Suxamethonium-induced muscle contracture following traumatic denervation in man.

The effects of the systemic and of the i.v. regional administration of suxamethonium were investigated in 23 patients with traumatic nerve injury. Following the systemic administration of suxamethonium 100 mg, normally innervated muscles showed muscle fasciculations initially, followed by muscular relaxation. On the other hand, denervated muscles did not fasciculate and, in 21 patients, manifested suxamethonium-induced contractures. In the other two patients no response was observed. In 10 of the patients, the i.v. regional administration of suxamethonium 5 mg was followed by a contracture of the denervated muscle which was maintained until the tourniquet was deflated. No systemic reaction to suxamethonium, other than mild ptosis, followed the release of the tourniquet.