of dyneins. Inner dynein arms (IDAs) are particularly important for the formation of ciliary/flagellar waveforms, but the molecular mechanism of IDA regulation is poorly understood. Here, we show using cryo-electron tomography and biochemical analyses of Chlamydomonas flagella that a conserved protein FAP44 forms a complex that tethers IDA f (I1 dynein) head domains to the A-tubule of the axonemal outer doublet microtubule. In wild-type flagella, IDA f showed little nucleotide-dependent movement except for a tilt in the f β head perpendicular to the microtubule-sliding direction...
March 14, 2018: Molecular Biology of the Cell
Michelle de Lima Farah, Murillo Santinello, Luis Eduardo Morato Rebouças de Carvalho, Carlos Fumiaki Uesugui, Ronaldo Boaventura Barcellos
PURPOSE: To describe a new method for measuring anomalous head positions by using a cell phone. METHODS: The photo rotation feature of the iPhone® PHOTOS application was used. With the patient seated on a chair, a horizontal stripe was fixed on the wall in the background and a sagittal stripe was fixed on the seat. Photographs were obtained in the following views: front view (photographs A and B; with the head tilted over one shoulder) and upper axial view (photographs C and D; viewing the forehead and nose) (A and C are without camera rotation, and B and D are with camera rotation)...
January 2018: Arquivos Brasileiros de Oftalmologia
Rogerio Ferreira Liporaci, Marcelo Camargo Saad, Julio César Crescêncio, Fabiana Marques, Debora Bevilaqua-Grossi, Lourenço Gallo-Júnior
BACKGROUND: Maintenance of orthostatism requires the interaction of autonomic and muscle responses for an efficient postural control, to minimize body motion and facilitate venous return in a common type of syncope called neurocardiogenic syncope (NCS). Muscle activity in standing position may be registered by surface electromyography, and body sway confirmed by displacement of the center of pressure (COP) on a force platform. These peripheral variables reflect the role of muscles in the maintenance of orthostatism during the active tilt test, which, compared with muscle activity during the passive test (head-up tilt test), enables the analyses of electromyographic activity of these muscles that may anticipate the clinical effects of CNS during these tests...
January 2018: Arquivos Brasileiros de Cardiologia
Clara Gregori-Pla, Gianluca Cotta, Igor Blanco, Peyman Zirak, Martina Giovannella, Anna Mola, Ana Fortuna, Turgut Durduran, Mercedes Mayos
MOTIVATION: Obstructive sleep apnea (OSA) can impair cerebral vasoreactivity and is associated with an increased risk of cerebrovascular disease. Unfortunately, an easy-to-use, non-invasive, portable monitor of cerebral vasoreactivity does not exist. Therefore, we have evaluated the use of near-infrared diffuse correlation spectroscopy to measure the microvascular cerebral blood flow (CBF) response to a mild head-of-bed position change as a biomarker for the evaluation of cerebral vasoreactivity alteration due to chronic OSA...
2018: PloS One
Jinguo Wang, Feng Liu, Shunshun Liu, Na Wang
BACKGROUND The complication rate of central venous catheterization ranges from 4% to 35%. Brachial plexus injury can occur, mostly on the same side as the catheterization, without affecting the contralateral brachial plexus. CASE REPORT A 71-year-old woman received placement of a vein hemodialysis catheter via right internal jugular vein. Five days after the cannulation, she complained of contralateral burning pain and numbness at the ulnar side of her left forearm. On the next day, the pain increased and extended to her left shoulder girdle and whole left arm, despite use of analgesics...
March 13, 2018: American Journal of Case Reports
Anton A Kasatkin, Aleksandr L Urakov, Anna R Nigmatullina
INTRODUCTION: Central venous cannulation may be difficult in morbidly obese patients. We present a case of successful right internal jugular vein catheterization under real-time ultrasound guidance in an obese patient in a forced semi-sitting position. CASE REPORT: A 43-year-old male patient with body mass of 182 kg (body mass index, 52.2 kg/m2 ) was admitted to the clinic 48 h after the trauma. The patient was in a forced semi-sitting position (37° head elevation)...
