نتایج جستجو برای: romano ward syndrome
تعداد نتایج: 645734 فیلتر نتایج به سال:
The voltage-gated K+ channel KVLQT1 is essential for the repolarization phase of the cardiac action potential and for K+ homeostasis in the inner ear. Mutations in the human KCNQ1 gene encoding the alpha subunit of the KVLQT1 channel cause the long-QT syndrome (LQTS). The autosomal dominant form of this cardiac disease, the Romano-Ward syndrome, is characterized by a prolongation of the QT inte...
BACKGROUND Although the incidence of ventricular tachyarrhythmias associated with structural heart disease is highest in winter and during the daytime, seasonal and circadian variations among cardiac events in patients with congenital long QT syndrome (LQTS) remain unknown. The present study aims to determine seasonal and circadian cardiac events in patients with a congenital LQTS genotype. M...
The inherited long QT syndrome (LQTS), characterized by a prolonged QT interval in the electrocardiogram and cardiac arrhythmia, is caused by mutations in at least four different genes, three of which have been identified and encode cardiac ion channels. The most common form of LQTS is due to mutations in the potassium channel gene KVLQT1, but their effects on associated currents are still unkn...
The KvLQT1 gene encodes a voltage-gated potassium channel. Mutations in KvLQT1 underlie the dominantly transmitted Ward-Romano long QT syndrome, which causes cardiac arrhythmia, and the recessively transmitted Jervell and Lange-Nielsen syndrome, which causes both cardiac arrhythmia and congenital deafness. KvLQT1 is also disrupted by balanced germline chromosomal rearrangements in patients with...
Long QT syndrome (LQTS) is a cardiac arrhythmia that frequently presents in childhood and is characterized by a prolonged QT interval on electrocardiogram (ECG) in combination with syncope or cardiac arrest; these findings often occur in the setting of physical or emotional stress or abrupt auditory stimuli. The genetics of LQTS have been well documented over the past decade, with the identific...
AIMS Long QT syndrome (LQTS) is a primary electrical disease characterized by QT prolongation and increased repolarization dispersion leading to T-wave amplitude beat-to-beat changes. We aimed to quantify beat-to-beat T-wave amplitude variability from ambulatory Holter recordings in genotyped LQTS patients. METHODS AND RESULTS Seventy genotyped LQTS patients (mean age 23 +/- 15 years, 42 male...
BACKGROUND Previous studies of long QT syndrome (LQTS) have revealed the presence of country-specific hot spots in KCNQ1 mutations, and the purpose of this study was to evaluate the influence of a common mutation on clinical phenotypes in Japanese LQT1 patients. METHODSANDRESULTS We retrospectively studied the frequency of each mutation in 190 LQT1 Japanese probands and evaluated the clinical...
The discovery of genetic defects underlying long-QT syndrome (LQTS) has allowed to identify important genotype-phenotype correlations that are now being used for risk stratification. The next challenge is to exploit the new information on the pathophysiology of the disease derived from molecular genetics to devise more effective therapies. The successful response of LQT1 patients to -blockers, ...
Congenital long QT syndrome (LQTS) is caused by mutations in various cardiac potassium or sodium channel genes, with 6 different genotypes thus far identified. However, it is unknown whether these genotypes can be differentiated by QT variables. The electrocardiograms obtained from 16 patients with a mutation in KCNQ1 (LQT1), 7 patients with a mutation in HERG (LQT2) and 20 control subjects wer...
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