Versive Seizure or Head Version
The medical term for involuntary head deviation to one side that occurs before or during a seizure is "head version" or "versive seizure." This phenomenon consists of forced, involuntary, sustained, and unnatural turning of the head (often accompanied by eye deviation) toward one side 1.
Clinical Characteristics
Head version during seizures has several key features:
- Conjugate eye movements occur in the same direction as head deviation in 97.6% of cases 1
- The movements are typically saccadic (89.3% of cases) rather than smooth 1
- There is often an oblique upward direction to the eye movements (86.8% of seizures) 1
- Vertical head component is present, with chin moving upward in 93% of cases, indicating activation of the ipsilateral sternocleidomastoid muscle 1
- Ipsilateral facial motor activity accompanies version in 93% of seizures, usually clonic superimposed on tonic facial contraction 1
Lateralizing Value and Important Caveats
While head version is generally considered a reliable lateralizing sign pointing to the contralateral hemisphere, this rule has important exceptions:
Focal Seizures
- In focal-onset seizures, particularly from anterior regions (frontal lobe or anterior/midcingulate), 87% show contralateral head version 2
- Temporal lobe seizures are less reliable: only 56% show contralateral version, meaning 44% may show ipsilateral version 2
- Anterior regions have an 8-fold higher likelihood of contralateral versive seizures compared to temporal regions 2
- Posterior regions (parietal, occipital, posterior cingulate) show contralateral version in only 56% of cases 2
Generalized Epilepsy
A critical pitfall: 25% of patients with primary generalized epilepsy demonstrate forced head version during generalized tonic-clonic seizures 3. Some patients even show turning to different sides on consecutive seizures 3, 4. This can lead to diagnostic confusion and mislocalization if clinicians assume all head version indicates focal seizure origin 4.
Clinical Implications
When evaluating head version:
- Do not rely on head version alone to lateralize seizure onset, especially in temporal or posterior seizures 2
- Consider ipsilateral hemisphere involvement in presurgical evaluation when early head version is present 2
- Require comprehensive video-EEG evaluation to distinguish focal from generalized epilepsy when version is present 4
- The symptomatogenic zone for version is most likely the frontal eye field, given the close association between eye and head deviation 1