 A detailed study comparing flurothyl and ECT in patients with severe endogenous depression, reported the degree of anterograde amnesia to be similar, but the degree of retrograde amnesia was much lower after flurothyl.Psychological tests showed memory impairments at the fourth week of treatment, and memory improvement two weeks after the last treatment, with no measurable differences between the treatments.Equal degrees of EEG slow wave increases were recorded in flurothyl and electrical induced seizures.