Thin the blood and prevent clots (if you have a man-made replacement valve). Doctors also prescribe these medicines for mitral stenosis or other valve defects that raise the risk of blood clots. Treat coronary heart disease. Medicines for coronary heart disease can reduce your heartâs workload and relieve symptoms.
undefined is a property of the global object, i.e. it is a variable in global scope. The initial value of undefined is the primitive value undefined. In modern browsers (JavaScript 1.8.5 / Firefox 4+), undefined is a non-configurable, non-writable property per the ECMAScript 5 specification. Even when this is not the case, avoid overriding it.
Key Points. 1  Defined media is made from constituents that are completely understood. 2  Undefined media has some part of which is not entirely defined. 3  The presence of extracts from animals or other microbes makes a media undefined as the entire chemical composition of extracts are not completely known.