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pupillary dilatation reflex

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https://www.readbyqxmd.com/read/29756058/pupillary-dilation-reflex-and-pupillary-pain-index-evaluation-during-general-anaesthesia-a-pilot-study
#1
Davina Wildemeersch, Michiel Baeten, Natasja Peeters, Vera Saldien, Marcel Vercauteren, Guy Hans
Background: Pupillary response by pupillary dilatation reflex (PDR) is a robust reflex, even measurable during general anaesthesia. However, the ability of infrared pupillometry to detect PDR differences obtained by intraoperative opioid administration in anaesthesized patients remains largely unknown. We analyzed the performance of automated infrared pupillometry in detecting differences in pupillary dilatation reflex response by a inbuilt standardized nociceptive stimulation program in patients under general anesthesia with a standardized propofol/fentanyl scheme...
April 2018: Romanian Journal of Anaesthesia and Intensive Care
https://www.readbyqxmd.com/read/29678713/posterior-fossa-epidural-hematomas-a-rare-but-serious-complication-of-occipito-cervical-fusion-surgery
#2
Chang Rong Zhu, Jianhua Wang, Dai Jianqiang, Kun Chen, Xia Hong
BACKGROUND: Posterior occipito-cervical fusion surgery is a commonly used surgical method to treat various craniovertebral junction pathologies. Though it is an effective method, there also have been some reports about complications of occipito-cervical fusion. However, there have been no reports about posterior fossa epidural hematomas after occipito-cervical fusion. CASE DESCRIPTION: A 44-year-old female was referred to our Hospital with a 6-month history of neck pain and numbness limbs for 2 months...
April 17, 2018: World Neurosurgery
https://www.readbyqxmd.com/read/29671874/pain-assessment-by-pupil-dilation-reflex-in-response-to-noxious-stimulation-in-anaesthetized-adults
#3
D Wildemeersch, N Peeters, V Saldien, M Vercauteren, G Hans
BACKGROUND: In response to noxious stimulation, pupillary dilation reflex (PDR) occurs even in anaesthetized patients. The aim of the study was to evaluate the ability of pupillometry with an automated increasing stimulus intensity to monitor intraoperative opioid administration. METHODS: Thirty-four patients undergoing elective surgery were enrolled. Induction by propofol anaesthesia was increased progressively until the sedation depth criteria (SeD) were attained...
April 19, 2018: Acta Anaesthesiologica Scandinavica
https://www.readbyqxmd.com/read/29661162/the-cold-pressor-test-in-interictal-migraine-patients-different-parasympathetic-pupillary-response-indicates-dysbalance-of-the-cranial-autonomic-nervous-system
#4
Ozan E Eren, Ruth Ruscheweyh, Christoph Schankin, Florian Schöberl, Andreas Straube
BACKGROUND: Data on autonomic nervous system (ANS) activations in migraine patients are quite controversial, with previous studies reporting over- and underactivation of the sympathetic as well as parasympathetic nervous system. In the present study, we explicitly aimed to assess the cranial ANS in migraine patients compared to healthy controls by applying the cold pressor test to a cohort of migraine patients in the interictal phase and measuring the pupillary response. METHODS: In this prospective observational study, a strong sympathetic stimulus was applied to 20 patients with episodic migraine in the interictal phase and 20 matched controls without migraine, whereby each participant dipped the left hand into ice-cold (4 °C) water for a maximum of 5 min (cold pressor test)...
April 16, 2018: BMC Neurology
https://www.readbyqxmd.com/read/29534018/eyeing-up-the-future-of-the-pupillary-light-reflex-in-neurodiagnostics
#5
REVIEW
Charlotte A Hall, Robert P Chilcott
The pupillary light reflex (PLR) describes the constriction and subsequent dilation of the pupil in response to light as a result of the antagonistic actions of the iris sphincter and dilator muscles. Since these muscles are innervated by the parasympathetic and sympathetic nervous systems, respectively, different parameters of the PLR can be used as indicators for either sympathetic or parasympathetic modulation. Thus, the PLR provides an important metric of autonomic nervous system function that has been exploited for a wide range of clinical applications...
