Summary
Twenty-eight patients with peroneal muscular atrophy (PMA) have been investigated. Eighteen of them were affected by the Charcot-Marie-Tooth disease and three by Dejerine-Sottas disease. In these 21 cases the nerve conduction velocity (NCV) was decreased.
Four patients presented the neuronal type of PMA, two cases showed sensory neuropathy of the neuronal type with ophthalmoplegia, and one case, PMA with ataxia, i.e., a myatrophic ataxia. In the neuronal type of PMA, including both cases with ophthalmoplegia, the amplitudes of the sensory nerve action potentials were decreased, and the NCV was normal to slightly subnormal. In myatrophic ataxia NCV was decreased. In all cases with reduced NCV, the latencies of the spinal-evoked potentials (spinEP) and somatosensory-evoked potentials (ssEP) were prolonged. In the neuronal type of PMA, these latencies were normal.
The central latencies (from thoracic and cervical level) were normal in all 28 patients with PMA of different types.
Seventeen patients with Friedreich's heredoataxia have been investigated. In all except two cases, NCV was normal. The sensory nerve-action potentials markedly decreased or disappeared in all cases. The peripheral neurographic picture, accordingly, corresponds to that of patients with the neuronal type of PMA. The latencies of spinEP were normal. All patients with Friedreich's heredoataxia, however, showed prolonged latencies of ssEP. Calculating the central latencies as the difference between ssEP and spinEP latencies (cervical and thoracic) confirms that this is due to a slowing of the conduction velocity via the spinobulbar tracts.
Zusammenfassung
28 Patienten mit neuraler Muskelatrophie (NMA) wurden untersucht. Davon hatten 18 Patienten eine vom Typ Charcot-Marie-Tooth, 3 Patienten eine vom Typ Dejerine-Sottas. Bei diesen 21 Fällen war die Nervenleitgeschwindigkeit (NLG) vermindert. Bei 4 Patienten lag die neuronale Form der NMA vor. In 2 Fällen bestand eine Neuropathie vom axonalen Typ mit Ophthalmoplegie; in einem Fall eine NMA mit Ataxie, eine sog. myatrophische Ataxie. Bei den Fällen mit neuronaler Form der NMA einschließlich der beiden Fälle mit Ophthalmoplegie waren die Amplituden der sensiblen Nervenaktionspotentiale (NAP) vermindert, die NLG normal bis leicht subnormal. Bei myatrophischer Ataxie war die NLG vermindert.
In allen Fällen mit herabgesetzter NLG fanden sich Verlängerungen der Latenzen der spinalen Evoked Potentials (spinEP) und somatosensiblen Evoked Potentials (ssEP). Bei axonaler NMA waren diese Latenzen normal. Die zentralen Leitungsverhältnisse — zentrale Latenzzeiten von thorakal und cervical nach cortical — waren in allen untersuchten 28 Fällen bei Patienten mit NMA der verschiedenen Formen normal.
17 Patienten mit Friedreichscher Erkrankung wurden untersucht. Bis auf 2 Fälle hatten sie normale NLG. Die sensiblen NAP waren in allen Fällen stark herabgesetzt oder aufgehoben. Das periphere neurographische Bild entspricht demnach dem der Patienten mit neuronaler Form der NMA. Die Latenzen der spinEP waren normal. Alle Patienten mit Friedreichscher Ataxie zeigten aber verlängerte Latenzen der ssEP. Nach Bestimmung der zentralen Latenzzeiten — als Differenz der Latenzen der ssEP und spinEP cervical und thoracal — beruht dies auf einer Herabsetzung der Erregungsleitung zentral zwischen thorakal bzw. cervical und cortical, und damit auf einer Verlangsamung der Erregungsleitung über die Tractus spino-bulbares.
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Mit Unterstützung durch die Deutsche Forschungsgemeinschaft über Sonderforschungsbereich Hirnforschung und Sinnesphysiologie (SFB 70)
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Sauer, M. Somatosensible Leitungsmessungen bei neurologischen Systemerkrankungen. Arch. Psychiat. Nervenkr. 228, 223–242 (1980). https://doi.org/10.1007/BF00342348
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DOI: https://doi.org/10.1007/BF00342348
Key words
- Nerve conduction velocity
- Somatosensory nerve action potentials
- Spinal evoked potentials
- Cortical evoked potentials
- Peroneal muscular atrophy
- Neuronal muscular atrophy
- Friedreich's heredoataxia