How do major body movements affect sleep stage scoring?

Updated: Aug 19, 2019
  • Author: Andres A Gonzalez, MD, MMM, FACNS; Chief Editor: Selim R Benbadis, MD  more...
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At times, movement and muscle artifact obscures the EEG for more than half the epoch such that the stage cannot be determined. In such cases, the epoch is scored as Stage W when alpha rhythm is present for any part of the epoch. Epochs with a major body movement, but no discernable alpha rhythm, that precede or follow an epoch of stage W are scored as stage W. If neither criteria can be met the epoch is scored as the same stage as the epoch that follows it.

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