Has the evolving anesthetic management in major abdominal surgeries had a positive impact on patients' one-year postoperative mortality and length of hospital stay? Which of the anesthetic management parameters have influenced mortality and hospital stay duration in these patients? To address these questions, we have planned to retrospectively review patients who underwent surgery at our center.

In our study, we aimed to compile our practices over the last 5 years by evaluating the impact of perioperative and postoperative anesthetic management on morbidity and mortality in hepatopancreatobiliary surgical patients. Our primary outcome was to form a comprehensive understanding of our anesthesia experiences during the preoperative, perioperative, and postoperative periods in this patient group. Our secondary outcome was to assess the influence of preoperative and perioperative anesthetic management on the morbidity and mortality of these patients.

Inclusion Criteria:

• The study will include data from patients who have undergone their first operation with the diagnoses of liver malignancy, cholangiocarcinoma, and pancreatic malignancy during the period from October 2017 to February 2022.

Exclusion Criteria:

• Data from patients who were deemed inoperable during the perioperative period after being taken into surgery with their current diagnosis, as well as data from patients who underwent repeat operations, were excluded from the study for their second and subsequent hospitalizations.

data from all patients aged 18 and above who underwent major abdominal surgery with diagnoses of liver malignancy, cholangiocarcinoma, and pancreatic malignancy

All patient data will be kept confidential.