Medical

clonus

Also found in: Dictionary, Encyclopedia, Wikipedia.

clonus

 [klo´nus]
1. alternate involuntary muscular contraction and relaxation in rapid succession.
2. a continuous rhythmic reflex tremor initiated by the spinal cord below an area of spinal cord injury, set in motion by reflex testing.
ankle clonus (foot clonus) a series of abnormal reflex movements of the foot, induced by sudden dorsiflexion, causing alternate contraction and relaxation of the triceps surae muscle.
toe clonus abnormal rhythmic contraction of the great toe, induced by sudden passive extension of its first phalanx.
wrist clonus spasmodic contraction of the hand muscles, induced by forcibly extending the hand at the wrist.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.

clo·nus

(klō'nŭs),
A form of movement marked by contractions and relaxations of a muscle, occurring in rapid succession seen with, among other conditions, spasticity and some seizure disorders.
See also: contraction.
[G. klonos, a tumult]
Farlex Partner Medical Dictionary © Farlex 2012

clonus

(klō′nəs)
n. pl. clo·nuses
An abnormality in neuromuscular activity characterized by rapidly alternating muscular contraction and relaxation.
clon′ic (klŏn′ĭk, klō′nĭk) adj.
clo·nic′i·ty (klō-nĭs′ĭ-tē, klŏ-), clo′nism (klō′nĭz′əm, klŏn′ĭz′əm) n.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.

clonus

Neurology
1. A volley of muscle contractions and relaxations, occurring in rapid succession.
2. An abrupt transient muscle contraction.
McGraw-Hill Concise Dictionary of Modern Medicine. © 2002 by The McGraw-Hill Companies, Inc.

clo·nus

(klō'nŭs)
A form of movement marked by contractions and relaxations of a muscle, occurring in rapid succession; seen with, among other conditions, spasticity, and some seizure disorders.
See also: contraction
Synonym(s): clonospasm.
[G. klonos, a tumult]
Medical Dictionary for the Health Professions and Nursing © Farlex 2012

clonus

Repetitive contraction and relaxation of stretched muscles which have been deprived of the smoothing and controlling influence of higher centres in the nervous system, in conditions such as STROKE. A feature of an ‘upper motor neurone lesion’. Clonus is also a feature of GRAND MAL epilepsy.
Collins Dictionary of Medicine © Robert M. Youngson 2004, 2005

clo·nus

(klō'nŭs)
A form of movement marked by contractions and relaxations of a muscle, occurring in rapid succession seen with, among other conditions, spasticity and some seizure disorders.
[G. klonos, a tumult]
Medical Dictionary for the Dental Professions © Farlex 2012
Mentioned in
References in periodicals archive
* Recognize the clinical manifestations of serotonin syndrome, which may include agitation, diaphoresis, hyperthermia, hyperreflexia, and clonus.
Serotonin syndrome: How to keep your patients safe
[1] In a long-term follow-up study of phenol block of the tibial nerve by Petrillo et al, 92 tibial nerve blocks with phenol were performed in 59 patients for treatment of severe spasticity of foot and it was observed that the Achilles tendon reflexes was abolished, ankle clonus eliminated and resistance to passive stretch was reduced following the procedure in all patients.
EFFECTIVENESS OF PHENOL BLOCK IN THE MANAGEMENT OF SPASTICITY IN HEMIPLEGIA--A NON-RANDOMISED CONTROLLED TRIAL
Within two weeks after starting sertraline, the woman showed numerous signs of serotonin toxicity: hypertension, tachycardia, anxiety, profuse sweating, bilateral ocular clonus, ankle clonus in the lower extremities, rhythmic jaw motions, and stuttering.
Garcinia cambogia
Manca et al (9) compared botulinum toxins and phenol nerve blocks to reduce ankle clonus in spastic paresis and concluded that both patient groups showed significant clonus reduction over time with the phenol group effect greater than the botulinum toxins group.
Combined Botulinum Toxin Injections and Phenol Nerve / Motor Point Blocks to Manage Multifocal Spasticity in Adults
To date, no clinical study of tramadol-induced clonus is available, although there have been similar studies within the field.
A Study of the Importance of Clonus Symptoms in Patients with Tramadol Poisoning
Neurologic examination was limited but the patient had normal extremity tone, hyporeflexia was noted in biceps, triceps, knees, and ankles bilaterally, clonus was absent, and normal bilateral Babinski reflexes were noted.
A Case of MDMA-Associated Cerebral and Pulmonary Edema Requiring ECMO
There was hypertonia of both lower limbs and sustained bilateral ankle clonus was elicited.
Hirayama Disease: A Rare Disease with Unusual Features
According to the severity of mice with epileptic seizures, the manifestations were classified into 5 levels: (1) twitching of facial muscle; (2) nodding of head; (3) unilateral forelimb with lifting or clonus; (4) bilateral forelimb with clonus as standing; (5) falling as standing or twisting.
Intranasal Delivery of miR-146a Mimics Delayed Seizure Onset in the Lithium-Pilocarpine Mouse Model
Physical examination revealed negativism, intermittent rigidity, and generalised hyperreflexia, but no clonus, autonomic dysfunction, diaphoresis, or fevers.
The Treatment of Clozapine-Withdrawal Delirium with Electroconvulsive Therapy
During the first several days of inpatient admission, she experienced progressive bilateral extremity clonus, hyperreflexia, and urinary retention.
Anti-NMDA receptor encephalomyelitis
Copyright © 2003-2025 Farlex, Inc Disclaimer
All content on this website, including dictionary, thesaurus, literature, geography, and other reference data is for informational purposes only. This information should not be considered complete, up to date, and is not intended to be used in place of a visit, consultation, or advice of a legal, medical, or any other professional.