Table 1.
The key features of Parkinsonian tremor, dystonia tremor and essential tremor.
| Key Features | Parkinsonian Tremor | Dystonia Tremor | Essential Tremor |
|---|---|---|---|
| Frequency | 4–6 Hz | 7 Hz | 4–8 Hz |
| Amplitude | Regular | Irregular | Regular |
| Symmetry | Asymmetrical | Asymmetrical | Symmetrical |
| Topography | Hands > other | Head > hands > others | Hands > head > voice > others |
| Potential accompanying sign | Bradykinesia, rigidity | Dystonic posture | Impaired tandem gait |
| Suppression of tremor during movement onset | In most cases | Rare | Not found |
| Activation condition | Rest > postural/kinetic | Postural > kinetic > rest | Postural > kinetic > rest |
| Sensory tricks | No | Yes | No |
| Handwriting | Micrographia | Macrographia | Large angulated loops |
| Decreased arm swing | Yes | May be in dystonic limb | No |