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Aortocoronary bypass in patients with severe left ventricular dysfunction
Insights
Aortocoronary bypass grafting improved clinical outcomes in patients with severe left ventricular dysfunction, despite no significant enhancement in resting cardiac function. Most survivors experienced notable symptom relief and improved New York Heart Association class.
Area of Science:
- Cardiology
- Cardiac Surgery
- Cardiovascular Research
Background:
- Severe left ventricular dysfunction (ejection fraction < 35%) presents a significant challenge in cardiac surgery.
- Patients often suffer from severe angina pectoris and advanced heart failure (NYHA Class III/IV).
- Aortocoronary bypass grafting is a potential therapeutic option, but its efficacy in this high-risk group requires careful evaluation.
Purpose of the Study:
- To evaluate the outcomes of aortocoronary bypass grafting in patients with severe left ventricular dysfunction.
- To assess the impact of bypass grafting on clinical status, graft patency, and left ventricular function.
- To determine the perioperative and late mortality rates in this patient cohort.
Main Methods:
- Retrospective study of 29 patients with ejection fraction < 35% undergoing aortocoronary bypass grafting.
- Preoperative intra-aortic balloon pump support was utilized in all cases.
- Follow-up included clinical assessment, New York Heart Association classification, and postoperative cardiac catheterization.
Main Results:
- Operative mortality was 10% (3/29), with 11.5% late mortality.
- Graft patency was high (79%), but resting left ventricular function (ejection fraction, volumes, end-diastolic pressure) showed no significant improvement.
- Despite lack of objective functional improvement, 73% of surviving patients experienced definite clinical improvement, with 55% achieving NYHA Class I/II.
Conclusions:
- Aortocoronary bypass grafting can lead to significant clinical improvement in carefully selected patients with severe left ventricular dysfunction and angina.
- Graft patency does not directly correlate with improvement in resting left ventricular function in this population.
- The procedure offers symptomatic relief and improved quality of life, even without measurable enhancement of global systolic function.
Abstract:
The results of aortocoronary bypass grafting in 29 patients with severe left ventricular dysfunction (ejection fraction less than 35%) were studied. All patients had severe angina pectoris; 17 patients has class IV heart function and 12 had class III function according to the New York Heart Association classification. Intra-aortic balloon pump support was instituted preoperatively in all patients. Three patients died in the perioperative period. Survivors were followed up for a mean period of 20 months; there were three late deaths. Sixteen patients were clinically improved; 8 had class I and 8 class II heart function at follow-up. Fourteen patients underwent cardiac catheterization postoperatively at a mean time of 19 months. Although 22 (79%) of the 28 grafts were patent, there was no significant improvement in resting left ventricular dysfunction as assessed by ejection fraction, left ventricular volume or left ventricular end-diastolic pressure. Furthermore, graft patency could not be correlated with improvement in segmental wall motion. There was a 10% operative and an 11.5% late mortality and no measurable improvement in resting left ventricular function in this study but the majority (73%) of the surviving patients experienced definite clinical improvement.