Muscle potentials evoked by magnetic stimulation of the sciatic nerve in unilateral sciatic nerve dysfunction

Abstract

Magnetic stimulation of the sciatic nerve and subsequent recording of the muscle-evoked potential (MEP) was performed in eight dogs and three cats with unilateral sciatic nerve dysfunction. Localisation of the lesion in the sciatic nerve was based on the history, clinical neurological examination and on results of electromyography examination. Aetiology of the sciatic nerve lesion was diverse. A significant difference was found in MEP between the normal and the affected limbs. In addition, absence of conscious pain sensation, absence of voluntary motor function and a poor outcome seemed associated with the inability to evoke an MEP in the affected limb.

Traumatic and iatrogenic sciatic nerve injury in 38 dogs and 10 cats: Clinical and electrodiagnostic findings

“…16 The MNCS and MEP are considered valuable for predicting the prognosis of nerve injury. 10 Both tests objectively assess motor function by stimulating motor pathways and recording CMAP produced by muscles of the limbs.…”

“…20 Tibial nerve F-wave assessments on the affected limb were performed in some patients and their presence or absence was recorded (Figure 3). 10,21 Specific details on the execution and recording of the F-waves are reported in File S1.…”

“…23 When performed, the presence (Figure 6A) or absence (Figure 6B) of motor-evoked potentials (MEP) was reported. 10 Specific details on the execution and recording of both CDP and MEP are reported in File S1.…”

“…7,8 An estimate of the functional damage to nerve fibers can be provided by an accurate neurological examination and the application of electrodiagnostic tests (EDX). 9,10 Clinical and EDX results have been investigated as prognostic indicators in traumatic brachial plexus injuries. 4,11 Only a few studies have been published on SNI in dogs and cats.…”

Bilateral obturator neuropathy caused by an intrapelvic fibrosarcoma with myofibroblastic features in a dog

“…In dogs, neoplasms affecting the peripheral nerves of the lumbosacral plexus are rare, with only case descriptions of sciatic or femoral neuropathies (Abraham and others , Brower and others , Montoliu and others , Harcourt‐Brown and others , Van Soens and others ). In theory, each tumour adjacent to a peripheral nerve can cause neurological dysfunction secondary to nerve compression or infiltration.…”