who analgesic ladder disclaimer: this presentation contains information on the general principles of...

WHO Analgesic Ladder

Disclaimer: This presentation contains information on the general principles of pain management. This presentation cannot account for individual variation among patients and cannot be considered inclusive of all proper methods of care or exclusive of other treatments. It is the responsibility of the treating physician, or health care provider, to determine the best course of treatment for the patient. Treat the Pain and its partners assume no responsibility for any injury or damage to persons or property arising out of or related to any use of these materials, or for any errors or omissions.

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Objectives

• Review the World Health Organization (WHO) analgesic ladder• Discuss treatment for mild, moderate, or severe pain• Review additional treatment principles when using opioids

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Background

• The WHO analgesic ladder was introduced in 1986– 3-step ladder for adults– Updated in 2012 to include 2-step ladder for children

• Framework for pharmacological management of pain• 80-90% of patients are effectively treated using the WHO 3-

step approach

http://www.who.int/cancer/palliative/painladder/en/

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Mild pain

Moderate pain

Severe painStep 1

Non-opioid

Step 2 Weak opioid

Step 3 Strong opioid

+/- adjuvant

+/- non-opioid+/- adjuvant

+/- non-opioid+/- adjuvant

Consider prophylactic laxatives to avoid constipation

Step up if pain persists

or increases

Step up if pain persists

or increases

Non-opioids ibuprofen or other NSAID, paracetamol (acetaminophen), or aspirin

Weak opioids codeine, tramadol, or low-dose morphine

Strong opioids morphine, fentanyl, oxycodone, hydromorphone, buprenorphine

Adjuvants antidepressant, anticonvulsant, antispasmodic, muscle relaxant, bisphosphonate, or corticosteroid

Combining an opioid and non-opioid is effective, but do not combine drugs of the same class.

Time doses based on drug half-life (“dose by the clock”); do not wait for pain to recur

Adapted by Treat the Pain from World Health Organization http://www.who.int/cancer/palliative/painladder/en/ (accessed 7 November 2013)

WHO Analgesic Ladder: adults

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Using the WHO ladder for adults

Beating Pain, 2nd Ed. APCA (2012)

• Mild pain - start with a non-opioid, for example with regular paracetamol or non-steroidal anti-inflammatory drug (NSAID), then move up steps if pain remains uncontrolled

• Moderate - start with a weak opioid, for example, codeine or low-dose morphine

• Severe - start with a strong opioid, for example, morphine, to control pain early

• Adjuvants can be used at any step

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Step 1 – mild pain: non-opioids

Paracetamol

• Adult dose: 500mg-1g by mouth every 6 hours; maximum daily dose 4g

• Note: Hepatoxicity can occur if more than the maximum dose is given per day

• Patients with liver impairment should use lower amounts or avoid use altogether

• Paracetamol can be combined with an NSAID


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Ibuprofen (NSAID)

• Adult dose: 400mg by mouth every 6-8 hours; maximum daily dose 1.2g

• Give with food and avoid in asthmatic patients


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Diclofenac (NSAID)• Adult dose: 50mg by mouth every 8 hours; maximum daily

dose 150mg• Give with food and avoid in asthmatic patients


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Cautions with NSAIDs

NSAIDs can cause serious side effects, particularly after using for more than 7-10 days

• Gastro-intestinal (GI) bleeding or renal toxicity

– If GI symptoms occur, stop and give H2 receptor antagonist. e.g. Ranitidine

• Not for use in patients with renal impairment


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Step 2 – moderate pain: weak opioids

Tramadol• Adult dose: 50-100mg by mouth every 4-6 hours • Start with a regular dose and increase if no response (dose

limit: 400mg/day)• Use with caution in epileptic cases, especially if patient is

taking other drugs that lower the seizure threshold• May cause serotonin syndrome in patients on other

serotonergic medications


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Codeine• Adult dose: 30-60mg by mouth every 4 hours; maximum daily

dose 240mg• If pain relief is not achieved with 240mg/day, move to strong

opioid • Can be combined with Step 1 analgesic• Give laxative to avoid constipation unless patient has

diarrhoea• Genetic variability can lead to variable rates of metabolism

which may make codeine ineffective or lead to excessive side effects


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Low-dose morphine• Some palliative care experts recommend using low-dose

morphine in step 2 because it is associated with fewer side effects compared to other weak opioids


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Step 3 – severe pain: strong opioids

Morphine• “Gold standard” against which other opioid analgesics are

measured• When used correctly, patients don’t become dependent or

addicted, tolerance is uncommon, and respiratory depression doesn’t usually occur


