Electrically induced arterial thrombosis model in the conscious rat

Area of Science:

• Neuroscience
• Pharmacology
• Cardiovascular Research

Background:

• Thrombus formation in cerebral arteries can lead to neurological deficits.
• Assessing antithrombotic efficacy requires reliable models of occlusive thrombosis.
• The loss of righting reflex in rats serves as an indicator of severe cerebral hypoperfusion.

Purpose of the Study:

• To establish a rat model of electrically induced carotid artery thrombosis.
• To evaluate the efficacy of various antithrombotic agents in preventing or delaying thrombus progression.
• To correlate cortical tissue oxygen levels with neurological impairment.

Main Methods:

• Electrically induced thrombus formation in the left common carotid artery of rats with pre-occluded vertebral and right carotid arteries.
• Monitoring the loss of righting reflex as an endpoint, correlating it with cortical tissue pO2.
• Administering heparin, ticlopidine, BM 13177, acetylsalicylic acid, OKY O46, and dazmegrel to assess antithrombotic activity.

Main Results:

• Loss of righting reflex occurred when cortical tissue pO2 decreased to 55 +/- 9% of baseline.
• Heparin, ticlopidine, and the thromboxane-endoperoxides receptor blocker BM 13177 significantly delayed the loss of righting reflex.
• Acetylsalicylic acid and thromboxane synthetase inhibitors (OKY O46, dazmegrel) showed no significant effect.

Conclusions:

• The model effectively simulates occlusive carotid artery thrombosis and subsequent neurological compromise.
• Heparin, ticlopidine, and BM 13177 demonstrate significant antithrombotic effects in this model.
• Thromboxane synthetase inhibition is not effective in preventing thrombus progression in this specific experimental setup.