Investigators aimed to compare the restrictive and liberal blood transfusion methods applied in major surgical operations performed in Anesthesiology and Reanimation Clinic and investigate their effects on postoperative transfusion needs, morbidity and mortality.

The test subjects consisted of 892 patients, who belong to ASA (American society of Anesthesiology) I -IV groups, underwent elective major surgery between the 01/01/2016-31/12/2016, and are over the age of 18 years. The demographic data (Age, sex, ASA (American society of Anesthesiology) scors, surgery type) were also recorded. we evaluated the value of Hemoglobin, platelet, APTT (activated partial thromboplastin time), INR (international normalized ratio) preoperatively and postoperatively. In this study, restrictive and liberal blood transfusion groups were investigated.restrictive and liberal transfusion hemoglobin threshold value respectively before perioperative transfusion was 8 g / dL. were defined as restrictive blood transfusion group and perioperative transfusion was over 8 g / dL were defined as liberal blood transfusion group. Adverse events (tachycardia, hypotension, the value of lactate and metabolic acidosis). Postoperatively, the amount of postoperative transfusion unit, duration of hospital stay, requirement of intensive care unit and mortality rate.

Inclusion Criteria:

• Over 18 years old patients,
• ASA I-II-III-IV,
• Major surgeries ( Intra-abdominal, intracranial, head and neck malignancy surgery, femur and vertebra surgery)

Exclusion Criteria:

• Emergency operation,
• Cardiovascular surgery,
• ASA V-VI
• Under 18 years old patients

Over 18 years old patients, ASA I-II-III-IV, major surgeries ( Intraabdominal, intracranial, head and neck malignanacy surgery, femur and vertebra surgery) were enrolled.

there is no plan to make individual participant data (IPD) available to other researchers.