There is an increasing evidence base for the use of neuraxial analgesia for chronic non-malignant pain (CNMP), cancer-related intractable pain and spasticity. Several drugs are available for use including opioids, local anaesthetics and adjuvant drugs such as clonidine and ziconotide. This review will focus mainly on the use of neuraxial opioids for CNMP and cancerrelated pain; a brief description of the action of the other drugs will be provided but not discussed in full.
Patient selectionNeuraxial analgesia is considered for use in patients who have resistant intractable pain that fails to respond to other treatment options or pain that responds to analgesia but for which the doses required result in unacceptable side-effects. In rare circumstances it may be used for rapid, effective analgesia when there is limited time available for titration of oral or subcutaneous analgesia (e.g. end-of-life palliative care).Exclusion criteria relate specifically to psychological and psychiatric illness, allergy and certain physiological conditions which may be relative or absolute contraindications. If a significant psychological disorder, personality disorder, addictive personality or frank psychiatric illness is detected during the assessment and history-taking process then the patient is not considered suitable. Other exclusion criteria include depression, senility, suspected pain behaviour, alcohol or opioid abuse and poor physical condition. True allergy to any of the proposed analgesic or adjuvant drugs will preclude their use. Absolute contraindications include coagulation defects, local sepsis at the proposed
Neuraxial (epidural and intrathecal) opioids for intractable painPaul Farquhar-Smith and Suzanne Chapman Summary Points 1. Neuraxial opioids are considered for use in patients who have resistant intractable pain that fails to respond to other treatment options or pain that responds to analgesia but for which the doses required result in unacceptable side-effects. 2. Neuraxial opiods can be considered for both chronic non-malignant pain and chronic cancer-related pain. 3. Effectiveness in chronic non-malignant pain and cancer pain is exerted through the use of either single-agent drugs (opioids) or a combination of drugs: opioids, local anaesthetics and other drugs such as clonodine and ziconotide. 4. Complications of long-term continuous infusion therapy are related to the insertion process (haematoma), the mechanical device (both pump and catheter) and the long-term effects of the drugs. 5. Patients will require ongoing ambulatory monitoring and supportive care.