substance-related disorders marcelino v. ostrea jr.,m.d
TRANSCRIPT
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SUBSTANCE-RELATED DISORDERS
Marcelino V. Ostrea Jr.,M.D.
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Historical BackgroundHistorical Background
Substance abuse Major public health problem throughout the
world.
Dangerous Drugs Board and the Antinarcotics Group of the Philippine National Police Estimated that 1.8 million of the 80 million Filipinos were regular drug users while 1.6 million others are casual users.
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Historical BackgroundHistorical Background
International Narcotics Control BoardMethamphetamine Hydrochloride or Shabu
MOST POPULAR DRUG OF ABUSE IN THE
PHILIPPINES. 1.8 million drug users nationwide, 1.2 million young generation (15 to 29yrs.)More in MALES at 12 to 1 ratio. Often SINGLE, EMPLOYED or SELF EMPLOYED. 6 to 12 years of education, from urban area.
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Historical BackgroundHistorical Background
………Although the sequelae of addiction, such as cirrhosis, psychopathology, trauma, and infection, generally receive proper medical attention, patients’ primary addictive problems often go untreated.
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Drug AddictionDrug Addiction
WHY DO PEOPLE ABUSE DRUGS?1. GENETICS2. PERSONALITY PROFILE3. ENVIRONMENT4. NEUROBIOLOGY5. OTHER FACTORS
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Drug AddictionDrug AddictionGenetics
◦Genes that influence initiation of drug use are RELATED to ANTISOCIAL PERSONALITY TRAITS
◦Genetic factors for initiation of use are largely the SAME for all class of drugs except opiates.
Tsuang et al. 1999
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Drug AddictionDrug Addiction
Genetics Strongest genetic influences on the
risk of drug abuse are the SAME genes that influence initiation of drug use.
Once drug use is initiated, the factors that influence the transition from initiation to repeated use, abuse, or dependence are largely NON GENETIC unique to each individual.
(Kendler et al.1999,2000; Sigvardsson et al, 1996; Tsuang et al. 1999).
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Personality ProfilePersonality Profile
Personality Antecedent ◦ANTISOCIAL PERSONALITY traits in a
person’s biological parents predict an increased risk of early-onset alcohol and substance abuse.
◦ANTISOCIAL PERSONALITY traits in a person’s own childhood and adolescence predict early onset of substance abuse.
Cadoret et al. 1995
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Personality ProfilePersonality Profile
Personality Antecedent ◦High novelty seeking◦Low self-directedness◦Low cooperativeness◦Personality disorders characterized by
an inability to delay gratification◦Carry high risk of co-morbid substance
abuse leading to both early initiation of drug experimentation and frequent transition to substance abuse or dependence.
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Neurobiology of Substance Neurobiology of Substance AbuseAbuse
PSYCHOPHARMACOLOGY OF REWARD AND DRUGS OF ABUSE
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THEORETICAL ASPECTS OF THEORETICAL ASPECTS OF ADDICTIONADDICTION
POSITIVE REINFORCEMENT ◦Something special in the drug that
elevates the mood above the ordinary.◦The drug is viewed something that
satisfies the individual like sexual gratification, is simply a source of enjoyment.
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SUBSTRATES OF POSITIVE SUBSTRATES OF POSITIVE RE-INFORCEMENTRE-INFORCEMENT
The most clearly identified elements of brain reward circuitry are the Mesolimbic Dopamine System (“Pleasure Center”) and its primary target neurons in are; 1. VTA
