Assessment and comparison of the performance of cardiac valves.
A statistical method is presented to assess and compare cardiac valve performances. Patient survival and valve performances have been separated, and valve function and malfunction have been described in comprehensive and comparable terms. Formulas are proposed to calculate the significance of the difference between two survival probabilities as well as to calculate the instantaneous rate of events and the median remaining lifetime.
D000206:Actuarial Analysis; D003625:Data Collection / Q000379:methods; D005069:Evaluation Studies as Topic / Q000379:methods; D006350:Heart Valve Prosthesis / Q000009:adverse effects / Q000401:mortality; D006801:Humans; D013223:Statistics as Topic