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https://www.readbyqxmd.com/read/28532347/strabismus-and-the-oculomotor-system-insights-from-macaque-models
#1
Vallabh E Das
Disrupting binocular vision in infancy leads to strabismus and oftentimes to a variety of associated visual sensory deficits and oculomotor abnormalities. Investigation of this disorder has been aided by the development of various animal models, each of which has advantages and disadvantages. In comparison to studies of binocular visual responses in cortical structures, investigations of neural oculomotor structures that mediate the misalignment and abnormalities of eye movements have been more recent, and these studies have shown that different brain areas are intimately involved in driving several aspects of the strabismic condition, including horizontal misalignment, dissociated deviations, A and V patterns of strabismus, disconjugate eye movements, nystagmus, and fixation switch...
October 14, 2016: Annual Review of Vision Science
https://www.readbyqxmd.com/read/28530253/sensitivity-and-specificity-of-vestibular-bedside-examination-in-detecting-viii-cranial-nerve-schwannoma-with-sensorineural-sudden-unilateral-hearing-loss-as-presenting-symptom
#2
L Califano, F Salafia, M G Melillo, S Mazzone
The objectives of this study were to identify signs of vestibular nerve suffering through a bedside vestibular examination protocol in case of sudden sensorineural unilateral hearing loss without spontaneous signs of vestibular impairment and to propose a bed-side vestibular examination based protocol for the focused execution of gadolinium-enhanced magnetic resonance imaging (MRI) only if a vestibular schwannoma is suspected. 96 patients, 52 men, 44 women, mean age 57.73 +/- 12.85 years, suffering from sudden sensorineural unilateral hearing loss, which presented neither vertigo nor spontaneous nystagmus, were enrolled...
May 22, 2017: Acta Otorhinolaryngologica Italica
https://www.readbyqxmd.com/read/28529496/treatment-of-the-mal-de-debarquement-syndrome-a-1-year-follow-up
#3
Mingjia Dai, Bernard Cohen, Catherine Cho, Susan Shin, Sergei B Yakushin
The mal de debarquement syndrome (MdDS) is a movement disorder, occurring predominantly in women, is most often induced by passive transport on water or in the air (classic MdDS), or can occur spontaneously. MdDS likely originates in the vestibular system and is unfamiliar to many physicians. The first successful treatment was devised by Dai et al. (1), and over 330 MdDS patients have now been treated. Here, we report the outcomes of 141 patients (122 females and 19 males) treated 1 year or more ago. We examine the patient's rocking frequency, body drifting, and nystagmus...
2017: Frontiers in Neurology
https://www.readbyqxmd.com/read/28520619/late-efavirenz-induced-ataxia-and-encephalopathy-a-case-series
#4
Ebrahim Variava, Farai R Sigauke, Jennifer Norman, Modiehi Rakgokong, Petudzai Muchichwa, Andre Mochan, Gary Maartens, Neil A Martinson
BACKGROUND: WHO treatment guidelines recommend efavirenz in first line antiretroviral therapy (ART). Efavirenz commonly causes early transient neuro-psychiatric adverse events. We present 20 cases with severe encephalopathy accompanied by ataxia due to efavirenz toxicity METHODS:: Consecutive HIV-infected adults taking efavirenz-containing ART admitted to Tshepong hospital, Klerksdorp, South Africa with ataxia and encephalopathy were included in this case series. RESULTS: We identified 20 women admitted to hospital with severe ataxia...
May 17, 2017: Journal of Acquired Immune Deficiency Syndromes: JAIDS
https://www.readbyqxmd.com/read/28512444/longitudinal-quantification-of-eye-movement-impairments-after-pontine-hemorrhage
#5
Melis Suner, Glen T Prusky, Jason B Carmel, N Jeremy Hill
INTRODUCTION: We report a case of hypertrophic olivary degeneration due to pontine hemorrhage. A 59-year-old male with untreated hypertension suffered a primary pontine hemorrhage, which caused horizontal eye-movement limitation. Progressive neurological deterioration with involuntary eye and palatal movements began months after hemorrhage. This was accompanied by magnetic resonance imaging evidence of hypertrophic olivary degeneration at 4.5 months. BACKGROUND: Primary pontine hemorrhage often leads to impairment of eye movements and diplopia...
