Final answer:
Seizures lasting longer than 90 seconds during ECT should be managed with anticonvulsants like diazepam to improve prognosis and reduce brain damage risk.
Step-by-step explanation:
Seizures from Electroconvulsive Therapy (ECT) that last longer than 90 seconds should be treated with anticonvulsants, such as diazepam. These anticonvulsants serve to manage the seizures, which can improve the long-term prognosis for the patient and reduce the risk of brain damage. This treatment is critical, as prolonged seizures can lead to serious complications such as onset of sustained ventricular contraction and respiratory paralysis. It's important to note that in severe cases of arrhythmia, controlled electric shock in the form of cardioversion or defibrillation might be utilized to restore a normal heart rhythm.