Mean flow velocity (MFV) curves according to the route of arginine administration. This figure compares the MFV following administration of normal saline and L-arginine via different routes. (A) Comparison of MFV after intracisternal administration of normal saline and L-arginine. A significant decrease in MFV was observed following L-arginine administration compared to normal saline. (B) Comparison of MFV after intracarotid administration of normal saline and L-arginine. A significant decrease in MFV was observed following L-arginine administration compared to normal saline. (C) Comparison of the effect of L-arginine administration route on MFV, showing that intracarotid infusion significantly reduced MFV compared to intracisternal route.