2017: Frontiers in Neurology
https://www.readbyqxmd.com/read/28509138/juvenile-nephronophthisis-and-dysthyroidism-a-rare-association
#6
Fateme Shamekhi Amiri, Ariana Kariminejad
Nephronophthisis, an autosomal recessive kidney disease, represents the most frequent genetic cause of end-stage kidney disease in the first three decades of life. A 27-year-old male was presented with gait imbalance, sever pruritus since 10 days prior time of admission. In past medical history, he had bilateral cataract, torsional nystagmus, and bilateral optic nerve atrophy since 2 years of age. He was also mentioned history of multinodular goiter with dysfunctional thyroid state since 2 years before admission...
May 2017: CEN Case Reports
https://www.readbyqxmd.com/read/28502398/correlations-between-individual-susceptibility-to-visually-induced-motion-sickness-and-decaying-time-constant-of-after-nystagmus
#7
Coco C T Guo, Daniel J Z Chen, Isabella Y Wei, Richard H Y So, Raymond T F Cheung
This study examines the correlations between optokinetic after-nystagmus (OKAN) parameters and individual susceptibility to visually induced motion sickness (VIMS). Twenty-seven participants were exposed to vertical black-and-white stripes drifting along the yaw axis at 60° per second for 30 min to collect individual VIMS data (Phase 1). Two weeks after the exposure, OKANs were measured (Phase 2). 19 out of 27 participants (i.e., 70%) exhibited consistent OKAN patterns. Significant correlations between the time constants of OKAN and levels of VIMS experienced by the same viewers were found...
September 2017: Applied Ergonomics
https://www.readbyqxmd.com/read/28501391/long-term-visual-acuity-strabismus-and-nystagmus-outcomes-following-multimodality-treatment-in-group-d-retinoblastoma-eyes
#8
Ido D Fabian, Zishan Naeem, Andrew W Stacey, Tanzina Chowdhury, Catriona Duncan, M Ashwin Reddy, Mandeep S Sagoo
PURPOSE: To analyse the long-term visual acuity, strabismus and nystagmus outcomes in Group D retinoblastoma following multimodality treatments in a national retinoblastoma referral centre. DESIGN: Retrospective interventional case series. METHODS: A 13-year retrospective chart review of Group D eyes treated initially with intravenous chemotherapy (IVC) and followed-up for at least 1 year from last treatment. Risk factors for final visual acuity (VA) were analysed, and rate of strabismus and nystagmus at last follow-up visit were calculated...
May 10, 2017: American Journal of Ophthalmology
https://www.readbyqxmd.com/read/28497078/joubert-syndrome-misleading-presentation-of-two-cases-as-pseudo-tumor-cerebri-and-literature-review
#9
Farrokh Seylanian Toosi, Samineh Boloursaz, Bita Abbasi, Reza Hekmat, Reihaneh Mortazavi Ardestani, Mina Mohajerzadeh
Joubert syndrome is a rare autosomal recessive disorder that may have different clinical presentation such as ataxia, hyperpnea, sleep apnea, nystagmus, hypotonia, seizure and retinitis pigmentosa. We present a 22-year-old girl and her older sibling, labeled as cerebral palsy. She had renal transplant years ago without the true diagnosis of the disorder. Brain imaging revealed the classic "molar tooth sign" appearance, and clinical evaluation established the diagnosis for both of the siblings. Imaging should be done to evaluate the neuroradiological findings of Joubert syndrome...
2017: Journal of Renal Injury Prevention
https://www.readbyqxmd.com/read/28493820/deoxyguanosine-kinase-deficiency-a-report-of-four-patients
#10
Özlem Ünal, Burcu Hişmi, Mustafa Kılıç, Hayriye Hızarcıoğlu Gülşen, Turgay Coşkun, Serap Hatice Sivri, Ali Dursun, Aysel Yüce, Ayşegül Tokatlı
BACKGROUND: Hepatic involvement is a common feature in childhood mitochondrial disorders. Deoxyguanosine kinase (DGUOK) deficiency is one of the mitochondrial DNA depletion syndromes associated with hepatocerebral syndrome. Hepatic disease and neurologic dysfunction occurs within weeks after birth. Low birth weight is one of the common features. This study aims to describe the clinical and laboratory features of four infants carrying four different pathogenic variants in the DGUOK gene...
