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And they used the technique to demo a mock surgery inside a heart removed from a goat (left atrial appendage closure - basically seals off a portion susceptible to blood clots).

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Atrial appendage occlusions are already performed without surgery via endovascular access from the groin.

Not sure what counts as surgery for everyone here, but having my femoral artery punctured counts if a <X>ologist does it to me.

that is definitely a surgical procedure done by a surgeon.. hrm

No, it's a procedure performed by an interventional cardiologist - who is not a surgeon.

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