Effects of Illicit Drugs on the Heart and Brain Presented By: Jeffrey Sather, MD, FACEP Trinity Health Disclosures

Total Page:16

File Type:pdf, Size:1020Kb

Effects of Illicit Drugs on the Heart and Brain Presented By: Jeffrey Sather, MD, FACEP Trinity Health Disclosures 2014 Stroke/Cardiac System of Care Conference Effects of Illicit Drugs on the Heart and Brain Presented by: Jeffrey Sather, MD, FACEP Trinity Health Disclosures No Financial incentives No off label use of any drug or medical device to be discussed Case Study 21 Year old male presents to critical access hospital agitated and confused Possibly ingested 2 grams of Methamphetamine Extremely agitated Ativan 2 mg IV Ativan 2 mg IV Haldol 5 mg IV Haldol 5 mg IV Ativan 2 mg IV Hypertensive Labetolol 5 mg IV Labetolol 5 mg IV Extremely agitated Seizing Temperature reaches 104 All of the above happening over 30 minutes. Then intubated to be transferred by fixed wing aircraft. Cardiac arrest Cardiac arrest while being loaded to airplane. Returned to CAH hospital for resuscitation About 10 minutes of CPR first arrest About 2 minutes of CPR second arrest Labs Labs Drugs of abuse screen Objectives What does a drug screen indicate? What are common drugs abused? What are the effects of drugs on the heart and brain? How does it effect treatment? North Dakota: Leader of the Pack North Dakota Ranks #1 in Binge Drinking Teen Alcohol Statistics 95% of the alcohol consumed by youth under the age of 21 in the U.S. is in the form of binge drinks. Binge drinking is associated with many health problems, including— Unintentional injuries (e.g., car crashes, falls, burns, drowning) Intentional injuries (e.g., firearm injuries, sexual assault, domestic violence) Alcohol poisoning Sexually transmitted diseases Unintended pregnancy Children born with Fetal Alcohol Spectrum Disorders High blood pressure, stroke, and other cardiovascular diseases Liver disease Neurological damage Sexual dysfunction, and Poor control of diabetes. Drug Use - Study In 2009, the safety agency issued the National Roadside Survey of Drug and Alcohol Use by Drivers: Alcohol was the most likely intoxicant 8.6 percent of the total tested had used marijuana 3.9 percent had used cocaine 1.3 percent tested positive for methamphetamine Drug Use Two studies (44,000 collisions): One out of four drivers involved in crashes had marijuana, cocaine, amphetamines, or some combination of those drugs in their system Approximately 14 percent of all drivers on the road have an illegal drug in their system Marijuana Marijuana Raises the heart rate 20-100% 4.8 fold increase in the risk of AMI in the first hour after smoking. This risk increases as other risk factors increase. Effects thinking and memory Stunts brain development Causes a decrease in IQ in subjects using through teens and twenties. Increased respiratory illness Marijuana Linked to increased mental illness such as: Depression Anxiety Suicide Psychosis Impairs judgment and contributes to increased risk of injury or death. Specific link to lung cancer not well established at this point Marijuana No Specific antidote Symptomatic Treatment Narcotics One of the oldest pharmacological substances Histamine releasing properties Produce bradycardia and hypotension by increasing parasympathetic and decreasing sympathetic response Strong respiratory depressant Can produce coma Infection from injection Narcotic Treatment Symptomatic treatment Antidote is Naloxone Half life can be shorter than the narcotic Cocaine Strong central nervous system stimulant that increases levels of dopamine Changes the short and long term reward system in the brain Cocaine Effects Constricts blood vessels Increases heart rate Increases blood pressure Increases body temperature Increased risk of AMI and Stroke Increased risk of sudden cardiac arrest. Cocaine Treatment No specific antidote Symptomatic Treatment Synthetic Drugs “Fake Substances . Real Dangers” K2, Spice, Bath Salts, Smiles . Synthetic Drugs What are they? Synthetic marijuana (often known as “K2” or “Spice”) and bath salts products are often sold in legal retail outlets as “herbal incense” and “plant food,” respectively, and labeled “not for human consumption” to mask their intended purpose and avoid FDA regulatory oversight of the manufacturing process. Synthetic Drugs How frequently is synthetic marijuana used? Use of synthetic marijuana is alarmingly high o 11.4 percent of 12th graders used Spice or K2 in the past year *second most commonly used illicit drug among seniors Synthetic Drugs What are they? Bath salts contain manmade chemicals related to amphetamines, also known as substituted cathinones. Cathinone derivatives are claimed to have effects similar to cocaine, amphetamine or MDMA (ecstasy). Smiles (not the good kind) “Designer Drug” – 2C- I The drug, a hallucinogen, has