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Pain Management and Opioid Use
Research Guide
What is Pain Management and Opioid Use?
Pain Management and Opioid Use is the clinical practice of assessing, treating, and mitigating pain through methods including opioid analgesics, with emphasis on postoperative pain, cancer-related pain, persistent pain in elderly patients, genetic variations in pain perception, assessment tools, and effects on quality of life.
This field encompasses 47,764 works addressing pain management challenges in postoperative, cancer, and elderly patient contexts, alongside opioid use and genetic factors influencing pain perception. Key assessment tools like the 11-point numerical pain rating scale (PI-NRS) and Brief Pain Inventory enable standardized measurement of pain intensity and its global application in cancer care. Studies evaluate opioid prescribing guidelines to balance efficacy and risks in chronic pain treatment.
Topic Hierarchy
Research Sub-Topics
Persistent Postsurgical Pain Mechanisms
Researchers investigate neuroinflammatory pathways, central sensitization, and genetic risk factors contributing to chronic pain transition after surgery. Studies employ longitudinal cohorts and neuroimaging to identify predictive biomarkers for prevention strategies.
Opioid-Induced Hyperalgesia and Tolerance
This sub-topic examines NMDA receptor-mediated pronociceptive effects and mu-opioid receptor desensitization during chronic opioid therapy for pain management. Clinical trials test adjunctive therapies like ketamine to reverse tolerance and hyperalgesia.
Neuropathic Pain Pharmacotherapy Meta-Analyses
Systematic reviews synthesize evidence on gabapentinoids, SNRIs, and tricyclic antidepressants for diabetic neuropathy and postherpetic neuralgia. Researchers perform network meta-analyses to rank efficacy, safety, and number-needed-to-treat across populations.
Cancer Pain Assessment Tools Validation
Validation studies test Brief Pain Inventory, Numeric Rating Scales, and multidimensional tools in oncology settings for responsiveness to analgesics. Cross-cultural adaptations ensure utility in diverse patient cohorts including palliative care.
Genetic Variability in Opioid Response
Pharmacogenomic research identifies CYP2D6, OPRM1, and COMT polymorphisms influencing morphine metabolism and analgesic efficacy. Genome-wide association studies guide personalized dosing to minimize adverse events.
Why It Matters
Pain management directly influences patient quality of life, as uncontrolled cancer pain represents a global public health issue addressed by tools like the Brief Pain Inventory, which facilitates better assessment and treatment (Cleeland Cs, Ryan Km (1994)). The CDC Guideline for Prescribing Opioids for Chronic Pain—United States, 2016 provides recommendations to improve safety and effectiveness of long-term opioid therapy while reducing associated risks (Dowell, Haegerich, Chou (2016)). For instance, Farrar et al. (2001) established that a 2-point or 30% change on the 11-point PI-NRS indicates clinically important improvement in chronic pain intensity, guiding therapeutic decisions in clinical practice. Persistent postsurgical pain affects recovery, with identified risk factors informing prevention strategies (Kehlet, Jensen, Woolf (2006)). These approaches impact anesthesiology, oncology, and primary care by standardizing pain grading and pharmacotherapy, such as in neuropathic pain where meta-analyses grade treatment efficacy (Finnerup et al. (2015)).
Reading Guide
Where to Start
'Clinical importance of changes in chronic pain intensity measured on an 11-point numerical pain rating scale' by John T. Farrar et al. (2001), as it provides foundational metrics for interpreting PI-NRS changes (e.g., 2-point threshold) essential for any pain management research.
Key Papers Explained
Farrar et al. (2001) 'Clinical importance of changes in chronic pain intensity measured on an 11-point numerical pain rating scale' establishes PI-NRS benchmarks, which Cleeland Cs and Ryan Km (1994) 'Pain assessment: global use of the Brief Pain Inventory' extends to multidimensional cancer pain tools. Dowell, Haegerich, and Chou (2016) 'CDC Guideline for Prescribing Opioids for Chronic Pain—United States, 2016' applies these assessments to opioid safety protocols. Raja et al. (2020) 'The revised International Association for the Study of Pain definition of pain: concepts, challenges, and compromises' refines foundational concepts, while Melzack (1987) 'The short-form McGill pain questionnaire' offers complementary qualitative scoring. Kehlet, Jensen, and Woolf (2006) 'Persistent postsurgical pain: risk factors and prevention' builds on these for surgical contexts.
Paper Timeline
Most-cited paper highlighted in red. Papers ordered chronologically.
Advanced Directions
Frontiers center on integrating revised IASP pain definitions (Raja et al. (2020)) with opioid guidelines (Dowell et al. (2016)) for personalized pharmacotherapy in neuropathic pain (Finnerup et al. (2015)). Emphasis persists on risk factors for postsurgical pain (Kehlet et al. (2006)) and severity grading (Von Korff et al. (1992)) amid stable publication growth.
