Lecture 4 Flashcards by sita clark

What is the target in the brain of abuse drugs?

The brain’s pleasure centre
Brain reward (dopamine) pathways
These brain circuits are important for natural rewards such as food, music and sex - also associated with drug use
Typically dopamine increases in response to natural rewards such as food
When cocaine is taken, dopamine increase is exaggerated, and communication is altered - happy and lots of energy
For every affect with the drug, there are affects without the drug= e.g. stimulant makes you feels depressed when NOT using it
(action/reaction) (usually opposite)

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What is Ecstasy?

A derivative of amphetamine (amphetamine is the parent drug)
Amphetamine type stimulant
Chemical structure similar to methamphetamine

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What are other names for Ecstasy?

MDMA
XTC
E
Essence
Adam

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How does Ecstasy get into the brain?

15 minutes (empty stomach)
Reaches the brain Easily
1. Disintegrates in stomach
2. “E” absorbed into blood stream from stomach and small intestines
3. Travels to liver and then carried through veins and heart
4. Pumped form heart –> to lungs with blood which becomes oxygenated and returns to heart
5. Oxygenated blood carries “E” to brain and other organs

“feel good drug” = can lead to dependance - psychological and physiological dependance = does change the brain

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What areas of the brain are affected by Ecstasy?

Limbic System stimulated:
Neo cortex
Hypothalamus
Basal Ganglia
Amygdala
Hippocampus

“feel good perception”
systems associated with thinking and problem solving and making good decisions

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What are the Acute Effects of Ecstasy?

Neocortex: Heightened Perceptions
Hypothalamus: Reduced appetite
Basal Ganglia: Stimulation
Amygdala + Hippocampus: Elevated Mood

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What are the Adverse effects of Ecstasy?

Neocortex + Hippocampus = Clouded thinking
Hypothalamus = Hyperthermia
Amygdala= Disturbed behaviour
Neocortex = Jaw clenching

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What damage does ecstasy have on brain areas controlling memory?

Neocortex= Memory impairment
Hippocampus = Memory impairment

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What are the Serotonin Nerve Pathways in the Brain

Raphe Nucleus + through a number of regions

affect limbic system plus other systems associated with thinking and problem solving and making good decisions

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What is the difference of Serotonin Neuron Junction with and without Ecstasy?

increases
Stimulated and release serotonin into synaptic cleft
any that isn’t attached to receptor is taking back into cell through a TRANSPORTER (the target of ecstasy)
transporters= stop serotonin being taken back into cell or increase amount in synapse, which makes neurons fire like crazy, makes you feel great

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What are the Short Term effects after Ecstasy has gone?

Feelings of ecstasy extend/continuing affecting after it has left the body
Ongoing affects
Before: Normal
During Ecstasy: Elevated mood
After Ecstasy: depression like feelings, irritability, clouding thinking

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What are the life threatening effects of ecstasy?

hyperthermia
arrhythmias
renal failure
death= due to “stacking” (overuse)

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What are the Long term effects of Ecstasy?

Neurotoxic?

Brain Chemistry changes:
a. Serotonin reduced
b. Serotonin metabolites reduced
Brain Structure changes:
a. Serotonin transporters reduced
b. Serotonin terminals degnerate

reduced function in the brain proven by cat scans of monkeys

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How does the levels of Serotonin Present in the Cerebral Cortex Neurons change with ecstasy use?

Before: Normal levels of serotonin
2x weeks after Ecstasy: Severely diminished levels of serotonin
7x years after Ecstasy: still diminished levels of serotonin and still less than before Ecstasy use

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What is a difference between past and current MDMA users in regards to Impulsivity?

Compared in Matching Familiar Figure Test(measuring response time)
Current and past MDMA users made Quicker decisions and More Wrong choices before identifying the correct match

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What do we know about the short and long-term effects of Ecstasy on the brain?

Ecstasy has both Short-term and long-term effects on the brain
Short term: changes brain Chemistry and behaviour
Long term: changes brain Structure(fewer neurons) and behaviour and memory and ability to problem solve

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What is the basic brain development?

Very sensitive period of essential brain development
1. Brains are built over time-
development begins well before birth and continues throughout early childhood
2. Biology of the brain is affect by - genes passed from parents to child - the environment of the womb - the experience the child has

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What are the 3 thing the which affects the biology of the brain?

Genes passed from parents –> to child
The environment of the womb
The experiences a child has

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What two questions to we want to know about drugs and the developing brain?

who does prenatal exposure to different drugs and alcohol affect the developing brain and ongoing development?
Which drugs are “Teratogens”?

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What are Teratogens?

An environmental age that causes damage during the Prenatal period
Genetic makeup of the mother and developing organism may enable or hinder their ability to withstand harm
-have a differential affect

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What does the Teratogenic effects of a drug depend on?

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Dose of the Exposure (need a lot/continually use)

Timing of the Exposure and Conditions of the Exposure

How are the Effects of Teratogens dependant on the Timing of the Exposure

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Most vulnerably during embryonic period when the most changes are going on - problem as most people don’t figure out they are pregnant by that time and are already exposing the baby to drugs
Period of dividing zygote/implantation=weeks 1-2 = usually not susceptible to teratogens = prenatal death
Embryonic period = weeks 3-8 = major structural abnormalities
Metal Period/Full term = weeks 9-36 = Physiological Defects and Minor Structural Abnormalities = born pre-term also a risk

What is an example of a Teratogen?

