TY - BOOK AU - Mohamed Nabil Elshafei Abdulkader AU - Mohammed Ebrahim Amin , AU - Nevan M. Abass Elmekawy , AU - Sahar Mohamed Elshal , TI - The use of heart rate variability (HRV) and heart rate complexity (HRC) as predictors for patient's response to deliberate hypotensive anaesthesia during functional endoscopic sinus surgery (FESS) / PY - 2018/// CY - Cairo : PB - Mohamed Nabil Elshafei Abdulkader , KW - FESS KW - HRC KW - HRV N1 - Thesis (M.Sc.) - Cairo University - Faculty of Medicine - Department of Anaesthesia; Issued also as CD N2 - Deliberate hypotensive anaesthesia (DH) is a technique in which the arterial blood pressure is reduced in a predictable and controlled manner. The main advantage of this technique is to minimize bleeding and improve the surgical field to achieve better intra-operative conditions and less post-operative complications. Several techniques have been used to produce DH including: direct vasodilators, beta blockers, alpha2 adrenergic agonists, and calcium channel blockers. Nitroglycerin is widely used in induction of hypotensive anaesthesia being a potent direct venodilator at low dose and arteriodilator at high dose reducing both preload and afterload ER -