DBS for Essential Tremor: When Parkinson's Is Ruled Out

Condition

The patient had been living with a progressive bilateral hand tremor for 11 years before presenting to Dr. Guruprasad Hosurkar, a leading neurologist in Bangalore specialising in movement disorders and deep brain stimulation surgery. The tremor was action-dominant, worst when the hands were held outstretched or during intentional movement which distinguished it clinically from the resting tremor typical of Parkinson’s disease. Over the years it had worsened steadily, and by the time of this consultation it had become severely disabling.

He could no longer sign documents, use a keyboard accurately, pour a glass of water without spillage, or bring a spoon to his mouth without significant difficulty. As a chartered accountant whose work required precision and fine motor control, the functional impact on his professional life was profound. He had tried four medications over eight yearsPropranolol, Primidone, Topiramate, and Clonazepam each with partial, inconsistent, or short-lived benefit, and side effects had prevented further dose escalation with two of them.

Multiple previous clinicians had considered Parkinson’s disease, and the patient himself had been anxious about this possibility for years. No definitive neurological investigation had been performed to exclude it.

Emotional and Psychological Impact

Eleven years of uncontrolled tremor had significantly eroded the patient’s confidence and professional identity. He had begun avoiding client meetings, delegating document signing to colleagues, and reducing face-to-face interactions where the tremor would be visible. His family described a gradual withdrawal from social situations restaurants, gatherings, any setting where eating or writing in public was required.

The anxiety around a possible Parkinson’s diagnosis had also been a persistent source of distress. When DaTscan imaging confirmed that dopaminergic pathways were normal and Parkinson’s disease was excluded, the patient described the news as a significant relief even before the DBS conversation began. The initial consultation with Dr. Guruprasad Hosurkar addressed not just the clinical plan but also the patient’s need to understand exactly what essential tremor is, why it had not responded to medication, and what DBS could realistically achieve.

Why This Approach Was Chosen

Four medications had been tried at therapeutic doses over eight years with insufficient benefit. This firmly met the definition of medication-refractory essential tremor. DaTscan was normal, excluding Parkinson’s disease as the cause of the tremor a critical distinction in movement disorder diagnosis, because the surgical target and expected outcomes differ between essential tremor and Parkinson’s tremor. For essential tremor, the ventral intermedius nucleus (Vim) of the thalamus is the established and highly effective DBS target. Bilateral implantation was planned given the severity of tremor in both hands and the bilateral functional demands of the patient’s work.

“Essential tremor and Parkinson’s tremor are not the same condition, and they are not treated the same way. When a patient has tried every appropriate medication and the tremor is still destroying their ability to work and live independently, DBS is not a last resort — it is the right next step. The Vim nucleus is one of the most reliable targets in all of functional neurosurgery. When the diagnosis is correct and the patient is properly selected, the results are consistently excellent.” — Dr. Guruprasad Hosurkar. More on our movement disorders treatment in Bangalore page.

Treatment Facts