Indian Journal of PsychiatryIndian Journal of Psychiatry
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ARTICLE
Year : 1998  |  Volume : 40  |  Issue : 1  |  Page : 55-59

Limitations of Motor Seizure Monitoring in ECT


1 Senior Resident, Department of Psychiatry, National Institute of Mental Health and Neurosciences, Bangalore -560 029, India
2 Additional Professor, Department of Psychiatry, National Institute of Mental Health and Neurosciences, Bangalore -560 029, India
3 Additional Professor, Department of Biostatistics, National Institute of Mental Health and Neurosciences, Bangalore -560 029, India

Correspondence Address:
B N Gangadhar
Additional Professor, Department of Psychiatry, National Institute of Mental Health and Neurosciences, Bangalore -560 029
India
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Source of Support: None, Conflict of Interest: None


PMID: 21494444

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Seizures were monitored using both cuff method and EEG, during the first ECT session in 158 consecutive patients. All developed adequate EEG seizures (>25 seconds). Twelve patients (8%) did not develop adequate motor seizures (15 seconds), of whom ten had no convulsive response. EEG seizure duration was less than 120 seconds in 117 patients (Group-A) and 120 or more seconds (prolonged) in the remaining 37 patients (Group-B). Adequate but not prolonged motor seizure (15-89 seconds) occurred in 111 patients in group A and 18 patients in group B. Motor seizure of 90 or more seconds (prolonged seizure) occurred in four patients in group A and 13 patients in group B. Based on the motor seizure criterion, 60% (18/31) of patients with prolonged EEG seizure were missed. The motor and EEG seizure durations correlated significantly in both groups. The correlation coefficient in group A was 0.78 (p<0.01), which was significantly larger (Fisher's 'Z' transformation test, t=3.12, p<0.01) than that in group B (0.37; p<0.05). Out of the total 158 patients, motor seizure monitoring alone did not correctly classify 21.4% of ECT seizure. This could have resulted in either unnecessary re-stimulation or failure to detect prolonged seizure. The findings suggest that in ECT motor seizure monitoring alone is unsatisfactory and therefore the need for EEG seizure monitoring.



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