Turkish Neurosurgery 2007 , Vol 17 , Num 1
Intracarotid L-arginine Reverses Motor Evoked Potential Changes in Experimental Cerebral Vasospasm
nal ZM1, Adem ASLAN2, Ayenur TA3, H. Zafer KARS4
1,4Cumhuriyet University School of Medicine, Department of Neurosurgery, Sivas, Turkey
2Afyonkarahisar University School of Medicine, Department of Neurosurgery, Afyon, Turkey
3Cumhuriyet University School of Medicine, Department of Neurology, Sivas, Turkey
OBJECTIVE: To investigate motor evoked potentials during short term La rginine infusion in cerebral vasospasm after experimental subarachnoid hemorrhage.

METHODS: Three groups were designated for this study: control group, subarachnoid hemorrhage-saline infusion group, and subarachnoid hemorrhage-L-arginine infusion group. A subarachnoid hemorrhage was created by intracisternal injection of autologous blood in New Zealand rabbits. At the fourth day of subarachnoid hemorrhage, latency and amplitude of motor evoked potentials were recorded during intracarotid saline and L-arginine infusion, and compared with motor evoked potential parameters of the control group.

RESULTS: Motor evoked potential latencies were increased, and amplitudes were decreased in all animals before saline and L-arginine infusion on the fourth day of subarachnoid hemorrhage. A decrease in latencies as well as an increase in motor evoked potential amplitudes was observed with short-term intracarotid L-arginine infusion.

CONCLUSION: Intracarotid short term L-arginine infusion significantly improves motor evoked potential parameters after experimental subarachnoid hemorrhage. Keywords : Cerebral vasospasm, Subarachnoid hemorrhage, L-arginine, Nitric oxide, Evoked potential, Transcranial magnetic stimulation

Corresponding author : nal zm, sofamor@gmail.com