Inclusion Criteria:  65 years and older 1-3 ASA anesthesia risk Planned to undergo proximal femoral surgery due to intertochanteric fracture  Exclusion Criteria:  cardiac arrhythmia, chronic renal failure and those on dialysis, heart failure, aortic insufficiency, active lower/upper respiratory tract infections, inferior vena cava cannot be clearly visualized by USG, BMI>35, Patients in need of postoperative intensive care or ASA4, Patients with advanced obstructive or restrictive respiratory diseases, Patients under 65 years of age.