Phonomyography

PMG (acoustic myography) is a relatively new method of monitoring neuromuscular function.^{[84] [85] [86] [87] [88] [89]} The contraction of skeletal muscles generates intrinsic low-frequency sounds, which can be recorded using special microphones. This method has been evaluated for clinical and research purposes. Several reports indicate a good correlation between the evoked acoustic responses and responses obtained using more traditional methods of recording, such as MMG, EMG, and AMG. However, it is uncertain whether PMG will ever be used for monitoring neuromuscular block during routine anesthesia. What does make PMG interesting, however, is that in theory the method can be applied not only to the adductor pollicis muscle but also to other muscles of interest such as the diaphragm, the larynx, and the eye muscles. Also, the ease of application is attractive.

For further information on recording evoked responses, the reader is referred to guidelines for Good Clinical Research Practice in pharmacodynamic studies of neuromuscular blocking agents, published in Acta Anaesthesiologica Scandinavica. ^[53]