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Andersen Tawil syndrome(GeneReviews)

Andersen-Tawil syndrome is a type of long QT syndrome and is also considered a rare form of periodic paralysis. It causes episodes of muscle weakness, changes in heart rhythm (arrhythmia), and developmental abnormalities. Physical abnormalities associated with this condition typically affect the head, face, and limbs From MedlinePlus GeneticsAndersen-Tawil syndrome is a disorder that causes episodes of muscle weakness (periodic paralysis), changes in heart rhythm (arrhythmia), and developmental abnormalities. Periodic paralysis begins early in life, and episodes last from hours to days

Andersen-Tawil syndrome Genetic and Rare Diseases

Andersen Tawil syndrome (Concept Id: C1563715

a single Taiwanese family with Andersen-Tawil syndrome.4 The proband was a 35-year-old woman with typical clinical triad of Andersen-Tawil syndrome and fixed extremity and truncal weakness. In addition, she was also noted to have pyramidal tract signs and majo Andersen-Tawil syndrome also called Andersen syndrome, long QT syndrome 7 or LQTS7, is a rare genetic disorder that causes episodes of muscle weakness (periodic paralysis), changes in heart rhythm (arrhythmia), and developmental abnormalities. Periodic paralysis begins early in life, and episodes last from hours to days

Kir2

Andersen-Tawil syndrome. More than 60 mutations in the KCNJ2 gene have been found to cause Andersen-Tawil syndrome, a disorder characterized by episodes of muscle weakness (periodic paralysis), changes in heart rhythm (arrhythmia), and physical abnormalities affecting the face, other parts of the head, and the limbs. Most of the mutations change a single protein building block (amino acid) in. Andersen-Tawil syndrome (ATS) is a multisystem disorder that primarily involves periodic paralysis (episodic muscle weakness), cardiac arrhythmias, and dysmorphic features. The cardiac arrhythmias are ventricular and may also show prolonged QTc and enlarged U wave on electrocardiogram ( ECG /EKG) GeneReviews: Andersen-Tawil syndrome; Andersen-Tawil syndrome, also called Andersen syndrome and Long QT syndrome 7, is a form of long QT syndrome. [1] It is a rare genetic disorder, and is inherited in an autosomal dominant pattern and predisposes patients to cardiac arrhythmias Andersen-Tawil syndrome (ATS) is characterized by the triad of episodic flaccid muscle weakness, distinctive dysmorphic features, ventricular arrhythmias and prolonged QT interval. Patients with ATS may present to the ER with an attack of muscle weakness or flaccid paralysis and/or cardiac rhythm disturbances or prolonged QT interval (over 0.39. Is a 4 gene panel that includes assessment of non-coding variants. Is ideal for patients with a clinical suspicion of periodic paralysis

Andersen-Tawil syndrome: MedlinePlus Genetic

Statland JM, Tawil R, Venance SL: Andersen-Tawil Syndrome. In GeneReviews. Edited by RA Pagon, MP Adam, HH Ardinger, et al: University of Washington, Seattle. 1993-2018. 2004 Nov 22 (Updated 2015 Sep 3) Presentation. Andersen-Tawil syndrome affects the heart, symptoms are a disruption in the rhythm of the heart's lower chambers (ventricular arrhythmia) in addition to the symptoms of long QT syndrome.There are also physical abnormalities associated with Andersen-Tawil syndrome, these typically affect the head, face, and limbs Andersen-Tawil syndrome (ATS) is characterized by a triad of: episodic flaccid muscle weakness (i.e., periodic paralysis); ventricular arrhythmias and prolonged QT interval; and anomalies including low-set ears, widely spaced eyes, small mandible, fifth-digit clinodactyly, syndactyly, short stature, and scoliosis

Home; Books; Search; Support. How-To Tutorials; Suggestions; Machine Translation Editions; Noahs Archive Project; About Us. Terms and Conditions; Get Published. Introduction. Andersen-Tawil syndrome (ATS), classified as long QT syndrome type 7 (LQT7) is a rare disorder, sporadic or inherited in an autosomal dominant pattern , .The mutations causing ATS are located in KCNJ2 (GenBank Accession No. NM_000891.2), which encodes the α-subunit of the potassium channel Kir2.1 a component of the inward rectifier I K1, a single Taiwanese family with Andersen-Tawil syndrome.4 The proband was a 35-year-old woman with typical clinical triad of Andersen-Tawil syndrome and fixed extremity and truncal weakness. In addition, she was also noted to have pyramidal tract signs and majo

