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The Empirical Basis for Determinations of Medical Futility

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Abstract

BACKGROUND

Decisions to limit treatment in critically ill patients often rely on publications that make claims of futility based on outcome data. Our objective was to systematically review the criteria for futility and the strength of empirical evidence across clinical studies that purport to support or refute claims of futility.

METHODS

The MEDLINE database was searched for relevant articles published between1980 and 2008. Selected studies reported original outcome data in critically ill or cardiac arrest patients and claimed that these data can support or refute decisions to limit treatment in comparable patients. Two authors independently abstracted data on patient characteristics, intervention, outcomes, cost, and design.

RESULTS

Forty seven studies supporting a claim of futility and 45 refuting it were reviewed. Median point estimate for adverse outcome in studies supporting claims of futility was 100% (range 75% to 100%); median lower 95% confidence limit was 91% (range 48% to 99%). Explicit thresholds for futility were missing in 88% of articles. The original criteria for quantitative futility were fulfilled by only 28% of data, and almost exclusively in studies of cardiopulmonary resuscitation (CPR) for cardiac arrest. Substantial statistical overlap was observed between data brought in support of futility claims and data brought to refute them.

CONCLUSIONS

Most studies that purport to guide determinations of futility are based on insufficient data to provide statistical confidence for clinical decision-making. They usually lack explicit a priori thresholds for determination of futility. Many studies draw disparate conclusions based on statistically similar data. In most circumstances these problems preclude confident determinations of futility.

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Acknowledgement

This work was done with the support of the Clinical and Translational Science Center, Tufts Medical Center. Grant number: NIH/NCRR 1UL1 RR025752

Conflict of Interest

In the last 3 years, Dr. Kent consulted for Eli Lilly and received research funding from Pfizer.

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Correspondence to Ezra Gabbay MD.

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Gabbay, E., Calvo-Broce, J., Meyer, K.B. et al. The Empirical Basis for Determinations of Medical Futility. J GEN INTERN MED 25, 1083–1089 (2010). https://doi.org/10.1007/s11606-010-1445-3

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  • DOI: https://doi.org/10.1007/s11606-010-1445-3

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