A Retrospective Cohort Study in patients over 55: Mechanical versus Biological valve prostheses

Results Of the 138 patients, 59.8% (n = 61) of the patients with biological valves and 58.3% (n = 21) of the patients with mechanical survived between 5 to 10 years. The unpaired t-test and the chi-squared test performed showed that there was no statistically significant difference in the survival of patients who had biological valves and those who had mechanical valves. Discussion/Conclusion This study suggests that the type of valve prosthesis implanted does not affect the survival of the patients.