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Effect of coronary artery bypass grafting on subsequent hospitalization
Insights
Surgical treatment significantly reduced cardiovascular hospitalizations by 26% compared to medical management. This included fewer myocardial infarctions and other cardiovascular events, though chest pain hospitalizations were similar.
Area of Science:
- Cardiology
- Cardiovascular Surgery
- Health Services Research
Background:
- Coronary artery disease management involves medical and surgical options.
- Comparing long-term outcomes is crucial for treatment decisions.
- Patient matching is essential for valid comparative studies.
Purpose of the Study:
- To compare hospitalization rates between medically and surgically treated patients.
- To identify specific reasons for hospitalization differences.
- To evaluate the impact of surgical intervention on cardiovascular events.
Main Methods:
- Matched-pair cohort study using the Seattle Heart Watch Angiography Registry.
- Patients matched on disease extent, ejection fraction, age, and survival predictors.
- Comparison of annual hospitalization rates for cardiovascular events.
Main Results:
- Surgical patients had a 26% lower overall cardiovascular hospitalization rate (19%/year vs. 26%/year).
- Significant reductions in myocardial infarction (MI) and other cardiovascular hospitalizations were observed in surgical patients.
- No significant difference in hospitalization for non-MI chest pain; overall MI rates were similar when including perioperative MIs.
Conclusions:
- Surgical treatment for coronary artery disease is associated with reduced cardiovascular hospitalizations.
- The benefits include fewer MIs and other cardiovascular events.
- Hospitalization for non-MI chest pain and overall MI rates did not significantly differ between groups.
Abstract:
The rates of hospitalization during follow-up for a matched pair cohort of medically and surgically treated patients from the Angiography Registry of Seattle Heart Watch were compared. Medically and surgically treated patients were matched according to extent of disease, left ventricular ejection fraction, age, and 3 other survival rate-related characteristics. There was a 26% reduction in cardiovascular hospitalizations in the surgically treated patients (19%/year) compared with the medically treated patients (26%/year). This was due to a significant reduction in hospitalization rate for myocardial infarction (surgically treated patients 1.1%/year, medically treated patients 2.6%/year), and for other cardiovascular reasons (surgically treated patients 12.5%/year, medically treated patients 15.7%/year). No significant (p = 0.146) reduction occurred in hospitalization rate for chest pain not due to myocardial infarction (surgically treated patients 5.6%/year, medically treated patients 7.7%/year). When the perioperative infarctions are included for the surgical cohort, the overall myocardial infarction rate is not significantly different (p = 0.173) between the 2 treatment groups (surgically treated patients 1.9%/year, medically treated patients 2.6%/year). Acute myocardial infarction was an uncommon reason for hospitalization, accounting for only 8% (55 of 685) of all cardiovascular hospitalizations, and was not related to the number of stenotic vessels in medically treated patients.