Idiopathic Epilepsy

TL;DR. Trastorno convulsivo genético: crisis recurrentes con la mascota normal entre episodios; diagnóstico por exclusión y manejo médico de por vida.

Entre crisis, los animales con epilepsia idiopática parecen sanos.

¿Qué es?

Idiopathic (inherited) epilepsy is recurrent unprovoked seizures with a normal brain between episodes. Neurons fire in a disorganized surge; no structural brain disease or metabolic toxin is found. Common in dogs; uncommon in cats. Diagnosis is by exclusion.

Causas y factores de riesgo

Presumed genetic. Distinct from reactive seizures (toxin/metabolic) and structural epilepsy (tumor, inflammation, prior trauma). Onset typically young to middle-aged animals. Normal interictal exam and advanced workup support the diagnosis.

Signos a vigilar

• Generalized tonic-clonic seizures (common)
• Focal seizures, cluster seizures (occasional)
• Status epilepticus: continuous seizure >5 min or no recovery between seizures (emergency)
• Mild anxious rigidity in some breeds (e.g. Labrador, Miniature Poodle)

Algunas razas tienen crisis leves con postura agachada y rigidez.

Cómo lo diagnostican los veterinarios

Physical/neurologic exam between events. Bloodwork and glucose to exclude reactive causes; FeLV/FIV in cats. MRI and CSF when indicated to exclude structural disease. Diagnosis when extensive evaluation is normal.

La analítica descarta causas metabólicas antes del diagnóstico.

Opciones de tratamiento

Lifelong anticonvulsants to reduce frequency and severity: barbiturates, potassium bromide (generally avoid in cats), zonisamide, levetiracetam; second-line e.g. felbamate. Monitor levels and side effects.

Pronóstico

Many pets have good quality of life on therapy. Harder with early onset, large-breed cluster seizures. Feline data more limited.

Prevención

No lifestyle prevention. Do not breed affected animals or close relatives in predisposed lines.

Cuándo llamar al veterinario

Emergency: seizure >5 min, clusters within 24 h, failure to regain consciousness, severe post-ictal aggression or continuous head pressing.

Fuentes

• Nelson, R.W. and Couto, C.G. Small Animal Internal Medicine, 5th Edition, pp. 1051, 1052.
• Silverstein, D.C. and Hopper, K. Small Animal Critical Care Medicine, 2nd Edition, p. 956.

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