been linked to two deaths in Grand Forks, North Dakota. Though little is known about this drug's dangers. Smile’s effects: combination of MDMA (ecstasy) and LSD “speedy charge along with intense visual and auditory hallucinations” Synthetic Treatment No specific antidote Symptomatic Treatment Methamphetamine 2012 0.4% of population or 1.2 million report using 103,000 ED visits directly related in 2011 4th most commonly mentioned abused drug by ED patients nationally behind Marijuana, Cocaine, and Heroin Methamphetamine effects Increased attention and decreased fatigue Increased activity and wakefulness Decreased appetite Euphoria and rush Rapid/irregular heartbeat Vasoconstriction Hypertension Hyperthermia Methamphetamine chronic effects Anxiety Confusion Insomnia Mood disturbances Violent behavior Psychosis Hallucinations visual and auditory Paranoia Effects of Meth on the Brain Meth rewires the brain. Prolonged use not only modifies behavior, but literally changes the brain in fundamental and long-lasting ways. Even while recovery may be possible, the brain won’t be the same. Effects of Meth on the Brain PET Scan of a meth user and a control subject Face lift courtesy of meth 2 months later 1 year, 5 months later 2 years, 5 months later 1 year, 5 months later Effects of Meth Dental Decay Skin Lesions Psychosis Unnecessary Deaths . Teenage male collapses from unknown causes. Dies one day later. Dx: Sudden cardiac death secondary to “bad” meth. Unnecessary Deaths 17-year-old male and 23-year-old female with AMI. Both heavy meth users. 19-year-old presents with blood pressure of 290/160. Dies from a stroke after meth injection. Methamphetamine Treatment No specific antidote Symptomatic Treatment Drugs of Abuse Screen Screening test not a definitive test Must be metabolized and excreted to be present Metabolites present for variable periods Most 2-3 days Does not test for all abused substances For example fentanyl a synthetic opiate does not trigger positive for opiates. Pearls No specific antidote for most abused drugs except for Narcotics and Benzodiazepines. Pearls Flumazenil should not be given to benzodiazepine abusers and should only be used for iatrogenic overdose. Pearls Naloxone reverses narcotics Reversing narcotic overdose usually results in “bad behavior” Half life is shorter than many abused narcotics and repeated dosing may be needed. Pearls Gastric lavage has almost no utility Treatment is generally symptomatic Drug screen utility is to add evidence to clinical findings Case Study Case Study Arrives intubated with no neurologic response. In Rhabdomyolysis and has hyperkalemia. Case Study Case Study Case Study Hypothermia protocol for 24 hours Treated for Rhabdo and hyperklemia Rewarmed No neurologic recovery MRI shows diffuse edema and herniation Brain death testing protocol Support pulled and patient died Diagnosis: Death due to anoxic encephalopathy secondary to methamphetamine overdose.
Recommended publications
  • Scale-Free Dynamics of the Mouse Wakefulness and Sleep Electroencephalogram Quantified Using Wavelet-Leaders
    Article Scale-Free Dynamics of the Mouse Wakefulness and Sleep Electroencephalogram Quantified Using Wavelet-Leaders Jean-Marc Lina 1,2,3, Emma Kate O’Callaghan 1,4 and Valérie Mongrain 1,4,* 1 Research Centre and Center for Advanced Research in Sleep Medicine, Hôpital du Sacré-Coeur de Montréal (CIUSSS-NIM), 5400 Gouin West blvd., Montreal, QC H4J 1C5, Canada 2 Centre de Recherches Mathématiques, Université de Montréal, C.P. 6128, succ. Centre-Ville, Montreal, QC H3C 3J7, Canada; [email protected] 3 École de Technologie Supérieure, 1100 rue Notre-Dame Ouest, Montreal, QC H3C 1K3, Canada 4 Department of Neuroscience, Université de Montréal, C.P. 6128, succ. Centre-Ville, Montreal, QC H3C 3J7, Canada; [email protected] * Correspondence: [email protected]; Tel.: +1-514-338-2222 (ext. 3323) Received: 14 August 2018; Accepted: 11 October 2018; Published: 20 October 2018 Abstract: Scale-free analysis of brain activity reveals a complexity of synchronous neuronal firing which is different from that assessed using classic rhythmic quantifications such as spectral analysis of the electroencephalogram (EEG). In humans, scale-free activity of the EEG depends on the behavioral state and reflects cognitive processes. We aimed to verify if fractal patterns of the mouse EEG also show variations with behavioral states and topography, and to identify molecular determinants of brain scale-free activity using the ‘multifractal formalism’ (Wavelet-Leaders). We found that scale-free activity was more anti-persistent (i.e., more different between time scales) during wakefulness, less anti-persistent (i.e., less different between time scales) during non-rapid eye movement sleep, and generally intermediate during rapid eye movement sleep.
