Focal Tonic Seizures: Clinical Features and Management

Clinical Presentation

Focal tonic seizures usually brief in duration compared to generalized tonic-clonic seizures, according to the European Society of Cardiology 1
Unlike generalized seizures, focal tonic seizures may occur without significant impairment of awareness, as noted by the American Heart Association 2

Interictal EEGs are typically normal in patients with syncope but abnormal in epilepsy, as reported by the European Society of Cardiology 1, 3
EEG is crucial for differentiating between focal and generalized seizures, according to the American Heart Association 2
MRI is the preferred neuroimaging modality when indicated, as recommended by the American College of Radiology 2

Tonic seizures typically have a more prolonged duration compared to the brief tonic movements sometimes seen in syncope, as distinguished by the European Society of Cardiology 1, 3
In syncope, any tonic movements are short and start after loss of consciousness, while in seizures, tonic movements often coincide with or precede loss of consciousness, as noted by the European Society of Cardiology 1, 3

For any seizure, first aid providers should activate EMS for first-time seizures, seizures lasting >5 minutes, or multiple seizures without return to baseline, as advised by the American Heart Association 4
First aid providers should minimize injury risk by helping the person to the ground, placing them in recovery position, and clearing the area, as recommended by the American Heart Association 4
Treatment should be tailored to seizure type and contributing conditions, according to the American Academy of Neurology 5
Patients with genetic conditions may benefit from a "start low, go slow" approach to medication dosing due to lowered seizure threshold, as suggested by the American College of Medical Genetics 5