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Myotonia and Myoclonus

Myoclonus is defined as a brief, shock‐ or jerk-like movement secondary to involuntary muscle contraction or relaxation. It can be hyperkinetic which manifests as a jerking muscle contraction, or hypokinetic where there can be loss of muscle tone resulting in stumbling or falling. 

Myoclonus in older Cavalier King Charles Spaniels

The aim of this retrospective study was to document the characteristics and treatment of myoclonic episodes in a cohort of CKCS. 

Thirteen of 39 dogs with myoclonus had paroxysmal events, such as generalized seizures (9/13). Clinical signs were spontaneous in onset, lasted a few seconds and consisted of rapid blinking with head nodding and variable extension down the thoracic limbs. Myoclonus occasionally led to stumbling of the thoracic limbs or collapse. Mean age of onset was 8.38 years. 

An example of this is shown in the video of one of our previous patients below.

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