Which procedure was performed for the patient diagnosed with a left coronary sinus aneurysm?

The procedure performed for a patient diagnosed with a left coronary sinus aneurysm is the repair of the sinus of Valsalva aneurysm. This condition involves an abnormal dilatation or bulge in the sinus of Valsalva, which can lead to complications such as arrhythmias, heart failure, or even rupture if not addressed.

Repairing the aneurysm typically involves surgical intervention to either patch or resect the dilated segment to restore normal anatomy and function. This can help prevent further complications that arise from the aneurysm, such as compression of nearby structures or disruption of normal blood flow.

The other options are not appropriate to treat a left coronary sinus aneurysm. For instance, a left thoracotomy is a surgical approach that may be used for various thoracic procedures but is not specific to aneurysm repair. Insertion of an epicardial pacemaker lead pertains to pacing issues rather than directly addressing an aneurysm. Finally, removal of varicose veins is entirely unrelated to the diagnosis of a coronary sinus aneurysm and focuses instead on venous issues in the limbs. Thus, the repair of the sinus of Valsalva aneurysm is the correct procedure in this context.