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Monitoring Muscle Viability Using Evoked M Waves

The experiments described reveal the direct relationship between blood flow and evoked electrical activity in muscle flaps. It is demonstrated that monitoring of EMWs will detect vascular occlusion to a muscle flap within 1 hour. Detecting failure this soon provides the surgeon an opportunity for reexploration and salvage of a muscle flap before irreversible change has occurred. Correlations with observed muscle contraction and intramuscular temperature changes are also made.