Comparative effect of deliberate hypotensive anesthesia using nitroglycerine vs. phentolamine on event related potentials and cognitive functions in patients undergoing septoplasty... oleh Wael Fathy, Mona Hussein, Rehab Magdy, Hanan H Soliman, Hatem Elmoutaz, Alaa A Meshref, Reem M Sabry, Marwa A Elgaly, Mohammed Fawaz, Dina Y Kassim