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The recorded tracing is called an electrocardiogram (ECG, or EKG). A "typical" ECG tracing is shown to the right. The different waves that comprise the ECG represent the sequence of depolarization and repolarization of the atria and ventricles. ... If the QRS complex is prolonged (> 0.1 sec), conduction is impaired within...
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www.cvphysiology.com/Arrhythmias/A009.htm
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The QT interval is the period that extends from the beginning of ventricular depolarization until the end of ventricular repolarization (figure). For practical purposes, the QT interval is prolonged if it clearly measures more than half the R-R interval.
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medinfo.ufl.edu/~ekg/QT%20interval.html
medinfo.ufl.edu/~ekg/QT%20interval.html
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A disorder of the heart's conduction system affecting the recharging of the heart after each heartbeat. ... A standard electrocardiogram (EKG or ECG) is the best test for diagnosing LQTS. The EKG machine records your heart's electrical activity in waveforms, which can show a prolonged Q-T interval.
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www.texasheart.org/HIC/Topics/Cond/longqts.cfm
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Torsade de pointes is widely thought to be triggered by reactivation of calcium channels, reactivation of a delayed sodium current, or a decreased outward potassium current that results in early afterdepolarization (EAD), in a condition with enhanced TDR usually associated with a prolonged QT interval.
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emedicine.medscape.com/article/157826-overview
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Differential Diagnosis for EKG/Prolonged QT interval ECG Trauma Causes Traumatic Brain Hemorrhagic Necrosis Electromagnetic Physics trauma Radiation Causes Hypothermia accidental/exposure Iatrogenic... ... External Links Related to EKG/Prolonged QT interval (ECG)
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en.diagnosispro.com/differential_diagnosis-for/ekg-prol...
en.diagnosispro.com/differential_diagnosis-for/ekg-prolonged-qt-interval-ecg/28457-154.html
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Prolonged QT interval in EKG and sudden death information including symptoms, causes, diseases, symptoms, treatments, and other medical and health issues. ... Prolonged QT interval in EKG and sudden death: Related Topics...
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www.wrongdiagnosis.com/medical/prolonged_qt_interval_in...
www.wrongdiagnosis.com/medical/prolonged_qt_interval_in_ekg_and_sudden_death.htm
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12-lead ECG library, Long QT interval ... The QT interval normally varies with heart rate - becoming shorter at faster rates. It is usually corrected using the cycle length (R-R interval) as shown opposite.
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www.ecglibrary.com/l_qt.html
www.ecglibrary.com/l_qt.html
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Objective To evaluate the effect of diabetic ketoacidosis (DKA) on the QT interval corrected for heart rate (QTc) in children. ... Conclusions Prolonged QTc occurs frequently during DKA and is correlated with ketosis. Current guidelines regarding cardiac monitoring of children during DKA should be strictly followed,
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archpedi.ama-assn.org/cgi/content/full/162/6/544
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Long QT syndrome - Wikipedia, the free encyclopedia
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The long QT syndrome ( LQTS ) is a rare congenital heart condition with delayed repolarization following depolarization (excitation) of the heart, associated with syncope (fainting) due to ventric...
en.wikipedia.org/wiki/Long_QT_syndrome
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