Clinical practice guidelines are “statements that include recommendations intended to optimize patient care” based on “a systematic review of evidence and an assessment of the benefits and costs of alternative care options” Clinical practice guidelines are valued resources for practitioners, especially in anesthesiology, where providers often work in relative isolation from their peers. Triennial surveys of American Society of Anesthesiologists (Schaumburg, Illinois) members have repeatedly ranked American Society of Anesthesiologists practice parameters as a top benefit of membership.

In this issue of Anesthesiology, Laserna et al. review 2,280 recommendations from 60 clinical practice guidelines published by 26 anesthesia societies in North America and Europe over a 10-year period. They find that half of all recommendations in these guidelines were based on the lowest level of evidence evaluated, typically case reports or consensus...

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