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Myoclonic Jerking



  • His family history was negative for movement disorders and seizures, and the child presented a normal neurological development and had no past history of neurological illness.[movementdisorders.org]
  • Presentation Of CaseA fifty-four-year-old man was brought to the hospital because of an episode of shaking.He had been well except for the presence of multiple neurofibromatosis since the age of fourteen years.[nejm.org]
  • The symptoms can vary in intensity and frequency, and may be localized to one body part or be present all over the body. Severe myoclonus can interfere with a person’s ability to walk, talk or eat.[innerbody.com]
  • These forms of myoclonus occur in healthy people and rarely present a problem. Other forms of myoclonus may occur because of a nervous system (neurological) disorder, such as epilepsy, a metabolic condition, or a reaction to a medication.[mayoclinic.org]
Heart Block
  • block and focal segmental glomerulosclerosis OCRL Dent disease, Lowe syndrome OFD1 Joubert syndrome, Orofaciodigital syndrome, Retinitis pigmentosa, Simpson-Golabi-Behmel syndrome OPHN1 Mental retardation, with cerebellar hypoplasia and distinctive facial[genda.com.ar]
  • […] may involve the scalp, face, and neck; hoarseness; absence of auricular lesions has been reported; progressive dementia; extensive frontal white matter change; myoclonus; ataxia; facial paralysis; tinnitus; hearing loss; hyperacusis; vertigo; dysgeusia[esanatos.com]
Restless Legs Syndrome
  • Also known as a hypnic jerk or hypnagogic jerk, Sleep myoclonus will rarely disturb the subject or bed partner to the point of waking and disrupting sleep, but may indicate the presence of sleep related findings or disorders such as restless legs syndrome[sleepassociation.org]
  • These include periodic limb movement disorder (PLMD) and restless leg syndrome (RLS). PLMD may be related to issues with your nervous system; research, however, has yet to find that it indicates any serious abnormalities.[universityhealthnews.com]
  • Myoclonus types Essential myoclonus Idiopathic/non-progressive, eg restless legs syndrome Physiologic myoclonus Associated with sleep jerks and hiccups Epileptic myoclonus Associated with epilepsy and Symptomatic myoclonus Associated with encephalopathy[medical-dictionary.thefreedictionary.com]
  • A similar study found a 19% prevalence of periodic limb movements of sleep in a sample of congestive heart failure outpatients Restless leg syndrome is less common, affecting only 5% of the population.[tuck.com]
  • So can diabetes, arthritis, and thyroid disease. Peripheral artery disease (PAD) , a condition characterized by narrowed blood vessels in the legs, can sometimes cause nighttime leg twitches. Even pregnancy can trigger twitching while sleeping.[universityhealthnews.com]
Myoclonic Jerking
  • NOS , MYOCLONIC JERKS , myoclonus (physical finding) , myoclonus , myoclonus was seen , Myoclonic jerks , Jerk, Myoclonic , Jerks, Myoclonic , Myoclonic Jerk , Myoclonic Jerks , Myoclonus [Disease/Finding] , myoclonic disorder , myoclonic jerking , involuntary[fpnotebook.com]
  • Local trauma, or other types of injury to the brain, spinal cord, or peripheral nerves can lead to focal myoclonic jerks.[cmdg.org]
  • After administration of ibuprofen, body temperature dropped and myoclonic jerks completely disappeared.[movementdisorders.org]
  • If the disturbance persists, generalized myoclonic jerks and, ultimately, seizures may occur. Diagnosis Diagnosis of myoclonus is clinical. Testing is done based on clinically suspected causes.[merckmanuals.com]
  • Myoclonic jerks are severe with grand mal seizures.[medical-dictionary.thefreedictionary.com]
Drop Attacks
  • Other seizure types such as tonic-clonic , atonic (drop attacks) and typical absence seizures can happen in about 2 out of every 3 children with this syndrome.[epilepsy.org.uk]
  • NOTE: Myoclonic seizures are one type of seizure that can result in a "drop attack" (also known as astatic seizure), other causes of drop attacks include tonic, atonic and myoclonic-atonic seizures.[medlink.com]
  • Others are in development Drop Attacks Post-Concussion Syndrome Other Symptoms Visual Symptoms All material on this site is copyright of Dr Jon Stone unless specifically stated otherwise.[neurosymptoms.org]
  • Atonic seizures are also sometimes referred to as “drop seizures” or “drop attacks”.[efmny.org]
  • Atonic (also called a drop attack) : Atonic seizures cause loss of muscle tone. In fact, Atonic literally means “without tone” so the muscles become weak.[efepa.org]
Involuntary Movements
  • movement caused by muscle contraction (positive myoclonus) or atonia (negative myoclonus), often called “jerk,” “shake,” or “spasm” by patients and inexpert observers.[movementdisorders.org]
  • Involuntary movements compose a group of uncontrolled movements that may manifest as a tremor, tic, myoclonic jerk, chorea, athetosis, dystonia or hemiballism.[stanfordmedicine25.stanford.edu]
  • Scientists are seeking to understand the underlying biochemical basis of involuntary movements and to find the most effective treatment for myoclonus and other movement disorders.[ninds.nih.gov]
  • movements unassociated with loss of consciousness.”[medlink.com]
  • On the day of admission the patient was found lying on the floor of his apartment; he was tremulous and appeared confused. He denied . . .[nejm.org]
  • Myoclonus is a mixture of small- and larger-amplitude muscle jerks, giving rise to a tremulous appearance. Myoclonus is primarily action-induced, but in severe cases is present at rest.[epilepsydiagnosis.org]


