The study of postoperative results in patient series can have several purposes. This goes from a simple description of a device or a technique to the identification of risk factors and the comparison between several devices and between different techniques. RCT can be considered as the “gold standard”, but even non randomized prospective and retrospective series have been used.
The main outcomes under scrutiny are:
- Hospital mortality.
- Long term mortality.
- Valve related events:
- Other cardiac events:
- Non-cardiac events:
For these outcomes, it is useful to make a search for risk factors and independent predictors.