2. NAC
3. VENTRAL PALLIDUM
4. MEDIAL PREFRONTAL CORTEX.Dopamine as the “pleasure neurotransmitter”.
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Dopaminergic Dopaminergic Pathway:Pathway:
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Dopamine Hypothesis Dopamine Hypothesis of Psychosisof Psychosis
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Dopamine Hypothesis of Dopamine Hypothesis of PsychosisPsychosis
Hyperdopaminergic activity of the mesolimbic pathway induces positive symptoms of psychosis.◦hostility - excitement◦delusions - suspiciousness◦hallucinations - conceptual
disorganization◦grandiosity
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SUBSTRATES OF POSITIVE SUBSTRATES OF POSITIVE
RE-INFORCEMENTRE-INFORCEMENTFactors that trigger mesolimbic
dopamine neurons to release dopamine. “Natural Highs” “Drug-induced high”
Endorphins morphine/heroin Anandamide marijuana Acetylcholine nicotine Dopamine cocaine & amphetamine
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Mesolimbic Dopamine Mesolimbic Dopamine Pathway Pathway Psychopharmacology of Psychopharmacology of RewardReward
Mesolimbic Pathway
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Drugs affecting the Drugs affecting the mesolimbic dopaminergic mesolimbic dopaminergic neurons.neurons.
Amphetamine
Cocaine
Cannabis
Dopamine
GABA
Alcohol
Opiod
Nicotine
Acetylcholine
Hallucinogens
PCP
Glutamate
Serotonin
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Stimulants:Stimulants: Rewarding effects of stimulants are medicated
through the mesolimbic dopamine system.◦ DA neurons (ventral tegmental area) projections to
NAc, v. pallidum and medial prefrontal cortex.Reinforcing properties of cocaine and
amphetamine are associated with their increase synaptic DA levels
◦ Cocaine increases synaptic DA by binding to DAT & inhibiting activity.
◦ Amphetamine increases synaptic DA by actions on vesicular monoamine transporter causes release of DA.
Johanson & Fischman 1989; Kosten 2002
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Pharmacology of CocainePharmacology of Cocaine
Dopamine
Cocaine
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Pharmacology of CocainePharmacology of Cocaine
Dopamine
Repeat cocaine use can lead to REVERSE TOLERANCE such asACUTE PARANOID PSYCHOSIS.
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Pharmacology of Pharmacology of AmphetamineAmphetamine
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Stimulants:Stimulants:
Cocaine & Aamphetamine also have actions on NE and 5-HT neurons, and all of these neurotransmitters are important targets for medication development.
Rothman et al. 2000
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Stimulants:Stimulants: Neurobiological effects of CHRONIC STIMULANT ABUSE:◦Decreased postsynaptic DA receptors
◦Reduced DA function◦Reduced CBF & cortical perfusion◦Alterations in glucose metabolism
◦ Increased GM in early withdrawal◦ Decreased GM in late withdrawal.
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Stimulants:Stimulants:
Neurobiological effects of chronic stimulant abuse:◦Impairments in verbal learning,
memory, and attention.◦Neuropsychological deficits was due
to reduction in cerebral blood flow.◦DAT reduction is also assoc. with
psychomotor impairment in methamphetamine abusers.
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Signs and symptoms of Signs and symptoms of stimulant intoxication:stimulant intoxication: Behavioral and Psychological
Abnormalities:◦Euphoria or blunted affect◦Hypervigilance◦Interpersonal sensitivity◦Anxiety, tension, and anger◦Stereotyped behaviors◦Impaired judgement◦Bruxism - Grinding together of the teeth
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Signs and symptoms of Signs and symptoms of stimulant intoxication:stimulant intoxication: Physical manifestations:
◦Tachycardia or bradycardia◦Dilated pupils◦Elevated or low blood pressure◦Sweating or chills◦Nausea or vomiting◦Evidence of weight loss◦Psychomotor agitation or retardation◦Muscle weakness, respiratory depression,
chest pain, cardiac arrhythmia◦Confusion, seizures, dyskinesias,
dystonias, coma
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Treatment of stimulant Treatment of stimulant intoxication:intoxication: Acute Episodes:
Medical & Psychiatric stabilizationDelirium of seizure controlRespiratory support & control of blood pressure,
temperature, arrhythmias Control of agitation, aggressiveness, & paranoid
psychosis
Acute Cocaine toxicity typically subsides within 1 - 2 hours.
