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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)
Anxiety
Depression
Normal DAT scan
Cerebello-thalamocortical structural and functional abnormalities
Unsteadiness while standing Social phobia
(Self-withdrawal)
 
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