Cardiology Case Report: Syncope and Bradycardia

Our latest case report from Dr. Brady Pregerson features a man in his late 50s presenting to the ED for syncope. Check out the EKG and see if you can determine the correct diagnosis.

History: A man in his late 50’s presents to the emergency department for syncope. He has had both generalized weakness and loss of appetite that has been gradually worsening for a few weeks. He denies any injury or any palpitations, chest pain, SOB, fever, cough, or other complaints.

Exam: Vital signs are normal except for a pulse in the low to mid 40’s.

An EKG is performed:

What is the most likely cause of the EKG findings?