May 11, 2017: Journal of Pediatric Endocrinology & Metabolism: JPEM
https://www.readbyqxmd.com/read/28491015/protocols-for-visually-guided-navigation-assessment-of-efficacy-of-retina-directed-cell-or-gene-therapy-in-canines
#11
Puya Aravand, Pavitra S Ramachandran, Ivan Schpylchak, Nicholas T Phelps, Sergei Nikonov, Jean Bennett
There has been marked progress in recent years in developing gene delivery approaches for the treatment of inherited blinding diseases. Many of the proof-of-concept studies have utilized rodent models of retinal degeneration. In those models, tests of visual function include a modified water maze swim test, optokinetic nystagmus, and light-dark activity assays. Test paradigms used in rodents can be difficult to replicate in large animals due to their size and awareness of non-visual aspects of the test system...
2017: Frontiers in Neuroscience
https://www.readbyqxmd.com/read/28488383/pax6-allelic-heterogeneity-in-mexican-congenital-aniridia-patients-expanding-the-mutational-spectrum-with-7-novel-pathogenic-variants
#12
Sofía Pérez-Solórzano, Oscar F Chacón-Camacho, Mirena C Astiazarán, Gerardo Ledesma-Gil, Juan Carlos Zenteno
IMPORTANCE: To describe the clinical characteristics and mutational analysis of Mexican patients with aniridia and PAX6 mutations. BACKGROUND: Aniridia is a panocular hereditary eye disease caused by mutations in the PAX6 transcription factor. Mutation detection rate is highly variable ranging from 30 to 90% in different populations. Very few studies have been published about the PAX6 mutational analysis in aniridia patients from Mexico. In order to establish a more representative PAX6 mutational frequency in the country, a cohort of 22 Mexican unrelated aniridia probands were analyzed in this study...
May 9, 2017: Clinical & Experimental Ophthalmology
https://www.readbyqxmd.com/read/28484820/-vertigo-and-dizziness-in-the-emergency-room
#13
REVIEW
A Zwergal, K Möhwald, M Dieterich
Vertigo and dizziness are among the most common chief complaints in the emergency department. Etiologies can be categorized into three subgroups: neurootological (vestibular), medical (especially cardiovascular, metabolic), and psychiatric disorders. The diagnostic approach in the emergency department is based on a systematic analysis of case history (type, time course of symptoms, modulating factors, associated symptoms), clinical examination of the vestibular, ocular motor, and cerebellar systems (head impulse test, nystagmus, skew deviation, positioning maneuver, test of gait and stance), as well as a basal monitoring (vital signs, 12-lead ECG, blood tests)...
May 8, 2017: Der Nervenarzt
https://www.readbyqxmd.com/read/28481040/optical-coherence-tomography-morphology-and-evolution-in-cblc-disease-related-maculopathy-in-a-case-series-of-very-young-patients
#14
Giacomo M Bacci, Maria A Donati, Elisabetta Pasquini, Francis Munier, Catia Cavicchi, Amelia Morrone, Andrea Sodi, Vittoria Murro, Nuria Garcia Segarra, Claudio Defilippi, Leonardo Bussolin, Roberto Caputo
PURPOSE: To describe the retinal structure of a group of patients affected by methylmalonic aciduria with homocystinuria cblC type, caused by mutations in the MMACHC gene, using spectral domain optical coherence tomography (SD-OCT). METHODS: Young patients (n = 11, age 0-74 months) with cblC disease, detected by newborn screening or clinically diagnosed within 40 days of life, underwent molecular analysis and complete ophthalmic examination, including fundus photography and SD-OCT...
