You're finishing a mitral valve replacement, patient is warm and the heart is beating. Every thing looks good and you're ready to come off except that you've got profound s-t elevation in II only. Otherwise healthy patient (work with me here) and you've reasonably ruled out every other probable cause except air in the coronaries, which is what it is. Which side is it, left or right and why is it more probable to occur on that side? What is to be done about it?