Table 5.

Proposed Axis 1 clinical characteristics for EA.

CLINICAL CHARACTERISTICS OF EA (AXIS 1)				OTHER NEUROLOGIC DISORDERS
AGE AT ONSET	ATTACK DURATION	SIMPLE OR COMPLEX ATTACK	INTERICTAL FEATURES
Infancy (birth to age 2) Childhood (3–12 years) Adolescence (13–20 years) Early adult (21–40 years) Late adult (>40 years)	Short (seconds-minutes) Moderate (hours) Long (days or longer)	Paroxysmal ataxia-dysarthria – isolated OR – with other features tinnitus – vertigo – nystagmus – brainstem – neuromuscular – migraine – other	Nystagmus Myokymia Other cerebellar signs Tremor Other neurologic signs	Migraine Epilepsy Intellectual impairment Deafness Autism Paroxysmal disorder of infancy

There are five proposed clinical descriptors in Axis 1 (age at onset, attack duration, attack complexity, interictal features, and other neurologic comorbidities).