What are the consequences after an open heart surgery on a patient?

It depends: Hopefully improvement in symptoms. If the surgery is for coronary disease and chest pain, doing away with the pain. If it is for a leaking or too tight valve, improvement in things like fatigue and shortness of breath. There of course can be bad consequences such as rhythm problems, kidney failure, anemia, fluid around the lung, pain in the incision, stroke, and even death.

Depends: For what condition? Congenital holes / conditions? May have complete repair /or may need subsequent interventions or surgery. Coronary blockage- bypass and generally improved prognosis. Valves improve and may ned coumadin risks are dying, bleeding, infection, stroke, recurrence.