The primary objective of the study is to prospectively analyse the occurrence of post-interventional internal vena jugularis (VJI) thrombi after minimally invasive cardiac surgery using a VJI cannula to perform cardiopulmonary bypass (CPB). The study follows the question whether the performance of a jugular cannulation for the operation under CPB regularly causes wall thromboses despite continuous anticoagulation and a short length of stay of a few hours. The thromboses to be assessed for the study will be obtained by bedside (Doppler) sonography by experienced intensive care physicians in the cardiac surgery intensive care unit. A prospective analysis of all minimal invasive procedures performed with regard to thrombi in the VJI.

Inclusion Criteria:

- Minimally invasive cardiac surgery carried out using complete cardiopulmonary bypass.

Exclusion Criteria:

• Postoperative support by veno-venous or veno-arterial extracorporeal membrane oxygenation.
• Complications of neck cannula placement or removal.
• Pre-existing occlusion of the vena jugularis interna
• Pre-existing thrombosis of the vena jugularis interna
• Pre-existing prothrombotic coagulation disorder
• Existing catheterisation of the vena jugularis interna within 14 days
• Pre-existing anatomical anomaly of the vena jugularis interna

All patients undergoing minimally invasive cardiac surgery requiring full cardiopulmonary bypass at our centre during the observation period.

Due to national legal restrictions, the publication of individual participant data is not possible without significant obstacles.