A 50-year-old man comes to the emergency department due to intermittent palpitations over the last 6 months. The patient describes them as "very uncomfortable" and says the episodes occur randomly, last for several hours, and resolve spontaneously or with sleep. The current episode started an hour ago and has been accompanied by lightheadedness. He has no medical history and says that he does not like seeing doctors. He is a lifetime nonsmoker. The patient drinks beer on weekends. He has no family history of cardiovascular disease. Temperature is normal and blood pressure is 122/75 mm Hg. BMI is 30 kg/m². Chest examination reveals no murmurs and the lungs are clear on auscultation. There is trace peripheral edema. Cardiac rhythm strip obtained in the emergency department is shown in the exhibit.

Aberrant electrical activity in which of the following anatomic structures is the most likely trigger for this patient's current condition?

Question

A 50-year-old man comes to the emergency department due to intermittent palpitations over the last 6 months. The patient describes them as "very uncomfortable" and says the episodes occur randomly, last for several hours, and resolve spontaneously or with sleep. The current episode started an hour ago and has been accompanied by lightheadedness. He has no medical history and says that he does not like seeing doctors. He is a lifetime nonsmoker. The patient drinks beer on weekends. He has no family history of cardiovascular disease. Temperature is normal and blood pressure is 122/75 mm Hg. BMI is 30 kg/m². Chest examination reveals no murmurs and the lungs are clear on auscultation. There is trace peripheral edema. Cardiac rhythm strip obtained in the emergency department is shown in the exhibit.

Aberrant electrical activity in which of the following anatomic structures is the most likely trigger for this patient's current condition?

Quizplus · Accepted Answer

The Answer is C

A 50-Year-Old Man Comes to the Emergency Department Due to Intermittent