Non-invasive Stroke Volume-based fluid Management in Elderly Patients Undergoing Hip Fracture Surgery Under Spinal Anaesthesia

The study is going to be a single-centre prospective randomized trial. Patients will be randomly allocated to either control group (anesthetist-directed fluid therapy) or goal directed fluid therapy group, in which fluid therapy was guided by stoke volume (SV) algorithm with the use of Nexfin monitor. Primary outcome measures were the time to hospital discharge since surgery and the occurence of complications developed during the postoperative period. Secondary outcomes included the incidence of intraoperative hypotensive episodes (with MAP\<65mmHg) in both groups and the requirement of vasoactive drugs to support blood pressure