Lyme Carditis: A Case Involving the Conduction System and Mitral Valve.

Lyme disease is the most common tick-borne infection in the Northern hemisphere. Cardiac manifestations of Lyme disease typically include variable atrioventricular nodal block and rarely structural heart pathology. The incidence of Lyme carditis may be underestimated based on current reporting practices of confirmed cases.

Cardiac arrest with "pseudo-Brugada" ECG pattern in the setting of a coronary artery anomaly.

A 36-year-old Hispanic man with no prior cardiac history presented with chest pain and then ventricular fibrillation requiring defibrillation after a physical altercation. His ECG on presentation to the emergency room was suggestive of Brugada syndrome, which later normalized. Cardiac catheterization revealed anomalous origin of right coronary artery from the left coronary cusp (coursing between the pulmonary artery and the aorta) for which he underwent surgical reimplantation, and subsequent pharmacological challenge test did not provoke reappearance of a Brugada ECG pattern.