exercise-induced left bundle branch block
Also written as: LBBB — Left Bundle Branch Block
Development of left bundle branch block pattern on ECG during or immediately after exercise testing.
Full Definition
Exercise-induced left bundle branch block (LBBB) is an electrocardiographic abnormality that appears during exercise stress testing, characterized by QRS widening and typical LBBB morphology. This finding may indicate underlying coronary artery disease, cardiomyopathy, or conduction system abnormalities that become apparent only under exercise stress. In athletes, this condition requires careful evaluation as it may represent a pathological response to exercise and could indicate increased risk for cardiac events during competition.
Usage
Usage note: Abbreviate as LBBB in clinical contexts. Distinguish from right bundle branch block and rate-dependent conduction delays.
In Context
- "The marathon runner developed exercise-induced left bundle branch block during maximal stress testing." — Cardiology consultation report
- "Exercise-induced LBBB resolved immediately upon cessation of physical activity." — Exercise stress test report