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Abstract
Background: Recent decades showed steady increase in the number of cases referred for redo cardiac surgery, which are associated with increased risk of morbidity and mortality compared to the first-time operations. We aimed to investigate the risk factors for hospital mortality and morbidity in patients who underwent mitral valve replacements for previous mechanical mitral valve dysfunction. Methodology: sixty patients underwent the study from October 2014 till March 2015. Preoperative, operative, and postoperative data were analyzed and evaluated for risk factors affecting hospital mortality and morbidity. Results: The hospital mortality was 16.66%. New York Heart Association functional class, pulmonary hypertension, neurological event, total bypass time, cross clamp time, hepatic dysfunction and renal impairment are the most important risk factors for hospital mortality. Conclusion: Once significant valve dysfunction is first noted, re-operation should be undertaken to minimize operative risk to avoid mortality and post-operative morbidities