Summary Andersen-Tawil syndrome is a rare genetic disorder characterized by episodes of muscle weakness and paralysis (periodic paralysis); abnormalities affecting the electrical system of the heart that can cause abnormal heart rhythms (arrhythmias); and a variety of distinctive facial and skeletal features. The.. Andersen-Tawil syndrome is a potentially fatal condition. 27-29 In patients with the KCNJ2 gene mutation, ventricular arrhythmias are common (Table 1). 27-29 Cardiac manifestations of Andersen-Tawil syndrome include premature ventricular contractions (PVCs), complex ventricular ectopy (bigeminy, consecutive PVCs, or multifocal PVCs. Andersen-Tawil syndrome is a rare disorder that causes muscle weakness and paralysis, as well as affecting the electrical system of the heart causing abnormal rhythms. This disorder is caused by a mutation in the KCNJ2 gene that disrupts the flow of protein to the muscles. (For more information on this disorder, choose Andersen- Tawil. Introduction. Andersen-Tawil syndrome (ATS), also known as Andersen syndrome and long QT syndrome 7, is a rare channelopathy inherited in an autosomal dominant fashion (1,2).ATS is characterized by the triad of episodic flaccid muscle weakness (periodic paralysis may be hypo-, hyper- or normokalemic); cardiac arrhythmias and dysmorphic features, including low-set ears, hypertelorism, small. Andersen-Tawil syndrome (ATS) is an autosomal dominant, multisystem channelopathy characterized by periodic paralysis, ventricular arrhythmias and distinctive dysmorphic facial or skeletal features. The disorder displays marked intrafamilial variability and incomplete penetrance. Myasthenia gravis (MG) is an autoimmune disorder that demonstrates progressive fatigability, in which the nicotinic.

Andersen - Tawil sindrom , također nazvan Andersenov sindrom i dugi QT sindrom 7 , rijedak je genetski poremećaj koji utječu na nekoliko dijelova tijela. Tri prevladavajuće značajke Andersen-Tawil sindroma uključuju poremećaje električne funkcije srca karakterizirane abnormalnošću uočenom na elektrokardiogramu (dugi QT interval ) i tendencijom ka abnormalni srčani ritmovi. GeneReviews provides current, expert-authored, peer-reviewed, full-text articles describing the application of genetic testing to the diagnosis, management, and genetic counseling of patients with specific inherited conditions. Medscape Reference provides information on this topic. You may need to register to view the medical textbook, but. Although not observed in every affected subject, Andersen-Tawil Syndrome is one of the few diseases that may result in bidirectional VT. References International Journal of Cardiology 2011;148:e13-e15. Circ Arrhythmia Electrophysiol 2008;117:227-233. ECG 1a. Above is the basal ECG of a 12 years old patient with Andersen-Tawil syndrome.. Andersen-Tawil syndrome. ATS is a rare disorder characterised by a triad of periodic paralysis, cardiac defects and skeletal abnormalities, although not every patient will have all three features.182 The periodic paralysis is typically associated with low levels of potassium but can be associated with normokalaemia or hyperkalaemia Andersen-Tawil syndrome (GeneReviews article here) Thyrotoxic periodic paralysis Autoimmune reactions to potassium channels Diseases of oxidative metabolism such as mitochondrial diseases Porphyria . Low potassium caused by foods and drugs: licorice, barium exposure, diuretics, steroids and other

years. Another form of PP, Andersen-Tawil syndrome (ATS), manifests with a triad of clinical features including episodic flaccid muscle weakness, ventricular arrhythmia, and prolonged QT. Serum potassium concentration may be elevated, normal, or reduced during an attack 1. INTRODUCTION. Andersen-Tawil syndrome is a disorder caused by mutation in KCNJ2 or KCNJ5 gene.KCNJ2 encodes the α‐subunit of the potassium channel Kir2.1 responsible for inward rectifier current (I K1) in cardiomyocytes (Statland, Tawil, & Venance, 2004).Mutations in KCNJ5, encoding the G protein‐activated inwardly rectifying potassium channel 4 (Kir3.4), have inhibitory effects on. Background: Andersen-Tawil syndrome (ATS) is a multisystem disorder mainly caused by mutations in KCNJ2 gene which encodes the main pore-forming protein of the inward rectifier K+ channel, Kir2.1. The disease is characterized by ventricular arrhythmias, periodic paralysis, dysmorphic features and specific ECG alterations La ĉi-suba teksto estas aŭtomata traduko de la artikolo Andersen-Tawil syndrome article en la angla Vikipedio, farita per la sistemo GramTrans on 2018-01-04 13:53:31. Eventualaj ŝanĝoj en la angla originalo estos kaptitaj per regulaj retradukoj. Se vi volas enigi tiun artikolon en la originalan Esperanto-Vikipedion, vi povas uzi nian specialan redakt-interfacon

