The Electroencephalogram in

NEUROLOGICAL complications of congenital heart diseases have been well documented by Tyler and Clark.¹,²According to these authors, neurological deficits were detectable in 25.4%, blackout spells in 12.1% and convulsions in 5.8%. These investigations did not include electroencephalographic data. Thus far, a fair number of EEG studies has been carried out³⁻⁷; the principal EEG data are summarized in Table 1. In all of these studies, there was marked preponderance of abnormal EEG tracings. Nonspecific EEG findings (such as excessive slow activity) were most commonly reported with exception of the investigations of Shev and Robinson⁶as well as Bekény et al⁷who noted the relatively high incidence of paroxysmal abnormalities (such as spikes). The scarcity of previous reports and the interesting aspects of the central nervous system (CNS) dependency on adequate oxygenation have been the incentive for this study. Materials and Methods A total of