منابع مشابه
Ankle clonus
Clonus is a series of involuntary, rhythmic, muscular contractions, and relaxations. It may be caused by interruption of the upper motor neuron fibers such as stroke, multiple sclerosis, or by metabolic alterations such as severe hepatic failure or serotonin syndrome. We present a video case of impressive left ankle clonus in a patient with old right middle cerebral artery stroke.
متن کاملClonus: definition, mechanism, treatment.
Clonus is involuntary and rhythmic muscle contractions caused by a permanent lesion in descending motor neurons. Clonus may be found at the ankle, patella, triceps surae, wrist, jaw, biceps brachii. In general, clonus may occur in any muscle with a frequency of 5-8 Hz and the average period of oscillations of the ankle clonus is approximately 160-200 ms. Plantar flexion (PF) comprises 45% of th...
متن کاملMotor unit behavior during clonus.
Medial gastrocnemius surface electromyographic activity and intramuscular electromyographic activity were recorded from six individuals with chronic cervical spinal cord injury to document the recruitment order of motor units during clonus. Four subjects induced clonus that lasted up to 30 s while two subjects induced clonus that they actively stopped after 1 min. Mean clonus frequency in diffe...
متن کاملPatellar clonus: an autonomous central generator.
The mechanisms underlying clonus are considered in relation to current theories. By the use of a lever attached to a printed motor forces have been applied to the upper edge of the patella, a steady stretching force in suitable hemiplegic patients started the clonic oscillations. With rhythmic forces it has been found that the underlying rhythm is very resistant to entrainment. The oscillation ...
متن کاملClonus Associated with Tropical Spastic Paraparesis.
A 53-year-old woman with tropical spastic paraparesis (also called human T-lymphotropic virus–associated myelopathy) reported several months of worsening weakness of the legs and feet, which had led to her use of a wheelchair. On examination, she was found to have severe spasticity and weakness of both legs and feet, bilateral Babinski sign, and bilateral patellar clonus (see video). The result...
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ژورنال
عنوان ژورنال: Neurology: Clinical Practice
سال: 2018
ISSN: 2163-0402,2163-0933
DOI: 10.1212/cpj.0000000000000558