March 13, 2018: Diagnostics
https://www.readbyqxmd.com/read/29516414/using-task-effort-and-pupil-size-to-track-covert-shifts-of-visual-attention-independently-of-a-pupillary-light-reflex
#6
Andreas Brocher, Raphael Harbecke, Tim Graf, Daniel Memmert, Stefanie Hüttermann
We tested the link between pupil size and the task effort involved in covert shifts of visual attention. The goal of this study was to establish pupil size as a marker of attentional shifting in the absence of luminance manipulations. In three experiments, participants evaluated two stimuli that were presented peripherally, appearing equidistant from and on opposite sides of eye fixation. The angle between eye fixation and the peripherally presented target stimuli varied from 12.5° to 42.5°. The evaluation of more distant stimuli led to poorer performance than did the evaluation of more proximal stimuli throughout our study, confirming that the former required more effort than the latter...
March 7, 2018: Behavior Research Methods
https://www.readbyqxmd.com/read/29481429/pupillary-dilation-reflex-measurement-ideal-time-pre-or-postsurgery
#7
Bharat Paliwal, Pradeep Bhatia, Narender Kaloria, Komal Chopra
No abstract text is available yet for this article.
May 2018: Anesthesia and Analgesia
https://www.readbyqxmd.com/read/29454810/predictors-of-functional-outcome-after-hanging-injury
#8
Chia-Lung Kao, I-Lin Hsu
PURPOSE: Suicide becomes a serious problem in today's society and hanging is a common method of suicide. We want to find the factors which can predict the final functional outcomes of these cases. METHODS: All patients who presented to Accident and Emergency Department (ED) of the National Cheng Kung University Hospital from 1st January 2005 to 31th December 2013 with a hanging injury were included in this study. All cases were divided into good outcome group and bad outcome group according to Glasgow Outcome Scale (GOS)...
April 2018: Chinese Journal of Traumatology, Zhonghua Chuang Shang za Zhi
https://www.readbyqxmd.com/read/29207745/bilateral-persistent-hyperplastic-primary-vitreous-a-rare-case-report
#9
Rashmi Kumari, Bhawesh Chandra Saha
Persistent Hyperplastic Primary Vitreous (PHPV), now-a-days referred to as Persistent Fetal Vasculature (PFV), is a rare congenital anomaly of the eye that typically presents unilaterally with white pupillary reflex and microphthalmia without systemic associations. Bilateral presentations are rare. Here we report a case of 15-year-old male with bilateral PFV without leucokoria who was misdiagnosed as congenital esotropia with amblyopia, treated for refractive errors and referred to higher centre for squint corrections...
September 2017: Journal of Clinical and Diagnostic Research: JCDR
https://www.readbyqxmd.com/read/29049405/differences-in-pupillary-light-reflex-between-optic-neuritis-and-ischemic-optic-neuropathy
#10
Yung Ju Yoo, Jeong-Min Hwang, Hee Kyung Yang
OBJECTIVES: To determine the differences in pupillary light reflex (PLR) between the acute and chronic phases of optic neuritis (ON) and nonarteritic anterior ischemic optic neuropathy (NAION). METHODS: The study included 30 patients with ON and 22 patients with NAION whose PLR were measured by a dynamic pupillometer (PLR-200; NeurOptics Inc., Irvine, USA). Age-matched controls included 58 healthy individuals with normal vision and optic nerve function. Pupil diameters, latency, constriction ratio, constriction velocity and dilation velocity were noted...