Acute Amphetamine toxicity may persist for several hours.
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Indications for Indications for Pharmacotherapy:Pharmacotherapy: Treatment of Comorbid Primary Psychiatric Disorders:Major depressive disorderBipolar disorderSchizophrenia
Treatment of Comorbid Substance Use DisorderAlcohol dependence (disulfiram or naltrexone)Opioid dependence (methadone)
Treatment of Stimulant-Induced Mental Disorder (if severe & persistent)Cocaine / Amphetamine withdrawal (desipramine)Cocaine induced Psychotic disorder (neuroleptics)Cocaine induced Mood disorder (Tricyclic or SSRI)
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Treatment of stimulant Treatment of stimulant intoxication:intoxication:
Psychotherapy1. Motivation for abstinence2. Development of a rewarding, drug-
free lifestyle3. Avoidance of relapse
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MarijuanaMarijuanaCannabis Sativa (Marijuana)
◦Smoked to deliver psychoactive substances, cannabinoids
◦Especially THC DELTA-9-TETRAHYDROCANNABINOL
◦THC interact with brain’s own cannabinoid receptor (CB1) to trigger DOPAMINE RELEASE from mesolimbic reward system.
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MarijuanaMarijuanaCannabis Sativa (Marijuana)
◦effect in the body is centered mainly in the CENTRAL NERVOUS SYSTEM;
1. Increased sense of well-being & euphoria;2. Impaired short term memory;3. deterioration in the capacity to carry out
tasks that require multiple mental steps to reach a specific goal “temporal disintegration”
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MarijuanaMarijuanaCB1 Receptor Distribution in the Brain.
◦BASAL GANGLIA – highest distribution.◦Molecular layer of the cerebellum.◦Pyramidal layers of the
◦ Hippocampus◦ Dentate gyrus,◦ Layers I & VI of cortex
◦NAc & Ventromedial striatum◦Brain stem areas – lowest level
No evidence of CB2 receptor presence in the neural membrane.
Herkenham et al. 1990
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MarijuanaMarijuana
Functional significance of the endogenous cannabinoid system.◦Pain perception
CB1 & CB2 receptors are both involved in perception of peripheral pain.
CB1 involved in the control of inflammatory pain.
Potentiate morphine anesthesia Centrally acting analgesics
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MarijuanaMarijuana
Functional significance of the endogenous cannabinoid system◦Appetite and reward
endogenous cannabinoid system controls hormonal appetite
Play a role in control of hypothalamic function.
Di Marzo et al. 2001
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MarijuanaMarijuanaFunctional significance of
endogenous cannabinoid system.◦Immune Modulation
Endogenous cannabinoids and THC have been shown to be anti-inflammatory effect, possibly through the inhibition of the production and action of tumor necrosis factor alpha and other acute-phase cytokines
CB2 receptors involvement in the immune system.
Klein et al. 2000
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MarijuanaMarijuanaCannabis and Neuroimaging.
◦Those who started using marijuana before age 17, had a smaller brain
◦Smaller % of cortical gray matter◦Larger % of white matter volume◦Males who started using marijuana before age 17 had significantly higher CBF
◦Male & females who started younger were physically smaller in terms of weight & height, especially males
◦ Wilson et al. 2000
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Marijuana DependentMarijuana DependentTreatment Approach
Specialized therapeutic support Brief individual & extended group
interventionProvide continued access to
aftercare support to prevent relapsed
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AlcoholAlcohol (C2H6O).(C2H6O).
Ethanol or beverage alcohol – organic molecule
Carries little chemical information in its structure but generates myriads effects in CNS & PNS
Alcohol dependence◦“pharmacogenetic disease” in which
“disease” causing agent (alcohol) interacts with genetic background of the “host” (human) to produce the manifestations of the “disease”.
