http://circoutcomes.ahajournals.org/content/10/10/e003748?cpetoc=
Findings From Get With The Guidelines–Stroke
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Abstract
Background—Hospital
profiling is typically undertaken using risk-standardized 30-day
mortality, but obtaining these data for hospitals can be difficult. We
sought to determine whether risk-standardized in-hospital mortality
could serve as an adequate proxy for risk-standardized 30-day mortality
data for the purposes of identifying outlier hospitals.
Methods and Results—Acute
ischemic stroke cases entered into GWTG (Get With The
Guidelines)–Stroke between 2003 and 2013 were linked to fee-for-service
Medicare files to obtain 30-day mortality. Risk-standardized mortality
rates (RSMR) for in-hospital and 30-day mortality were generated using
previously developed risk score models, and the proportion of hospitals
classified as statistical outliers compared. We also assessed the impact
of using the combined outcome of in-hospital mortality or discharge to
hospice. A total of 535 332 ischemic stroke patients from 1494
GWTG–Stroke hospitals were included; mean age was 80 years, 59% female,
and 19% nonwhite. At the hospital level, mean in-hospital RSMRs and
30-day RSMRs were 6.0% and 14.6%, respectively, but the correlation
between the 2 was modest (r=0.53). Overall agreement in the
designation of outlier hospitals between in-hospital and 30-day RSMRs
was 78%, but chance-corrected agreement was only fair (κ=0.29). However,
when using the combined outcome of in-hospital mortality or discharge
to hospice (risk-standardized mean =11.8%), the correlation with 30-day
RSMR was much stronger (r= 0.83) and outlier agreement improved substantially (κ=0.60).
Conclusions—When
used to identify outlier hospitals with high or low mortality, the
agreement between risk-standardized in-hospital mortality and 30-day
mortality was modest. However, the combined outcome of in-hospital
mortality or discharge to hospice showed much better agreement with
30-day mortality. This composite outcome could serve as a proxy for
30-day mortality when used to identify low- or high-performing
hospitals.
- Received March 13, 2017.
- Accepted September 7, 2017.
- © 2017 American Heart Association, Inc.
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