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Muscular Injury After Succinylcholine and Electroconvulsive Therapy

Both succinylcholine and seizures cause muscular injury during electroconvulsive therapy. We compared the muscular damage in two groups of patients. The psychiatric patient group received succinylcholine for electroconvulsive therapy. The surgical patient group received succinylcholine for endotracheal intubation. Serum myoglobin was measured as a marker for muscular injury and myalgic symptoms were also recorded. Serum myoglobin increased from baseline in both groups at 5 and 20 min. The surgical patients, however, had a higher myoglobin level than the psychiatric patients at 5 and 20 min after the administration of succinylcholine (P < 0.001). The median (range) of myoglobin concentration at 20 min in psychiatric patients was 32.6 (23.1–60.1) ng/mL, compared with 61.2 (31.6–1687.0) ng/mL in surgical patients. The incidence of myalgia was not different between the two groups. In conclusion, we unexpectedly conclude that the psychiatric patients who received electroconvulsive therapy had less effect of muscular damage associated with succinylcholine than the surgical patients did.