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AlcoholAlcoholFactors that influence Alcohol
Dependence:1. GENETIC2. ENVIRONMENT
◦ ….as the concentration of ethanol in the brain is increased, the action of ethanol spread from a limited number of targets to involve multiple molecular site of action.
◦ differentiate ethanol from other drugs (morphine) that are limited in their spectrum of action by specific receptor interactions.
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AlcoholAlcoholMolecular interactions that mediate
effects of ethanol◦Before - disordering of neuronal
membrane bulk lipids. ◦Current knowledge – ethanol’s biophysical
(amphipathic) properties may well affect protein-lipid and protein-protein interactions or disruption of scaffold systems devoted to bringing together protein complexes.
Pawson & Scott 1997
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AlcoholAlcohol
Molecular interactions that mediate effects of ethanol.
1. GABAA Receptor System2. NMDA Receptor System3. Serotonin Receptors4. Nicotinic Cholinergic Receptors Role of Receptor-Gated Ion
Channels & Certain G Protein-Coupled Receptors in Reinforcing Properties of Ethanol
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AlcoholAlcohol
GABA Receptor System◦Ethanol increase the action of the inhibitory neurotransmitter GABA at the GABAA receptor
1.SEDATIVE2.ANTICONVULSANT3.ANXIOLYTIC4.INCOORDINATING effects of
ethanolWhiting et al. 1999
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AlcoholAlcohol
N-methyl-D-aspartate (NMDA) Receptor System◦Ethanol is a potent inhibitor of NMDA receptor function.
◦Sedative, anticonvulsant, anxiolytic, and incoordinating effects of ethanol
◦Explained by ethanol’s inhibition of the NMDA receptor system and by potentiation of activation of the GABAA receptor.
Whiting et al. 1999
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AlcoholAlcohol
Serotonin Receptors & Nicotinic Cholinergic Receptor System◦Conc. of ethanol that produce moderate intoxication (25 mM) potentiate effects of serotonin (5-HT) at 5-HT3 subtype of 5-HT receptor.
◦Possible role of this receptor in the reinforcing and/or intoxicating effect of ethanol
Sung et al. 2000
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AlcoholAlcoholNeuroadaptations leading to
craving for alcohol.◦NMDA receptors may exert a tonic INHIBITORY CONTROL OVER FIRING OF MESOLIMBIC DOPAMINERGIC neuron resulting in decreased dopamine release which is observed after alcohol withdrawal.
Rossetti et al.1991
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AlcoholAlcohol
Neuroadaptations leading to craving for alcohol.◦Withdrawal from ethanol also
generates a DECREASE in the firing of DOPAMINERGIC neurons in the VENTRAL TEGMENTAL area of the brain stem and a decrease in the release of dopamine from these neurons.
Bailey et al. 1998; Rossetti et al. 1991
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AlcoholAlcohol
Neuroadaptations leading to craving for alcohol.◦Ethanol withdrawal was reported to
be associated with decreased activity of 5-HT neurons and 5-HT release in the NAc and may contribute to SLEEP DISTURBANCE & DEPRESSION.
Weiss et al. 2001
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Alcohol Withdrawal Alcohol Withdrawal Early-onset withdrawal – starts within
24 hrs, often within 6 to 8 hrs after blood alcohol level fall.
Characterized by:◦Autonomic hyperactivity (tacchycardia,
hypertension, diaphoresis, tremor, fever)◦Sleep disturbance◦GIT manifestation (anorexia, nausea &
vomiting)◦Psychological manifestations (poor
conc. Impaired memory, hallucinations, agitation, anxiety)
◦Neurological signs ( seizures)
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Alcohol Withdrawal Alcohol Withdrawal Late-onset withdrawal – occurs more than
24 hrs, after the last drink and assoc. with more serious symptoms
Seizure usually occur within 24 hrs of the withdrawal syndrome and are not part of Delirium Tremen nor are they considered epilepsy. Typically GENERALIZED AND TONIC-CLONIC. Don’t require long term prophylactic anticonvulsant treatment.