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Prescription and Non-prescription Drugs:
1. Thalidomide= Originally given to mother to avoid morning sickness + sedative
Causes birth defects, shortened/no limbs
2. Diethylstilbestrol (DES)
3. Aspirin = early infant death, decreased motor development
4. Heavy caffeine intake= premature, miscarriage

What are some examples of Stimulants?

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Cocaine

Methamphetamine

How can Cocaine have a teratogenic affect on pre-natal babies?

``` -stimulant LBW Deformities of genital, urinary tract, kidney and heart Brain seizures Behaviour problems Mental Illness ```

How can Methamphetamine have a teratogenic affect on pre-natal babies ?

``` -stimulant LBW Delayed motor development (over first 3 year- not walking as soon e.g.) Behavioural problems Affects males and Maori babies more ```

What are examples of Opiates?

Heroin/ MSTI/ Homebake Methadone/Buprenoprhine- Withdrawl drugs- man made product to give mother opportunity to stop drug taking, to have a healthy pregnancy

How can Heroin/ MSTI/ Homebake have a teratogenic affect on pre-natal babies?

``` -opiate LBW Preterm Birth Withdrawal= high pitch crying, increased muscle tone/hypertonic, irritable, non-nutrient sucking (no-co-ordination and just clench - end up losing weight) Delayed Development SIDS "cot death" ```

How can Methadone/ Buprenorphine have a teratogenic affect on pre-natal babies?

``` -opiate LBW Preterm Birth Withdrawal=high pitch crying, increased muscle tone/hypertonic, sucking (no-co-ordination and just clench - end up losing weight) Delayed Development SIDS "cot death" (as is a depressant) ```

What things have a higher risk, in babies exposed to Tobacco?

``` Higher risk of: Low birth weight Higher risk of Pre-term birth Higher risk for SIDS "cot death" Higher risk of Diabetes Higher Childhood blood pressure Reduction in Gray matter ```

What abnormalities can Teratogenic Pre-natal Tobacco exposure lead to?

CNS Functional Abnormalities or Developmental Problems: 1. Increased internalising(depression) and externalising(aggression) behaviours 2. Increased ADHD and Conduct disorders 3. Increased Aggression

What are some examples of Teratogens?

``` Thalidomide Stimulants Opiates Tobacco Alcohol ```

In what ways can alcohol have a teratogenic effect on pre-natal babies?

Most evidence, don't know dose but know it does cause in high dosages during pregnancy LBW - small head circumference Developmental delay in an number of areas Organ dysfunction Facial abnormalities Poor Co-ordination Poor Social Learning behavioural problems Fetal Alcohol Spectrum Disorder (FASD) Worst outcome : (FAS) = Fetal Alcohol Syndrome

What does FASD stand for?

Fetal Alcohol Spectrum Disorder

What does FAS stand for?

Fetal Alcohol Syndrome Worst outcome of alcohol requires heavy drinking Consistently during pregnancy

What is Fetal Alcohol Syndrome?

Worst teratogenic outcome of alcohol on Prenatally exposed babies Leads to CNS Dysfunction and Organic Brain Damage Lead to Growth Deficiency- Neuronal connections made- and a Specific Pattern of Facial anomalies

What are the 6x outcomes of FAS?

1. hyperactive, attentional deficits 2. intellectual deficits, learning disorders 3. problems with memory, language and judgement 4. Developmental delay, microcephaly 5. Fine and Gross motor problems, seizure disorder 6. Mental retardation, structural brain damage

How does alcohol cause brain damage?

``` Excessive Brain cell death (especially during embryonic period) Reduced cell proliferation Migrational errors in brain development Inhibition of nerve growth factor Disruption of neurotransmitters ```

What is the comparison of 12 years of age of brains of prenatally exposed and non-exposed children?

Effects were ADDITIVE More drugs = Less gray matter = smaller brains More disrupted neuronal pathways

What is the equation which results in Poor outcomes for children?

Poor Outcomes for children = 1. Substance abuse + 2. Psychopathology + 3.Toxic Environments

Which drugs are addictive?

Methamphetamine and amphetamine | not sure if E is addictive

What are man made drugs?

danger: made in laboratories out of different products

How do you get the feel good feeling ecstasy biologically?

Targets the Transporters The transporters stop serotonin being taken back into cell/increase the amount of serotonin in the synapse This increased level of synaptic serotonin makes the neurons fire like crazy Which is what the "feel great feeling" is

When do teratogens have the most effect on prenatal babies?

Babies are Most vulnerably during embryonic period when the most changes are going on - problem as most people don't figure out they are pregnant by that time (weeks 3-8) and are already exposing the baby to drugs

If two mother both take drugs how can their effect on their baby differ?

Dependant on the timing during their pregnancy as to the greatest effect baby could be less effected if exposed outside if the Embryonic period vs exposed during the Embryonic period when they are most vulnerable

What are withdrawal drugs?

Methadone and Buprenorphine high pitch crying, increased muscle tone/hypertonic, sucking (no-co-ordination and just clench - end up losing weight) May have an ongoing withdrawal or have a latent affect

What order is substance abuse and psychopathology in?

Unsure could be one way or another because drugs have an action and a reaction therefore you have one affect with the drug an then the opposite affect without the drug, which can cause you to want the drug again (cyclic affect)

What does toxic environment include?

toxic from drugs | but also toxic from drug abuse/law involvement

Which model are teratogens considered part of?

Medical model approach

What things contribute to predicting the outcome of children?

Health Care system Legal system Ethnicity

Lecture 4 Flashcards

(50 cards)