Abstract
OBJECTİVE: To investigate the bispectral index values of normal sleep
stages PATİENTS and METHOD: Simultaneous polysomnography and bispectral
index recordings of 21 patients who underwent polysomnography for
diagnosis of obstructive sleep apnea were analyzed for determining the
BIS values of normal sleep stages. RESULTS: BIS values are found
sensitive in reflecting the various stages of natural sleep except for
REM and stage N2. REM and stage N2 BIS values were close to each other.
CONCLUSION: BIS is sensitive for the evaluation of the stages of natural
sleep and BIS values decreases as the sleep stages becomes deeper