Myoclonic (MY-o-KLON-ik) seizures are brief, shock-like jerks of a muscle or a group of muscles. “Myo” means muscle and “clonus” (KLOH-nus) means rapidly alternating contraction and relaxation—jerking or twitching—of a muscle. Usually they don’t last more than a second or two. There can be just one, but sometimes many will occur within a short time.
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