Inpatient Pain Management for Cancer Patients
Pain Assessment
- The American Society of Clinical Oncology recommends that all cancer patients should be evaluated for pain at every clinical encounter using standardized self-reporting tools such as visual analog scales (VAS), numerical rating scales (NRS), or verbal rating scales (VRS) 1, 2
- The key screening question should be: "What has been your worst pain in the last 24 hours on a scale of 0-10?" where 0 is no pain and 10 is the worst imaginable 1
- Comprehensive assessment should include pain characteristics, presence of trigger factors and relieving factors, quality of pain, and impact on daily activities, sleep, mood, and quality of life 1, 3
- For patients with cognitive impairment, observe pain-related behaviors such as facial expressions, body movements, vocalizations, and changes in interactions 1, 4
Pharmacological Management Based on Pain Intensity
- For mild pain (NRS 1-4), the European Society for Medical Oncology recommends non-opioid analgesics such as acetaminophen/paracetamol (maximum 4000 mg/day) or NSAIDs 5, 2
- For moderate pain (NRS 5-7), add weak opioids (codeine, dihydrocodeine, tramadol) to non-opioid analgesics 5, 2
- For severe pain (NRS 8-10), the National Comprehensive Cancer Network recommends strong opioids such as morphine (preferred first-line), hydromorphone, oxycodone, or fentanyl 2, 6
Principles of Opioid Administration
- Provide around-the-clock dosing for persistent pain rather than "as needed" 4, 2
- Include breakthrough doses (typically 10-15% of total daily dose) for transient pain exacerbations 2, 6
- Titrate doses rapidly to achieve effective pain control 2
- Adjust the baseline opioid regimen if more than four breakthrough doses are needed daily 2
Management of Opioid Side Effects
- Anticipate and proactively manage common side effects such as constipation, nausea/vomiting, and central nervous system toxicity 2
- Monitor patients with hepatic and renal impairment closely, starting with lower doses and titrating slowly
Adjuvant Analgesics
- For neuropathic pain, consider anticonvulsants (gabapentin, pregabalin), antidepressants (tricyclics, SNRIs), and corticosteroids 2, 6
- For bone pain, consider bone-modifying agents (bisphosphonates, denosumab) 2, 6
Non-Pharmacological and Interventional Approaches
- Consider radiation therapy for localized bone pain 2, 6
- Consider surgical stabilization for impending fractures 2, 6
Monitoring and Follow-up
- Assess pain during each contact or at least daily for inpatients 8
- Reassess both pain and analgesic side effects regularly 1
- Review analgesic regimen if side effects are present and/or pain persists 1
- Provide written follow-up pain plan, including prescribed medications 8
Common Pitfalls to Avoid
- Underestimating pain severity in patients with cognitive impairment 1, 4
- Failing to recognize that most cancer patients have at least two types of cancer-related pain 1, 3
- Inadequate titration of opioids leading to poor pain control 2
- Not addressing opiophobia in patients and families 3, 9
- Neglecting to provide prophylactic management of opioid side effects 2
- Overlooking the psychosocial impact of pain on patients 3