2017: PloS One
https://www.readbyqxmd.com/read/29043601/pupillary-reflex-dilation-in-response-to-incremental-nociceptive-stimuli-in-patients-receiving-intravenous-ketamine
#11
Nada Sabourdin, Thomas Giral, Risa Wolk, Nicolas Louvet, Isabelle Constant
Pupillometry is a non-invasive monitoring technique, which allows dynamic pupillary diameter measurement by an infrared camera. Pupillary diameter increases in response to nociceptive stimuli. In patients anesthetized with propofol or volatile agents, the magnitude of this pupillary dilation is related to the intensity of the stimulus. Pupillary response to nociceptive stimuli has never been studied under ketamine anesthesia. Our objective was to describe pupillary reflex dilation after calibrated tetanic stimulations in patients receiving intravenous ketamine...
October 17, 2017: Journal of Clinical Monitoring and Computing
https://www.readbyqxmd.com/read/29026665/lasting-bilateral-mydriasis-after-traumatic-brain-injury-may-not-always-be-a-lost-case
#12
Alkinoos Athanasiou, Ioannis Balogiannis, Ioannis Magras
BACKGROUND: Lasting bilateral mydriasis and absence of pupillary light reflex following severe traumatic brain injury (TBI) are considered signs of irreversible brainstem damage and have been strongly associated with poor outcome. CASE DESCRIPTION: A young female patient presented with severe TBI, contusions, and diffuse brain edema. She was initially treated medically, but developed delayed secondary refractory intracranial hypertension and bilaterally dilated, non-reactive pupils for 12 h...
2017: Surgical Neurology International
https://www.readbyqxmd.com/read/28991339/pupil-dynamics-induced-by-light-reflex-after-posterior-chamber-phakic-intraocular-lens-implantation
#13
Kazuko Totsuka, Hitoshi Ishikawa, Kazutaka Kamiya, Nobuyuki Shoji, Kimiya Shimizu
PURPOSE: To assess the light reflex of the pupil after Implantable Collamer Lens (ICL) (KS-aquaPORT; STAAR Surgical, Nidau, Switzerland) implantation to determine whether the ICL implantation might affect the pupil dynamics. METHODS: This study examined 28 eyes of 28 consecutive patients who underwent implantation of the posterior phakic ICL for the correction of myopia and astigmatism. Patient age at the time of surgery was 31.1 ± 6.8 years (range: 25 to 42 years)...
October 1, 2017: Journal of Refractive Surgery
https://www.readbyqxmd.com/read/28953489/effects-of-ketamine-on-pupillary-reflex-dilation-a-case-report
#14
Sérgio Vide, Catarina M Costa, Pedro L Gambus, Pedro P Amorim
Ketamine is an important component of multimodal treatment and a commonly used anesthetic drug. However, its analgesic effects have not been fully assessed intraoperatively because of difficulties in measuring this effect. In this case report, a woman underwent general anesthesia with ketamine and its pupillary reflexes were measured to detect autonomic changes in response to pain. With increasing doses of ketamine, the pupillary light reflex and the pupillary dilation response decreased. This could be caused by N-methyl-D-aspartate receptor antagonism in the pupillary reflexes pathway or by the analgesic effects of ketamine...
September 26, 2017: A & A Case Reports
https://www.readbyqxmd.com/read/28948056/could-hallucinogens-induce-permanent-pupillary-changes-in-ab-users-a-case-report-from-new-zealand
#15
Ahmed Al-Imam
An eighteen-year-old female patient of the Caucasian ethnicity from Australasia presented with a persistently dilated pupil causing her discomfort and occasional burning sensation when she is outdoors due to oversensitivity to sunlight. However, her pupillary reaction to light (pupillary light reflex) was intact. The patient is a known user of psychedelic substances (entheogens) including LSD, NBOMe, psilocybin, and DMT. The condition affects both eyes to the same extent. Thorough medical, neurological, and radiological examinations, including an EEG and an MRI of the head and neck region, were completely normal...
