Neurology class 3 Flashcards
psychological dependence
caused by decreased activity in the ventromedial prefrontal cortex which leads to decreased impulse control
opioids, ketamine, PCP, mushrooms, DMT, benzodiazepines
‘downers’
cannabinoids, alcohol, nicotine
‘mixed’
CNS stimulants, psychoactive stimulants
‘uppers’
altered mood, relaxation (euphoria), uninhibited behaviour
desired effect of downers
modulate serotonin, increase dopamine, inhibit substance P, decrease glutamate, inhibit ion channel transport
dynamics of downers
opioid dynamics
inhibition of substance P produces analgesia and the more drug there is the more dopamine (reward pathway) is released
- decreased neuronal excitation which causes CNS depression
most potent opioid
fentanyl
least potent opioid
codeine
what to monitor for patients on opioids
- orthostatic hypotension due to peripheral vasodilation
- itching due to mast cell stimulation and histamine release
- nausea due to substance P binding
fentanyl
‘downer’
extremely potent and commonly laced into other drugs
Heroin
‘downer’
highly lipophilic and crosses the BBB quickly
- commonly combined with fentanyl and if so then it is poison
ketamine
dissociative anesthetic; ‘downer’
- potent, high sedation, causes amnesia, and respiratory depression
- known as date rape drug
PCP
derivative of ketamine; ‘downer’
- originally developed for anesthesia
- goes from excitation to sedation but depends on dosage
mushrooms
hallucinogenic; ‘downer’; increases GABA and decreases glutamate
- low potency and low addiction