Background

Common treatment for acute pain management include paracetamol, NSAIDs and weak opioids for mild to moderate pain, and strong opioids for severe pain. Slow onset of action of oral analgesics. Opioids require monitoring for potential side-effects. Standard analgesic treatment (SAT) for moderate to severe pain is IV paracetamol or IV ketoprofen for moderate pain and IV morphine for severe pain.

Method 1
Acute onset and  fluctuating course 
AND
Is there an acute change in mental status from the person’s  baseline?  Does the abnormal behaviour tend to come and go or increase  and decrease in severity?
Inattention 
AND 
Does the person have difficulty focusing attention?   Are they distracted or having difficulty keeping track of what is  being said?