Reinnervation of anal sphincter muscle by low and high-threshold motor neurones
| Autor: | Simon Podnar, Mico Mrkaic, D B Vodusek |
|---|---|
| Rok vydání: | 2001 |
| Předmět: |
Adult
Male medicine.medical_specialty External anal sphincter Urology Action Potentials Anal Canal Electromyography Physiology (medical) Humans Medicine Polyradiculopathy Aged Motor Neurons medicine.diagnostic_test business.industry Cauda equina Sensory loss Sequela General Medicine Anatomy Middle Aged medicine.disease Muscle Denervation Nerve Regeneration Motor unit medicine.anatomical_structure Neurology Sensation Disorders Sphincter Female Neurology (clinical) business Microelectrodes Muscle Contraction Reinnervation |
| Zdroj: | Neurophysiologie Clinique/Clinical Neurophysiology. 31:293-299 |
| ISSN: | 0987-7053 |
| DOI: | 10.1016/s0987-7053(01)00271-4 |
| Popis: | The external anal sphincter (EAS) has continuously active low-threshold and recruitable high-threshold motor units (MUs), the latter being ‘larger’. On performing concentric needle electromyography (EMG) of the EAS, the high-threshold MUs seemed to reveal more neuropathic changes than the low-threshold MUs. To verify this hypothesis, low- and high-threshold motor unit potentials (MUPs) were compared in patients with neuropathic EAS and controls. Fifteen subjects without pelvic disorders and 29 patients with sequela after cauda equina lesions were studied. In patients, only muscles ipsilateral to severe perianal sensory loss were included. MUPs were sampled using multi-MUP analysis during relaxation (‘low-threshold’), and on activation (‘high-threshold’ MUs). MUP parameters of low- and high-threshold MUs from controls and patients were compared, as was the sensitivity and specificity with which MUPs were classified as normal or pathological (using discriminant analysis). MUP changes due to reinnervation, and the sensitivity and specificity in classifying MUPs as normal or pathological were not significantly different between the low- and high-threshold MUPs. Stronger activation of EAS does not improve discrimination between neuropathic and normal MUPs. New EMG techniques for sampling sphincter MUPs at higher activation levels would seem not to yield additional information. |
| Databáze: | OpenAIRE |
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