Parkinson Disease vs Essential Tremor
Parkinson Disease and Essential Tremor are easy to mix up on the boards. Here's a side-by-side comparison — presentation, workup, imaging, and first-line treatment — drawn from our full outlines.
Parkinson Disease vs Essential Tremor at a glance
- Parkinson Disease: Progressive neurodegenerative movement disorder from nigrostriatal dopamine loss.
- Essential Tremor: Bilateral, largely symmetric postural and kinetic tremor of the hands; the most common adult movement disorder.
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Side-by-side comparison
| Feature | Parkinson Disease | Essential Tremor |
|---|---|---|
| At a glance | Progressive neurodegenerative movement disorder from nigrostriatal dopamine loss. | Bilateral, largely symmetric postural and kinetic tremor of the hands; the most common adult movement disorder. |
| Classic presentation | Asymmetric rest tremor + bradykinesia + cogwheel rigidity with excellent response to levodopa is highly suggestive.; Motor: rest tremor (typically asymmetric,… | Bilateral symmetric hand tremor present with action and posture, absent at rest, often with positive family history and alcohol responsiveness.; Hand tremor… |
| Workup / key labs | MDS clinical diagnostic criteria: bradykinesia plus rest tremor and/or rigidity; supported by clear levodopa response, levodopa-induced dyskinesia, rest… | MDS 2018: isolated tremor syndrome of bilateral upper limb action tremor for ≥3 years, ± other locations, without other neurologic signs.; TSH to exclude… |
| Imaging | MRI brain — usually normal in PD; helps exclude vascular disease, NPH, atypical parkinsonism; DaTscan (123I-ioflupane SPECT) — shows reduced striatal dopamine… | Brain imaging not routinely required — order MRI only if focal findings or atypical features; DaTscan SPECT can distinguish ET from PD when uncertain (normal… |
| First-line treatment | Levodopa/carbidopa — most effective symptomatic therapy; carbidopa inhibits peripheral DOPA decarboxylase to reduce nausea and increase central availability;… | Propranolol 60-320 mg/day (non-selective beta-blocker) — first-line, may need long-acting formulation; contraindicated in asthma, severe bradycardia,… |
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