| Your
answer (C) is not the one that we are looking for. (B) is correct!
- The isotope stress test revealed a reversible
inferior and posterolateral deficit. This finding is consistent with
viable muscle being supplied either via antegrade flow from a grafted
vessel or via collaterals.
- The prior angiograms revealed total occlusion
of the proximal RCA and Cx with collateral flow to the RCA (via the
LIMA to the LAD). There were no collaterals to the Cx. This would suggest
that the Cx must have beeen supplied by the only remaining vessel (SVG
to the RCA). Thus, this vessel would be expected to have some patency.
A significant associated lesion would also be anticipated to account
for the ischemia in the distribution of the RCA (inferior wall) and
Cx (posterolateral wall).
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