نتایج جستجو برای: long qt سندرم
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In the interesting article by Viskin et al., adenosine-induced bradycardia was found to produce a higher increase in QT and a lower decrease in QTc (calculated using the Bazett formula) in subjects with long-QT syndrome (LQTS) than in controls. However, a major issue in this study concerns the reliability of QT correction when large ranges of heart rates are analysed. The Bazett formula overcor...
سندرم qt طولانی ارثی یک گروه اختلال فامیلیال است که افراد مبتلا را مستعد وقایع مهم قلبی مثل سنکوپ، تاکی کاردی بطنی پلی مورفیک و مرگ ناگهانی میکند. این سندرم که شیوعی در حدود 1 تا 2 مورد در 10000 نفرجمعیت دارد عمدتا کودکان و جوانان را مبتلا می سازد. با توجه به زمینه خانوادگی و ژنتیک بیماری و نیز فاکتورهای مستعدکننده برای ایجادآریتمی های کشنده در افراد دارای زمینه مثل مصرف برخی داروها، فاکتورهای ...
OBJECTIVES To improve the diagnostic criteria of the congenital long QT syndrome in borderline cases we examined rate adaptation of ventricular repolarization phases during exercise and subsequent recovery in children with the long QT syndrome and controls. METHODS Nineteen children with definite long QT syndrome and 19 healthy controls underwent exercise testing. QT intervals were measured t...
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It is generally assumed that long QT syndrome (LQTS) is an arrhythmic disorder that occurs in patients with normal left ventricular systolic function. The present article by Haugaa et al challenges this assumption.1 One hundred and one patients with genetically documented LQTS were systematically compared to an age-matched unaffected control population for differences in regional contraction pa...
Long QT syndrome is characterized by prolongation of the corrected QT (QTc) interval on the surface electrocardiogram and is associated with precipitation of torsade de pointes (TdP), a polymorphic ventricular tachycardia that may cause sudden death. Acquired long QT syndrome describes pathologic excessive prolongation of the QT interval, upon exposure to an environmental stressor, with reversi...
BACKGROUND Congenital long-QT syndrome is a disorder resulting in ventricular arrhythmias and sudden death. The most common forms of the long-QT syndrome, types 1 and 2, are caused by mutations in the potassium-channel genes KCNQ1 and KCNH2, respectively. Although inheritance of the long-QT syndrome is autosomal dominant, female predominance has often been observed and has been attributed to an...
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