The connection is:

(1) Mercury "uses" vitamin C which is used in artery-wall construction and maintenance. Long-term low vitamin C leads to deteorating veins and arteries. Take additional C with Bioflavonoids for protection.

(2) Mercury blocks an enzyme which facilitates the methylation of B12 which results in increased homocysteine levels which are well known to be associated with all sorts of cardiovascular diseases, including aneurysms. You can take extra B-12 however, there are other issues with is as it related to mercury.

Hope this helps.