A breakthrough seizure is an epileptic seizure that occurs, despite the use of anticonvulsants that have otherwise successfully prevented seizures in the patient. Breakthrough seizures may be more dangerous than non-breakthrough seizures because they may be less expected by the patient, who already considered him/herself free from seizures and therefore, not take any precautions. Epileptics with a higher intensity of seizures are more likely to suffer from a breakthrough seizure. Often when a breakthrough seizure occurs in a person whose seizures have always been well controlled, there is a new underlying cause to the seizure. Additional diagnostic methods include CT Scanning and MRI imaging or angiography. These may show structural lesions within the brain and heart, but the majority of those with epilepsy show nothing unusual.
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