Tremor overview: Difference between revisions

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*[[Neuroimaging]] using [[CT scan]] may help determine if the tremor is the result of a structural defect or degeneration of the brain.
*[[Neuroimaging]] using [[CT scan]] may help determine if the tremor is the result of a structural defect or degeneration of the brain.
*[[CT scan]] can be used to diagnoses [[cerebellar]] cause of tremor or can identify [[stroke]], [[multiple sclerosis]], [[Wilsons disease]].
*[[CT scan]] can be used to diagnoses [[cerebellar]] cause of tremor or can identify [[stroke]], [[multiple sclerosis]], [[Wilsons disease]].
*[[SPECT]] of the [[nigrostriatal]] [[dopaminergic]] system can help distinguish essential and [[dystonic]] tremors in [[Parkinson's disease]] from [[neurodegenerative]] [[Parkinson's disease]].


==References==
==References==
{{Reflist|2}}
{{Reflist|2}}

Revision as of 02:34, 27 January 2021

Tremor Microchapters

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Overview

Historical Perspective

Classification

Pathophysiology

Causes

Differentiating Tremor from other Diseases

Epidemiology and Demographics

Risk Factors

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Natural History, Complications and Prognosis

Diagnosis

Diagnostic Study of Choice

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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1] Associate Editor(s)-in-Chief: Zehra Malik, M.B.B.S[2]

Overview

Tremor is an unintentional, somewhat rhythmic, muscle movement involving to-and-fro movements (oscillations) of one or more parts of the body. It is the most common of all involuntary movements and can affect the hands, arms, head, face, vocal cords, trunk, and legs. Most tremors occur in the hands. In some people, tremor is a symptom of another neurological disorder. The most common form of tremor, however, occurs in otherwise healthy people.

Historical Perspective

James Parkinson, identified the tremor as "involuntary tremulous motion in parts not in action," in his essay on the shaking palsy, in 1817.

Classification

Tremor may be classified into resting or action tremor. Action tremor includes postural, kinetic (simple or intentional), isometric and task-specific tremor.

Pathophysiology

It is thought that tremor is the result of a combination of different mechanisms that could result in oscillatory/rhythmic movement. These mechanisms are mechanical oscillations, reflex oscillations, central oscillations, and cerebellar oscillation. These mechanisms differ on the basis of their origin. Mechanical oscillations occurs in limbs, could be limited to a particular joint, reflex oscillations originates from afferent muscle spindles, central neuronal pacemaker involves thalamus, basal ganglia, inferior olive, and cerebellar oscillations are due to disturbances in feedforward or feedback loops in cerebellum.

Causes

Common causes of tremor in primary care include enhanced physiologic tremor, essential tremor, and Parkinson’s disease. Other causes are caffeine intake, excessive alcohol, hypoglycemia, stress, anxiety, depression, fatigue, Wilson's disease, hyperthyroidism, multiple sclerosis, normal aging.

Differentiating Tremor from other Diseases

Tremor must be differentiated from diseases that cause involuntary movement: myoclonus, clonus, asterixis, and epilepsia partialis continua. The cause of tremor must also be differentiated from other conditions that cause tremor: essential tremor, physiological tremor, Parkinson's disease, cerebellar tremor, orthostatic tremor.

Epidemiology and Demographics

Risk Factors

Common risk factors include:

Screening

There is insufficient evidence to recommend routine screening for tremor.

Natural History, Complications and Prognosis

Diagnosis

Diagnostic Study of Choice

History and Symptoms

  • Tremor is the most common involuntary movement disorder. in the primary care setting the most common causes of tremors are essential tremors, Parkinson's disease and enhanced physiologic tremor.

Physical Examination

Laboratory Findings

Electrocardiogram

X-ray

  • There are no x-ray findings associated with tremor.

Echocardiography and Ultrasound

CT

References