Andersen-Tawil Syndrome is a rare genetic disorder that is frequently associated with developmental, skeletal, and cardiac abnormalities, specifically bidirectional VT. While there are no great recommendations that exist for treatment of ventricular dysrhythmias, we demonstrate a case of clinical improvement in a patient with ATS by using the. El síndrome de Andersen-Tawil , también llamado síndrome de Andersen y síndrome de QT largo 7 , es un trastorno genético poco común que afecta a varias partes del cuerpo. Las tres características predominantes del síndrome de Andersen-Tawil incluyen alteraciones de la función eléctrica del corazón caracterizadas por una anomalía observada en un electrocardiograma (un intervalo QT. Andersen-Tawil syndrome (ATS) is a rare and unique genetic disorder considered as one of the subtypes of long QT syndrome (LQT7) and characterized by a triad of clinical manifestations including periodic paralysis, ventricular arrhythmias and dysmorphic features. From the genetic and molecular point of view, ATS is inherited as an autosomal.

Andersen-Tawil syndrome. Jervell and Lange-Nielson syndrome. Sample Requirements. Specimen: Long QT Syndrome Panel: Reference Lab Test Code: Long QT Syndrome GeneReviews. Website Feedback. Portions ©2021 Mayo Foundation for Medical Education and Research Andersen-Tawil Syndrome (ATS) is a rare muscle channelopathy with distinct features and accounts for an incidence of about 1:500 000.25 The distinguishing features of ATS are the coexistence of the abnormalities in two excitable tissues: skeletal and cardiac muscle. Periodic paralysis in ATS occurs in the setting of either hyperkalemia or. may be part of a multisystemic disorder, such as Jervell and Lange-Nielsen syndrome, Timothy syndrome, Andersen-Tawil syndrome, Naxos disease, Carvajal syndrome and muscular dystrophy.1,12-15 Inheritance Pattern/Genetics: Autosomal Dominant, Autosomal recessive, or X-linked Test Methods [aka *Andersen-Tawil syndrome (ATS); long QT syndrome 7; Andersen cardiodysrhythmic periodic paralysis] 1971 - Andersen et al reported the case of an 8-year-old boy with short of stature, hypertelorism, broad nasal root, mandibular hypoplasia, scaphocephaly, and clinodactyly V, as well as a defect of the soft and hard palate

Characteristics of Andersen-Tawil Syndrome - Full Text

  1. Glycogen storage disease (PDF) Published by UK Blood Transfusion and Tissue Transplantation Services (UKBTS), 01 March 2016. Glycogen storage disease (GSD) is the result of defects in the processing of glycogen synthesis or breakdown within muscles, liver, and other cell types. GSD in humans is genetic, caused by any..
  2. erende træk ved Andersen-Tawil syndrom inkluderer forstyrrelser i den elektriske funktion af hjertet, der er karakteriseret ved en abnormitet set på et elektrokardiogram (et langt QT-interval ) og en tendens til unormale hjerterytmer.
  3. Michael M. Segal MD PhD 1, Karin Jurkat-Rott MD PhD 2, Jacob Levitt MD 3, Frank Lehmann-Horn MD PhD 2 1 SimulConsult Inc., USA 2 University of Ulm, Germany 3 Mt. Sinai Medical Center, New York, USA. Dec 2017. This article focuses on questions that arise about diagnosis and treatment for people with hypokalemic periodic paralysis

Defective Potassium Channel Kir2.1 Trafficking Underlies Andersen-Tawil Syndrome. December 19, 2003 The Journal of Biological Chemistry, 278, 51779-51785. Hoi-Fong C, Meng-Ling C, Jen-Jen S, Li-Chin K, Chin-Hsien L,3 and Ruey-Meei W. A novel neuropsychiatric phenotype of KCNJ2 mutation in one Taiwanese family with Andersen-Tawil syndrome Sindromul Andersen-Tawil , numit și sindromul Andersen și sindromul QT lung 7 , este o afecțiune genetică rară care afectează mai multe părți ale corpului. Cele trei trăsături predominante ale sindromului Andersen-Tawil includ tulburări ale funcției electrice a inimii, caracterizate printr-o anomalie observată pe o electrocardiogramă (un interval QT lung ) și o tendință la.

