1. * Professor and Chairman, Department of Anesthesiology, American University of Beirut, Beirut, Lebanon.† Associate Professor of Surgery, Department Surgery, American University of Beirut, Beirut, Lebanon.† Resident, Department of Anesthesiology, American University of Beirut, Beirut, Lebanon.§ Assistant Professor, Department of Anesthesiology, American University of Beirut, Beirut, Lebanon.∂ Asso