PMID: 11374615May 26, 2001Paper

BIS monitoring to prevent awareness during general anesthesia

Anesthesiology
M F O'ConnorJ Apfelbaum

Abstract

Unexpected awareness is a rare but well-described complication of general anesthesia that has received increased scientific and media attention in the past few years. Transformed electroencephalogram monitors, such as the Bispectral Index monitor, have been advocated as tools to prevent unexpected recall. The authors conducted a power analysis to estimate how many patients would be needed in an appropriately powered study to demonstrate the Bispectral Index monitor reduces awareness, as well as a cost analysis to assess the cost of using the monitor for this purpose alone. If unexpected recall is rare (1 in 20,000), it will require a large study to demonstrate that the monitor reduces awareness (200,000-800,000 patients), and the cost of using it for this purpose alone would be high ($400,000 per case prevented). If awareness is common (1 in 100), then the number of patients needed in a study to demonstrate that the monitor works becomes tractable (1,000-4,000 patients), and the cost of using the monitor for this purpose alone becomes lower ($2,000 per case prevented). Because there are reported cases of awareness despite Bispectral Index monitoring, the authors are certain that the effectiveness of the monitor is less than 100...Continue Reading

References

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Citations

Jan 23, 2008·Der Anaesthesist·G N SchmidtP Bischoff
Aug 21, 2013·Annales Françaises D'anesthèsie Et De Rèanimation·S NeboutR Pirracchio
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