Transient right bundle branch block: A rare manifestation in cardiac contusion.

Transient right bundle branch block following blunt cardiac injury is a known but under-recognized manifestation of cardiac contusion. The first case documented in the medical literature occurred in 1952 in a 22-year-old man who was thrown from a motorcycle. Due to their relatively anterior location, the right ventricle and right bundle branch are at particular risk of injury in contusion. We present here a case in which a 24-year-old man suffered a blunt chest trauma leading to a right bundle branch block and elevated troponin levels, consistent with cardiac contusion. His conduction system abnormalities rapidly resolved and he recovered completely, with no clinical sequelae. <Learning objective: Cardiac contusion is a heterogeneous syndrome with widely variable clinical manifestations and severity. Transient right bundle branch block has been described as a self-limited and benign manifestation of cardiac contusion. This case highlights the need for a better understanding of the natural history and predictors of serious complications of cardiac contusion, which can aid in determining appropriate diagnostic studies, risk stratification, and treatment.>.