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Summary
Long-term intramuscular pentazocine use can lead to fibrous myopathy, characterized by muscle contractures and limited motion. This condition highlights the need for careful consideration of pentazocine administration.
Area of Science:
- Neurology
- Pathology
Background:
- Intramuscular administration of pentazocine has been linked to potential adverse effects.
- Fibrous myopathy is a rare but serious condition affecting muscle tissue.
Purpose of the Study:
- To investigate the relationship between long-term pentazocine use and the development of fibrous myopathy.
- To describe the clinical and pathological characteristics of pentazocine-induced myopathy.
Main Methods:
- Case study of three patients with a history of prolonged intramuscular pentazocine use.
- Clinical examination focusing on muscle function and range of motion.
- Histopathological analysis of affected muscle tissue.
- Review of relevant animal experimental data.
Main Results:
- Three patients presented with fibrous myopathy, specifically in the quadriceps and deltoid muscles.
- Characteristic findings included fibrotic induration, significant limitation of motion due to contractures, and minimal muscle weakness.
- Animal studies corroborated a link between pentazocine and myopathy.
Conclusions:
- Long-term intramuscular pentazocine can cause fibrous myopathy.
- Judicious use of pentazocine is recommended to prevent this serious complication.
- Further research into the mechanisms of pentazocine-induced myopathy is warranted.
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