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Is reoperative coronary artery bypass grafting in patients with poor left ventricular ejection fractions < or = 25%
J T Christenson1, A Bloch, J Maurice
1Cardiovascular Surgery Unit, Hôpital de la Tour, Meyrin-Geneva, Switzerland.
Insights
Patients with very low left ventricular ejection fraction (LVEF) can benefit from reoperative coronary artery bypass grafting (CABG). Careful patient selection is crucial due to increased operative risk, but outcomes show significant improvement in LVEF and angina symptoms.
Area of Science:
- Cardiovascular Surgery
- Cardiac Surgery Outcomes
- Coronary Artery Disease Management
Background:
- Reoperative coronary artery bypass grafting (CABG) is complex, especially in patients with severely impaired left ventricular ejection fraction (LVEF).
- Limited data exists on the efficacy and safety of reoperative CABG for patients with LVEF ≤ 25%.
Purpose of the Study:
- To evaluate the outcomes of reoperative CABG in patients with very low LVEF (≤ 25%).
- To determine if these patients should be considered for reoperative CABG despite elevated risks.
Main Methods:
- Retrospective analysis of 1681 primary CABG and 308 reoperative CABG patients from January 1990 to December 1993.
- Comparison of outcomes between primary CABG (Group I) and reoperative CABG (Group II) in 108 patients with LVEF ≤ 25%.
- Assessment of preoperative risk factors, intraoperative data, postoperative complications, and long-term follow-up including New York Heart Association (NYHA) class and LVEF.
Main Results:
- Reoperative CABG (Group II) had a significantly higher postoperative mortality (23.5%) compared to primary CABG (Group I; 12.1%).
- Incidence of non-fatal myocardial infarction and most postoperative complications did not differ, except for transient renal failure, which was higher in Group II.
- Significant improvements in NYHA class (3.5 to 1.8) and LVEF (21% to 45%) were observed in both groups after 18 months, with mitral regurgitation resolving in all patients.
Conclusions:
- Patients with LVEF ≤ 25%, angina, and significant coronary artery disease should not be refused reoperative CABG.
- Careful patient selection is essential due to the increased operative risk associated with reoperative CABG in this cohort.
- Reoperative CABG can lead to significant functional improvement in carefully selected patients with severely reduced LVEF.
Aim:
This study aimed to investigate whether patients with very low left ventricular ejection fractions (LVEF) should be accepted for reoperative coronary artery bypass grafting (CABG).
Study Population:
Between January 1990 and December 1993, 1681 patients underwent primary CABG and 308 (15.5%) reoperative CABG. One hundred and eight patients (5.4%) had an LVEF < or = 25%, 91 patients for primary CAGB (group I) and 17 for CABG (group II). The mean age of the patients was 62 years. Sex distribution and preoperative risk factors did not differ. Urgent operations were more frequently necessary in group II (P < 0.01). Mitral regurgitation was present in 49% of the group I patients and 18% of the group II patients (P < 0.05). Pulmonary artery hypertension was observed in 24% of group I patients, but in only 6% in group II patients. The mean LVEF was 21% and left ventricular end-diastolic pressure 18 mmHg, without between-group differences. All patients had significant two- or three-vessel disease (stenosis > or = 70%). An average of 4.5 grafts per patient were performed. Mitral valve surgery was not performed in any of the patients.
Results:
The postoperative mortality was significantly higher in reoperative CABG patients (group II; 23.5%) than in group I patients (12.1%; P < 0.05), whereas the incidence of non-fatal myocardial infarction did not differ. The incidence of postoperative complications did not differ between the groups, except for transient renal failure, more frequently encountered in group II (P < 0.05). After an average follow-up of 18 months, the New York Heart Association (NYHA) class and the LVEF were significantly improved in both groups (NYHA class from 3.5 to 1.8 and LVEF from 21% to 45%; P < 0.001). The mitral regurgitation had improved or completely disappeared at the end of follow-up in all patients in both groups.
Conclusions:
Our results suggest that patients with left ventricular ejection fraction < or = 25%, angina and significant two- or three-vessel coronary artery disease should not categorically be refused for reoperative CABG. Careful patient selection is necessary because of an increased operative risk.