    [Show full text]
  • An Electrophysiological Marker of Arousal Level in Humans
    RESEARCH ARTICLE An electrophysiological marker of arousal level in humans Janna D Lendner1,2*, Randolph F Helfrich3,4, Bryce A Mander5, Luis Romundstad6, Jack J Lin7, Matthew P Walker1,8, Pal G Larsson9, Robert T Knight1,8 1Helen Wills Neuroscience Institute, University of California, Berkeley, Berkeley, United States; 2Department of Anesthesiology and Intensive Care Medicine, University Medical Center Tuebingen, Tuebingen, Germany; 3Hertie-Institute for Clinical Brain Research, Tuebingen, Germany; 4Department of Neurology and Epileptology, University Medical Center Tuebingen, Tuebingen, Germany; 5Department of Psychiatry and Human Behavior, University of California, Irvine, Irvine, United States; 6Department of Anesthesiology, University of Oslo Medical Center, Oslo, Norway; 7Department of Neurology, University of California, Irvine, Irvine, United States; 8Department of Psychology, University of California, Berkeley, Berkeley, United States; 9Department of Neurosurgery, University of Oslo Medical Center, Oslo, Norway Abstract Deep non-rapid eye movement sleep (NREM) and general anesthesia with propofol are prominent states of reduced arousal linked to the occurrence of synchronized oscillations in the electroencephalogram (EEG). Although rapid eye movement (REM) sleep is also associated with diminished arousal levels, it is characterized by a desynchronized, ‘wake-like’ EEG. This observation implies that reduced arousal states are not necessarily only defined by synchronous oscillatory activity. Using intracranial and surface EEG recordings in four independent data sets, we demonstrate that the 1/f spectral slope of the electrophysiological power spectrum, which reflects the non-oscillatory, scale-free component of neural activity, delineates wakefulness from propofol *For correspondence: anesthesia, NREM and REM sleep. Critically, the spectral slope discriminates wakefulness from [email protected] REM sleep solely based on the neurophysiological brain state.
    [Show full text]
  • Deconstructing Arousal Into Wakeful, Autonomic and Affective Varieties
    Neuroscience Letters xxx (xxxx) xxx–xxx Contents lists available at ScienceDirect Neuroscience Letters journal homepage: www.elsevier.com/locate/neulet Review article Deconstructing arousal into wakeful, autonomic and affective varieties ⁎ Ajay B. Satputea,b, , Philip A. Kragelc,d, Lisa Feldman Barrettb,e,f,g, Tor D. Wagerc,d, ⁎⁎ Marta Bianciardie,f, a Departments of Psychology and Neuroscience, Pomona College, Claremont, CA, USA b Department of Psychology, Northeastern University, Boston, MA, USA c Department of Psychology and Neuroscience, University of Colorado Boulder, Boulder, USA d The Institute of Cognitive Science, University of Colorado Boulder, Boulder, USA e Athinoula A. Martinos Center for Biomedical Imaging, Massachusetts General Hospital, Boston, MA, USA f Department of Radiology, Harvard Medical School, Boston, MA, USA g Department of Psychiatry, Massachusetts General Hospital, Boston, MA, USA ARTICLE INFO ABSTRACT Keywords: Arousal plays a central role in a wide variety of phenomena, including wakefulness, autonomic function, affect Brainstem and emotion. Despite its importance, it remains unclear as to how the neural mechanisms for arousal are or- Arousal ganized across them. In this article, we review neuroscience findings for three of the most common origins of Sleep arousal: wakeful arousal, autonomic arousal, and affective arousal. Our review makes two overarching points. Autonomic First, research conducted primarily in non-human animals underscores the importance of several subcortical Affect nuclei that contribute to various sources of arousal, motivating the need for an integrative framework. Thus, we Wakefulness outline an integrative neural reference space as a key first step in developing a more systematic understanding of central nervous system contributions to arousal.
