Itch Flashcards
1
Q
name three chemicals that mediate itch in the skin
A
histamine
PGE2
acetylcholine
2
Q
what nerves transmit itch from the skin?
A
unmyelinated C fibres
3
Q
what are the four causes of itch?
A
pruritoceptive
neuropathic
neurogenic
psychogenic
4
Q
what is pruritoceptive itch?
A
when something in the skin triggers itch
5
Q
what is an example of a cause of pruritoceptive itch?
A
primary biliary cirrhosis
6
Q
what is neuropathic itch?
A
damage of any sort to central or peripheral nerve causing itch
7
Q
what is neurogenic itch?
A
itch due to something acting on CNS receptors
8
Q
name two things that can cause neurogenic itch
A
opiates
hepatocellular liver failure
9
Q
what is psychogenic itch?
A
psychological causes of itch
10
Q
what is a cause of psychogenic itch?
A
delusions of infestation causing itch
