QT Prolongation and Torsades De Pointes

A QTc report is a warning signal, not a diagnosis of torsades de pointes. The clinical risk rises when delayed repolarization meets a trigger such as a QT-active medication, bradycardia, low potassium or magnesium, impaired drug clearance, or another QT-prolonging agent. The pattern matters: a stable borderline value calls for verification and risk reduction, whereas a marked or changing QTc, new ventricular ectopy, pauses, or a twisting polymorphic rhythm demands rapid escalation. The working sequence is to verify the measurement, identify reversible contributors, review every medication and interaction, and match ECG surveillance to risk. That sequence links the electrical abnormality to the diagnostic, treatment, and prescribing decisions below.