Electrophysiologic characteristics of tremor in Parkinson's disease and essential tremor.

UNLABELLED: Tremor in essential tremor (ET) and Parkinson's disease (PD) usually present specific electrophysiologic profiles, however amplitude and frequency may have wide variations.

OBJECTIVE

To present the electrophysiologic findings in PD and ET.

METHOD: Patients were assessed at rest, with posture and action. Seventeen patients with ET and 62 with PD were included. PD cases were clustered into three groups: predominant rest tremor; tremor with similar intensity at rest, posture and during kinetic task; and predominant kinetic tremor.

RESULTS

Patients with PD presented tremors with average frequency of 5.29±1.18 Hz at rest, 5.79±1.39 Hz with posture and 6.48±1.34 Hz with the kinetic task. Tremor in ET presented with an average frequency of 5.97±1.1 Hz at rest, 6.18±1 Hz with posture and 6.53±1.2 Hz with kinetic task. Seven (41.2%) also showed rest tremor.

CONCLUSION

The tremor analysis alone using the methodology described here, is not sufficient to differentiate tremor in ET and PD.