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A modified method for estimating volume-outcome relationships: application to percutaneous coronary intervention
Yang Xie1, John A Rizzo, David L Brown
1Division of Clinical and Administrative Pharmacy, College of Pharmacy, University of Iowa, USA.
Journal of Medical Economics
|May 20, 2009
Summary
A new method for measuring cardiologist and peer volumes in percutaneous coronary intervention (PCI) better predicts adverse outcomes. This approach refines volume-outcome relationships compared to conventional methods.
Area of Science:
- Cardiovascular Medicine
- Health Services Research
- Medical Statistics
Background:
- Assessing the relationship between procedure volume and patient outcomes is crucial for quality improvement in healthcare.
- Traditional methods of measuring operator and hospital volumes for percutaneous coronary intervention (PCI) may not accurately reflect individual performance or its impact on mortality.
- Previous studies have explored volume-outcome relationships, but a refined measurement approach is needed.
Purpose of the Study:
- To propose and validate an alternative method for calculating individual operator and peer volumes in PCI.
- To evaluate whether this modified volume measurement can serve as a more precise predictor of in-hospital mortality compared to conventional methods.
- To investigate the volume-outcome relationship for PCI procedures in New York State.
Main Methods:
- A retrospective analysis of PCI procedures performed in New York State between 1996 and 1999.
- A modified method for calculating physician volume using the previous year's data.
- Hospital volume calculated by subtracting the individual operator's volume from the total hospital volume.
- Comparison of in-hospital mortality rates based on different volume measurement approaches.
Main Results:
- The modified method showed a significant reduction in in-hospital mortality for cardiologists performing 75-174 PCI procedures annually (OR 0.74, p=0.04).
- No significant relationship between cardiologist volume and mortality was found using the conventional measurement approach.
- Reduced mortality odds were observed for patients treated in hospitals with higher peer volumes (600-999 or >=1,000 cases).
- The conventional method failed to detect a significant correlation between hospital volume and in-hospital mortality.
Conclusions:
- The proposed alternative method for measuring cardiologist and peer volumes provides more precise estimates of volume-outcome relationships in PCI.
- This refined approach offers a better tool for identifying factors associated with improved patient outcomes.
- The findings highlight the importance of accurate volume measurement in quality assessment for interventional cardiology.
