Complex sentence: A surgical treatment for AI is aortic valve replacement, this is currently an open-heart procedure, in the case of severe "acute" aortic insufficiency, all individuals should undergo surgery, if there are no absolute contraindications (for surgery).
Split into simpler sentences: A surgical treatment for AI is aortic valve replacement; this is currently an open-heart procedure. In the case of severe "acute" aortic insufficiency, all individuals should undergo surgery, if there are no absolute contraindications (for surgery).