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Mechanism of Central Hypopnoea Induced by Organic Phosphorus
www.nature.com/scientificreports OPEN Mechanism of central hypopnoea induced by organic phosphorus poisoning Kazuhito Nomura*, Eichi Narimatsu, Hiroyuki Inoue, Ryoko Kyan, Keigo Sawamoto, Shuji Uemura, Ryuichiro Kakizaki & Keisuke Harada Whether central apnoea or hypopnoea can be induced by organophosphorus poisoning remains unknown to date. By using the acute brainstem slice method and multi-electrode array system, we established a paraoxon (a typical acetylcholinesterase inhibitor) poisoning model to investigate the time-dependent changes in respiratory burst amplitudes of the pre-Bötzinger complex (respiratory rhythm generator). We then determined whether pralidoxime or atropine, which are antidotes of paraoxon, could counteract the efects of paraoxon. Herein, we showed that paraoxon signifcantly decreased the respiratory burst amplitude of the pre-Bötzinger complex (p < 0.05). Moreover, pralidoxime and atropine could suppress the decrease in amplitude by paraoxon (p < 0.05). Paraoxon directly impaired the pre-Bötzinger complex, and the fndings implied that this impairment caused central apnoea or hypopnoea. Pralidoxime and atropine could therapeutically attenuate the impairment. This study is the frst to prove the usefulness of the multi-electrode array method for electrophysiological and toxicological studies in the mammalian brainstem. Te pre-Bötzinger complex (preBötC) in the ventrolateral lower brainstem is essential for the formation of the unconscious breathing rhythm in mammals1,2. Tis is because the cyclic burst excitation generated from preBötC synchronizes with the respiratory rhythm through phrenic nerve fring and the diaphragmatic contractions, and destruction of preBötC causes the disappearance of the rhythm. Periodic respiratory burst excitation has also been confrmed from an island specimen derived by isolating preBötC in an island shape to block input from other neurons2. -
Professor Jo Klaveness School of Pharmacy University of Oslo
SUPERVISORS Professor Jo Klaveness School of Pharmacy University of Oslo Associate professor Pål Rongved School of Pharmacy University of Oslo 1 TABLE OF CONTENTS TABLE OF CONTENTS 1 ABBREVIATIONS..........................................................................5 2 ABSTRACT.....................................................................................6 3 INTRODUCTION............................................................................7 3.1 Acetylcholine- a neurotransmitter Synthesis, release and inactivation ... 7 3.1.1 Structure of acetylcholinesterase .................................................................... 8 3.2 Anticholinesterases interfere with acetylcholine activity ........................ 9 3.3 Effects of anticholinesterases................................................................... 9 3.4 Different groups of anticholinesterases.................................................. 10 3.4.1 Short- acting anticholinesterases .................................................................. 10 3.4.2 Medium- duration anticholinesterases .......................................................... 11 3.4.3 Irreversible anticholinesterases..................................................................... 12 3.5 Nerve agents: Irreversible anticholinesterases....................................... 13 3.5.1 The dawn of a deadly weapon ...................................................................... 14 3.5.2 Biochemistry................................................................................................ -
Demecarium Bromide/Homatropine 1881
Demecarium Bromide/Homatropine 1881 Dyflos (BAN) junctival injection of pralidoxime has been used to reverse severe ocular adverse effects. Supportive treatment, including assisted DFP; Difluorophate; Di-isopropyl Fluorophosphate; Di-isopro- ventilation, should be given as necessary. CH3 pylfluorophosphonate; Fluostigmine; Isoflurofato; Isoflurophate. Di-isopropyl phosphorofluoridate. To prevent or reduce development of iris cysts in patients receiv- N ing ecothiopate eye drops, phenylephrine eye drops may be giv- C6H14FO3P = 184.1. en simultaneously. CAS — 55-91-4. ATC — S01EB07. Precautions ATC Vet — QS01EB07. As for Neostigmine, p.632. For precautions of miotics, see also OH under Pilocarpine, p.1885. In general, as with other long-acting anticholinesterases, ecothiopate should be used only where ther- O