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Left coronary ostial stenosis: comparison with left main coronary artery stenosis
H B Barner1, J Reese, J Standeven
1Department of Surgery, St. Louis University Medical Center, Missouri.
Insights
Patients with left main coronary artery stenosis had more comorbidities and poorer left ventricular function than those with left ostial stenosis. Coronary artery bypass grafting outcomes were similar, despite differences in patient profiles.
Area of Science:
- Cardiovascular Surgery
- Interventional Cardiology
- Cardiac Surgery Outcomes
Background:
- Left main coronary artery stenosis and left ostial stenosis are critical conditions affecting coronary blood flow.
- Understanding differences in patient demographics, comorbidities, and surgical outcomes is crucial for treatment strategies.
- Coronary artery bypass grafting (CABG) is a primary treatment for these stenotic conditions.
Purpose of the Study:
- To compare patient characteristics and outcomes following coronary artery bypass grafting (CABG) for left main coronary artery stenosis versus left ostial stenosis.
- To identify significant differences in demographics, prior cardiac events, coronary artery disease extent, and ventricular function between the two groups.
Main Methods:
- A retrospective comparison of 147 patients with left ostial stenosis and 254 patients with left main coronary artery stenosis.
- Patients underwent coronary artery bypass grafting (CABG).
- Data collected included demographics, medical history, coronary anatomy, left ventricular function, and short-term surgical outcomes (mortality, perioperative infarction).
Main Results:
- The left ostial stenosis group had a significantly higher proportion of females (43.5% vs. 12%) and fewer prior myocardial infarctions (36% vs. 53%) compared to the left main group.
- Patients with left main stenosis had more extensive coronary artery disease (2.45 vs. 1.96 diseased vessels) and poorer left ventricular function (2.02 vs. 1.61), with 3% having no other significant coronary disease versus 16% in the ostial group.
- One-month mortality (5.4% vs. 3.9%) and perioperative infarction rates (4.7% vs. 8.6%) were not significantly different between the left ostial and left main stenosis groups, respectively.
Conclusions:
- Left main coronary artery stenosis patients present with more significant comorbidities and worse cardiac function than those with left ostial stenosis.
- Despite these differences, coronary artery bypass grafting (CABG) offers comparable short-term mortality and perioperative infarction rates for both conditions.
- These findings highlight the importance of individualized risk assessment and surgical planning for patients undergoing CABG for left main or ostial coronary stenosis.
Abstract:
We compared 147 consecutive patients who had left coronary ostial stenosis with 254 consecutive patients who had left main coronary artery stenosis treated with coronary artery bypass grafting. Mean age for the left main group was 61.6 years versus 59.7 years for the left ostial group (p = not significant [NS]). In the left ostial group, 43.5% were female and in the left main group, 12% (p less than 0.005). Prior myocardial infarction had occurred in 53% of patients with left main stenosis and 36% of patients with left ostial stenosis (p less than 0.005). There were 2.45 +/- 1.00 diseased vessels in the left main group and 1.96 +/- 1.09 in the left ostial group (p less than 0.0005). Seven (3%) of the patients with left main stenosis had no associated coronary disease (greater than 50%) versus 24 (16%) of the left ostial group (p less than 0.005). The degree of left main stenosis was 90% or more in 28.3% of patients versus 42.8% with equivalent ostial narrowing (p less than 0.01). Left ventricular function was better in the left ostial group than in the left main group (1.61 +/- 0.93 versus 2.02 +/- 1.11, respectively; p less than 0.0005). One-month mortality was 10 patients (3.9%) in the left main group and 8 (5.4%) in the left ostial group (p = NS). Perioperative infarction occurred in 8.6% of patients with left main stenosis and 4.7% of patients with left ostial stenosis (p = NS). Mean follow-up was 6.1 years for the left main group and 5.4 years for the left ostial group.(ABSTRACT TRUNCATED AT 250 WORDS)