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Valve reoperations--identification of risk factors and comparison with first-time operations
J T Christenson1, V Velebit, J Maurice
1Cardiovascular Unit, Hôpital de la Tour, Meyrin-Geneva, Switzerland.
Insights
Reoperations for heart valve surgery carry a slightly higher perioperative mortality (6.4%) compared to first-time operations (4.4%). Risk factors like age, urgency, and multiple valve repairs significantly impact reoperation mortality.
Area of Science:
- Cardiovascular Surgery
- Cardiac Anesthesia
- Thoracic Surgery
Background:
- Reoperations for heart valve surgery present unique challenges compared to primary procedures.
- Understanding risk factors for perioperative mortality in redo cardiac surgery is crucial for patient management.
Purpose of the Study:
- To analyze risk factors influencing perioperative mortality in patients undergoing heart valve reoperations.
- To compare perioperative mortality and risk factors between first-time heart valve operations and reoperations.
Main Methods:
- Retrospective analysis of 47 patients undergoing heart valve reoperations (Group I) and 203 patients undergoing first-time operations (Group II).
- Comparison of demographic data, preoperative conditions, surgical variables, and perioperative mortality between the two groups.
- Identification of risk factors associated with mortality in reoperation patients.
Main Results:
- Reoperation patients (Group I) were younger but had higher rates of hypertension, hyperlipidemia, diabetes, and were more often in NYHA class III/IV and required emergency surgery.
- Overall perioperative mortality was 6.4% for reoperations versus 4.4% for first-time operations (not significant).
- Mortality increased significantly with the number of reoperations (5.0% for first reoperation, 14.3% for second or more) and was higher for emergency (20%) versus elective (4.8%) and multiple valve procedures (25%) versus single valve (2.6%).
Conclusions:
- While overall mortality is similar, specific subgroups of patients undergoing heart valve reoperations face significantly higher risks.
- Urgency of operation, number of reoperations, and extent of valve repair/replacement are critical determinants of mortality in redo cardiac surgery.
- Preoperative patient condition and surgical complexity are key factors to consider in managing patients requiring repeat heart valve surgery.
Abstract:
Fourty-seven patients with a least one heart valve operation each who underwent reoperations (Gr. I) were analyzed with special regard to risk factors influencing the perioperative mortality and compared to 203 patients operated for the first time (Gr. II) during the same time period. Mean age was 57.1 years in Gr. I and 64.1 years in Gr. II (p < 0.05). There were no differences between the groups with regard to sex, smoking, obesity, or concomitant peripheral vascular disease. Hypertension, hyperlipidemia, and diabetes were more frequently seen in Gr. I, p < 0.05. A significantly higher number of patients in the redo group (Gr. I) belonged preoperatively to NYHA class III or IV, p < 0.001 and needed emergency surgery more often, p < 0.01, but left-ventricular function did not differ between the groups. There was no significant difference in the position of valves operated or the number of multiple valve replacements/repairs between the groups, and no difference in aortic cross-clamping or cardiopulmonary bypass time. Most patients were referred from other hospitals. Overall perioperative mortality for Gr. I was 6.4% and Gr. II 4.4% (n.s.). Mortality after first reoperation was 5.0%, after second or more 14.3%. Perioperative mortality was related to age, preoperative NYHA class, and urgency of operation in both groups, and to multiple valve replacement/repair in Gr. I. Elective reoperation carried a mortality of 4.8% but emergency reoperation 20%; reoperation mortality was 2.6% for single valves and 25% for multiple valves.(ABSTRACT TRUNCATED AT 250 WORDS)