  • In this article, the author details the historical aspects, nomenclature, classification, clinical manifestations, pathophysiology, diagnostic workup, differential diagnosis, and management of the various types of myoclonic seizure, paying particular[medlink.com]
Generalized Polyspikes
  • “Electrographically they were time locked with generalized polyspikes on the EEG record,” wrote the authors. “A seizure disorder of generalized myoclonic epilepsy was diagnosed and she was started on valproic acid (depakote).[neurologyadvisor.com]


  • Physiological myoclonus This type of myoclonus occurs in normal, healthy people and rarely needs treatment.[mayoclinic.org]
  • Each chapter includes diagnostic and treatment algorithms to guide practitioners in clinical decision making.[books.google.com]
  • […] the main line of treatment.[en.wikipedia.org]
  • Doctors try to identify the underlying cause of the myoclonus, which helps to determine the most appropriate and effective treatment. Physiological myoclonus occurs in healthy people and rarely requires medical treatment.[innerbody.com]


  • Myoclonic status epilepticus prognosis is extremely poor In the largest published series of post-hypoxic MSE, Wijdicks and colleagues found that all 40 patients had intermittent generalized myoclonus involving both face and limb muscles.[lifeinthefastlane.com]
  • Long-term prognosis for symptomatic (secondarily) generalized epilepsies: a population-based study. Epilepsia. 2007;48(6):1128-32. Abraham A, Elena C, Melamed E, Djaldetti R. Successful treatment of truncal myoclonus.[rarediseases.org]
  • However, the prognosis for more simple forms of myoclonus in otherwise healthy individuals may be neutral, as the disease may cause few to no difficulties.[en.wikipedia.org]
  • Complete a bedside mini-mental assessment. c) Assess hydration status. d) Estimate prognosis. Hours, days, weeks, months or years? A longer prognosis demands a more definitive change in treatment.[mywhatever.com]
  • Opsoclonus-myoclonus syndrome: a new era of improved prognosis? Pediatr Neurol . 2017;72:65-9. Jankovic, J. Therapeutic developments for tics and myoclonus. Mov Disord. 2015;30(11):8. Jankovic J, Shannon KM. Movement disorders.[bcm.edu]


  • The world’s foremost experts describe the phenotypes and subtypes of myoclonic epilepsies and the underlying molecular defects and summarize cutting-edge advances in molecular genetics that shed new light on the etiologies of these syndromes.[books.google.com]
  • Applicable To Drug-induced myoclonus Palatal myoclonus Use Additional Use Additional Help Certain conditions have both an underlying etiology and multiple body system manifestations due to the underlying etiology.[icd10data.com]
  • [myo- G. klonos, tumult] myoclonus /my·oc·lo·nus/ ( mi-ok lo-nus ) shocklike contractions of a muscle or a group of muscles.myoclon ic essential myoclonus myoclonus of unknown etiology, involving one or more muscles and elicited by excitement or an attempt[medical-dictionary.thefreedictionary.com]
  • The 2 main classification systems of myoclonus are based on etiology and physiology.[medlink.com]
  • Myoclonus can also be classified by etiology (the underlying cause), which is described in more detail below. Physiologic Myoclonus This type of myoclonus occurs in healthy people and rarely requires treatment.[bcm.edu]


  • Epidemiology studies of periodic limb movements A high prevalence of periodic limb movements was found in elderly women according to an observational study from 2006 in the Journal of Clinical Sleep Medicine.[tuck.com]
  • He has since completed further training in emergency medicine, clinical toxicology, clinical epidemiology and health professional education.[lifeinthefastlane.com]
Sex distribution
Age distribution


  • Overview Myoclonic seizures are sudden, brief, involuntary, single or multiple jerks that are isolated or rapidly repetitive and of variable topography and pathophysiology.[medlink.com]
  • Pathophysiology and treatment of opioid-related myoclonus in cancer patients. Pain 1998; 74: 5-9. Smith M. Neuroexcitatory effects of morphine and hydromorphone: evidence implicating the 3-glucuronide metabolites.[mywhatever.com]
  • The nosology and pathophysiology of myoclonus. Mov Disord 1982:196–248. Google Scholar 2. Fahn S, Marsden CD, Van Woert MH. Definition and classification of myoclonus. Adv Neurol 1986; 43:1–5. PubMed Google Scholar 3. Nirenberg MJ, Frucht SJ.[link.springer.com]
  • Medications unrelated to opioids, such as anticholinergics , are known to cause myoclonic jerks. [9] Pathophysiology [ edit ] Most myoclonus is caused by a disturbance of the central nervous system . Some are from peripheral nervous system injury.[en.wikipedia.org]
  • Pathophysiology Although some cases of myoclonus are caused by an injury to the peripheral nerves , most myoclonus is caused by a disturbance of the central nervous system .[dictionnaire.sensagent.leparisien.fr]


  • Prevention Prevention will depend on the cause. References: Dalmau J, Rosenfeld MR. Paraneoplastic syndromes of the CNS. Lancet Neurology. 2008;7:327-340. Eberhardt O, Topka H. Myoclonic disorders. Brain Sci. 2017;7(8):E103.[cancercarewny.com]
  • Twitching While Sleeping: Prevention and Treatment If you’re twitching while sleeping, and it’s because of PLMD or RLS, you may be prescribed medications to control your symptoms.[universityhealthnews.com]
  • They slow down your central nervous system and help prevent seizures.[wexnermedical.osu.edu]
  • The relevance of limb movements to stroke has implications for secondary stroke prevention and stroke recovery.[tuck.com]
  • Hospital for Sick Children Health A-Z Search a complete list of child health articles expand_more View All Drug A-Z Search a list of articles about medications expand_more View All Learning Hubs Browse a complete list of content groups Healthy Living & Prevention[aboutkidshealth.ca]

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