An exercise treadmill test or “stress test” examines the heart's electrical activity while the patient is exercising. Exercise-induced ventricular arrhythmias (EIVAs) are abnormal heartbeats that are triggered by exercise. Some studies show that patients with EIVA during exercise testing are at higher risk for bad outcomes, such as death, than are patients without EIVA. However, not all studies have shown this relationship between EIVA and bad outcomes. Exercise-induced ventricular arrhythmia can occur with a type of electrical abnormality called right bundle-branch block (RBBB), with left bundle-branch block (LBBB), or with both types of abnormality.