Papers at a Glance
| # | Paper | Year | Venue | Citations | Open Access |
|---|---|---|---|---|---|
| 1 | Clinical importance of changes in chronic pain intensity measu... | 2001 | Pain | 5.5K | ✕ |
| 2 | Pain assessment: global use of the Brief Pain Inventory. | 1994 | PubMed | 5.3K | ✕ |
| 3 | CDC Guideline for Prescribing Opioids for Chronic Pain—United ... | 2016 | JAMA | 5.1K | ✓ |
| 4 | The revised International Association for the Study of Pain de... | 2020 | Pain | 4.4K | ✓ |
| 5 | The short-form McGill pain questionnaire | 1987 | Pain | 4.3K | ✕ |
| 6 | MEASUREMENT OF PAIN | 1974 | The Lancet | 4.2K | ✕ |
| 7 | Persistent postsurgical pain: risk factors and prevention | 2006 | The Lancet | 3.9K | ✕ |
| 8 | Pharmacotherapy for neuropathic pain in adults: a systematic r... | 2015 | The Lancet Neurology | 3.7K | ✓ |
| 9 | The measurement of clinical pain intensity: a comparison of si... | 1986 | Pain | 3.2K | ✕ |
| 10 | Grading the severity of chronic pain | 1992 | Pain | 3.0K | ✕ |
Frequently Asked Questions
What constitutes a clinically important change in chronic pain intensity on the 11-point numerical pain rating scale?
A change of approximately 2 points or 30% from baseline on the 11-point PI-NRS represents a clinically important difference in chronic pain intensity. John T. Farrar et al. (2001) in 'Clinical importance of changes in chronic pain intensity measured on an 11-point numerical pain rating scale' determined this threshold through patient and physician assessments. This metric aids in evaluating treatment efficacy across studies.
How is the Brief Pain Inventory used in pain assessment?
The Brief Pain Inventory is a tool for measuring pain intensity and its interference with daily activities, widely applied globally for cancer pain. Cleeland Cs and Ryan Km (1994) in 'Pain assessment: global use of the Brief Pain Inventory' developed it through WHO collaboration to overcome barriers in pain measurement. It supports standardized evaluation to reduce undertreatment of cancer pain.
What does the CDC guideline recommend for opioid prescribing in chronic pain?
The CDC Guideline for Prescribing Opioids for Chronic Pain—United States, 2016 aims to enhance communication on opioid benefits and risks while improving treatment safety. Deborah Dowell, Tamara M. Haegerich, and Roger Chou (2016) emphasize reducing long-term opioid therapy risks. It provides evidence-based strategies for clinicians managing non-cancer chronic pain.
What is the revised IASP definition of pain?
The International Association for the Study of Pain defines pain as 'An unpleasant sensory and emotional experience associated with actual or potential tissue damage, or described in terms of such damage.' Srinivasa N. Raja et al. (2020) in 'The revised International Association for the Study of Pain definition of pain: concepts, challenges, and compromises' updated this to reflect current understanding. The revision addresses conceptual challenges in pain taxonomy.
How does the short-form McGill Pain Questionnaire assess pain?
The SF-MPQ uses 15 descriptors rated on a 0-3 intensity scale to derive sensory, affective, and total pain scores. Ronald Melzack (1987) in 'The short-form McGill pain questionnaire' designed it for efficient clinical and research use. It captures multidimensional pain qualities more comprehensively than intensity alone.
What factors grade the severity of chronic pain?
Chronic pain severity is graded using measures of pain intensity, disability, persistence, and recency of onset. Michael Von Korff et al. (1992) in 'Grading the severity of chronic pain' validated this method for population surveys and primary care. Grades range from Grade I (low disability) to Grade IV (high disability), aiding resource allocation.
Open Research Questions
- ? What precise thresholds on multi-item pain scales like the SF-MPQ best correlate with clinical importance beyond simple intensity changes?
- ? How do genetic variabilities interact with opioid pharmacotherapy to influence persistent postsurgical pain outcomes?
- ? Which combinations of non-opioid pharmacotherapies most effectively prevent progression to high-grade chronic pain in elderly postoperative patients?
- ? What updated risk stratification models integrate IASP pain definitions with opioid prescribing guidelines for cancer pain?
- ? How can pain assessment tools be refined to better predict quality-of-life impacts in neuropathic pain across diverse populations?
Recent Trends
The field maintains 47,764 works with no specified 5-year growth rate, reflecting sustained focus on core topics like postoperative pain and opioid guidelines.
High-impact papers such as the 2020 IASP pain definition revision by Raja et al. continue to shape taxonomy, while 2016 CDC guidelines by Dowell et al. remain central to opioid prescribing debates.
No recent preprints or news coverage indicate steady rather than accelerating activity.
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