The Best ECG Lead for Predicting the Risk of Drug-Induced Torsade De Pointes Using Corrected QT Interval: A...

Area of Science:

• Cardiology
• Pharmacology
• Medical Diagnostics

Background:

• Torsade de pointes (TdP) is a life-threatening arrhythmia linked to drug-induced QT prolongation.
• Electrocardiogram (ECG) leads show varying QT interval lengths, potentially impacting TdP prediction accuracy.

Purpose of the Study:

• To identify the optimal ECG lead or combination of leads for predicting drug-induced TdP.
• To compare the prognostic accuracy of different ECG leads and QTc measurement methods.

Main Methods:

• A comparative prognostic accuracy study involving TdP cases and controls.
• Calculation and comparison of Areas Under the Receiver Operating Characteristic Curve (AUROC) for various single and combined ECG leads' heart rate-corrected QT (QTc) intervals.
• QTc measurements performed by four investigators with high interrater reliability (0.95).

Main Results:

• The longest QTc interval across any lead demonstrated the highest AUROC for TdP prediction, irrespective of the QTc correction formula used.
• Lead V3 frequently exhibited the longest QTc interval among individual leads.
• A mean QTc from 3 leads (Lead II plus any two from V2-V4) and a median QTc from 6 leads showed comparable TdP prediction performance.

Conclusions:

• The longest QTc interval is a strong predictor of drug-induced TdP, but its location varies per patient.
• A mean QTc derived from 3 specific leads offers a practical alternative with similar predictive performance.
• Prospective studies are needed to validate the clinical utility of these findings.