May 8, 2017: Acta Ophthalmologica
https://www.readbyqxmd.com/read/28480854/unusual-manifestation-of-neuroboreliosis-case-report
#15
M Beridze, N Khizanishvili, M Mdivani, O Samushia, N Gogokhia
The paper reported the verified case of neuroboreliosis with unusual clinical presentation of Parkinsonism. Study aimed at establishing the significance of a precise differential diagnosis with substantial analysis of the symptoms of several diseases to avoid the false diagnosis and to conduct the opportune and adequate therapeutic management. We described the case of the diagnosed neuroboreliosis with clinical expression of Multiple Sclerosis (MS) and Parkinsonism. A 44 years old man was diagnosed as MS according to the McDonald's Criteria, who within two years developed typical clinical signs of Parkinsonism...
March 2017: Georgian Medical News
https://www.readbyqxmd.com/read/28473800/central-positional-nystagmus-a-systematic-literature-review
#16
REVIEW
Nora K Macdonald, Diego Kaski, Yougan Saman, Amal Al-Shaikh Sulaiman, Amal Anwer, Doris-Eva Bamiou
OBJECTIVE: To provide a systematic review of the clinical and radiological features of lesion-induced central positional nystagmus (CPN) and identify salient characteristics that differentiate central from peripheral positional nystagmus (PN). METHODS: Systematic literature search according to the preferred reporting items for systematic reviews and meta-analysis. RESULTS: A total of 82 patients from 28 studies met the participants intervention, comparison, outcomes, and study designs criteria for inclusion...
2017: Frontiers in Neurology
https://www.readbyqxmd.com/read/28463578/comparison-of-naso-temporal-asymmetry-during-monocular-smooth-pursuit-optokinetic-nystagmus-and-ocular-following-response-in-strabismic-monkeys
#17
Anand C Joshi, Mehmet N Agaoglu, Vallabh E Das
PURPOSE: Under monocular viewing conditions, humans and monkeys with infantile strabismus exhibit asymmetric naso-temporal (N-T) responses to motion stimuli. The goal of this study was to compare and contrast these N-T asymmetries during 3 visually mediated eye tracking tasks-optokinetic nystagmus (OKN), smooth pursuit (SP) response, and ocular following responses (OFR). METHODS: Two adult strabismic monkeys were tested under monocular viewing conditions during OKN, SP, or OFR stimulation...
May 2, 2017: Strabismus
https://www.readbyqxmd.com/read/28460653/evolution-and-persistence-of-torsional-downbeat-nystagmus-in-lateral-medullary-infarction
#18
Seong-Hae Jeong, Hyun-Jin Jo, Ae Young Lee, Jae Moon Kim, Ji-Soo Kim, Min Kyun Sohn
No abstract text is available yet for this article.
May 2, 2017: Canadian Journal of Neurological Sciences. le Journal Canadien des Sciences Neurologiques
https://www.readbyqxmd.com/read/28457292/visual-outcomes-of-patients-presenting-with-bilateral-infantile-cataracts-and-nystagmus
#19
Charlene Crockett, Kathryn A Camero, Lingkun Kong, Kimberly G Yen
OBJECTIVE: To evaluate the outcomes of cataract surgery in pediatric patients presenting with bilateral infantile cataracts and nystagmus. DESIGN: Retrospective case study. PARTICIPANTS: Thirteen pediatric patients who presented between September 2002 and February 2014 at a single tertiary care institution. METHODS: Patients were included if they presented with bilateral visually significant cataracts and preoperative manifest nystagmus and had no other systemic or ocular condition that could explain the presence of the nystagmus...
April 2017: Canadian Journal of Ophthalmology. Journal Canadien D'ophtalmologie
https://www.readbyqxmd.com/read/28452866/effects-of-dopamine-and-norepinephrine-on-exercise-induced-oculomotor-fatigue
#20
Charlotte J W Connell, Benjamin Thompson, Jason Turuwhenua, Alexa Srzich, Nicholas Gant
INTRODUCTION: Fatigue-induced impairments in the control of eye movements are detectable via reduced eye movement velocity following a bout of prolonged, strenuous exercise. Slower eye movements caused by neural fatigue within the oculomotor system can be prevented by caffeine and upregulation of central catecholamines may be responsible for this effect. This study explored the individual contribution of dopamine and norepinephrine to fatigue-related impairments in oculomotor control...
April 28, 2017: Medicine and Science in Sports and Exercise
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