March 1, 2018: Journal of Vascular Access
William S Murphy, Ho Hyun Yun, Brett Hayden, Jens H Kowal, Stephen B Murphy
BACKGROUND: Cup malposition is a common cause of impingement, limitation of ROM, acceleration of bearing wear, liner fracture, and instability in THA. Previous studies of the safe zone based on plain radiographs have limitations inherent to measuring angles from two-dimensional projections. The current study uses CT to measure component position in stable and unstable hips to assess the presence of a safe zone for cup position in THA. QUESTIONS/PURPOSES: (1) Does acetabular component orientation, when measured on CT, differ in stable components and those revised for recurrent instability? (2) Do CT data support historic safe zone definitions for component orientation in THA? METHODS: We identified 34 hips that had undergone revision of the acetabulum for recurrent instability that also had a CT scan of the pelvis between August 2003 and February 2017...
February 2018: Clinical Orthopaedics and related Research
Peng Yuan, Vincent Koppelmans, Patricia Reuter-Lorenz, Yiri De Dios, Nichole Gadd, Scott Wood, Roy Riascos, Igor Kofman, Jacob Bloomberg, Ajitkumar Mulavara, Rachael Seidler
Head-down-tilt bed rest (HDBR) is frequently utilized as a spaceflight analog research environment to study the effects of axial body unloading and fluid shifts that are associated with spaceflight in the absence of gravitational modifications. HDBR has been shown to result in balance changes, presumably due to sensory reweighting and adaptation processes. Here, we examined whether HDBR results in changes in the neural correlates of vestibular processing. Thirteen men participated in a 70-day HDBR intervention; we measured balance, functional mobility, and functional brain activity in response to vestibular stimulation at 7 time points before, during, and after HDBR...
March 12, 2018: Human Brain Mapping
Andrew P Owens, David A Low, Hugo D Critchley, Christopher J Mathias
Cognitive and emotional processes are influenced by interoception (homeostatic somatic feedback), particularly when physiological arousal is unexpected and discrepancies between predicted and experienced interoceptive signals may engender anxiety. Due to the vulnerability for comorbid psychological symptoms in forms of orthostatic intolerance (OI), this study investigated psychophysiological contributions to emotional symptomatology in 20 healthy control participants (13 females, mean age 36 ± 8 years), 20 postural tachycardia syndrome (PoTS) patients (18 females, mean age 38 ± 13 years) and 20 vasovagal syncope (VVS) patients (15 females, mean age 39 ± 12 years)...
January 31, 2018: Autonomic Neuroscience: Basic & Clinical
Patricia Dayrell Neiva, Letícia Paiva Franco, Renata Noce Kirkwood, Helena Gonçalves Becker
The clinical decision for surgical treatment of children diagnosed with mouth breathing depends on the percentage of mechanical obstruction correlated with exacerbation of upper respiratory tract infections and systemic changes. The benefits of adenotonsillectomy include changes in the nasopharyngeal space, the mandibular plane and myofunctional alterations. Post-adenotonsilectomy postural benefits have not yet been described. OBJECTIVES: To investigate the kinematics of the shoulder girdle, cervical and thoracic spine in children with mouth breathing before and after adenotonsillectomy...
April 2018: International Journal of Pediatric Otorhinolaryngology
Joham Choque-Velasquez, Roberto Colasanti, Julio C Resendiz-Nieves, Kléber E Gonzáles-Echevarría, Rahul Raj, Behnam Rezai Jahromi, Felix Goehre, Ann-Christine Lindroos, Juha Hernesniemi
OBJECTIVE: Nowadays, the sitting position has lost favor among neurosurgeons partly due to assumptions of increased complications, such as venous air embolisms (VAEs) and hemodynamic disturbances. Moreover, it may oblige the surgeon to a tiring posture. Herein, we describe our protocol for the "praying (steeper sitting) position" for pineal region surgery, a variant which may reduce some of the risks of the sitting position while providing a more ergonomic surgical position...
February 27, 2018: World Neurosurgery
Jacquie Baker, Justin R Paturel, David M Sletten, Phillip A Low, Kurt Kimpinski
OBJECTIVE: To develop a scale to quantify and discriminate orthostatic from non-orthostatic symptoms. In the current study, we present validation and reliability of orthostatic and non-orthostatic symptom scores taken from the orthostatic discriminate and severity scale (ODSS). METHODS: Validity and reliability were assessed in participants with and without orthostatic intolerance. Convergent validity was assessed by correlating symptoms scores with previously validated tools [autonomic symptom profile (ASP) and the orthostatic hypotension questionnaire (OHQ)]...