No Prophylactis TXIf seizure occurs later than 24 hours.
Investigate other cause ex. Subdural hematoma
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Delirium TremensDelirium TremensDevelops within 24 to 72 hrs. after the
onset of abstinence (usually not later than 7 days).
Manifestations:1. High fever2. Marked confusion (delirium)3. Severe autonomic hyperactivity4. Anxiety5. Agitation & Mental fluctuation
Syndrome usually DISAPPEARS BY 3 TO 5 DAYS.
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Treatment of Delirium Treatment of Delirium TremensTremens
1. Intravenous fluid replacement2. Parenteral thiamine 100mg/day3. Treat hyperthermia4. Sedate with IM or IV diazepam5. Control seizure
(benzodiazepines or phenytoin)6. Treat psychosis with neuroleptic
(haloperidol).7. Physical restraint if necessary.
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ECTASY ECTASY
Methyl-1-(3,4-methylenedioxyphenyl)-2aminobutane (MDMA).
Known as Adam, XTC, and XSynthetic amphetamine analogue with stimulant properties.
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Methyl-1-(3,4-Methyl-1-(3,4-methylenedioxyphenyl)-methylenedioxyphenyl)-2aminobutane (MDMA)2aminobutane (MDMA)MDMA
◦Principal desired effect is profound feeling of relatedness to the rest of the world.
◦Most user experience this feeling as a powerful connection to those around them.
◦Alters perception of time and decreased inclination to perform mental and physical tasks.
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Methyl-1-(3,4-Methyl-1-(3,4-methylenedioxyphenyl)-methylenedioxyphenyl)-2aminobutane (MDMA)2aminobutane (MDMA)MDMA
◦ Although the desire for sex can increase, the ability to achieve arousal and orgasm is greatly diminished in both men and women.
◦ Common aftereffects is similar the amphetamine withdrawal.
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Methyl-1-(3,4-Methyl-1-(3,4-methylenedioxyphenyl)-methylenedioxyphenyl)-2aminobutane (MDMA)2aminobutane (MDMA)
Severe immediate effects:◦ Altered mental status◦ Convulsions,◦ Hypo-hyperthermia,◦ Severe changes in blood pressure◦ Tachycardia◦ Coagulopathy◦ Acute renal failure◦ Hepatotoxicity◦ Rhabdomyolysis◦ Death
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Methyl-1-(3,4-Methyl-1-(3,4-methylenedioxyphenyl)-methylenedioxyphenyl)-2aminobutane (MDMA)2aminobutane (MDMA)
Mechanism of action.◦INDIRECT SEROTONERGIC AGONIST.
◦Taken up by serotonergic cell through an active channel and induce release of serotonin stores.
◦Also blocks reuptake of serotonin◦It inhibits synthesis of new serotonin ◦ (subsequent doses diminished high &
worsening of drug’s undesirable effects such as psychomotor restlessness & teeth gnashing)
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Methyl-1-(3,4-Methyl-1-(3,4-methylenedioxyphenyl)-methylenedioxyphenyl)-2aminobutane (MDMA)2aminobutane (MDMA)
Mechanism of action.◦Damage serotonin system which may be permanent causing lasting neuropsychiatric disturbances.
◦Functional brain imaging studies are consistent with significant and lasting damage to serotonergic structures.
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Substance Substance AbuseAbuseSummary:
◦Genetics Genes that influence initiation of
drug use.
Transition from initiation to repeated use, abuse, or dependence are largely NONGENETIC factors.
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Substance Substance AbuseAbuseSummary:
◦Personality profile antisocial personality traits in a person’s
biological parents and in person’s own childhood and adolescence predict early onset of substance abuse.
High novelty seeking, low self-directedness, and low cooperativeness have impulse personality disorders characteriized by inability to delay gratification, carry a high risk of comorbid substance abuse.
