Do publicly reported AMI process measures explain the variation in hospital-specific, risk-standardized, 30-day mortality rates in older patients with AMI?
Publicly reported AMI process measures capture only a small proportion (6.0%) of the variation in hospitals' risk-standardized short-term mortality rates, indicating that multiple measures are needed to fully characterize hospital performance.
CONTEXT: The Centers for Medicare hospital-specific, risk-standardized, 30-day mortality rates for AMI patients aged 66 years or older. RESULTS: We found moderately strong correlations (correlation coefficients > or =0.40; P values <.001) for all pairwise comparisons between beta-blocker use at admission and discharge, aspirin use at admission and discharge, and angiotensin-converting enzyme inhibitor use, and weaker, but statistically significant, correlations between these medication measures and smoking cessation counseling and time to reperfusion therapy measures (correlation coefficients <0.40; P values <.001). Some process measures were significantly correlated with risk-standardized, 30-day mortality rates (P values <.001) but together explained only 6.0% of hospital-level variation in risk-standardized, 30-day mortality rates for patients with AMI. CONCLUSIONS: The publicly reported AMI process measures capture a small proportion of the variation in hospitals' risk-standardized short-term mortality rates. Multiple measures that reflect a variety of processes and also outcomes, such as risk-standardized mortality rates, are needed to more fully characterize hospital performance.
Bradley et al. (2006) studied this question.