Inclusion Criteria:  Indication for elective minimally invasive (open) aortic or mitral valve surgery Patient's ability to understand the nature and extent of the individual's requirements for participation in the new care setting Classification of the patient as "FIT" or "Pre-FRAIL" using the LUCAS functional index (frailty index) (Dapp et al. 2012)  Exclusion Criteria:  Limited life expectancy less than one year (e.g., advanced tumor disease) Urgent or emergency interventions Severe comorbidities or psychosocial reasons that militate against participation or do not allow for written informed consent Lack of a social environment that can provide supportive patient care