apy with other drugs has proved ineffective. Ecothiopate iodide CH3 should not be used in patients with iodine hypersensitivity. O O H3C O Interactions P CH3 As for Neostigmine, p.632. The possibility of an interaction re- O F mains for a considerable time after stopping long-acting anti- Homatropine Hydrobromide (BANM) CH3 cholinesterases such as ecothiopate. Homatr. Hydrobrom.; Homatropiinihydrobromidi; Homatropi- Pharmacopoeias. In US. Uses and Administration na, hidrobromuro de; Homatropine, bromhydrate d’; Homatro- USP 31 (Isoflurophate). A clear, colourless, or faintly yellow liq- Ecothiopate is an irreversible inhibitor of cholinesterase; its ac- pin-hidrobromid; Homatropinhydrobromid; Homatropin-hydro- uid. Specific gravity about 1.05. Sparingly soluble in water; sol- tions are similar to those of neostigmine (p.632) but much more bromid; Homatropini hydrobromidum; Homatropinium Bro- uble in alcohol and in vegetable oils. It is decomposed by mois- prolonged. Its miotic action begins within 1 hour of its applica- mide; Homatropino hidrobromidas; Homatropinum Bromatum; ture with the evolution of hydrogen fluoride. -
Chapter 6 PRETREATMENT for NERVE AGENT EXPOSURE
Pretreatment for Nerve Agent Exposure Chapter 6 PRETREATMENT FOR NERVE AGENT EXPOSURE MICHAEL A. DUNN, M.D., FACP*; BRENNIE E. HACKLEY, JR., PH.D.†; AND FREDERICK R. SIDELL, M.D.‡ INTRODUCTION AGING OF NERVE AGENT–BOUND ACETYLCHOLINESTERASE PYRIDOSTIGMINE, A PERIPHERALLY ACTING CARBAMATE COMPOUND Efficacy Safety Wartime Use Improved Delivery CENTRALLY ACTING NERVE AGENT PRETREATMENTS NEW DIRECTIONS: BIOTECHNOLOGICAL PRETREATMENTS SUMMARY *Colonel, Medical Corps, U.S. Army; Director, Clinical Consultation, Office of the Assistant Secretary of Defense (Health Affairs), Washing- ton, D.C. 20301-1200; formerly, Commander, U.S. Army Medical Research Institute of Chemical Defense, Aberdeen Proving Ground, Mary- land 21010-5425 †Scientific Advisor, U.S. Army Medical Research Institute of Chemical Defense, Aberdeen Proving Ground, Maryland 21010-5425 ‡Formerly, Chief, Chemical Casualty Care Office, and Director, Medical Management of Chemical Casualties Course, U.S. Army Medical Research Institute of Chemical Defense, Aberdeen Proving Ground, Maryland 21010-5425; currently, Chemical Casualty Consultant, 14 Brooks Road, Bel Air, Maryland 21014 181 Medical Aspects of Chemical and Biological Warfare INTRODUCTION Nerve agents are rapidly acting chemical com- cal as well and may impair physical and mental pounds that can cause respiratory arrest within performance. A pretreatment must be administered minutes of absorption. Their speed of action im- to an entire force under a nerve agent threat. Any poses a need for rapid and appropriate reaction by resulting performance decrement, even a compara- exposed soldiers, their buddies, or medics, who tively minor one, would make pretreatment use must administer antidotes quickly enough to save unacceptable in battlefield situations requiring lives. A medical defense against nerve agents that maximum alertness and performance for survival. -
Pharmacology of Ophthalmologically Important Drugs James L
Henry Ford Hospital Medical Journal Volume 13 | Number 2 Article 8 6-1965 Pharmacology Of Ophthalmologically Important Drugs James L. Tucker Follow this and additional works at: https://scholarlycommons.henryford.com/hfhmedjournal Part of the Chemicals and Drugs Commons, Life Sciences Commons, Medical Specialties Commons, and the Public Health Commons Recommended Citation Tucker, James L. (1965) "Pharmacology Of Ophthalmologically Important Drugs," Henry Ford Hospital Medical Bulletin : Vol. 13 : No. 2 , 191-222. Available at: https://scholarlycommons.henryford.com/hfhmedjournal/vol13/iss2/8 This Article is brought to you for free and open access by Henry Ford Health System Scholarly Commons. It has been accepted for inclusion in Henry Ford Hospital Medical Journal by an authorized editor of Henry Ford Health System Scholarly Commons. For more information, please contact [email protected]. Henry Ford Hosp. Med. Bull. Vol. 13, June, 1965 PHARMACOLOGY OF OPHTHALMOLOGICALLY IMPORTANT DRUGS JAMES L. TUCKER, JR., M.D. DRUG THERAPY IN ophthalmology, like many specialties in medicine, encompasses the entire spectrum of pharmacology. This is true for any specialty that routinely involves the care of young and old patients, surgical and non-surgical problems, local eye disease (topical or subconjunctival drug administration), and systemic disease which must be treated in order to "cure" the "local" manifestations which frequently present in the eyes (uveitis, optic neurhis, etc.). Few authors (see bibliography) have attempted an introduction to drug therapy oriented specifically for the ophthalmologist. The new resident in ophthalmology often has a vague concept of the importance of this subject, and with that in mind this paper was prepared. -
