myotonia
Definition
Noun: * A condition characterized by impaired muscle relaxation after voluntary contraction or stimulation, resulting in abnormally prolonged muscle tensing or stiffness.
Usage
- is a clinical sign, not a disease itself, and is a key feature of certain neuromuscular disorders.
- The term is primarily used in medical and clinical contexts to describe a specific type of muscle dysfunction.
- It is often discussed in relation to its causes, such as channelopathies, or the disorders it characterizes.
Examples
- The patient's difficulty releasing a handgrip was a clear sign of myotonia.
- Myotonia can be induced by percussion of a muscle group.
- A common symptom is myotonia that worsens in cold temperatures.
Advanced Usage
- Myotonia congenita: A specific hereditary disorder (of which there are two main types, Thomsen and Becker) characterized by myotonia without muscle wasting.
- Paramyotonia congenita: A disorder where myotonia is paradoxically worsened by repeated activity (paradoxical myotonia) and is strongly aggravated by cold.
- Myotonic dystrophy: A multisystem genetic disorder where myotonia is a primary feature, accompanied by progressive muscle weakness and wasting, and other systemic issues.
Variants and Related Words
- Myotonic (adjective): Relating to or affected by myotonia.
- Example: He has a myotonic disorder.
- Myotonia acquisita: A rare, acquired form of myotonia.
Synonyms
- Delayed muscle relaxation
- Impaired muscle relaxation
- Prolonged muscular contraction
Antonyms
- Normal muscle relaxation
- Muscle flaccidity (in a different pathological context)
Noun
-
abnormally long muscular contractions; slow relaxation of a muscle after a contraction
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