Effective ambulatory anesthesia is based on a predictable pattern of recovery. This, of course, varies with the agent used, the inherent differences in how patients metabolize or detoxify a drug, as well as the duration and dosage of the drug administered. The development of a straightforward objective test to measure recovery accurately was undertaken in an effort to provide reliable and reproducible data.

Other methods of measuring psychomotor performance have been used. These include testing special sensory functions such as vision and hearing, various verbal, drawing and bead threading parameters, as well as the use of a complex reaction timer developed by the American Automobile Association. Other studies of recovery from methohexital anesthesia have involved measuring waking time, the ability to speak rationally and coherently, as well as the use of a driving simulator. Porteus mazes and ‘“draw a person test” have also been proposed....

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