Nicorandil abolished repolarisation alternans in a patient with idiopathic long QT syndrome.
نویسندگان
چکیده
A 23 year old woman with idiopathic long QT syndrome had repeated syncopal attacks associated with torsades de pointes. T wave alternans (TWA) was recorded and the QT interval was abnormally prolonged during treadmill exercise test. Monophasic action potential (MAP) alternans also appeared after an abrupt shortening of the cycle length in electrophysiological study. After intravenous administration of nicorandil 6 mg, both TWA and MAP alternans disappeared.
منابع مشابه
Nicorandil suppresses a hump on the monophasic action potential and torsade de pointes in a patient with idiopathic long QT syndrome.
The patient was a 71-year-old female with Torsade de Pointes (TdP) associated with idiopathic long QT syndrome. TdP and polymorphic nonsustained VT were frequently observed at bedside and an electrophysiologic study was performed. The QT (and QTU) interval was abnormally prolonged, and alteration of the QT interval was also recorded on the electrocardiogram. Monophasic action potential (MAP) fr...
متن کاملگزارش یک مورد سندرم ژرول- لانژنلسون
Long QT syndrome, which is defined by corrected QT interval longer than 0.45 seconds in men and o. 47 sec in women , could be divided into idiopathic (congenital ) and acquired forms. The idiopathic form is a familial disorder that can be associated with sensorineural deafness (Jervell and Lange- Neelson syndrome), which is transmitted with an autosomal recessive pattern. Although this syndrome...
متن کاملImprovement of repolarization abnormalities by a K+ channel opener in the LQT1 form of congenital long-QT syndrome.
BACKGROUND This study used monophasic action potential (MAP) to examine the effect of nicorandil, a K+ channel opener, on repolarization abnormalities induced by epinephrine in the LQT1 form of congenital long-QT syndrome in which the KvLQT1 mutation underlies the defect in the channel responsible for the slowly activating component of the delayed rectifier potassium current. METHODS AND RESU...
متن کاملElectrophysiological basis of arrhythmogenicity of QT/T alternans in the long-QT syndrome: tridimensional analysis of the kinetics of cardiac repolarization.
Tachycardia-dependent QT/T alternans occurs in patients with the congenital or idiopathic form of long-QT syndrome (LQTS) and may presage the onset of polymorphic ventricular tachyarrhythmias. To examine the electrophysiological basis of arrhythmogenicity of QT/T alternans in LQTS, the tridimensional repolarization pattern of QT/T alternans was studied in the anthopleurin-A model of LQTS, a sur...
متن کاملPresence of Macrovolt T Wave Alternans and Short Coupled PVC Simultaneously in a Patient with Long QT Syndrome
This report presents a patient with macrovolt T wave alternans, PVC with R on T or a long-short sequence followed by torsades de pointes.
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید
ثبت ناماگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید
ورودعنوان ژورنال:
- Heart
دوره 82 5 شماره
صفحات -
تاریخ انتشار 1999