    [Show full text]
  • MWT Review Paper.Qxp 12/30/2004 8:46 AM Page 123
    MWT review paper.qxp 12/30/2004 8:46 AM Page 123 REVIEW PAPER The Clinical Use of the MSLT and MWT Donna Arand, Ph.D1, Michael Bonnet, Ph.D2, Thomas Hurwitz, M.D3, Merrill Mitler, Ph.D4, Roger Rosa, Ph.D5 and R. Bart Sangal, M.D6 1 Kettering Medical Center, Dayton, OH, 2Dayton Veteran’s Affairs Medical Center and Wright State University, Dayton, OH, 3Minneapolis Veteran’s Affairs Medical Center and University of Minnesota, Minneapolis, MN, 4National Institute of Neurological Disorders & Stroke Neuroscience Center, Bethesda, MD, 5National Institute for Occupational Safety and Health, Washington, DC, 6Sleep Disorders Institute, Troy, MI Citation: Review by the MSLT and MWT Task Force of the Standards of Practice Committee of the American Academy of Sleep Medicine. SLEEP 2005;28(1):123-144. 1.0 INTRODUCTION ness and to assess the database of evidence for the clinical use of the MSLT and MWT. EXCESSIVE SLEEPINESS IS DEFINED AS SLEEPINESS OCCURRING IN A SITUATION WHEN AN INDIVIDUAL 2.0 BACKGROUND WOULD BE EXPECTED TO BE AWAKE AND ALERT. It is a chronic problem for about 5% of the general population,1, 2 and it 2.1 History of the Development of MSLT and MWT is the most common complaint evaluated by sleep disorder cen- Initially, definitions involving sleep onset were based on ters.1, 3 The most common causes of sleepiness include partial sleep deprivation, fragmented sleep and medication effects. behavioral observations that often depended on features such as Sleepiness is also associated with sleep disorders such as sleep lack of movement, unresponsiveness, snoring, etc.
    [Show full text]
  • Pharmacological Management of Disrupted Sleep Due to Methamphetamine Use: a Literature Review
    Journal of Psychology and Clinical Psychiatry Literature Review Open Access Pharmacological management of disrupted sleep due to Methamphetamine use: a literature review Abstract Volume 11 Issue 5 - 2020 Objective: To review the literature on pharmacological management of disrupted sleeping Jagdeep Kaur,1 Kawish Garg2 patterns due to Methamphetamine use. 1Clinical Director of MAT Services, Keystone Behavioral Health Data sources: A PubMed search of human studies published in English through July 2020 Services, USA 2 was conducted using the broad search terms “Methamphetamine” and “Sleep”. Medical Director of Sleep Medicine, Geisinger Holy Spirit, USA Study selection: 105 articles were identified and reviewed; 2 studies met the inclusion Correspondence: Kawish Garg, Medical Director of Sleep criteria. Medicine, Geisinger Holy Spirit, 550 North 12th St Lemoyne, PA 17043, USA, Tel 717-975-8585, Email Data extraction: Study design, sample size, medications dose and duration, and sleep related outcomes were reviewed. Received: September 10, 2020 | Published: September 23, 2020 Data synthesis: This is some evidence for Modafinil and Mirtazapine for disrupted sleep due to Methamphetamine use, however it is limited by small sample size of the studies. Conclusion: Treatment of disrupted sleep due to Methamphetamine use, remains challenging. Modafinil and mirtazapine appear to show promise, but further research is warranted before making any evidence-based recommendations. Keywords: methamphetamine, sleep Abbreviations: NSDUH, national survey on
    [Show full text]
  • Potential Brain Neuronal Targets for Amphetamine-, Methylphenidate
