NSAIDs Flashcards
definition of peripherial sensitisation
at the site of inflammation you feel pain much better
where in the eicosanoids chain do glucocorticoids have their effect
at phospholipase A2 - they diminish the whole process - most potent
localisation of COX1
stomach, kidney, platelets
localisation of COX2
macrophages, fibroblasts
COX1 production
constitutive - all the time produced
COX2 production
inductive - at site of inflammation
COX1 effects in stomach
produces prostaglandins mainly PGE to protect stomach wall
- decr HCl
- incr mucus secretions
- incr perfusion
what substances inhibit COX3
paracetamol, metamizole
where is COX3 present
in CNS, mainly hypothalamus and thalamus
what effects does inhibiting COX3 have on the body
great antipyretic and analgesic effect
old, non selective NSAIDs
ketoprofen, aspirin
more selective COX2 inhibitors
meloxicam, carprofen
name two coxibs that are extremely selective
deracoxib, firocoxib
absorption of NSAIDs
- usually weak acids - non ionised forms have better transport through membranes
- depends on feed
distribution of NSAIDs
- extensive albumin binding - cannot enter milk
- hypoalbuminaemia
- interactions
- loading dose
metabolism of NSAIDs
mainly glucoronic acid conjugation - feline sensitivity
while there is no NSAIDs authorised for cats for more than one week, which one is actually safe long term
meloxicam
excretion NSAIDs
urine in both inactive and active forms
where in the body would you find GI ulceration as a side effect
stomach and duodenum
two causes of GI ulceration as a side effect
- local irritation - ion trapping of weak acids
- PGE decr
can this GI ulceration be avoided by injecting the drugs
no, bc the PGE decr can cause it anyway
how do we treat GI ulceration
proton pump inhibitors eg omeprazole
should we give NSAIDs to patients with dehydration
no hydrate the animal first - kidney damage
due to the kidney damage, which limitations should we put on usage of NSAIDs
- rehydrate first
- not during anaesthesia - only post operative
- not with preexisting renal disease