Arq. Bras. Cardiol. 2020; 115(1 suppl 1): 10-13
Idiopathic Left-Bundle Branch Block and Unexplained Symptom At Exercise: A Case Report
Guilherme Veiga Guimarães
, Edimar Alcides Bocchi
Introduction
The presence of a left bundle branch block (LBBB) in the apparent absence of any other heart disease raises questions and concerns about the stratification of the risk of subsequent cardiovascular events or symptoms. – The detection of LBBB in asymptomatic adults, including athletes, is estimated to range between 0.1% and 0.8%, which is more likely to represent a structural heart disease rather than a physiological response to exercise. – On the other hand, some studies have shown that the mortality risk of patients with LBBB and heart disease varies between 2.4% and 11% per year.
Although several studies have suggested that exercise-induced LBBB is usually associated with cardiovascular disease and, particularly, coronary artery disease, there are contrasting studies showing an association between exercise-induced LBBB and normal coronary arteries. , , However, exercise-related cardiovascular adverse effects in LBBB with normal resting cardiac function remains poorly defined.
[…]
2,496
