Diagnosis not to be missed: Lyme carditis, rare but reversible cause of complete atrioventricular block

Abstract Lyme carditis is a known cause of atrioventricular block and in most cases, atrioventricular block is reversible with appropriate antibiotic treatment. The diagnosis can be challenging if the disease is either not suspected, or if the initial cutaneous manifestation of erythema migrans is missed. It is important to diagnose Lyme carditis as the cause of complete heart block if unnecessary pacemaker implantation is to be avoided. We present a 43-year-old male who presented with complete heart block and also illsustained ventricular tachycardia due to Lyme carditis that reversed completely with antibiotic therapy.