Fast orthostatic tremor in Parkinson's disease mimicking primary orthostatic tremor

@article{Apartis2001FastOT,
  title={Fast orthostatic tremor in Parkinson's disease mimicking primary orthostatic tremor},
  author={Emmanuelle Apartis and Francois Tison and Pierre Arn{\'e} and C. Pierre Jedynak and Marie Vidailhet},
  journal={Movement Disorders},
  year={2001},
  volume={16}
}
Leg tremor during standing is a rare feature in idiopathic Parkinson's disease (PD). Tremor during standing usually has a low frequency (range, 4–6 Hz), similar to PD rest tremor frequency, and is improved by levodopa. We describe three cases of fast orthostatic tremor (FoT) of legs and trunk mimicking primary orthostatic tremor (OT) in patients treated with levodopa for PD. Asymmetrical akinetorigid syndrome was accompanied by a rest tremor in two cases. We obtained electrophysiological… 
Unilateral Pseudo-Orthostatic Tremor Provoked by a Remote Limb Movement in Parkinson’s Disease
TLDR
A rare case of PD is reported in a patient whose disease initiated with a unilateral OT that had overlapping features of pseudo-OT and parkinsonism, which is rarely observed in association with PD.
Orthostatic tremor - a review.
Myoclonus or tremor in orthostatism: An under‐recognized cause of unsteadiness in Parkinson's disease
TLDR
Observations show the usefulness of neurophysiological investigations for diagnosing and treating unexplained unsteadiness in Parkinson's disease, and patients with slow tremor and myoclonus improved on levodopa and sometimes benefited further when clonazepam was added.
Unilateral Standing Leg Tremor as the Initial Manifestation of Parkinson Disease
TLDR
It appears that progression might be slow if PD patients have standing leg tremor as the initial manifestation, and one form is high frequency, similar to the primary orthostatic tremor and the other is low frequency andSimilar to the parkinsonian resting tremor.
Clinical and neurophysiologic spectrum of orthostatic tremor: Case series of 26 subjects
TLDR
The main findings included 13.0 to 18.6 Hz leg tremors while standing with varied patterns of phase relationships between the antagonists of the ipsilateral leg and between the homologous muscles of the contralateral leg, short latency tremor onset upon standing with abrupt cessation after sitting, and sense of unsteadiness without actual falls.
[Orthostatic tremor causing postural instability in Parkinson disease: report of one case].
TLDR
A 67-year-old female with orthostatic tremor who was treated with increasing doses of clonazepam, reaching 2 mg/day, and levodopa showed an improvement of postural instability with a good response of parkinsonian symptoms.
Primary orthostatic tremor is an exaggeration of a physiological response to instability
TLDR
EMG data indicate the existence of a physiological system involved in organising postural responses under circumstances of imbalance and characterised by a highly synchronised output at approximately 16 Hz, and suggest that the core abnormality in POT may be an exaggerated sense of unsteadiness when standing still, which then elicits activity from a 16‐Hz oscillator normally engaged in postural responding.
Dopa Responsive Slow Orthostatic Tremor in Parkinson’s Disease
TLDR
A Parkinson's disease patient with levodopa responsive slow OT showed abnormal movements of more regular rhythms and stable frequency on both legs on standing and these symptoms were aggravated at off state and improved by increasinglevodopa.
Orthostatic tremor: a review of 45 cases.
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