What is Aura Continua
Aura continua is not a formally recognized diagnostic entity, but rather refers to a rare clinical phenomenon where migraine aura symptoms persist continuously or recur without the typical time-limited pattern seen in classic migraine with aura.
Clinical Context and Terminology
The term "aura continua" appears to be used colloquially in clinical practice to describe persistent or continuously recurring aura symptoms, though it lacks formal classification in headache diagnostic criteria 1. This should be distinguished from several related but distinct conditions:
Key Distinctions
Persistent Aura Without Infarction: A formally recognized condition where aura symptoms last longer than 1 week without evidence of infarction on neuroimaging 2. This represents a diagnostic challenge requiring exclusion of stroke, structural brain lesions, epilepsy, and psychiatric conditions.
Typical Migraine Aura: Defined as transient focal neurological symptoms (usually visual in >90% of cases, sensory in ~31%) that typically last less than 1 hour and precede or accompany headache 1.
Hemicrania Continua with Aura: A rare variant where visual auras precede or accompany pain exacerbations in hemicrania continua (a continuous unilateral headache responsive to indomethacin) 3, 4.
Clinical Significance
When encountering what appears to be "aura continua," the critical diagnostic imperative is to:
Rule out cerebral infarction - Neuroimaging is mandatory to exclude stroke, particularly in patients with prolonged aura symptoms 2
Consider alternative etiologies - Aura-like symptoms can occur with non-migraine conditions including cluster headache, hemicrania continua, and other trigeminal autonomic cephalalgias, though this is typically mediated by comorbid migraine with aura 5, 6
Assess for structural lesions - Brain imaging should exclude tumors, vascular malformations, or other structural abnormalities 2
Important Caveats
- Avoid triptans in patients with persistent aura, as these may be deleterious 2
- Anticoagulation is not indicated for persistent aura without infarction 2
- Treatment options that may be beneficial include acetazolamide, valproic acid, zonisamide, furosemide, corticosteroids, and ketamine 2
The underlying mechanism is thought to involve cortical spreading depression and vasoconstriction 2, similar to typical migraine aura but with abnormal persistence or recurrence patterns.