Palliative care Flashcards
How is oral morphine converted into SC diamorphine?
Divide the 24hr morphine dose by three
How is oral morphine converted to oral oxycodone?
Divide the 24 hour morphine dose by 1.5
oxycodone is preferred to morphine in palliative patients with mild-moderate renal impairment
What is the standard prn ‘rescue dose of morphine for breakthrough pain?
1/6th of the total daily dose of morphine (24hr dose) prn every 2-4 hours as required.
What frequency of prn use should prompt a pain management review for a patient on morphine?
use of prn doses BD or more.
When increasing the regular morphine dose, what should be the maximum dose increment?
the increase should not be more than 1/3 to 1/2 of the TDD every 24 hours. (by 30-50%)
What are the options for analgesia for patients where morphine is not tolerated or is ineffective?
- seek specialist advice on use of oxycodone, buprenorphine, fentanyl or hydromorphone.
- Before swithcing - ensure adjuvant analgesic options have been explored.
- ensure you have attempted to manage side effects.
How should a switch from morphine to another opioid be managed to ensure safety?
- the calculated equivalent dose should be reduced. Reduce dose by 25-50%. Reduce by 50% if high dose.
- seek specialist advice before switching if on high dose morphine >=120mg/24hrs.
How is PO codeine converted to PO morphine?
Divide 24h Codeine dose
by 10
How is PO dihydrocodeine converted to PO morphine?
Divide 24h Dihydrocodeine
dose by 10
How is PO tramadol converted to PO morphine?
Divide 24h Tramadol dose
by 10
How is PO morphine converted to SC morphine?
Divide 24h Morphine dose
by 2
How is PO oxycodone converted to SC oxycodone?
Divide 24h Oxycodone dose
by 1.5
What is the ratio of PO morphine to transdermal fentanyl?
100:1
How is PO morphine (mg/24h) converted to transdermal fentanyl (micrograms/h)?
divide the 24 hour dose of morphine by 24 - this is the hourly morphine dose in mg.
(technically you would divide by 100 to get to the equivalent hourly fentanyl dose in mg. Then x1000 to convert mg to micrograms)
In short, just multiply by 10. This gives the fentanyl patch dose as micrograms/hr.
This is the same for converting PO morphine in mg over 24hrs to buprenorphine patch in micrograms/hr (also 100:1).
What is the ratio of PO morphine to transdermal buprenorphine?
100:1
What are the options for neuropathic pain in palliative care?
- antidepressants - AMT, duloxetine, notriptyline. and
- gabapentinoids - gabapentin, pregabalin are 1st line for both cancer and non-cancer related.
- can combine antidepressant and gabapentinoid if pain uncontrolled with single drug
- steroids an alternative for cancer related neuropathic pain, esp if pain due to SC or or nerve compression.
- specialist advice if persists