2017: Case Reports in Neurological Medicine
https://www.readbyqxmd.com/read/28864843/pupillary-autonomic-dysfunction-in-patients-with-anca-associated-vasculitis
#16
Philipp Moog, O Eren, S Kossegg, K Valda, A Straube, M Grünke, H Schulze-Koops, M Witt
OBJECTIVE: To assess autonomic function by infrared dynamic pupillometry in patients with ANCA-vasculitis (AAV) in correlation to autonomic symptoms, disease specific clinical parameters and cardiovascular reflex tests. METHODS: Patients with AAV and healthy controls underwent pupillometry at rest and after sympathetic stimulation (cold pressor test). Three parasympathetic parameters (amplitude, relative amplitude, maximum constriction velocity) and one sympathetic parameter (late dilatation velocity) were assessed...
December 2017: Clinical Autonomic Research: Official Journal of the Clinical Autonomic Research Society
https://www.readbyqxmd.com/read/28807373/usefulness-of-cocaine-drops-in-investigating-infant-anisocoria
#17
Gilles C Martin, Pierre-Antoine Aymard, Charlotte Denier, Caroline Seghir, Marc Abitbol, Nathalie Boddaert, Dominique Bremond-Gignac, Matthieu P Robert
INTRODUCTION: Whereas apraclonidine has eclipsed cocaine test in the exploration of unilateral miosis in adults, its use in infants is avoided because of the risk of central nervous system depression. This chart review evaluates the usefulness of cocaine drops in infants. METHODS: Infants under the age of one referred for unilateral miosis between November 1, 2009 and November 1, 2015, were reviewed. Patients underwent the following protocol: (1) in case of isolated miosis, cocaine test was performed...
November 2017: European Journal of Paediatric Neurology: EJPN
https://www.readbyqxmd.com/read/28756328/comparison-of-three-stimulation-sites-on-the-pupillary-dilation-reflex-amplitude-evoked-by-a-standardized-noxious-test
#18
Florian Roquet, Laila Guezouli, Bozena Wachowska, Iulia Balcan, Philippe Montravers, Dan Longrois, Jean Guglielminotti
No abstract text is available yet for this article.
December 2017: Anaesthesia, Critical Care & Pain Medicine
https://www.readbyqxmd.com/read/28716667/pupillometric-evaluation-of-the-melanopsin-containing-retinal-ganglion-cells-in-mitochondrial-and-non-mitochondrial-optic-neuropathies
#19
Shakoor Ba-Ali, Henrik Lund-Andersen
In recent years, chromatic pupillometry is used in humans to evaluate the activity of melanopsin expressing intrinsic photosensitive retinal ganglion cells (ipRGCs). Blue light is used to stimulate the ipRGCs and red light activates the rod/cone photoreceptors. The late re-dilation phase of pupillary light reflex is primarily driven by the ipRGCs. Optic neuropathies i.e. Leber hereditary optic neuropathy (LHON), autosomal dominant optic atrophy (ADOA), nonarteritic anterior ischemic optic neuropathy (NAION), glaucoma, optic neuritis and idiopathic intracranial hypertension (IIH) are among the diseases, which have been subject to pupillometric studies...
July 14, 2017: Mitochondrion
https://www.readbyqxmd.com/read/28575101/efficacy-of-digital-pupillometry-for-diagnosis-of-horner-syndrome
#20
Yung Ju Yoo, Hee Kyung Yang, Jeong-Min Hwang
OBJECTIVES: To evaluate the efficacy of digital pupillometry in the diagnosis of anisocoria related to Horner syndrome in adult patients. DESIGN: Retrospective, observational, case control study. METHODS: Nineteen patients with unilateral Horner syndrome (Horner group) and age-matched controls of 30 healthy individuals with normal vision and neither optic nerve dysfunction nor pupillary abnormalities were included. Pupillary light reflex (PLR) of the Horner group and controls were measured by a dynamic pupillometer (PLR-200; NeurOptics Inc...
2017: PloS One
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