Clinicians should recognize septal fascicular block as an emerging cause of a prominent R-wave in the right precordial leads, especially when intermittent.
BACKGROUND: A septal fascicle of the left bundle branch is an anatomical variant present in a substantial number of human hearts. However, the electrocardiographic features of its block remain controversial. CASE SUMMARY: We describe a case of transitory prominent anterior forces consistent with an intermittent left septal fascicle block, identified on a preoperative ECG of an adult male with a history of diabetes mellitus and systemic hypertension. CONCLUSION: Clinicians should recognize septal fascicular block as an emerging and underrecognized cause of a prominent R-wave in the right precordial leads, particularly when the pattern is intermittent.
Barreiro et al. (Fri,) studied this question.