“…In this study plus four others (Branthwaite, 1972(Branthwaite, , 1973Casteneda et al, 1974;Stockard et al, 1974), seizures occurred in 21 of 900 patients. Suggested causes of neurologic deficits of any kind after cardiac surgery have included age (Tufo et al, 1970;Branthwaite, 1973;Stockard et al, 1973), atherosclerosis (Branthwaite, 1973;Stockard et al, 1973;Bojar et al, 1983), perfusion duration (Tufo et al, 1970;Branthwaite, 1973;Aberg and Kihlgren, 1977), toxins (Dobell et al, 1966;Stockard et al, 1974), metabolic changes (Fischer-Williams and Cooper, 1964), alveolar collapse (Fischer-Williams and Cooper, 1964), use of all blood primers (Branthwaite, 1973), emboli whether due to atheromata or air (Brierley, 1964;Aberg and Kihlgren, 1977;Bojar et al, 1983), and hypotension with or without decreased cardiac output (Brierley, 1964;Fischer-Williams and Cooper, 1964;Tufo et al, 1970;Castaneda et al, 1974;Bojar et al, 1983;Breuer et al, 1983).…”