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[Effect of the degree of revascularization on left ventricular function after aortocoronary bypass operation]
A Machraoui1, H C Purucker, D Jäger
1Abteilung für Kardiologie und Angiologic, Berufsgenossenschaftliche Kliniken Bergmannsheil Bochum-Universitätsklinik.
Insights
Achieving 50% or more myocardial revascularisation through coronary bypass surgery significantly improves left ventricular function. This quantitative assessment guides surgical success in patients with coronary artery disease.
Area of Science:
- Cardiovascular Surgery
- Cardiac Physiology
- Interventional Cardiology
Context:
- Quantitative evaluation of myocardial revascularisation extent is crucial for assessing surgical outcomes.
- Left ventricular function analysis before and after aortocoronary bypass surgery provides insights into treatment efficacy.
- Coronary artery disease severity and revascularisation grade influence post-operative cardiac performance.
Purpose:
- To analyze the effect of coronary bypass surgery on left ventricular function.
- To establish precise criteria for quantitatively evaluating the extent of myocardial revascularisation.
- To correlate the grade of revascularisation and pre-operative ejection fraction with post-operative cardiac performance.
Summary:
- A retrospective study analyzed 161 patients undergoing coronary bypass surgery, assessing left ventricular function via Swan-Ganz catheterization.
- Patients were categorized by revascularisation grade (RG) and ejection fraction (EF). Changes in pulmonary capillary wedge pressure and cardiac index on exercise were measured.
- Significant improvements in left ventricular function, indicated by reduced pulmonary capillary wedge pressure and increased cardiac index, were observed with revascularisation grades of 50% and above.
Impact:
- Establishes a quantitative threshold (50% revascularisation) for predicting adequate improvement in left ventricular function post-coronary bypass.
- Provides a framework for evaluating the success of myocardial revascularisation based on objective physiological measures.
- Informs clinical decision-making regarding the extent of revascularisation required for optimal patient outcomes in coronary artery disease.
Background:
The extent of myocardial revascularisation by aortocoronary bypass surgery can only be quantitatively evaluated by using precise criteria. In this retrospective study the effect of coronary surgery on left ventricular function was analyzed.
Patients And Methods:
In 161 patients, 148 male and 13 female, aged 52.5 +/- 7.0 years (33 to 69 years) with 1 (7%), 2 (38%) or 3 vessel disease (55%) the left ventricular function was analyzed by Swan-Ganz catheterization at rest and on exercise, five months before and after coronary bypass operation. Coronary artery and bypass lesions were quantified according to a new detailed score including diseased main or side branches, segment 1 to 3, type of irrigation and area reduction of the artery cross-section. Pulmonary capillary wedge pressure and cardiac index were measured and related to the grade of revascularisation (RG) and pre-operative ejection fraction (EF), classified in the groups RG1 < 50%, n = 54; RG2 50 to 74%, n = 52; RG3 > or = 75%, n = 55, EF1 < 60%, n = 30 and EF2 > or = 60%, n = 129.
Results:
The change in pulmonary capillary wedge pressure on exercise was in RG1, RG2 and RG3 -26.2%, -29.0% and -40.9%, respectively (p < 0.001). It was significantly higher in RG2 and RG3 than in RG1. The increase in cardiac index on exercise was significant only in groups RG2, RG3 and EF2 (p < 0.005).
Conclusion:
Adequate improvement of left ventricular function can be expected when a grade of revascularisation of 50% and more is achieved.