The major hazard in the use of curare-like drugs in anesthesia is the failure to antagonize residual muscle weakness. We have shown that the head-raising test is not always a reliable index of curare recovery. On the other hand, a sustained muscular contraction in response to tetanic nerve stimulation could always be correlated with greater than 90% recovery in vital capacity and maximum voluntary ventilation. We recommend that in the event a patient cannot maintain a tetanic contracture, residual effects from the administration of curare should be treated with an anticholinesterase drug.
Walts LF, Levin N, Dillon JB. Assessment of Recovery From Curare. JAMA. 1970;213(11):1894–1896. doi:10.1001/jama.1970.03170370078019