A 45-year-old woman complains of near syncope. Her heart rate is 50 bpm. On ECG, third-degree heart block is noted.

She had been in good health, but she spent time camping and had numerous tick bites six months previously. *This case is from the Editorial Team of Docplexus and is meant for educational purposes only. Source: Case Files – Internal Medicine Stay connected, the answer will be posted soon!