TL;DR: A seizure lasting longer than five minutes is a life-threatening medical emergency that requires immediate veterinary intervention to prevent permanent brain damage and organ failure.
What is a prolonged seizure in cats and why is it dangerous?
- A seizure is a sudden, uncontrolled electrical disturbance in the brain that causes a cat to lose consciousness, twitch violently, or exhibit unusual behaviors.
- When a seizure persists for more than five minutes, it is classified as Status Epilepticus.
- This is a severe condition where the brain is locked in a cycle of continuous seizure activity, which can lead to permanent damage if not medically interrupted.
Is a prolonged seizure in my cat a medical emergency?
- Urgency Level: High. Yes, this is a life-threatening medical emergency.
- If a seizure lasts five minutes or longer, the cat's body temperature can rise to dangerous levels and internal organs may begin to fail.
- Contact the nearest emergency veterinary hospital immediately and begin transport.
- Do not wait for the episode to end on its own.
How does taking a video of my cat’s seizure help the veterinarian?
- Capturing a brief video provides the veterinary team with visual evidence of the specific type of motor activity and the severity of the episode.
- Visuals help the doctor distinguish between a seizure and similar-looking conditions, such as fainting or vestibular disease.
- This ensures your cat receives the correct emergency stabilization and an appropriate long-term treatment plan.
Clinical Context (Merck Veterinary Manual)
For a cat experiencing a seizure lasting more than 5 minutes, characterized as status epilepticus, diazepam can be administered intravenously as a bolus (0.5-2 mg/kg), repeated up to three times at 5-10 minute intervals. If seizures persist after the second or third bolus, a constant-rate infusion (CRI) of diazepam at 0.5-2 mg/kg/hr may be initiated. Alternatively, propofol can be administered as a CRI at 0.1-0.3 mg/kg/min intravenously to effect. If the animal is not already receiving phenobarbital, a loading dose of 2-4 mg/kg intravenously every 6 hours for a total of four doses may be given. If phenobarbital is contraindicated due to hepatic issues, levetiracetam 40-60 mg/kg can be administered intravenously, subcutaneously, or rectally.
Chapter: Neurology, Emergency, Pharmacology
Source: The Merck Veterinary Manual, 11th Edition (Page 1220)