    Proc. Natl. Acad. Sci. USA Vol. 93, pp. 14128–14133, November 1996 Neurobiology Potential brain neuronal targets for amphetamine-, methylphenidate-, and modafinil-induced wakefulness, evidenced by c-fos immunocytochemistry in the cat (immediate-early geneyprotooncogeneyanterior hypothalamic nucleusystriatumydopaminergic system) JIANG-SHENG LIN*, YIPING HOU, AND MICHEL JOUVET De´partementde Me´decineExpe´rimentale, Institut National de la Sante´et de la Recherche Me´dicaleUnite´52, Centre National de la Recherche Scientifique ERS 5645, Faculte´deMe´decine, Universite´Claude Bernard, 8 avenue Rockefeller, 69373 Lyon, France Communicated by Jean-Pierre Changeux, Institut Pasteur, Paris, France, August 29, 1996 (received for review July 29, 1996) ABSTRACT Much experimental and clinical data suggest expression of IEGs occurs in the brain, c-fos is strongly expressed that the pharmacological profile of modafinil, a newly dis- in various specific cerebral areas following different stimuli, such covered waking substance, differs from those of amphetamine as electrical or pharmacological stimulation, stress, or sleep and methylphenidate, two classical psychostimulants. The deprivation (8–15). Thus, visualization of c-fos could serve as a brain targets on which modafinil acts to induce wakefulness, sensitive indicator of gene activation in individual target neurons however, remain unknown. A double-blind study using the activated following a given stimulus. protooncogene c-fos as experimental marker in the cat was, We have, therefore, developed Fos immunocytochemical pro- therefore, carried out to identify the potential target neurons cedures in both the rat and cat to visualize the potential targets of modafinil and compare them with those for amphetamine of modafinil and amphetamine in the central nervous system.
    [Show full text]
  • Suprachiasmatic Modulation of Noradrenaline Release in the Ventrolateral Preoptic Nucleus
    6412 • The Journal of Neuroscience, June 13, 2007 • 27(24):6412–6416 Brief Communications Suprachiasmatic Modulation of Noradrenaline Release in the Ventrolateral Preoptic Nucleus Benoıˆt Saint-Mleux,1 Laurence Bayer,1 Emmanuel Eggermann,1 Barbara E. Jones,2 Michel Mu¨hlethaler,1 and Mauro Serafin1 1De´partement de Neurosciences Fondamentales, Centre Me´dical Universitaire, 1211 Gene`ve 4, Switzerland, and 2Department of Neurology and Neurosurgery, McGill University, Montreal Neurological Institute, Montreal, Quebec, Canada H3A 2B4 As the major brain circadian pacemaker, the suprachiasmatic nucleus (SCN) is known to influence the timing of sleep and waking. We thus investigated here the effect of SCN stimulation on neurons of the ventrolateral preoptic nucleus (VLPO) thought to be involved in promoting sleep. Using an acute in vitro preparation of the rat anterior hypothalamus/preoptic area, we found that whereas single-pulse stimulations of the SCN evoked standard fast ionotropic IPSPs and EPSPs, train stimulations unexpectedly evoked a long-lasting inhi- bition (LLI). Such LLIs could also be evoked in VLPO neurons by pressure application of NMDA within the SCN, indicating the specific activation of SCN neurons. This LLI was shown to result from the presynaptic facilitation of noradrenaline release, because it was ␣ suppressed in presence of yohimbine, a selective antagonist of 2-adrenoreceptors. The LLI depended on the opening of a potassium conductance, because it was annulled at EK and could be reversed below EK. These results show that the SCN can provide an LLI of the sleep-promoting VLPO neurons that could play a role in the circadian organization of the sleep–waking cycle.