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Less commonly used strong opioids (covered in separate lecture)• Fentanyl• Oxycodone• Hydromorphone• Methadone


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Morphine• Adult starting dose: 2.5–20mg by mouth every 4 hours

depending on age, previous use of opiates, etc. – Patients changing from regular administration of a Step 2

opioid: 10mg by mouth every 4 hours– If the patient has experienced weight loss from sickness or

has not progressed onto Step 2 analgesics: 5mg by mouth every 4 hours

– Frail or elderly patients: 2.5mg by mouth every 6 to 8 hours due to the likelihood of impaired renal function


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• Morphine is available as immediate-release or sustained-release formulations

• Immediate-release– Dose every 4 hours– Use to titrate starting dose and treat breakthrough pain

Beating Pain, 2nd Ed. APCA (2012).

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• Sustained-release (or slow-release)– Dose every 8-24 hours, depending on the formulation– After determining daily dose with immediate-release

morphine, can change to sustained-release morphine, being careful to adjust dose as needed to maintain the total daily dose

• Priority should be given to making immediate-release formulations available

Beating Pain, 2nd Ed. APCA (2012).

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Morphine• Increase dose gradually until pain is controlled• The correct morphine dose is the one that gives pain relief

without side effects: there is no ‘ceiling’ or maximum dose


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Caution: pethidine

Pethidine is not suitable for patients with chronic pain • It has a faster onset of action and a shorter duration of action

than morphine and needs more frequent dosing: every 2–3 hours

• Pethidine is metabolised to norpethidine which has side effects inducing central nervous system excitability including mood changes, tremors, myoclonus (sudden jerking of the limbs) and convulsions

• Pethidine was removed from the WHO essential medicines list in 2003 because it was judged to be inferior to morphine due to its toxicity on the central nervous system and is generally more expensive than morphine

Beating Pain, 2nd Ed. APCA (2012); The Selection and Use of Essential Medicines – WHO Technical Report Series, No. 920. 2003.

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Treatment principles

• By the mouth: Use the oral route whenever possible• By the clock: Administer analgesics according to regular

schedule based on duration of effectiveness rather than “as needed”, except when titrating dose

• By the ladder: Use the WHO analgesic ladder. If after giving the optimum dose an analgesic does not control pain, move up the ladder; do not move sideways in the same level

• By the patient: The right dose is the one that relieves pain. Titrate the dose upwards until pain is relieved or side effects prevent moving up further


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Stopping or changing opioids

• When stopping an opioid, reduce daily dose by 25% each day to avoid symptoms of withdrawal

• When changing from one opioid to another, be mindful of the need to convert doses– Check reference materials or consult an expert

Oxford Textbook of Palliative Medicine (2010)

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Key treatment principle: prophylactic laxatives

• All patients on opioids are at high risk for constipation, and laxatives should be ordered unless contraindicated


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Take home message

• The WHO ladder, an important tool of managing pain, can effectively treat 80-90% of the patients at this facility

• For non-responsive pain, please refer to a pain specialist

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Practical Assessment

Esther, a 28 year-old woman with cancer, reports a pain score of 5 out of 10. Which medicines would you consider prescribing? A. CodeineB. TramadolC. Low-dose morphineD. Any of the above

If you prescribe low-dose morphine, what is Esther’s starting dose? 2.5mg every four hours

What other prescriptions must be written at the same time? Laxatives

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References

• African Palliative Care Association. Beating Pain: a pocketguide for pain management in Africa, 2nd Ed. [Internet]. 2012. Available from: http://www.africanpalliativecare.org/images/stories/pdf/beating_pain.pdf

• African Palliative Care Association. Using opioids to manage pain: a pocket guide for health professionals in Africa [Internet]. 2010. Available from: http://www.africanpalliativecare.org/images/stories/pdf/using_opiods.pdf

• Amery J, editor. Children’s Palliative Care in Africa [Internet]. 2009. Available from: http://www.icpcn.org/wp-content/uploads/2013/08/Childrens-Palliative-Care-in-Africa-Full-Text.pdf

• Kopf A, Patel N, editors. Guide to Pain Management in Low-Resource Settings [Internet]. 2010. Available from: http://www.iasp-pain.org/files/Content/ContentFolders/Publications2/FreeBooks/Guide_to_Pain_Management_in_Low-Resource_Settings.pdf

• The Palliative Care Association of Uganda and the Uganda Ministry of Health. Introductory Palliative Care Course for Healthcare Professionals. 2013.

who analgesic ladder disclaimer: this presentation contains information on the general principles of...

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