I can not find a connection between Trileptal and prolonged QT. Some patients with seizures can have abnormal caridac conduction during seizures, and in a small number of patients a seizure can result in the heart temporarily stopping. However in between seizures the epilepsy should not affect your cardiac rhythm. Therefore, I would recommend having the cardiac condition evaluated and only after the testing has been normal consider seizures as a cause. If seizures are causing the problem this can be documented by performing epilepsy monitoring. This involves being admitted to the hopsital (in a special epilepsy monitoring unit) and monitoring your heart rhythm when you have a seizure. Genetic testing for epilepsy is still only being used as a research tool. Good luck.