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Published on: November 6, 2018
Correlation between CSF concentration and side effects after spinal morphine injection in rats.
Neuzimar de Souza Freire Silva1, Rioko Kimiko Sakata, Adriana Machado Issy
1Dor e Terapia Intensiva da Universidade Federal de São Paulo (UNIFESP), São Paulo, SP.
Revista Brasileira De Anestesiologia
|May 28, 2009
Summary
This study found no link between cerebrospinal fluid (CSF) morphine levels and side effects in rats. Spinal morphine may cause adverse events, but concentration did not predict their occurrence.
Area of Science:
- Neuroscience
- Pharmacology
- Pain Management
Background:
- Spinal morphine offers effective pain relief.
- However, its use is associated with potential side effects.
Purpose of the Study:
- To investigate the relationship between cerebrospinal fluid (CSF) morphine concentration and the occurrence of side effects.
Main Methods:
- Four groups of rats received varying doses of spinal morphine (0.1-1 microg).
- Cerebrospinal fluid samples were collected, and side effects were monitored over 180 minutes post-injection.
Main Results:
- Observed side effects included tremors, agitation, pruritus, lack of diuresis, sedation, and respiratory changes.
- The incidence of side effects was highest initially and decreased over time.
- Mean CSF morphine concentrations varied significantly across dosage groups.
Conclusions:
- No correlation was found between CSF morphine concentration and the observed side effects in this rat model.
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