February 28, 2018: Clinical Autonomic Research: Official Journal of the Clinical Autonomic Research Society
Shaofu Wang, Jing Li, Guohua Lü, Bing Wang, Xiaobin Wang
PURPOSE: Hemivertebra of the cervical spine is a rare but complex spinal malformation. To our knowledge, only one publication describes excision of an upper-middle cervical (between C2 and C4) hemivertebra. We present our experience with two cases of C3 hemivertebra resection and torticollis correction via a combined anterior-posterior-anterior surgical approach and short segment fixation. METHODS: Two 12-year-old patients with torticollis due to congenital C3 hemivertebra underwent surgery consisting of combined anterior vertebral body osteotomy, posterior element resection with segment instrumentation and deformity correction, and iliac bone graft reconstruction and fixation via an anterior approach...
February 28, 2018: European Spine Journal
Kyriaki Kostoglou, Ronald Schondorf, Julie Benoit, Saharnaz Balegh, Georgios D Mitsis
OBJECTIVE: In this study we aimed to predict the time to syncope occurrence (TSO) in patients with vasovagal syncope (VVS), solely based on measurements recorded during the supine position of the head-up tilt (HUT) testing protocol. METHODS: We extracted various time and frequency domain features related to morphological aspects of arterial blood pressure (ABP) and the electrocardiogram (ECG) raw signals as well as to dynamic interactions between beat-to-beat ABP, heart rate, and cerebral blood flow velocity...
2018: Acta Neurochirurgica. Supplement
Aaron Dentinger, Michael MacDonald, Douglas Ebert, Kathleen Garcia, Ashot Sargsyan
OBJECTIVE:  The objective is enhanced ophthalmic ultrasound imaging to monitor ocular structure and intracranial dynamics changes related to visual impairment and intracranial pressure (ICP) induced by microgravity. The goals are to improve the ease of use and reduce operator variability by automatically rendering improved views of the anatomy and deriving new metrics of the morphology and dynamics. MATERIALS AND METHODS:  A prototype three-dimensional (3-D) probe was integrated onto a portable ultrasound scanner...
2018: Acta Neurochirurgica. Supplement
Peng Yuan, Vincent Koppelmans, Patricia Reuter-Lorenz, Yiri De Dios, Nichole Gadd, Roy Riascos, Igor Kofman, Jacob Bloomberg, Ajitkumar Mulavara, Rachael D Seidler
Head-down tilt bed rest (HDBR) has been used as a spaceflight analog to study some of the effects of microgravity on human physiology, cognition, and sensorimotor functions. Previous studies have reported declines in balance control and functional mobility after spaceflight and HDBR. Here we investigated how the brain activation for foot movement changed with HDBR. Eighteen healthy men participated in the current HDBR study. They were in a 6{degree sign} head-down tilt position continuously for 70 days. Functional MRI scans were acquired to estimate brain activation for foot movement pre-, during- and post-HDBR...
February 28, 2018: Journal of Neurophysiology
Cláudia S Baptista, Carla Monteiro, Hélder Fernandes, Ana Canadas, Luísa Guardão, Joana C Santos
BACKGROUND: In birds there are reports of intracranial lesions but not of the clinical, computed tomographic and histopathologic features of acute intraparenchymal cerebral haemorrhage in Iberian golden eagle. CASE PRESENTATION: The following report describes a case of a 30-year-old Iberian golden eagle (Aquila chrysaetos homeyeri) with no history of trauma, presented with acute opisthotonus, left head tilt and circling, anisocoria, positional nystagmus, and ataxia...
February 27, 2018: BMC Veterinary Research
Sung-Hee Kim, Ji-Soo Kim
Objective: Internal representation of gravity can be quantified by measuring the subjective visual vertical (SVV). Modulation of verticality perception during head tilts may be perturbed in vestibular disorders causing SVV tilts in the upright head position. This study aimed to determine the influence of head tilts on the estimation of SVV in acute vestibular disorders. Methods: We measured the SVV in 37 patients with acute vestibular symptoms due to unilateral vestibular neuritis (VN) ( n  = 28) and lateral medullary infarction (LMI) ( n  = 9)...
2018: Frontiers in Neurology
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