Persistance of response of muscle or neural elements after cessation of stimulation. Myotonia is a clinical manifestation of prolonged muscle a..
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af·ter·dis·charge -(.)dis(h)-.chärj n discharge of neural impulses (as by a ganglion cell) after termination of the initiating stimulus
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af·ter·dis·charge (af″tər-disґchahrj) the portion of the response to stimulation in a nerve which persists after the stimulus has ceased.Medical dictionary. 2011.