PRFEVERPAN, MEFV, MVK, LPIN2, TNFRSF1A, NLRP3, CIAS1, ELANE, ELA2, PSTPIP1, pyrin, mevalonate kinase, lipin-2, tumor necrosis factor receptor 1, cryopyrin, neutrophil elastase, proline-serine-threonine phosphatase-interacting protein 1, CD2-binding protein 1, Familial Mediterranean Fever, FMF, Hyperimmunoglobulinemia D syndrome, HIDS, Majeed. Andersen-Tawil syndrome (ATS) is a rare channelopathy, sometimes referred to as long QT syndrome type 7. ATS is an autosomal dominant disease predominantly caused by mutations in the KCNJ2 gene. Patients with ATS present with episodes of muscle weakness, arrythmias, including prolonged QT intervals, and various skeletal abnormalities. Unlike other channelopathies, ATS has a relatively mild. Andersen-Tawilov sindrom, poznat i kao Andersenov sindrom i sindrom dugog QT 7, je rijedak genetički poremećaj koji pogađa nekoliko dijelova tijela. Tri dominantne karakteristike uključuju poremećaje električne funkcije srca koje karakteriše abnormalnost uočena na elektrokardiogramu (dugačak QT interval) i tendencija ka abnormalni srčani ritmovi, fizičke karakteristike. Andersen-Tawil syndrome. Andersen-Tawil syndrome is caused by mutations in KCNJ2, the gene encoding the alpha subunit of Kir2.1, a member of the inwardly rectifying K+ channel family (65). Andersen-Tawil syndrome is the first human disease recognized as being caused by mutations in Kir channels

Andersen-Tawil Syndrome - NORD (National Organization for

Michael M. Segal MD PhD1Karin Jurkat-Rott MD PhD2Jacob Levitt MD3Frank Lehmann-Horn MD PhD2 1 SimulConsult Inc., USA2 University of Ulm, Germany3 Mt. Sinai Medical Center, New York, USA 5 June 2009; minor updates on 3 December 2012, 25 June 2014 This article focuses on questions that arise about diagnosis and treatment for people with hypokalemic periodic paralysis Primary periodic paralysis is a group of rare genetic disorders characterized by episodes of flaccid weakness or paralysis of skeletal muscles (Finsterer 2008). There are at least three types of primary periodic paralysis: Hyperkalemic Periodic Paralysis (HyperPP), Hypokalemic Periodic Paralysis (HypoPP) and Andersen-Tawil Syndrome (ATS)

Andersen-Tawil syndrome - Rare Cardiology New

  1. The Jervell and Lange-Nielsen syndrome. Kaan Sezer. Funded by the NIH · Developed at GeneTests (www.genetests.org), University of Washington, Seattle Jervell and Lange-Nielsen Syndrome GeneReviews [Cardioauditory Syndrome of Jervell and Lange-Nielsen, JLNS, Surdo Cardiac Syndrome] Shane M Daley, MD Genetic Counseling at Mayo Clinic in.
  2. Hội chứng Andersen-Tawil còn được gọi là Hội chứng Andersen, hội chứng QT dài 7 là một bệnh di truyền rất hiếm ảnh hưởng đến một số bộ phận của cơ thể. Ba đặc điểm nổi bật của hội chứng Andersen-Tawil bao gồm rối loạn chức năng điện của tim được đặc trưng bởi sự bất thường nhìn thấy trên.
  3. Long QT syndrome (LQTS) is a condition in which repolarization of the heart after a heartbeat is affected. It results in an increased risk of an irregular heartbeat which can result in fainting, drowning, seizures, or sudden death. These episodes can be triggered by exercise or stress. Some rare forms of LQTS are associated with other symptoms and signs including deafness and periods of muscle.
  4. Syndromic forms of LQTS associated with additional noncardiac features include Andersen-Tawil syndrome, Timothy syndrome, and Jervell and Lange-Nielsen syndrome (JLNS). Molecular confirmation of LQTS in symptomatic individuals or at-risk family members is useful to initiate treatment to prevent syncope or sudden death
  5. Resuscitated sudden cardiac death in Andersen-Tawil syndrome Airey KJ, Etheridge SP, Tawil R, Tristani-Firouzi M, Heart Rhythm, 12/1/2009 DNaseI hypersensitivity at gene-poor, FSH dystrophy-linked 4q35
  6. Andersen-Tawil syndrome affects the heart, symptoms are a disruption in the rhythm of the heart's lower chambers (ventricular arrhythmia) in addition to the symptoms of long QT syndrome. There are also physical abnormalities associated with Andersen-Tawil syndrome, these typically affect the head, face, and limbs

