Back to Clinical systemsInion-Cz use in infants
Posted on 07/17/07 20:55:08
Number of posts: 4
Posted: Thu Nov 24, 2005 11:45 am Post subject: Inion-Cz use in infants
A study by van der Reijden and colleagues published in Ear and Hearing this year ("EEG derivations providing ASSRs with High SNRs in Infants") suggests that the inion-Cz placements result in very low SNRs. Does anyone have any thoughts why this result may have occured in such contrast with other studies who have used the inion-Cz positions in infants successfully?
A study by van der Reijden and colleagues published in Ear and Hearing this year ("EEG derivations providing ASSRs with High SNRs in Infants") suggests that the inion-Cz placements result in very low SNRs. Does anyone have any thoughts why this result may have occured in such contrast with other studies who have used the inion-Cz positions in infants successfully?
Replies:
from sasha9
Posted on 07/17/07 20:57:24
Number of posts:
PostPosted: Wed Dec 21, 2005 12:30 am��� Post subject: electrode positions
The study didn't say Cz-inion was bad...just that it was not as good as lateralized electrode positions. In adults the dipole from brainstem is maximal at Cz, while in infants it seems to be lateralized...this can be a developmental change in the brainstem nuclei which are generating the response or possibly a different proportion of the generators are responding..but it is likely the prior explanation....the study offers some evidence that it might be useful to rely upon 2 electrodes when testing both ears and evaluating the response to each ear only in one electrode.
The study didn't say Cz-inion was bad...just that it was not as good as lateralized electrode positions. In adults the dipole from brainstem is maximal at Cz, while in infants it seems to be lateralized...this can be a developmental change in the brainstem nuclei which are generating the response or possibly a different proportion of the generators are responding..but it is likely the prior explanation....the study offers some evidence that it might be useful to rely upon 2 electrodes when testing both ears and evaluating the response to each ear only in one electrode.
Nape vs linked mastoid
Posted on 07/17/07 21:00:02
Number of posts: 4
Posted: Thu Jan 12, 2006 3:46 pm Post subject: Nape vs linked mastoid
We've found when using the nape electrode with newborns that frequently the ECG is picked up, preventing the setting of artefact rejection levels as low as we would like. As an alternative we have been using linked mastoids. We haven't made a formal comparison with the nape but have found that the linked mastoid works well without the ECG appearing in the response. Has anyone else used the linked mastoid electrode position and if so how have you found it compared with other electrode positions?
We've found when using the nape electrode with newborns that frequently the ECG is picked up, preventing the setting of artefact rejection levels as low as we would like. As an alternative we have been using linked mastoids. We haven't made a formal comparison with the nape but have found that the linked mastoid works well without the ECG appearing in the response. Has anyone else used the linked mastoid electrode position and if so how have you found it compared with other electrode positions?
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