Electromyographic monitoring of facial nerve under different levels of neuromuscular blockade during middle ear microsurgery.

摘要: Background The evoked electromyography (EMG) is frequently used to identify facial nerve in order prevent its damage during surgeries. Partial neuromuscular blockade (NMB) has been suggested favor EMG activity and insure patients' safety. aim of this study was determine an adequate level NMB correspondent sensible identification by evaluating the relationship between responses peripheral levels middle ear Methods Facial monitoring were performed simultaneously 40 patients who underwent tympanoplasty. electromyographic recorded insertion needle electrodes into orbicularis oris oculi muscles after electrical stimulation on nerve. observed objectively with hypothenar muscle's twitching ulnar nerve, intensity adjusted at 0, 25%, 50%, 75%, 90%, 100% respectively increased intravenous infusion Rocuronium (muscle relaxant). Results All had detectable ≤50%. Four out forty no response 275%. A significant linear positive correlation present thresholds while a negative amplitudes levels. Conclusions via can be obtained when intraoperative partial induced provide immobilization patient. 50% should considered as choice anesthetic management for otologic microsurgery based correlation.