Annals of the American Thoracic Society 2017 02 16() doi 10.1513/AnnalsATS.201611-847OC
Admission to an intensive care unit (ICU) may be beneficial to pneumonia patients with uncertain ICU needs; however, evidence regarding the association between ICU admission and mortality for other common conditions is largely unknown.
To estimate the relationship between ICU admission and outcomes for hospitalized patients with exacerbation of chronic obstructive pulmonary disease (COPD), exacerbation of heart failure (HF), or acute myocardial infarction (AMI).
We performed a retrospective cohort study of all acute care hospitalizations from 2010 to 2012 for U.S. fee-for-service Medicare beneficiaries aged 65 and older admitted with COPD exacerbation, HF exacerbation, or AMI. We used multivariable adjustment and instrumental variable analysis to assess each condition separately. The instrumental variable analysis used differential distance to a high ICU use hospital (defined separately for each condition) as an instrument for ICU admission to examine marginal patients whose likelihood of ICU admission depended on the hospital to which they were admitted. The primary outcome was 30-day mortality. Secondary outcomes included hospital costs.
Among 1,555,798 Medicare beneficiaries with COPD exacerbation, HF exacerbation, or AMI, 486,272 (31%) were admitted to an ICU. The instrumental variable analysis found that ICU admission was not associated with significant differences in 30-day mortality for any condition. ICU admission was associated with significantly greater hospital costs for HF [$11,793 vs. $9,185, P<0.001; absolute increase, 2,608 (95% CI: 1377, 3840)] and AMI [$19,513 vs. $14,590, P<0.001; absolute increase, 4,922 (95% CI: 2665, 7180)], but not for COPD. CONCLUSIONS
ICU admission did not confer a survival benefit for patients with uncertain ICU needs hospitalized with COPD exacerbation, HF exacerbation, or AMI. These findings suggest that the ICU may be overused for some patients with these conditions. Identifying patients most likely to benefit from ICU admission may improve healthcare efficiency while reducing costs.