Galantamine 4Mg/Ml Oral Solution Package Leaflet
Package leaflet: Information for the user Galantamine 4mg/ml Oral Solution Read all of this leaflet carefully before you start taking this medicine because it contains important information for you. n Keep this leaflet. You may need to read it again. n If you have any further questions, ask your doctor or pharmacist. n This medicine has been prescribed for you only. Do not pass it on to others. It may harm them, even if their signs of illness are the same as yours. n If you get any side effects, talk to your doctor or pharmacist. This includes any possible side effects not listed in this leaflet. See section 4. What is in this leaflet: 1. What Galantamine Oral Solution is and what it is used for 2. What you need to know before you take Galantamine Oral Solution 3. How to take Galantamine Oral Solution 4. Possible side effects 5. How to store Galantamine Oral Solution 6. Contents of the pack and other information 1. What Galantamine Oral Solution is and what it is used for What your medicine is The full name of your medicine is Galantamine 4mg/ml Oral Solution. In this leaflet the shorter name Galantamine is used. Galantamine belongs to a group of medicines known as ‘anti-dementia’ medicines. What your medicine is used for Galantamine is used in adults to treat the symptoms of mild to moderately severe Alzheimer’s disease. This is a type of dementia that alters the way the brain works. Alzheimer’s disease causes memory loss, confusion and changes in behaviour, which make it increasingly difficult to carry out normal daily tasks. -
Efficacy of Trimedoxime in Mice Poisoned with Dichlorvos, Heptenophos Or Monocrotophos
CORE Metadata, citation and similar papers at core.ac.uk Provided by FarFar - Repository of the Faculty of Pharmacy, University of Belgrade C Basic & Clinical Pharmacology & Toxicology 2005, 96, 111–117. Printed in Denmark . All rights reserved Copyright C ISSN 1742-7835 Efficacy of Trimedoxime in Mice Poisoned with Dichlorvos, Heptenophos or Monocrotophos Biljana Antonijevic´1, Dubravko Bokonjic´2, Milosˇ P. Stojiljkovic´2, Vesna Kilibarda2, Zoran A. Milovanovic´2, Mirjana Nedeljkovic´1 and Matej Maksimovic´1 1Institute of Toxicological Chemistry, School of Pharmacy, University of Belgrade, Vojvode Stepe 450, and 2National Poison Control Centre, Military Medical Academy, Crnotravska 17; 11000 Belgrade, Serbia and Montenegro (Received June 18, 2004; Accepted September 3, 2004) Abstract: The aim of the study was to examine antidotal potency of trimedoxime in mice poisoned with three direct dimethoxy-substituted organophosphorus inhibitors. In order to assess the protective efficacy of trimedoxime against dichlorvos, heptenophos or monocrotophos, median effective doses and efficacy half-times were calculated. Trimedoxime (24 mg/kg intravenously) was injected 5 min. before 1.3 LD50 intravenously of poisons. Activities of brain, diaphragmal and erythrocyte acetylcholinesterase, as well as of plasma carboxylesterases were determined at different time intervals (10, 40 and 60 min.) after administration of the antidotes. Protective effect of trimedoxime decreased according to the following order: monocrotophos Ͼ heptenophos Ͼ dichlorvos. Administration of the oxime produced a significant reacti- vation of central and peripheral acetylcholinesterase inhibited with dichlorvos and heptenophos, with the exception of erythrocyte acetylcholinesterase inhibited by heptenophos. Surprisingly, trimedoxime did not induce reactivation of mon- ocrotophos-inhibited acetylcholinesterase in any of the tissues tested. -
Combined Pre-And Posttreatment of Paraoxon Exposure
