RT Journal Article SR Electronic T1 Rate-Dependent Left Bundle-Branch Block in a Child With Propionic Aciduria JF Ochsner Journal JO Ochsner J FD O. P. Jindal Global University SP 65 OP 67 VO 9 IS 2 A1 Ardoin, Kipp B. A1 Moodie, Douglas S. A1 Snyder, Christopher S. YR 2009 UL http://www.ochsnerjournal.org/content/9/2/65.abstract AB In most cases, a left bundle-branch block pattern on an electrocardiogram is a postoperative phenomenon. Under rare circumstances, it can be found in patients after myocardial infarction or in patients with hypertrophic cardiomyopathy, or it can be exercised induced. We describe a pediatric patient with propionic aciduria, dilated cardiomyopathy, and rate-dependent left bundle-branch block on her electrocardiogram.