QT
Results:
T Wave Alternans
Key Points: T wave alternans is beat-to-beat alternation in T wave amplitude, polarity, or morphology with otherwise stable P waves and QRS complexes. Visible T wave alternans is a warning…
QT Interval: Basics
Key Points: Definition: The QT interval is measured from the onset of the QRS complex to the end of the T wave. It represents the total duration of ventricular depolarization…
Prolonged QT Interval: DDx
Key Points: What the QT Represents: The QT interval extends from the onset of the QRS to the end of the T wave and represents the total duration of ventricular…
Acquired Long QT Syndrome
Key Points: What It Is: Acquired Long QT Syndrome is delayed ventricular repolarization caused by an external or clinical factor, most commonly QT-prolonging medications, electrolyte abnormalities, or bradycardia. Why It…
Congenital Long QT Syndrome
Key Points: What It Is: Congenital Long QT Syndrome (LQTS) is an inherited cardiac channelopathy that delays ventricular repolarization and predisposes patients to torsades de pointes (TdP), ventricular fibrillation, syncope,…
Short QT Interval: DDx
Key Points: Short QT Interval: A QT interval is considered short when the corrected QT (QTc) interval is less than 350 ms. A short QT interval on the ECG can…
Short QT Syndrome
Key Points: Short QT Syndrome (SQTS) is a rare condition characterized by a shortened QT interval on the ECG, increasing the risk of atrial and ventricular arrhythmias, including sudden cardiac…
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