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Left ventricular function and coronary artery disease progression early after coronary bypass grafting
D Tousoulis1, G Davies, T Crake
1Cardiothoracic Unit, Royal Postgraduate Medical School, Hammersmith Hospital, London, England.
Insights
Coronary artery disease progression after bypass grafting did not impact left ventricular function. Graft occlusion did not alter left ventricular ejection fraction in patients experiencing angina post-surgery.
Area of Science:
- Cardiology
- Cardiovascular Surgery
- Medical Imaging
Background:
- Early angina after coronary artery bypass grafting (CABG) may indicate disease progression.
- Assessing left ventricular (LV) function is crucial for managing patients post-CABG.
Purpose of the Study:
- To investigate the impact of coronary artery disease (CAD) progression on LV function in patients with early post-CABG angina.
- To evaluate the relationship between graft patency, CAD progression, and LV function.
Main Methods:
- Retrospective analysis of 34 patients undergoing repeat angiography post-CABG.
- Quantitative assessment of coronary stenosis, graft occlusion, and LV ejection fraction (LVEF).
- Comparison of LVEF before and after CABG in patients with patent grafts versus occluded grafts.
Main Results:
- Coronary artery disease progression was observed in both groups (patent and occluded grafts).
- No significant change in global or regional left ventricular ejection fraction was found in either group.
- Graft occlusion did not correlate with altered left ventricular function post-CABG.
Conclusions:
- Coronary artery disease progression and graft occlusion do not significantly affect left ventricular function in the early post-CABG period for patients with angina.
- Left ventricular ejection fraction remains stable despite disease progression and graft issues in this cohort.
Abstract:
To investigate the effects of coronary artery disease progression on left ventricular function in patients who suffer angina early after coronary artery bypass grafting, we studied the progression of coronary stenoses, the occurrence of graft occlusions, and measured left ventricular ejection fraction (regional and global) in 34 consecutive patients who underwent repeat angiography 25.2 +/- 3.5 (standard error of the mean) months postoperatively, from a total population of 550 patients who underwent bypass grafting. Resting left ventricular function and stenosis severity were assessed using a computerized, quantitative analysis system. Coronary stenosis progression was defined as an increase in the percentage of the stenotic occlusion by 30% or more, any increase in lesion severity that resulted in total coronary artery occlusion, or the occurrence of a new stenosis that occluded the artery by 50% or more. Group 1 comprised 21 patients with all grafts patent and group 2 comprised 13 patients with one or more grafts occluded (20 of 34 grafts). Coronary artery disease progressed in all patients in group 1, and this involved 22 of 54 (41%) grafted vessels and 3 of 15 (20%) nongrafted vessels (p < 0.05). Coronary artery disease progressed in 11 patients in group 2, involving 15 of 32 (47%) grafted vessels and 1 of 6 (17%) nongrafted vessels (p < 0.01). An increased collateral circulation was observed in both groups. The left ventricular ejection fraction remained unchanged in both groups (group 1, 0.60 +/- 0.03 versus 0.62 +/- 0.03; group 2, 0.62 +/- 0.05 versus 0.62 +/- 0.04 before and after bypass, respectively; p = not significant) and there was no difference between the groups.(ABSTRACT TRUNCATED AT 250 WORDS)