    [Show full text]
  • Reticular Formation and Sleep/Wakefulness
    Reticular Formation and Sleep/Wakefulness Maureen Riedl Department of Neuroscience University of Minnesota 1 Reticular Formation • The reticular formation is the oldest part of our nervous system phylogenetically. • It is present throughout the midbrain, pons and medulla. • Typically, the reticular formation is regions of the brainstem between clearly defined nuclei and tracts • It is groups of neurons embedded in a seeming disorganized mesh of axons and dendrites. 2 Reticular Formation • Although seemingly disorganized, over 100 groups of neurons related by function and connections have been identified in the reticular formation. 3 Reticular Formation Locus Coeruleus Cortex Spinal Cord Amygdala Superior Colliculus Reticular Formation Motor Nuclei Cerebellum Hippocampus Hypothalamus Periaqueductal Gray Thalamus 4 Reticular Formation • The reticular formation receives input from all parts of the nervous system… every sensory system, all parts of the motor system, thalamus, hypothalamus, cortex, etc. • The output of the reticular formation is as diverse as its input. • Many of the neurons in the reticular formation have large, highly branched dendrites that receive diverse information. 5 Reticular Formation • The reticular formation has a major role in regulation of: • Motor control • Sensory attention • Autonomic nervous system • Eye movements • Sleep and wakefulness 6 Reticulospinal & Reticulbulbar Projections • Reticular formation (RF) in the lower pons and medulla receives motor information from premotor cortex, motor cortex and cerebellum as well as proprioceptive and vestibular sensory information. • RF sends axons to cranial nerve motor nuclei and to ventral horn of the spinal cord via the reticulospinal tracts. 7 Reticulospinal & Reticulbulbar Projections • Reticular formation (RF) initiates ‘accompanying’ movements. • Accompanying movements are subconscious and are needed in support of a consciously initiated movement.
    [Show full text]
  • Recreational Drugs and Sleep an Overview
    Recreational Drugs and Sleep An overview Dr Claire Durant Imperial College London, UK Recreational Drugs • Not all are illegal; (eg caffeine and alcohol legal) • Chemical substances taken to improve life in some way • Used commonly to reduce stress/ promote wake • Used parties/night clubs to improve sociability, • ……and to increase (perceived) dancing ability • Can also used to self medicate • All affect the neurotransmitters involved in sleep and wake • Sleep can be affected differently depending on: • Dose and timing of administration • Occasional vs chronic use (dependence)- withdrawal of almost all leads to sleep disturbance1 • 2Commonly used drugs in Europe: • Cannabis, Cocaine, Ecstasy (MDMA), Opioids (Heroin) 1Angarita et al. Addict Sci Clin Pract. 2016 Apr 26;11(1):9. 2European Drug Report 2015: Trends and Developments. European Monitoring Centre for Drugs and Drug Addiction (EMCDDA), (http://www.emcdda.europa.eu) Neurotransmitters in sleep & wake Sleep and waking influenced by a wide range of neurotransmitters - drugs that affect these will potentially alter sleep. Increasing Increasing Examples of Examples of Endogenous function function drugs promoting drugs promoting transmitter maintains promotes wakefulness sleep wakefulness sleep GABA Benzodiazepines Most recreational (Alcohol) Z drugs (Alcohol) drugs have actions at multiple receptors. Melatonin Melatonin Adenosine Antagonist: Caffeine Street preparations/ those purchased on the Noradrenaline Amphetamines (Cocaine/MDMA) internet …might not be what Serotonin SSRIs Mirtazapine,
    [Show full text]
  • Optogenetic-Mediated Release of Histamine Reveals Distal and Autoregulatory Mechanisms for Controlling Arousal
    The Journal of Neuroscience, April 23, 2014 • 34(17):6023–6029 • 6023 Brief Communications Optogenetic-Mediated Release of Histamine Reveals Distal and Autoregulatory Mechanisms for Controlling Arousal Rhîannan H. Williams,1* Melissa J.S. Chee,2* Daniel Kroeger,1 Loris L. Ferrari,1 Eleftheria Maratos-Flier,2 Thomas E. Scammell,1 and Elda Arrigoni1 1Department of Neurology and 2Division of Endocrinology, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, Massachusetts 02215 Histaminergic neurons in the tuberomammillary nucleus (TMN) are an important component of the ascending arousal system and may form part of a “flip–flop switch” hypothesized to regulate sleep and wakefulness. Anatomical studies have shown that the wake-active TMN and sleep-active ventrolateral preoptic nucleus (VLPO) are reciprocally connected, suggesting that each region can inhibit its counterpart when active. In this study, we determined how histamine affects the two branches of this circuit. We selectively expressed channelrhodopsin-2 (ChR2) in TMN neurons and used patch-clamp recordings in mouse brain slices to examine the effects of photo- evoked histamine release in the ventrolateral TMN and VLPO. Photostimulation decreased inhibitory GABAergic inputs to the ventro- lateral TMN neurons but produced a membrane hyperpolarization and increased inhibitory synaptic input to the VLPO neurons. We found that in VLPO the response to histamine was indirect, most likely via a GABAergic interneuron. Our experiments demonstrate that release of histamine from TMN neurons can disinhibit the TMN and suppresses the activity of sleep-active VLPO neurons to promote TMNneuronalfiring.Thisfurthersupportsthesleep–wake“flip–flopswitch”hypothesisandaroleforhistamineinstabilizingtheswitch to favor wake states. Key words: electrophysiology; histamine; mouse; optogenetics; TMN; VLPO Introduction TMN neurons project widely throughout the CNS, notably Histamine plays a critical role in arousal and in maintaining vig- innervating wake-promoting brain regions (Panula et al., 1989), ilance.
