Focal Tonic Seizure
Tonic seizure is characterized by a stiffening of a particular body part. It can be caused by brain tumors, head injuries, and ruptured blood vessels in the brain.
In patients with tonic seizures, the person is at risk of falling because of their loss of muscle control. They may also experience confusion. Some of these patients are susceptible to generalized apnea.
The EEG is useful in monitoring brain function. Focal tonic seizures are characterized by a sudden onset of tonic posturing of one or both extremities. These seizures can progress to focal clonic seizures.
Most of the time, the duration of a tonic seizure is brief. However, the duration can vary according to the individual patient. A tonic seizure that lasts a long time may be accompanied by generalized spike-wave discharges.
Focal tonic-clonic seizures are seizures that involve the arm and face of one side of the body. These types of seizures are rare. https://epilepsyseizure.co.nz/ Another common type is the astonic-absence seizure, which is an absence of tonic posturing.
A 38-year-old man had a primary generalized tonic-clonic seizure and secondary generalized tonic-clonic seizures. He also had epileptic spasms on the right side of his body. His EEG recorded a polyspike-wave complex that was 1.6-3.4 Hz, which slowed down towards the end of the seizure.
Clonic seizures are common in focal epilepsy. They occur in approximately 57% of frontal lobe epilepsy patients. One study found that the majority of patients with focal clonic seizures were preceded by a focal tonic seizure.