1. Influence of kappa-rhythm when assessing drowsiness
- Author
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Takuro Endo, Noboru Ohki, and Kazue Suenaga
- Subjects
Adult ,Male ,medicine.medical_specialty ,Electroencephalography ,Audiology ,Rhythm ,medicine ,Humans ,Earlobe ,Aged ,medicine.diagnostic_test ,General Neuroscience ,General Medicine ,Middle Aged ,body regions ,Psychiatry and Mental health ,medicine.anatomical_structure ,Neurology ,Anesthesia ,Female ,Sleep Stages ,Neurology (clinical) ,Sleep ,Psychology ,Kappa - Abstract
Kappa-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 kappa-rhythm causes serious problems in assessing drowsiness. Assessment of drowsiness using contra- and ipsi-lateral earlobes as references in 129 subjects who showed kappa-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 kappa-rhythm.
- Published
- 2002
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