myotonia

Thân thiện

A doctor demonstrates myotonia by showing a patient's hand slowly relaxing after a firm handshake.

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)

Học thuật

Noun

1. abnormally long muscular contractions; slow relaxation of a muscle after a contraction