Njn. Harper et al., MONITORING NEUROMUSCULAR BLOCK BY ACCELEROMYOGRAPHY - COMPARISON OF THE MINI-ACCELOGRAPH WITH THE MYOGRAPH-2000, British Journal of Anaesthesia, 72(4), 1994, pp. 411-414
The precision of the compact Mini-Accelograph (M-A) was compared with
the Myograph 2000 (MYO). Neuromuscular block resulting from atracurium
was measured simultaneously by the MYO and the M-A applied to contral
ateral thumbs. During onset, the M-A frequently underestimated the ext
ent of block (maximal at approximately 50% twitch depression). The M-A
control train-of-four (TOF) ratio was characteristically > 1.0 and re
mained greater than the MYO ratio during the onset of atracurium. Duri
ng recovery, the difference between the MYO and the M-A was maximal at
approximately 50% twitch depression, but the M-A frequently overestim
ated the extent of block. The mean differences between the MYO and the
M-A were small in respect of the recovery index (RI) and the TOF. How
ever, the limits of agreement were unacceptably wide for both TOF and
RI. When the MYO TOF was 0.7, the corresponding M-A TOF varied between
0.4 and 1.0. The M-A was more susceptible to drift than the MYO.