Related Experiment Videos
[The effect of tramadol on the EEG and the electronystagmogram (author's transl)]
Abstract:
1-(m-Methoxyphenyl)-2-(dimethylaminomethyl)-cyclohexan-1-ol (tramadol; Tramal) in oral doses of 150 mg/kg caused no essential changes in the EEG pattern in man. Only the alpha-rhythm of the occipital leads was more synchronized and the amplitude somewhat higher. beta-Waves increased slightly, but the delta-waves were not significantly changed. Tramadol induced no measurable alterations in the electronystagmographic recordings of quick voluntary eye movements or follow-up to-and-fro eye movements. In the optokinetic and postrotatory nystagmus, however, there was a moderate decrease in the total amplitude and maximal angular velocity of the slow nystagmic stage. The results of EEG and electronystagmographic investigations indicate that tramadol has a moderate relaxant (central depressant) effect.
Insights
Tramadol, an analgesic, showed minimal EEG changes in humans at high doses. However, it moderately decreased nystagmus velocity, suggesting a mild central relaxant effect.
Area of Science:
- Neuroscience
- Pharmacology
- Clinical Electrophysiology
Context:
- Tramadol is a widely used synthetic analgesic.
- Understanding its central nervous system effects is crucial for clinical application.
- Previous research has explored its analgesic properties, but CNS effects require further elucidation.
Purpose:
- To investigate the central nervous system effects of tramadol using electroencephalography (EEG) and electronystagmography (ENG).
- To assess the impact of oral tramadol on brainwave activity and eye movement patterns.
Summary:
- Oral administration of 150 mg/kg tramadol in humans resulted in minor EEG alterations, including increased synchronization and amplitude of alpha-rhythm, and a slight increase in beta-waves.
- No significant changes were observed in delta-waves on EEG.
- Electronystagmography revealed no measurable alterations in voluntary or follow-up eye movements, but a moderate decrease in the amplitude and velocity of slow-phase nystagmus in optokinetic and postrotatory tests.
Impact:
- The findings suggest that tramadol possesses a moderate relaxant or central depressant effect.
- This information is valuable for clinicians prescribing tramadol, particularly regarding potential neurological side effects.
- Further research could explore dose-dependent effects and interactions with other CNS-active medications.