Abstract:
:The predictive validity of evoked potentials (EPs) and event-related potentials (ERPs) in multiple sclerosis (MS) has not yet been fully investigated, as only the sensitivity of these tests has sofar been reported. EPs (short, middle and long latency auditory evoked potentials and visual evoked potentials) and ERPs (visual and auditory) were studied in 19 controls and 30 multiple sclerosis (MS) patients. Abnormality thresholds of peak latencies were defined on the basis of the mean plus 2 or 3 standard deviations, based on data from the control group. The effects of changing the latency thresholds and including the absence of peaks in the abnormality definition were assessed. In accordance with earlier reports we found a high sensitivity (up to 93% for bimodal combined EPs and 47% for combined ERPs). False positive rates of separate peaks were low and conformed to expectation. However, combining separate peak measurements increased false positive rates of EPs and ERPs to unacceptably high levels (up to 58% for combined EPs and 32% for combined ERPs). Positive likelihood ratios for bimodal EPs were low (between 1.6 and 4.0, depending on the abnormality definition). They ranged from 1.4 to 2.2 for bimodal ERPs. Abnormal combined EPs or ERPs were therefore not the reliable indicators of functional damage that they are supposed to be. Separate EPs were much more reliable in this respect. ERPs failed to distinguish between the groups, either separately or in combination. Changing the latency threshold and including absent peaks in the abnormality definition influenced the abnormality rates in both groups.(ABSTRACT TRUNCATED AT 250 WORDS)
journal_name
J Neurol Scijournal_title
Journal of the neurological sciencesauthors
van Dijk JG,Jennekens-Schinkel A,Caekebeke JF,Singh A,Zwinderman AHdoi
10.1016/0022-510x(92)90087-2subject
Has Abstractpub_date
1992-05-01 00:00:00pages
11-7issue
1eissn
0022-510Xissn
1878-5883pii
0022-510X(92)90087-2journal_volume
109pub_type
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journal_title:Journal of the neurological sciences
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