A. Primary objective

Identifying risk factors for peri-operative complications in patients who have had COVID-19.

B. Secondary objectives

Identifying peri-operative complications in patients who have had COVID-19. Follow-up of peri-operative complications during hospitalization. Identifying the safe distance at which a patient can be operated after a Sars CoV2 infection without having an increased risk of peri-operative complications.

C. Study inclusion and exclusion criteria

1. Inclusion criteria

   Patients should be included if:

   • are scheduled for elective cardiac surgery with extracorporeal circulation (bypass);
   • they give their consent for their data to be included in studies;

2. Exclusion criteria

Patients should be excluded if:

• they have emergency surgery;
• have had Sars Cov 2 infection more recently than 3 months;

D. Data Collection

It is done in an excel table. Data collection is done anonymously. No patient-identifying data will be collected. The collected data will be about comorbidities, COVID-19 status - disease and vaccination, postoperative complications.

Types of data collection from the patients:

The type of surgery Age Sex Smoking Diabetes History of renal disease Preoperative anemia Preoperative creatinine Preoperative urea BMI NYHA class ASA score EuroScore I Preoperative LVEF Disease COVID -19 Date of illness Hospitalization for COVID-19 COVID 19 vaccination status Necessary vasopressor peri-operative duration and Maximum dose Perioperative positive inotrope required Bypass duration Duration of Aortic clamping Intraoperative transfusions Post operative creatinine - peak level Post-operative urea peak level Duration of post-operative oro-tracheal intubation NIV required Duration of hospitalization in Cardiac Intensive Care Unit Duration of postoperative hospitalization

Inclusion Criteria:

• are scheduled for elective cardiac surgery with extracorporeal circulation (bypass);
• they give their consent for their data to be included in studies;

Exclusion Criteria:

• they have emergency surgery;
• have had Sars Cov 2 infection more recently than 3 months;

Patients hospitalized in the Cardiac Intensive Care Unit 2 IUBCV CC Iliescu for postoperative management.