Bispectral index

BIS monitor for an awake person

The bispectral index (BIS) is a measured value used to objectify the depth of anesthesia . A dimensionless numerical value between 0 and 100 is calculated on the basis of an EEG . The lower the value, the deeper the anesthetic. The aim is to avoid intraoperative alertness .

history

Aspect Medical Systems presented the BIS in 1994. In 2003 the method was approved by the American Food and Drug Administration .

function

A BIS monitor

The aim of the elevation of the BIS is that the anesthetist the depth of anesthesia by adjusting the dose of narcotics can be controlled better. To do this, several electrodes are placed on the patient's forehead. The algorithm for calculating the BIS is not available to the public. It is known that the value is calculated from several parameters of the EEG that are related to wakefulness. Possible falsifications can occur through movements, incorrect electrode positions and surgical instruments.

commitment

The BIS can be used during operations , in intensive care units and during intensive care transports. However, it is not collected as a standard for every operation. There are no fixed guidelines that regulate the use. There is also a discussion about whether the BIS can really be better used to prevent intraoperative alertness.

Individual evidence

↑ ^a ^b Jeffrey C. Sigl, Nassib G. Chamoun: An introduction to bispectral analysis for the electroencephalogram . In: Journal of Clinical Monitoring . tape 10 , no. 6 , November 1994, ISSN 0748-1977 , p. 392–404 , doi : 10.1007 / BF01618421 ( springer.com [accessed November 9, 2019]).
↑ ^a ^b Deutscher Ärzteverlag GmbH, editorial office of the Deutsches Ärzteblatt: bispectral index cannot detect “wakefulness in anesthesia”. August 18, 2011, accessed November 9, 2019 .

[:0-1] Jeffrey C. Sigl, Nassib G. Chamoun: An introduction to bispectral analysis for the electroencephalogram . In: Journal of Clinical Monitoring . tape 10 , no. 6 , November 1994, ISSN 0748-1977 , p. 392–404 , doi : 10.1007 / BF01618421 ( springer.com [accessed November 9, 2019]).

[:1-2] Deutscher Ärzteverlag GmbH, editorial office of the Deutsches Ärzteblatt: bispectral index cannot detect “wakefulness in anesthesia”. August 18, 2011, accessed November 9, 2019 .