Objective: To investigate the retinal nerve fiber layer (RNFL) thickness in essential tremor (ET). Methods: Twenty-seven eyes of 27 patients with essential tremor were included in this study. Twentyseven eyes of 27 healthy volunteers served as controls. All eyes were examined with spectral domain optical coherence tomography (OCT) (Retinascan Advanced RS-3000; NIDEK, Gamagori, Japan) using image filling software program (NAVIS-EX, NIDEK, Tokyo, Japan). Results: No statistically significant difference was detected between ET patients and control group for overall (RNFL) and foveal retinal thickness parameters. [RNFL thickness (Average thickness p=0.86, superior average p=0.22, inferior average p=0.24, nasal average p=0.06, temporal average p=0.88), foveal retinal thickness p=0.63] There was no relationship between OCT parameters and age, gender and duration of ET (all p>0.05). Conclusion: We did not find altered RNFL and foveal thickness values in patients with ET compared to controls. Retinal thickness changes do not seem to be a potentially useful biomarker in ET patients.
Essential Tremor

No abstract available.
Dystonia* ; Essential Tremor* ; Tremor*

Essential Tremor ; Humans ; Pedigree

No abstract available.
DNA, Mitochondrial* ; Essential Tremor* ; Humans

Primary writing tremor is considered to be a task-specific tremor occurring when handwriting. We describe the clinical and electrophysiological features of 5 patients. Two of the patients had a family history of the tremor. Alcohol was effective in reducing the tremor in 3 of the patients. Two patients showed a co-contraction and three alternate contractions between agonist and antagonist muscles. The frequency of the tremors was 5 to 6 Hz. Primidone and propranolol were effective in reducing tremor. Considering the clinical and electrophysiological features, it is suggested that primary writing tremor might be a variant of essential tremor. (J Korean Neurol Assoc 19(1):52~55, 2001
Essential Tremor ; Handwriting ; Humans ; Muscles ; Primidone ; Propranolol ; Tremor* ; Writing*

No abstract available.
DNA, Mitochondrial* ; Essential Tremor* ; Humans ; Parkinson Disease*

Adult ; Essential Tremor ; genetics ; Female ; Humans ; Male ; Middle Aged ; Pedigree

Adult ; Essential Tremor ; diagnosis ; Female ; Humans ; Male ; Pedigree

Stereotactic ventrolateral thalamotomy has been successful in treating a wide spectrum of involuntary movement disorders. But very little has been reported concerning their application in essential tremor. Twenty three patients with medically refractory disabling essential tremor underwent ventralis(VL) thalamotomies. The procedure was unilateral in twenty three cases. Contralateral tremor remained abscent or markedly reduced in 22 patients at the time of the most recent follow-up examinations at a mean of 2.9 months after surgery. Disability was determined by a modified form of an estabilished rating scale for termor reported by Fahn and was reduced from a mean score of 11 to 3(p<0.0001) after the operation. Persistent surgical morbidity was limited to three patients with mild dysarthria and two with a mild cognitive impairment. There were no surgically related deaths. It is concluded that stereotactic VL thalamotomy is a treatment option for medically intractable disabling essential tremor.
Dysarthria ; Dyskinesias ; Essential Tremor* ; Follow-Up Studies ; Humans ; Mild Cognitive Impairment ; Movement Disorders ; Tremor

Dystonia is a disorder of movement caused by involuntary, sustained muscle contractions affecting one or more sites of body, frequently causing twisting and repetitive movements, or postures. Dystonic movements and postures can produce a wide range of clinical presentations. Some distinguishing clinical features of dystonia can help the appropriate diagnosis of primary dystonia. The direction of contraction is almost consistent. Action dystonia and occupational dystonia are related to a movement or task-specific movement, respectively. Sensory tricks or gestes antagonistes are usually seen in patients with dystonia. Two types of tremors can be seen in patients with dystonia: a postural and/or action tremor that resembles essential tremor and a rhythmic expression of dystonic tremor. Sometimes dystonic tremor appears to be less regular and can be associated with myoclonus. Onset age of dystonia, body distribution and etiologies are important to correct diagnosis of primary dystonia. It is well known that the age of onset has important prognostic implications. This article highlights general concepts of phenomenology, classification that are relevant for the purpose a clinical diagnosis.
Age of Onset ; Classification ; Diagnosis ; Dystonia ; Dystonic Disorders* ; Essential Tremor ; Humans ; Muscle Contraction ; Myoclonus ; Posture ; Tremor