Well, if they meant the left vetricle of the
brain (and not the heart), then he had a
bleed in his
brain, where one of the blood vessels will burst, and it will cause his symptoms. The angiogram is a type of X-ray where they can see how well the blood is circulating in various parts of the body. See, a bleed like his comes from an aneurysm, whch is where a vessel will clog up and swell, until it reaches its breaking point.