Hemispheric predominance of abnormal findings in electroencephalogram (EEG).
The EEGs of 13,560 patients have been reviewed in order to determine whether abnormal findings, epileptiform or not, have a hemispheric dominance. We have included outpatients and hospitalized patients as well. Eight hundred and thirty-five EEGs had generalized abnormal findings, and 414 EEGs had lateralized abnormal findings. The EEGs of 322 patients (77.7%) had a left predominance, and those of 92 patients (22.3%) had a right predominance, of abnormal findings. A strong left predominance has been noted for the epileptiform discharges, i.e. 128 (79%) vs. 34 (21%). These results raise the possibility that the left hemisphere may be more vulnerable to nosological processes.
Gatzonis
S D
SD
Department of Neurology, Athens Medical School, Eginition Hospital, Athens, Greece. sgatzon@med.uoa.gr
Roupakiotis
S
S
Kambayianni
E
E
Politi
A
A
Triantafyllou
N
N
Mantouvalos
V
V
Chioni
A
A
Zournas
Ch
Ch
Siafakas
A
A
D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D001921:Brain / Q000503:physiopathology*; D004569:Electroencephalography; D004827:Epilepsy / Q000175:diagnosis / Q000503:physiopathology*; D005260:Female; D007839:Functional Laterality / Q000502:physiology*; D006801:Humans; D008297:Male; D008875:Middle Aged; D012189:Retrospective Studies