molecules Article Combined Pre- and Posttreatment of Paraoxon Exposure Dietrich E Lorke 1,2,* , Syed M Nurulain 3 , Mohamed Y Hasan 4, Kamil Kuˇca 5 and Georg A Petroianu 2,6 1 Department of Anatomy and Cellular Biology, College of Medicine and Health Sciences, Khalifa University, P O Box 127788, Abu Dhabi, UAE 2 Herbert Wertheim College of Medicine, Department of Cellular Biology & Pharmacology, Florida International University, University Park GL 495, 11200 SW 8th St, Miami, FL 33199, USA; [email protected] 3 Bio Science Department, COMSATS Institute of Information Technology, Bio Sciences Block, CUI, Park Road, Tarlai Kalan, Islamabad 45550, Pakistan; [email protected] 4 Department of Pharmacology & Therapeutics, College of Medicine and Health Sciences, UAE University, Al Ain 15551, UAE; [email protected] 5 Department of Chemistry, Faculty of Science, University of Hradec Kralove, Rokitanského 62/26, 500 03 Hradec Kralove, Czech Republic; [email protected] 6 Department of Pharmacology, College of Medicine and Health Sciences, Khalifa University, P O Box 127788, Abu Dhabi, UAE * Correspondence: [email protected]; Tel.: +971-2-501-8381 Academic Editors: Pascal Houzé and Frédéric J. Baud Received: 5 March 2020; Accepted: 25 March 2020; Published: 27 March 2020 Abstract: Aims: Organophosphates (OPCs), useful agents as pesticides, also represent a serious health hazard. Standard therapy with atropine and established oxime-type enzyme reactivators is unsatisfactory. Experimental data indicate that superior therapeutic results can be obtained when reversible cholinesterase inhibitors are administered before OPC exposure. Comparing the protective efficacy of five such cholinesterase inhibitors (physostigmine, pyridostigmine, ranitidine, tacrine, or K-27), we observed best protection for the experimental oxime K-27. -
Problems with Botulinum Toxin Treatment in Mitochondrial Cytopathy
1594 J Neurol Neurosurg Psychiatry: first published as 10.1136/jnnp.2004.057661 on 14 October 2005. Downloaded from SHORT REPORT Problems with botulinum toxin treatment in mitochondrial cytopathy: case report and review of the literature T Gioltzoglou, C Cordivari, P J Lee, M G Hanna, A J Lees ............................................................................................................................... J Neurol Neurosurg Psychiatry 2005;76:1594–1596. doi: 10.1136/jnnp.2004.057661 We report two patients (a brother and sister) who had an Botulinum toxin type A (BTXA) is widely used in neurological unexpected reaction to botulinum toxin injections into their therapeutics for a variety of indications such as dystonia, parotid and submandibular glands for the treatment of spasticity, hyperhidrosis, and hypersalivation. It is relatively sialorrhoea. contraindicated in disorders of neuromuscular transmission, in individuals with known hypersensitivity or bleeding CASE REPORTS disorders, and during pregnancy. Two patients are presented Patient 1 with initially undetermined multisystem neurological disor- The first patient was a 30 year old man with an insidious ders and excessive sialorrhoea, later diagnosed as mito- onset of intellectual and movement disorders in infancy. He chondrial cytopathy, who had side effects after treatment had delayed motor and intellectual development. He was with ultrasound guided BTXA injections. Published reports on wheelchair bounded, while his language was limited to single the use of BTXA injections in hypersalivation of various words or simple phrases. He had good comprehension and causes are reviewed, along with the proposed mechanisms of memory, and normal sphincter function. He had no difficulty hypersensitivity to BTXA in patients with mitochondrial in swallowing. cytopathies. Clinicians should be cautious when using BTXA Neurologically, multiple systems were affected, resulting in injections in such patients because of the significant risk of spasticity, pigmentary changes in both eyes on fundoscopy, side effects. -
Mytelase (Ambenonium Chloride) Tablets Label
NDA 010155/S-022 NDA 010155/ S-023 FDA Approved Labeling Text dated 11/10/2011 Page 1 MYTELASE® AMBENONIUM CHLORIDE DESCRIPTION MYTELASE, brand of ambenonium chloride, is [Oxalylbis (iminoethylene)] bis[(o chlorobenzyl) diethylammonium] dichloride, a white crystalline powder, soluble in water to 20 percent (w/v). Inactive Ingredients: Acacia, Dibasic Calcium Phosphate, Gelatin, Lactose, Magnesium Stearate, Starch, Sucrose. CLINICAL PHARMACOLOGY The compound is a cholinesterase inhibitor with all the pharmacologic actions of acetylcholine, both the muscarinic and nicotinic types. Cholinesterase inactivates acetylcholine. Like neostigmine, MYTELASE suppresses cholinesterase but has the advantage of longer duration of action and fewer side effects on the gastrointestinal tract. The longer duration of action also results in more even strength, better endurance, and greater residual effect during the night and on awakening than is produced by shorter-acting anticholinesterase