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Influence of κ‐rhythm when assessing drowsiness
Author(s) -
SUENAGA KAZUE,
ENDO TAKURO,
OHKI NOBORU
Publication year - 2002
Publication title -
psychiatry and clinical neurosciences
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.609
H-Index - 74
eISSN - 1440-1819
pISSN - 1323-1316
DOI - 10.1046/j.1440-1819.2002.01018.x
Subject(s) - earlobe , rhythm , audiology , kappa , medicine , psychology , mathematics , surgery , geometry
Abstract κ‐Rhythm appears at the highest amplitude on a bipolar T3–T4 derivation and its frequency range is 7–10 Hz. When a contra‐lateral earlobe is used as a reference, the κ‐rhythm causes serious problems in assessing drowsiness. Assessment of drowsiness using contra‐ and ipsi‐lateral earlobes as references in 129 subjects who showed κ‐rhythm was compared. Drowsiness could be assessed properly in only 26% of subjects using the contra‐lateral earlobe and in 90% of subjects using the ipsi‐lateral earlobe. These results suggest that the ear on the ipsi‐lateral earlobe should be used as a reference in subjects who show κ‐rhythm.