A 45-year-old man comes to clinic due to frequent episodes of palpitations accompanied by dizziness, fatigue, and shortness of breath. Prolonged ECG monitoring identifies episodes of atrial fibrillation associated with a rapid ventricular response rate. A radiofrequency ablation procedure is planned. The access site is the right femoral vein. The ablation catheter is advanced to the left atrium where radiofrequency energy is used to eliminate an ectopic focus of abnormal electrical activity. During the procedure, the catheter most likely passes through which of the following structures?

Question

A 45-year-old man comes to clinic due to frequent episodes of palpitations accompanied by dizziness, fatigue, and shortness of breath.  Prolonged ECG monitoring identifies episodes of atrial fibrillation associated with a rapid ventricular response rate.  A radiofrequency ablation procedure is planned.  The access site is the right femoral vein.  The ablation catheter is advanced to the left atrium where radiofrequency energy is used to eliminate an ectopic focus of abnormal electrical activity.  During the procedure, the catheter most likely passes through which of the following structures?

Quizplus · Accepted Answer

The Answer is B

A 45-Year-Old Man Comes to Clinic Due to Frequent Episodes