Andersen-Tawil syndrome: Clinical presentation and

What is Primary Periodic Paralysis (PPP)? PPP is a rare condition that affects your muscles and causes episodes of muscle weakness and/or temporary paralysis. 1,2. Episodes of weakness or paralysis usually start happening in childhood, before age 20. Some people begin having attacks as early as age 2 or even younger. 3 Drug-induced Brugada syndrome has a good prognosis if asymptomatic; however, sudden cardiac death is possible (28). A review of patients with cardiovascular syncope revealed that drug-induced syncope was an independent risk factor for rehospitalization, and careful follow-up of these patients for at least 1 year is recommended ( 23 ) Andersen-Tawil syndrome: clinical and molecular aspects (2013) International journal of cardiology, 170 (1), 1 - 16. Elsevier Ireland Ltd. ISSN 0167-5273. Andersen-Tawil syndrome (ATS) is a rare hereditary multisystem disorder. Ventricular arrhythmias, periodic paralysis and dysmorphic features constitute the classic triad of ATS symptoms Andersen-Tawil syndrome is caused by pathogenic variants in KCNJ2 potassium channels and is characterized by episodic periodic paralysis with prolonged interictal muscle weakness and cardiac anomalies (ventricular arrhythmias and prolonged QT interval). Weber, F.; Lehmann-Horn, F. Hypokalemic periodic paralysis. In GeneReviews.

Video: Andersen-Tawil syndrome - Wikipedi

GeneReviews ® [Internet

  1. Andersen- Tawil Syndrome. GeneReviews. Middle Atlantic RegionGreater Midwest Region OMIM- Gene KCNJ2. Middle Atlantic RegionGreater Midwest Region Genetics Home Reference- KCNJ2. Middle Atlantic RegionGreater Midwest Region Familial atrial fibrillation in genetics home reference
  2. The mother had electrocardiographic U-wave changes consistent with Andersen-Tawil syndrome and exaggerated by exercise but, like her daughter, none of the characteristic noncardiac features. Fluorescence in situ hybridization confirmed the deletion in the decedent and established its presence in the mother
  3. Andersen Tawil Syndrome. Donate now . Viewing 9 posts - 1 through 9 (of 9 total) November 28, 2013 at 2:24 pm #75125. Andersen Tawil Syndrome . Hi! All, I have been diagnosed with ATS for a couple of years now, but a couple of weeks ago my youngest daughter was also diagnosed, it was a big shock! Only a couple of months ago whilst taking my.
  4. Excluding patients from this analysis who carried either a homozygous variant, compound-heterozygous variants, a second (likely) pathogenic variant in another LQTS causing gene or patients who were affected by syndromic forms of LQTS (i.e., Andersen-Tawil syndrome, Jervell and Lange-Nielsen syndrome) had no effect on significant differences
  5. Andersen-Tawil Syndrome Future Forecast Assessed On The Basis Of How The Market Is Predicted To Grow 2030. Posted on 2021-07-22 by XploreMR in Healthcare // 0 Comment

Andersen-Tawil Syndrom

Delannoy E, Sacher F, Maury P, et al. Cardiac characteristics and long-term outcome in Andersen-Tawil syndrome patients related to KCNJ2 mutation. Europace. 2013;15(12):1805-1811 Bidirectional ventricular tachycardia (BDVT) is a rare form of ventricular arrhythmia, characterized by changing QRS axis of 180 degrees. Digitalis toxicity is considered as commonest cause of BDVT; other causes include aconite toxicity, myocarditis, myocardial infarction, metastatic cardiac tumour and cardiac channelopathies Andersen-Tawil syndrome: Prospective cohort analysis and expansion of the phenotype. American Journal of Medical Genetics Part along with syndactyly and similar craniofacial defects to Andersen-Tawil syndrome including cleft or high-arched palate, Mutations in Kir2.1 Cause the Developmental and Episodic Electrical Phenotypes of Andersen's Syndrome

