Volume-outcome relationships in cardiovascular operations: New York State, 1990-1995.

Area of Science:

• Cardiovascular Surgery
• Health Services Research
• Quality Improvement

Background:

• A persistent inverse relationship between clinical outcomes and procedure volume in cardiovascular operations has been recognized for two decades.
• This volume-outcome relationship highlights potential disparities in patient care quality based on hospital surgical capacity.

Purpose of the Study:

• To investigate the association between hospital procedure volume and in-hospital mortality for three distinct cardiovascular operations.
• Specifically examining coronary artery bypass grafting (CABG), elective repair of abdominal aortic aneurysms (AAA), and repair of congenital cardiac defects (CCD).

Main Methods:

• Analysis of a New York State inpatient database from 1990 to 1995.
• Utilized standard logistic regression to assess the correlation between hospital volume and in-hospital death rates for the selected procedures.

Main Results:

• No significant volume-outcome relationship was observed for coronary artery bypass grafting (CABG) (2.75% mortality).
• A significant inverse relationship between hospital volume and mortality was found for elective abdominal aortic aneurysm (AAA) repair (5.5% mortality).
• A significant inverse relationship between hospital volume and mortality was identified for congenital cardiac defect (CCD) repairs, particularly pronounced in neonates.

Conclusions:

• A notable difference exists in the volume-outcome relationship for AAA and CCD repairs compared to CABG.
• The absence of a volume-outcome relationship for CABG may be attributed to New York State's quality improvement initiatives implemented since 1989.
• Findings suggest the potential for expanding quality improvement programs to other high-risk cardiovascular procedures like AAA and CCD repairs.