Electroencephalographic study in acute rheumatic carditis.
Electroencephalographic studies were done in rheumatic fever patients in order to determine the distribution of normal and abnormal EEG patterns in different clinical forms. The duration of EEG abnormalities related to rheumatic activity was compared with the duration of increased sedimentation rate and tachycardia. Rheumatic fever cases were divided into four groups: (1) acute active rheumatic carditis, (2) acute polyarthritis without carditis, (3) nonactive old rheumatic valvular heart disease, and (4) Sydenham's chorea. EEG findings were within normal limits in acute polyarthritis and in nonactive rheumatic valvular heart disease, but there were abnormal EEG findings in 29 per cent of chorea and in 94 per cent of active carditis cases. In active carditis all EEG changes returned to normal approximately within 8 weeks, whereas the sedimentation rate and tachycardia returned to normal within a shorter period.