What condition is this?

This patient was undergoing cardiac surgery for Atrial septal defect cardiothoracic OT. Then the Cardiac surgeon and anesthetist called for help from the vascular surgeon. The right upper limb was found to be swollen and ischemic on examination by vascular surgeon.

A small procedure was done. What could it be?

What can happen to the limb if unattended?

By
Pinjala R K