exercise-induced QT prolongation
Abnormal lengthening of the QT interval during or after exercise, indicating potential risk for life-threatening arrhythmias in athletes.
Full Definition
Exercise-induced QT prolongation refers to the pathological extension of the QT interval on the electrocardiogram that occurs during exercise stress testing or competitive athletic activity. Unlike the normal shortening of QT interval that occurs with increased heart rate, this condition represents abnormal repolarization that may predispose athletes to dangerous arrhythmias including torsades de pointes. The condition may indicate underlying ion channel dysfunction, drug effects, or electrolyte abnormalities that become apparent only during the physiological stress of exercise. Sports cardiologists must carefully evaluate QT interval behavior during exercise testing, as exercise-induced QT prolongation may occur even in athletes with normal resting QT intervals. This finding typically requires activity restriction and comprehensive evaluation for underlying channelopathies.
Usage
Usage note: Hyphenate when used as a compound modifier; always specify 'exercise-induced' to distinguish from other causes of QT prolongation.
In Context
- "Exercise stress testing revealed exercise-induced QT prolongation that was not apparent on the resting ECG." — Cardiology consultation report
- "The athlete was restricted from competition following documentation of exercise-induced QT prolongation during training monitoring." — Sports medicine restriction notice