Essential Tremor
Essential tremor (ET) is the most common adult movement disorder, affecting approximately 5 per cent of the population over age 65. It is characterised by an 8–12 Hz postural and kinetic tremor of the upper limbs, though the head, voice, trunk, and lower limbs may also be involved.
Understanding Essential Tremor
Essential tremor has historically been mischaracterised as "benign," but the disease is progressive and can be severely disabling. The tremor appears during voluntary movement (kinetic) and when maintaining a posture against gravity (postural), but unlike Parkinson's disease, it is rarely present at rest. The pathophysiology centres on abnormal oscillatory activity in the cerebello-thalamo-cortical circuit, with the ventral intermediate nucleus (VIM) of the thalamus serving as the oscillation generator. Over time, the tremor amplitude increases, the frequency may slow, and the condition spreads to involve the head, voice, and sometimes the trunk.
The impact on daily life is profound: patients struggle to drink from a cup, write legibly, use utensils, button clothing, or perform fine motor tasks. Social embarrassment and isolation are common. For patients who do not respond to or cannot tolerate first-line medications (propranolol, primidone), deep brain stimulation of the VIM thalamus offers 80 per cent or greater tremor suppression and dramatic functional improvement. Istanbul provides access to expert DBS neurosurgery at 60 per cent below Western costs.
Treatment Options for Essential Tremor
View All ProceduresSymptoms of Essential Tremor
Essential tremor typically begins insidiously in the hands, affecting one side before becoming bilateral. The tremor is rhythmic, sinusoidal, and most noticeable during goal-directed movements — the classic "drinking from a cup" tremor that worsens as the cup approaches the mouth. Head tremor produces a "yes-yes" (vertical) or "no-no" (horizontal) oscillation. Voice tremor gives the voice a quavering quality. The tremor may be temporarily suppressed by alcohol in 50–70 per cent of patients, which is a useful diagnostic clue but not a treatment strategy. Unlike Parkinson's disease, essential tremor does not cause bradykinesia, rigidity, or postural instability.
Diagnostic Pathways
Clinical history and examination remain the diagnostic cornerstone. The tremor is assessed during rest, posture, and action using the Washington Heights-Inwood Genetic Study of Essential Tremor (WHIGET) rating scale. Laboratory tests exclude metabolic causes: thyroid function tests, serum copper and ceruloplasmin (Wilson's disease), and comprehensive metabolic panel. DAT-SPECT imaging (DaTscan) may be used to differentiate essential tremor from Parkinson's disease when the diagnosis is unclear — normal striatal dopamine transporter binding supports a diagnosis of ET. Genetic testing is not routinely indicated but may be considered in early-onset or familial cases.
Advanced Treatment Options at Vellum Select
Deep Brain Stimulation (DBS)
For medication-refractory essential tremor, Deep Brain Stimulation (DBS) in Turkey targeting the ventral intermediate nucleus (VIM) of the thalamus is the gold-standard surgical treatment. Unilateral VIM-DBS produces 80–90 per cent tremor suppression in the contralateral arm. Bilateral DBS may be considered for head and voice tremor but carries a higher risk of speech disturbance. The procedure is performed under local anaesthesia with the patient awake for intraoperative test stimulation to confirm optimal lead placement and assess side effects. Tremor suppression is immediate upon activation of the stimulator.
To discuss your essential tremor diagnosis with a Vellum Select movement disorder specialist, contact us to arrange a consultation.