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Table 1 Characteristics of primary orthostatic tremor

From: Lessons I have learned from my patients: everyday life with primary orthostatic tremor

Motor features Non motor features Electrophysiological & neuro-imaging findings
Lower body tremor activated on standing position Fear of falling Tremor frequency 13–18 Hz (high inter-muscular coherence)
Tremor absent when sitting and lying Pain Brain neuroimaging (MRI) normal range
Primarily affects the legs and trunk
(Tremor may be observed in the shoulders/arms while the patient is presses the hands on a table to support himself/herself)
Normal DAT scan
Cerebello-thalamocortical structural and functional abnormalities
Unsteadiness while standing Social phobia
Urge to search support to feel stable   
Worsening over time (same tremor frequency, increased amplitude)
Arm postural tremor (6–8Hz)
Alteration of attention, executive function, visuospatial ability, & visual memory (>60 y.o.)  
  1. MRI magnetic resonance imaging, DAT scan dopamine transporter imaging, y.o. years-old