Which papillary muscle most commonly rupture following an MI?
Contents
- [A] Anterior
- [B] Septal
- [C] Anterolateral
- [D] Posteromedial
Posteromedial papillary muscle most commonly rupture following an MI.
Why Posteromedial papillary muscle mst commonly rupture following an MI?
ANSWER
The anterolateral papillary muscle has a dual blood supply, whereas the posteromedial papillary muscle has blood supply only from the posterior descending coronary; thus in most patients, it is the posteromedial papillary muscle that will rupture following an MI.
- Antero-lateral papillary muscle blood supply is from the left anterior descending and the diagonal or a marginal branch of the circumflex artery.
- The left circumflex or right coronary artery (depending on dominance) provides the blood supply to the postero-medial papillary muscle
