The construction and evaluation of a device for mechanomyography in anaesthetized Göttingen minipigs
Version of Record online: 13 JUL 2012
© 2012 The Authors. Veterinary Anaesthesia and Analgesia. © 2012 Association of Veterinary Anaesthetists and the American College of Veterinary Anesthesiologists
Veterinary Anaesthesia and Analgesia
Volume 40, Issue 2, pages 134–141, March 2013
How to Cite
Clutton, R. E., Dissanayake, K., Lawson, H., Simpson, K., Thompson, A. and Eddleston, M. (2013), The construction and evaluation of a device for mechanomyography in anaesthetized Göttingen minipigs. Veterinary Anaesthesia and Analgesia, 40: 134–141. doi: 10.1111/j.1467-2995.2012.00755.x
- Issue online: 13 FEB 2013
- Version of Record online: 13 JUL 2012
- Received 10 October 2011; accepted 18 April 2012.
- reverse fade
Objective To devise a method for assessing evoked muscle strength on nerve stimulation [mechanomyography (MMG)] in the anaesthetized minipig.
Study design Prospective observational.
Animals Sixty male Göttingen minipigs weighing 10.5–26.0 kg.
Methods After cadaveric studies, a limb fixation device was constructed which allowed the twitch responses of the pelvic limb digital extensor muscles to be measured by force-displacement transduction in response to supramaximal train-of-four (TOF) stimulation of the common peroneal nerve. The device was tested in 60 minipigs weighing 10.5–26.0 kg positioned in dorsal recumbency.
Results The technique recorded the MMG of the common peroneal–pelvic limb digital extensor nerve-muscle unit for up to 12 hours during which twitch height remained constant in 18 animals in which single twitch duration was <300–500 ms. In 42, in which twitch duration was >300–500 ms, 2 Hz nerve stimulation caused progressive baseline elevation (reverse fade) necessitating a modified signal capture method for TOF ratio (TOFR) computation. However, T1 was unaffected. The mean (range) of the TOFR in pigs with reverse fade was 1.2 (1.1–1.3).
Conclusions and clinical relevance The technique allowed MMG recording in unparalysed pigs in response to TOF nerve stimulation and revealed a hitherto unreported complication of MMG monitoring using TOF in animals: reverse fade. This complicated TOFR calculation.