Pain Management Guidelines

Introduction to Pain Management

The World Health Organization (WHO) recommends following the three-step analgesic ladder for managing nociceptive pain, starting with non-opioid analgesics for mild pain, progressing to weak opioids for moderate pain, and strong opioids for severe pain when other treatments are inadequate 1

Non-opioid analgesics, such as acetaminophen, should be used as first-line treatment for mild to moderate nociceptive pain, with a recommended dose of 650 mg every 4-6 hours, and caution should be exercised in patients with liver failure 1, 2
NSAIDs are particularly effective for inflammatory pain, especially bone pain, and should be used with caution in patients taking methotrexate or nephrotoxic chemotherapy, and consider gastroprotection if GI symptoms develop 1
Acetaminophen should be administered at a dose of 650 mg every 4-6 hours, with a maximum daily dose of 3-4g, according to the National Comprehensive Cancer Network 2
NSAIDs should be used with regular scheduled dosing, such as ibuprofen 400-600 mg every 6-8 hours, as recommended by Anaesthesia 3

Weak opioids, such as codeine, dihydrocodeine, tramadol, and dextropropoxyphene, can be used alone or combined with non-opioid analgesics for moderate pain, with caution when combining tramadol with MAO inhibitors or in patients with epilepsy risk 1

Morphine is the first-line WHO level 3 opioid of choice for moderate to severe pain uncontrolled by previous steps, and should be prescribed without delay when pain is uncontrolled by step 1 and 2 treatments, with oral administration preferred 1
Strong opioids, such as morphine, should be used with caution and monitored closely for respiratory depression, especially in the first 24-72 hours 1
Prolonged opioid use should be avoided due to the risk of dependence and tolerance, as recommended by the National Comprehensive Cancer Network and the American College of Physicians 2, 4

Coanalgesics, such as antidepressants and anticonvulsants, can be used at each level of the WHO ladder to manage neuropathic components of pain, with examples including duloxetine and gabapentin 2
Topical agents, such as lidocaine patch and diclofenac gel, can be used for localized pain 2
Neuropathic pain medications (gabapentin, pregabalin, duloxetine) should be considered for chronic pain management, according to the Annals of Internal Medicine and NCCN guidelines 2, 4

Diagnostic blocks with local anesthetic should be performed to identify specific pain generators, with documentation of pain relief response, including percentage and duration, to inform treatment decisions, according to NCCN guidelines 5, 2
Caudal epidural injections with bupivacaine 0.25% (0.5 ml/kg, max 15ml) with or without steroids, and lumbar interlaminar epidural injections with bupivacaine 0.25% (0.2-0.3 ml/kg) with or without steroids, may be indicated when pain persists despite optimal medication management, as suggested by the Annals of Oncology 6
Neurolytic procedures are appropriate for well-localized pain syndromes, failure to achieve adequate analgesia despite appropriate medication trials, and pain likely to be relieved with specific nerve blocks, as indicated by NCCN guidelines, with a strength of evidence supporting their use in selected patients 5, 2
The BMJ guideline strongly recommends against epidural injections of local anesthetic, steroids, or their combination for chronic axial spine pain, though they may still be appropriate for radicular pain or acute post-procedural pain, with a strength of evidence of Level I 7

Avoid using two products of the same pharmacological class with the same kinetics simultaneously, and reserve opioids for when non-opioid options are inadequate 1
Regular reassessment of pain control and medication effects is essential, and consider cardiovascular, renal, and gastrointestinal risk factors when prescribing NSAIDs 1
A stepwise approach to chronic pain management is recommended, starting with conservative treatments, including physical therapy, appropriate medication trials, and less invasive injection therapies, before considering interventional procedures, as suggested by the National Comprehensive Cancer Network and the American College of Physicians 2, 4
Monitoring for side effects, including respiratory depression with opioids, hypotension with epidural local anesthetics, temporary bladder voiding disorders, and temporary sensory disorders, is crucial, as stated in the NCCN guidelines 2
Potential complications of interventional procedures include infection, bleeding, and temporary sensory disorders, highlighting the need for careful patient selection and procedure planning, as stated in the NCCN guidelines 2

Physical therapy focusing on core strengthening, flexibility, and proper body mechanics may be beneficial, as recommended by Anaesthesia 3
Transcutaneous electrical nerve stimulation (TENS) can be used as an analgesic adjunct, and abdominal binders may provide additional support and pain relief, as recommended by Anaesthesia 3

A complete diagnostic workup should include radiographs of the affected areas (e.g., hip, spine) and MRI of the affected areas if radiographs are nondiagnostic, to identify underlying causes of pain, as recommended by the American College of Radiology and NCCN guidelines 8, 9, 2
CT-guided selective nerve blocks may be considered for diagnostic confirmation of pelvic pain with pudendal nerve involvement, as recommended by the National Comprehensive Cancer Network 2
Ultrasound-guided diagnostic blocks with local anesthetic alone should be performed first to confirm diagnosis of abdominal cutaneous nerve entrapment, and if positive response, then consider therapeutic blocks with local anesthetic and steroid, as suggested by the National Comprehensive Cancer Network 2