There are very few reported cases of PED, there are approximately 20 reported sporadic cases of PED and 9 PED families but there is some dispute on the exact number of cases. In addition it appears that PED becomes less severe with aging. Prior to onset of a PED episode some patients reported onset of symptoms including sweating, pallor, and hyperventilation. In brain scans it was observed that patients suffering form frequent PEDs there was increased metabolism in the putamen of the brain and decreased metabolism in the frontal lobe. Another study using subtraction single photon emission computed tomographic (SPECT) imaging technique which was coregistered with an MRI on a patient presented with PED symptoms showed increased cerebral perfusion in the primary somatosensory cortex area, and a mild increase in the region of the primary motor cortex and cerebellum. While all these correlations are not fully understand as to what exactly is happening in the brain it provides areas of interest to study further to hopefully understand PED more fully.
Paroxysmal exercise-induced dystonia
Dopamine-responsive dystonia
Paroxysmal kinesigenic choreoathetosis
Potassium-aggravated myotonia
Post-encephalitic parkinsonism
Benign fasciculation syndrome
Levodopa-induced dyskinesia
Myotonia congenita