ZCZY.htm

NR ZCZY

AU Jorgensen,E.O.; Trojaborg,W.

TI 'Visual evoked potentials' og diagnosen af kortikal dod

QU Nordisk Medicin 1971; 86: 1054-1055

PT Letter

AB The diagnosis of cessation of cortical activity cannot be made with certainty by electorencephalography because of the unavoidable presence of extracerebral potentials (4). Therefore, Bachen (1) used the investigation of 'visual evoked potentials' for the diagnosis of cessation of cortical functions had to be based on a differentiation of the 'visual evoked cortical potentials' (VECP) as a test of cortical death. In a previous comment Jorgensen (2) mentioned that the value of 'visual evoked potentials' for the diagnosis of cessation of cortical functions had to be based on a differentiation of the 'visual evoked potentials' from the electroretinogram (ERG), since the ERG was supposed to be present in the occipital leads. However, Bachen (3) states that there is no spreacd of the ERG to the occipital regions. This statement is rejected in the present comment. Recent studies of ERG and VECP after brain death have shown that ERG actually is picked up by occipital electrodes (fig 2). Furthermore, it is possible that the ERG recorded over the occipital area may hide VECP's of low amplitude, especially when fusion of ERG's is induced by stimulation with train of flashes. Literature: 1. Bachen, N.I.: Nord.Med 1970; 84: 1619-1622 2.,) Jorgensen,E.O.: Nord.Med. 1971; 85: 248-249 3.) Bachen, N.I.: Nord.Med. 1971; 85: 627-628 4.) Jorgensen,E.O.; in: Annual report from the Institute of Neurophysiology of the University of Copenhagen 1970, Universitetsforlaget, Copenhagen.

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