Variable penetrance of Andersen-Tawil syndrome in a family

Zhang L, Benson DW, Tristani-Firouzi M, et al. Electrocardiographic features in Andersen-Tawil syndrome patients with KCNJ2 mutations: characteristic T-U-wave patterns predict the KCNJ2 genotype. Circulation. 2005;111(21):2720-6. PubMed Google Schola Long QT syndrome (LQTS) is an inherited primary arrhythmia syndrome that may present with malignant arrhythmia and, rarely, risk of sudden death. The clinical symptoms include palpitations, syncope, and anoxic seizures secondary to ventricular arrhythmia, classically torsade de pointes. This predisposition to malignant arrhythmia is from a cardiac ion channelopathy that results in delayed. Short-term response to phenytoin sodium in Andersen-Tawil syndrome-1 with a cardiac-dominant phenotype. Pacing Clin Electrophysiol. 2019 PMID: 30516834 Hebbar M, Shukla A, Nampoothiri S, Bielas S, Girisha KM. GeneReviews ®. 1993 PMID: 27413800. INTRODUCTION. Mutations in the KCNJ2 gene, encoding the inwardly rectifying K + channel Kir2.1, are responsible for the rare Andersen-Tawil syndrome (OMIM 170390), a condition characterized by periodic paralysis, cardiac arrhythmia and skeletal abnormalities ().Affected patients also display a distinct neurocognitive phenotype characterized by deficits in executive function and abstract.

Andersen-Tawil syndrome (long QT syndrome type 7) is characterized by a triad of features: periodic paralysis long QT syndrome 21 ) and GeneReviews [currents.plos.org] Pathophysiology Treatment Approach The treatment scheme is similar for both of these congenital arrhythmias, despite their different pathophysiology and. features in Andersen-Tawil syndrome patients with KCNJ2 mutations: characteristic T-U-wave patterns predict the KCNJ2 genotype. Circulation. 2005; 111: 2720-2726. 9. Yoon G, Quitania L, Kramer JH, Fu YH, Miller BL, Ptаcek LJ. Andersen-Tawil syndrome: definition of a neurocognitive phenotype. Neurology. 2006; 66: 1703-1710. 10 Andersen - Tawil-szindróma - Andersen-Tawil syndrome. A Wikipédiából, A Szabad Enciklopédia. Share. Pin. Tweet. Send. Share. Send. Andersen - Tawil-szindróma; Más nevek: Cardiodysrhythmic kálium-érzékeny periodikus bénulás, 7. típusú hosszú QT szindróma: Ez az állapot befolyásolja a.

Inoue YY , Aiba T , Kawata H , Sakaguchi T , Mitsuma W , Morita H , et al. Different responses to exercise between Andersen-Tawil syndrome and catecholaminergic polymorphic ventricular tachycardia. EP Europace. 2017;20. 10.1093/europace/eux351 [29] Sand O , Vigleik Sjaastad Ø , Haug E . Human physiology. The endocrine system. 2014. 2. edition Andersen-Tawil syndrome (GeneReviews article here) Thyrotoxic periodic paralysis; Autoimmune reactions to potassium channels; Diseases of oxidative metabolism such as mitochondrial diseases; Porphyria; Narcolepsy-cataplexy if there are hallucinations, sudden episodes of sleepiness, or trigger by laughing The caveolinopathies are disorders of skeletal and cardiac muscle that include limb-girdle muscular dystrophy type 1C (LGMD1C; OMIM 607801), rippling muscle disease (RMD; OMIM 606072), hypertrophic cardiomyopathy (OMIM 192600), and long-QT syndrome 9 (LQT9; OMIM 611818). Remarkable variability in expression is known and any of the phenotypes may occur in different members of the same family. Genetic testing for up to 17 genes that cause longQT syndrome (LQTS), an arrhythmia that can cause fainting, seizure-like episodes, or cardiac arrest Tranebjaerg L, Samson RA, Green GE: Jervell and Lange-Nielsen Syndrome. In GeneReviews. Edited by RA Pagon, MP Adam, HH Ardinger, et al: University of Washington, Seattle. 1993-2018. Venance SL: Andersen-Tawil Syndrome. In GeneReviews. Edited by RA Pagon, MP Adam, HH Ardinger, et al: University of Washington, Seattle. 1993-2018. 2004 Nov 22.