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  • Title: [Lower motor neuron disease and signs of dysimmunity].
    Author: Azulay JP, Attarian S, Boucraut J, Pouget J.
    Journal: Rev Neurol (Paris); 2000 Apr; 156(4):372-9. PubMed ID: 10795014.
    Abstract:
    Twenty-two patients (12 men, 10 women, age range 16 to 60) affected with an adult-onset, sporadic, lower motor neuron disease were studied. Motor weakness was associated with a severe muscular atrophy but never in a peripheral nerve distribution. Weakness predominated in the proximal parts of the limbs in 3 cases, in distal parts in 10 cases involving predominantly the upper limbs in 10. It was diffuse in all four limbs in six cases and was monomelic in the last 2 two others. Reflexes were generally lost in weak muscles. Electrodiagnostic findings consisted of pure motor axonal features, subtle sensory involvement was present in 3 cases with an IgM monoclonal gammopathy, in only one case the neurological syndrome was associated with a lymphoproliferative disorder despite complete investigations. All patients had dysimmune biological features (MGUS or anti-GM1 antibodies). We studied SMN gene in 12 patients and found no deletion. 16 patients were treated with IVIg and five improved but in 2 cases the improvement was transcient and lasted less than six months. Intravenous cyclophosphamide (1g/m(2) repeated monthly during 6 to 9 months) was used in six patients and three improved. Among these three patients two received also plasma exchanges on two days before the infusion. In all three patients, muscle weakness gradually deteriorated in the months following the end of the treatment. Nor the weakness pattern nor the type of biological marker was predictive of a good response to treatment. Lower motor neuron diseases appear to be much less sensitive to treatment than multifocal motor neuropathy with conduction block. However, treatment with IVIg or cyclophosphamide must be considered in the most severe forms or in case of a young onset.
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