MDMA
What three neurotransmitters does MDMA primarily increase in the synapse?
Serotonin, Dopamine, Norepinephrine
What type of glutamate receptor does ketamine primarily block?
NMDA receptor
True or false: Chronic pain always continues because the original physical injury is still present.
False
What is the brain's primary excitatory neurotransmitter?
Glutamate
What term describes having two or more conditions at the same time?
Comorbidity
What drug classification describes MDMA's ability to promote feelings of emotional openness and connection?
Entactogen (empathogen)
What drug classification describes ketamine's ability to produce detachment from the body or surroundings?
Dissociative anesthetic
What is the difference between ascending and descending pain pathways?
Ascending pathways carry pain information toward the brain; descending pathways regulate pain signaling from the brain toward the spinal cord
What neurotransmitter is the brain's primary inhibitory neurotransmitter?
GABA
What does it mean when chronic pain and depression have a bidirectional relationship?
Each can influence or worsen the other
What is the process called when MDMA causes serotonin transporters to move serotonin outward instead of bringing it back into the neuron?
Reverse transport
What mental health condition has ketamine shown rapid therapeutic effects for, particularly when conventional treatments haven't worked?
Treatment-resistant depression
What is central sensitization?
Increased responsiveness of neurons in the central nervous system to sensory input
What is synaptic plasticity?
The ability of connections between neurons to strengthen or weaken over time
A patient with chronic pain experiences worsening pain during periods of emotional distress. What does this demonstrate?
Emotional state can influence pain perception
Why can't reduced pain after MDMA-assisted therapy prove MDMA directly caused pain relief?
Psychotherapy or improvements in PTSD symptoms could also explain it.
What process, involving increased sensitivity of CNS neurons to pain signals, can ketamine help reduce?
Central sensitization
What brainstem regions are commonly involved in descending pain modulation?
PAG and RVM
What is reuptake?
The process of transporting neurotransmitters from the extracellular space back into a neuron
What brain region is especially important in fear processing and is relevant to PTSD?
Amygdala
What two potential alternative pain-modulation mechanisms are discussed for MDMA?
Neuroplasticity and inflammation
How can ketamine's blockade of NMDA receptors on GABA interneurons increase glutamate signaling in some brain circuits?
By reducing inhibitory activity, resulting in disinhibition of excitatory neurons
How could reduced inhibitory GABA signaling contribute to chronic pain?
Less inhibition can allow pain-transmitting neurons to become more excitable, increasing pain signaling
Why is glutamate important for both chronic pain and ketamine's mechanism of action?
Glutamate activates NMDA receptors involved in pain signaling and plasticity, while ketamine blocks those receptors
What is the biggest difference between the current evidence for MDMA and ketamine in chronic pain management?
MDMA's chronic pain benefits remain uncertain; ketamine has demonstrated analgesic effects and is used for certain pain conditions