    [Show full text]
  • Stimulant ADHD Medications: Methylphenidate and Amphetamines
    Stimulant ADHD Medications: Methylphenidate and Amphetamines Stimulant medications including How Are Prescription Stimulants amphetamines (e.g., Adderall) and Used? methylphenidate (e.g., Ritalin and Concerta) are often prescribed to treat Prescription stimulants have a calming children, adolescents, or adults diagnosed and “focusing” effect on individuals with attention-deficit hyperactivity with ADHD. They are prescribed to disorder (ADHD). patients for daily use, and come in the form of tablets or capsules of varying People with ADHD persistently have more dosages. Treatment of ADHD with difficulty paying attention or are more stimulants, often in conjunction with hyperactive or impulsive than other psychotherapy, helps to improve ADHD people the same age. This pattern of symptoms along with the patient’s self- behavior usually becomes evident when a esteem, thinking ability, and social and child is in preschool or the first grades of family interactions. elementary school; the average age of onset of ADHD symptoms is 7 years. Many people’s ADHD symptoms improve during Prescription stimulants are sometimes adolescence or as they grow older, but the abused however—that is, taken in disorder can persist into adulthood. higher quantities or in a different manner than prescribed, or taken by ADHD diagnoses are increasing. those without a prescription. Because According to the U.S. Centers for Disease they suppress appetite, increase Control and Prevention, as of 2011, 11 wakefulness, and increase focus and percent of people ages 4–17 have been attention, they are frequently abused diagnosed with ADHD. for purposes of weight loss or performance enhancement (e.g., to help study or boost grades in school; see box).
    [Show full text]
  • Neurobiology of Sleep (Review)
    EXPERIMENTAL AND THERAPEUTIC MEDICINE 21: 272, 2021 Neurobiology of sleep (Review) CRISTIAN FALUP‑PECURARIU1,2*, ȘTEFANIA DIACONU1,2*, DIANA ȚÎNȚ1,3 and OANA FALUP‑PECURARIU1 1 Department of Neurology, Faculty of Medicine, Transilvania University of Brașov, 500036 Brașov; 2Department of Neurology, County Emergency Clinic Hospital, 500365 Brașov; 3Clinicco Hospital, 500059 Brașov, Romania Received October 12, 2020; Accepted November 10, 2020 DOI: 10.3892/etm.2021.9703 Abstract. Sleep is a physiological global state composed of 5. Circadian and homeostatic control of sleep two different phases: Non‑rapid eye movement (NREM) and 6. Conclusions rapid eye movement (REM) sleep. The control mechanisms of sleep manifest at the level of genetic, biological and cellular organization. Several brain areas, including the basal fore‑ 1. Introduction brain, thalamus, and hypothalamus, take part in regulating the activity of this status of life. The signals between different Sleep is a reversible physiological state which involves a brain regions and those from cortical areas to periphery specific pattern of cerebral electric activity. There are two are conducted through various neuromediators, which are main alternating phases that compose normal sleep: Non‑rapid known to either promote wakefulness or sleep. Among others, eye movement (NREM) sleep and rapid‑eye movement (REM) serotonin, norepinephrine, histamine, hypocretin (orexin), sleep. This article will review the main brain regions and acetylcholine, dopamine, glutamate, and gamma‑aminobutyric neuromediators taking part in the regulation of sleep. acid are known to orchestrate the intrinsic mechanisms of sleep neurobiology. Several models that explain the transition 2. Anatomical regions involved in controlling sleep‑wake and the continuity between wakefulness, NREM sleep and states REM sleep have been proposed.
    [Show full text]