compounds. INDICATION AND USAGE This drug is indicated for the treatment of myasthenia gravis. CONTRAINDICATIONS Routine administration of atropine with MYTELASE is contraindicated since belladonna derivatives may suppress the parasympathomimetic (muscarinic) symptoms of excessive gastrointestinal stimulation, leaving only the more serious symptoms of fasciculation and paralysis of voluntary muscles as signs of overdosage. MYTELASE should not be administered to patients receiving mecamylamine, or any other ganglionic blocking agents. MYTELASE should also not be administered to patients with a known hypersensitivity to ambenonium chloride or any other ingredients of MYTELASE. WARNINGS Because this drug has a more prolonged action than other antimyasthenic drugs, simultaneous administration with other cholinergics is contraindicated except under strict medical supervision. The overlap in duration of action of several drugs complicates dosage schedules. -
Drugs Which Can Affect Near Vision: a Useful List
Drugs Which Can Affect Near Vision: A Useful List Joanne L. Smith B.Sc., Ph.Phm.* J. Raymond Buncic, M.D., F.R.C.S.(C)t ABSTRACT This paper documents a list of drugs that cause problems with near vision, by virtue of effects on accommodation, occasionally refractive error and diplopia. It is meant as a reference aid to the clinician when confronted with problems of focusing on near objects or print. There are many drugs that have been reported to interfere with near or reading vision, producing blurring, decreased accommodation and diplopia. This paper lists the drugs that have been reported in the literature to produce symptoms which interfere with near vision. Case reports for the listed drugs vary greatly from many to few. The drugs have been divided into the following categories: those causing (A) blurring at near, (B) diplopia and (C) induced myopia. Those drugs which only rarely cause these symptoms have been omitted. From the Departments of Pharmacy* and Ophthalmologyt, The Hospital For Sick Children, Toronto, Ontario, Canada Requests for reprints should be addressed to: Dr. J. Raymond Buncic, Department of Ophthalmology, The Hospital For Sick Children, 555 University Ave., Toronto, Ontario, Canada M5G lX8 TABLE 1 DRUGS COMMONLY CAUSING DIFFICULTY WITH FOCUSING AT NEAR OR BLURRED VISION. DRUG INCIDENCE REFERENCE Antipsychotics Chlorpromazine 14-23 8 Clozapine 5 8,14 Fluphenazine 1.2-4.3 8 Haloperidol 6.8-16 8 Loxapine 12,14 Perphenazine 7.4-17.8 8 Pimozide 20 8 Risperidone 1-2%, >/= 10% 11 Thioridazine 0.6-18 8 Thiothixene 20 8 -
PK of Medcm Against Nerve Agents, Which Have Been Integrated with PK and PD Data for the Nerve Agents Sarin and VX
UNIVERSITY OF SOUTHAMPTON FACULTY OF MEDICINE Institute of Developmental Sciences The Pharmacokinetics of Medical Countermeasures Against Nerve Agents by Stuart Jon Armstrong Thesis for the degree of Doctor of Philosophy November 2014 UNIVERSITY OF SOUTHAMPTON ABSTRACT FACULTY OF MEDICINE Institute of Developmental Sciences Thesis for the degree of Doctor of Philosophy THE PHARMACOKINETICS OF MEDICAL COUNTERMEASURES AGAINST NERVE AGENTS Stuart Jon Armstrong Nerve agents are organophosphorus compounds that irreversibly inhibit acetylcholinesterase, causing accumulation of the neurotransmitter acetylcholine and this excess leads to an overstimulation of acetylcholine receptors. Inhalation exposure to nerve agent can be lethal in minutes and conversely, skin exposure may be lethal over longer durations. Medical Countermeasures (MedCM) are fielded in response to the threat posed by nerve agents. MedCM with improved efficacy are being developed but the efficacy of these cannot be tested in humans, so their effectiveness is proven in animals. It is UK Government policy that all MedCM are licensed for human use. The aim of this study was to test the hypothesis that the efficacy of MedCM against nerve agent exposure by different routes could be better understood and rationalised through knowledge of the MedCM pharmacokinetics (PK). The PK of MedCM was determined in naïve and nerve agent poisoned guinea pigs. PK interactions between individual MedCM drugs when administered in combination were also investigated. In silico simulations to predict the concentration-time profiles of different administration regimens of the MedCM were completed using the PK parameters determined in vivo. These simulations were used to design subsequent in vivo PK studies and to explain or predict the efficacy or lack thereof for the MedCM.