Model Introduction
Epilepsy is a common and frequent chronic brain disorder characterized primarily by sudden, recurrent, and transient central nervous system dysfunction caused by excessive neuronal discharges in the brain. Due to its complex etiology and diverse pathological manifestations, epilepsy presents significant challenges in clinical diagnosis and mechanistic research.
Epileptiform discharges on electroencephalography (EEG) and clinical seizures constitute the two core features of epilepsy. Epileptiform discharges represent the manifestation of abnormal synchronous activity of local neurons on the EEG. As an objective reflection of neuronal activity, epileptiform discharges detected by EEG remain a critical objective basis for epilepsy diagnosis and seizure focus localization.
This model utilizes adult Wistar rats and employs the classic lithium chloride-pilocarpine induction method to successfully construct a chronic temporal lobe epilepsy (TLE) model for long-term seizure monitoring and EEG data acquisition.
Research Applications
Establishing stable animal models under laboratory conditions is of significant importance because human epileptic EEG samples are difficult to obtain, easily affected by the external environment and patient movement, and restricted by ethical and experimental methodological constraints.
Through the chronic TLE rat model, a large volume of behavioral and EEG data can be obtained in a controlled environment to validate the accuracy of existing algorithms. Completing methodological validation at the animal stage before further application to human data research helps overcome clinical data collection challenges and effectively shortens the overall scientific research cycle.
Key Points of Experimental Design
A total of 7 healthy adult Wistar rats were selected for this study, including 5 in the model group and 2 in the normal control group. The model construction utilizes the lithium chloride-pilocarpine induction protocol:
- Day 1: The model group receives an intraperitoneal (i.p.) injection of lithium chloride (3 mmol/kg body weight);
- Day 2 (24 hours later): Pilocarpine (20 mg/kg body weight, i.p.) is injected every 30 minutes;
- If a Stage 5 status epilepticus (SE) (lasting more than 1 hour) occurs within 3 injections, pilocarpine administration is stopped immediately;
- If SE is not reached, the dose is changed to 10 mg/kg, injected every 15 minutes until SE occurs;
- After 60 minutes of SE, diazepam (10 mg/kg, i.p.) is injected to terminate the seizures;
- If a single dose cannot terminate the seizure, an additional 15%–25% of the initial dose is administered every 10 minutes until the seizures basically cease.
During model induction, rats exhibit manifestations such as reduced activity, tremors, head nodding, scratching, “face-washing” activity, facial twitching, single-limb clonus, wet-dog shakes, and imbalance, progressively developing into Stage 5 generalized tonic-clonic seizures and entering status epilepticus.
One rat died on the 5th day post-induction, and the remaining 4 survived. Video monitoring showed that after 2 weeks, all surviving rats experienced more than three Stage 5 seizures per week, with some individuals reaching 2–3 times per day, confirming successful model construction. After successful modeling, independent housing is adopted to prevent mutual injury between individuals.
Key Detection Indicators
- Behavioral seizure grading (whether Stage 5 and status epilepticus are reached)
- Spontaneous seizure frequency (weekly and daily seizure counts)
- EEG monitoring for epileptiform discharges
- Survival status and modeling success rate
