Causes of clonus and hyperreflexia

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Hyperreflexia and Clonus. Any knowledge out there?

causes of clonus and hyperreflexia

Hyperreflexia, clonus and positive Hoffman's sign

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NCBI Bookshelf. Barret Zimmerman ; John B. Authors Barret Zimmerman 1 ; John B. Hubbard 2. It can be evaluated in many joints but is most commonly seen in the ankle joint by briskly dorsiflexing the foot. An illustrative example of what clonus might look like is a clinician tapping the patellar tendon once lightly and a subsequent series of obvious repeated knee extensions and relaxations going on for a dozen beats. The test is free of cost, generally requires no equipment and can be performed rapidly and easily in a hospitalized patient.

Based outside Boston, Jennifer Markowitz received her M. She is board-certified in Pediatric Neurology and Neuromuscular Medicine. Her writing and presentations have focused on both scientific and patient audiences. When doctors check reflexes, they don't always get a normal response. Clonus, a type of hyperactive reflex, is a rhythmic response to reflex testing. Instead of just one movement, a series of repetitive reflex movements are observed. Clonus reveals a problem with the nerve cells in the brain that control movement, or the wires that they send down through the spinal cord.

Oxford University Press makes no representation, express or implied, that the drug dosages in this book are correct. Readers must therefore always check the product information and clinical procedures with the most up to date published product information and data sheets provided by the manufacturers and the most recent codes of conduct and safety regulations. The authors and the publishers do not accept responsibility or legal liability for any errors in the text or for the misuse or misapplication of material in this work. Except where otherwise stated, drug dosages and recommendations are for the non-pregnant adult who is not breastfeeding. Hyperactive deep tendon reflexes area sign of upper motor neuron lesion.

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What is clonus? Everything you need to know

Causes of Clonus

Clonus is a type of neurological condition that creates involuntary muscle contractions. This results in uncontrollable, rhythmic, shaking movements. People who experience clonus report repeated contractions that occur rapidly. Clonus primarily occurs in muscles that control the knees and ankles. The exact cause of clonus is not fully understood. There is usually a problem with the electrical pathway involved in muscle movement. In some cases, liver or kidney failure can also lead to clonus due to the buildup of waste products within the body.

Assessment - Reflex Exam - Triceps Reflex Exam Comparing Normal with Hyperreflexia

Clonus is a rhythmic, oscillating, stretch reflex, the cause of which is not neurons and therefore is generally accompanied by hyperreflexia.
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4 thoughts on “Causes of clonus and hyperreflexia

  1. Clonus is a type of neurological condition that creates involuntary muscle contractions. Clonus primarily occurs in muscles that control the knees and ankles. Spasticity, as seen in clonus, is caused by damaged nerves among the brain, spinal cord, and muscles.

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