Sympathetic surge during subconvulsive and convulsive bifrontal stimulation. The figure shows ECT no. 4 in a 66-year-old male patient. Stimulus electrodes had been placed at a distance of 6 cm, that is, a distance of 10 cm between the midpoints. Arrows indicate the onset of tachycardia. The first stimulation (203 mC, 7.5 s, 30 Hz, 0.50 ms) was followed by neither motor nor EEG seizure signs. The subsequent stimulation (280 mC, 7.7 s, 40 Hz, 0.50 ms) led to a seizure of 60-s duration.