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Disease Definitions

Andersen-Tawil Syndrome (A form of Periodic paralysis)

Andersen-Tawil syndrome is a rare form of periodic paralysis that affects the function of skeletal and heart muscles.  Periodic paralysis is characterized by episodes of muscle weakness

Advocacy Groups for ATS


Episodic Ataxias

The episodic ataxias are characterized by attacks of clumsiness and imbalance triggered by factors such as stress or fatigue.  Episodic ataxia type 1 is characterized by episodes of imbalance with fine twitching or rippling of muscles, which is difficult to see except in small muscles of the hand and face but is detectable by electro-myography.  Episodic ataxia 2 is characterized by episodes of slurring of speech and gait imbalance and dysfunction of eye movements.

Advocacy Groups for Episodic Ataxias


Non-dystrophic Myotonic Disorders

The non-dystrophic myotonias are a group of rare conditions that demonstrate delayed relaxation of muscle after voluntary contraction or mechanical stimulation.  Weakness or stiffness may occur at these times. 

Advocacy Groups for Myotonic Disorders