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Substance Substance AbuseAbuseSummary:
◦Neurobiological POSITIVE REINFORCEMENT
“Pleasure Center” Mesocorticolimbic Dopamine System and its primary target neurons in the VTA, NAc, ventral pallidum and medial prefrontal cortex.
Dopamine “pleasure neurotransmitter”.
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Thank youThank you
Marcelino V. Ostrea Jr.,M.D.
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Stimulants: Stimulants: Methamphetamine & Methamphetamine & CocaineCocaineRepeated, frequent drug use produces
disruptions in homeostatic mechanism and leads to neuroadaptations that may provide the neurobiological basis for consequences such as addiction or the compulsive use of cocaine or amphetamine.
Intermittent exposure – lower the threshold for developing stimulant psychosis.
Chronic exposure – results to tolerance, or decrease in the effects of stimulant drugs, and may result in neurotoxicity.
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Stimulants: Stimulants: Methamphetamine & Methamphetamine & CocaineCocaineAddiction – compulsive drug
seeking and drug taking, with a loss of control over drug use.◦one factor believed to increase
likelihood of relapsed is exposure to sensory cues associated with drug taking.
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Stimulants: Stimulants: Methamphetamine & Methamphetamine & CocaineCocaineNeurochemical Basis of Addiction:
◦Functional imaging studies show that cocaine-related cues are associated with increased activity of the:1. Basolateral amygdala2. Cingulate cortex3. Orbitofrontal cortex
◦Sensory cues mediates association between environmental stimuli & drug effectsLondon et al.1999
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Stimulants: Stimulants: Methamphetamine & Methamphetamine & CocaineCocaineNeurochemical Basis of Addiction:
◦Frontal cortical structures mediating decision making & impulse inhibition, which are closely linked with NAc, amygdala, & VTA, appear to be affected by chronic stimulant exposure
Jentsch and Taylor 1999
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Stimulants: Stimulants: Methamphetamine & Methamphetamine & CocaineCocaineTolerance – larger doses are
needed to produce an effect that previously was obtained at a lower dose.◦Little evidence to support longer-
term tolerance to cocaine’s and amphetamine’s reinforcing effects.
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Stimulants: Stimulants: Methamphetamine & Methamphetamine & CocaineCocaineDependence – presence of withdrawal
symptoms on termination of drug use.◦Stimulants do not produce adaptations in
areas mediating somatic and autonomic function and therefore are not associated with physical withdrawal symptoms.
◦Withdrawal symptoms primarily characterized by DISORDER OF MOOD.
Weddington et al. 1990
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Stimulants: Stimulants: Methamphetamine & Methamphetamine & CocaineCocaineNeurochemical Basis of Dependence:
A DEFICIT OF CENTRAL SEROTONIN TRANSMISSION during stimulant withdrawal is consistent with the hypothesized etiology of clinical depression.
Haney et al. 2001
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Stimulants: Stimulants: Methamphetamine & Methamphetamine & CocaineCocaine
Neurochemical Basis of Neurotoxicity:◦Repeated and toxic doses of methamphetamine increase GLUTAMATE efflux in the striatum which underlies the neuron-damaging effects.
Abekawa et al 1994
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Stimulants: Stimulants: Methamphetamine & Methamphetamine & CocaineCocaine Neurotoxicity
◦ Postmortem analyses of methamphetamine abusers revealed decreased neural level of striatal dopamine, tyrosine hydroxylase, and dopamine transporters in the caudate nucleus and putamen (striatum).
Wilson et al. 1996
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Stimulants: Stimulants: Methamphetamine & Methamphetamine & CocaineCocaineConclusion:
◦Acute administration of stimulant drugs have similar subjective, reinforcing, and discriminative stimulus effects.
◦Repeated exposure results in sensitization or tolerance to certain effects, depending on the dosage and pattern of drug administration.
◦Cocaine’s effect are relatively shorter compared to methamphetamine.
◦Cocaine inhibits the reuptake of dopamine, whereas amphetamine both inhibits dopamine reuptake and promotes dopamine release.