need help with TPA injection into the aortic root

Can anyone help with this cpt code? A congenital cath was performed, and after the angiograms the physician injected TPA into the aortic root. At the end of the case, an arterial line was placed with the plan for continued administration of systemic TPA. I am debating if I should use cpt code 37211 or 92975, but I am unsure if either of those are correct.

Any help would be greatly appreciated. Thank you!
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