This is a retrospective data analysis of patients that underwent elective or emergency cardiopulmonary bypass. Resternotomy due to bleeding is frequent after sternotomy. Also due to implementation of Argipressin into clinical practice fluid resuscitation protocol has changed to more vasopressors and less fluid within the past five years. The investigators want to explore the influence of volume resuscitation protocol on incidence of rethoracotomy during the past twenty years.

Inclusion Criteria:

• All patients that underwent elective or emergency aortocoronary bypass at the University Hospital Basel between 2009 and 2020.

Exclusion Criteria:

• None.

All patients that underwent elective or emergency aortocoronary bypass.