The aim of this study is to evaluate the differences between men and women undergoing cardiac surgery. We will look at perioperative factors such as body weight, body surface area, previous medical history, pharmacokinetics, transfusion, coagulation, cardiopulmonary bypass (CPB) related factors, cardiac function, inotropic requirements, risk, and outcome scores as well as morbidity and mortality at 30 and 90 days, 1, 5, and 10 years.

Observational, multicentre, retrospective data collection from the mandatory Quality Assurance database (the Netherlands Heart Registry, (NHR), supplemented with data from the electronic patient files (EPIC). The retrospective data is already available.

In addition, we will continue the retrospective study into a prospective registry of data after the analysis of the retrospective data. Patients will be approached one, five and ten years after the operation and a questionnaire will be sent to document quality of life. No research-related interventions other than questionnaires will be performed

Inclusion Criteria:

• Patients > 18 years
• All patients who underwent cardiac surgery from 1 January 2016 to the start of the study, in either of the centres (AMC or VUmc) (retrospective)
• All patients undergoing cardiac surgery from the start of the study (~March 2022) until approximately 2032

Exclusion Criteria:

• Patients who object to the re-use of their care data or do not give consent

The study population will consist of male and female patients, 18 years and older. The study group consists of all patients who underwent cardiac surgery from 1 January 2016 onwards, in either of the centres (AMC or VUmc). The registry will continue for at least 10 years after the inclusion of the last patient.