Over the long run, however, the policies of the one-drop rule and segregation, in conjunction with other factors such as a long tradition of racial nationalism and white liberal support, generated a counter-reaction that led to a very different form of racial politics.
Learn about these ultrasound-like tests of the heart -- and find out what to expect -- here. Cardiac Catheterization. Cardiac catheterization -- also called a coronary angiogram -- means running a catheter into your heart. It's done to help doctors see what's going on in there, and whether they need to operate. Here's where to learn about it.
Blood tests play an important role in confirming â or ruling out â heart conditions such as coronary artery disease and heart failure. 1  Blood tests can measure these and other biomarkers: 2  B-type natriuretic peptides (BNP) produced by the heart to help the body eliminate fluids from the body. High levels of BNP can signal damage to the heart muscle and heart failure. Blood urea nitrogen (BUN) tests for elevated levels of urea nitrogen, a sign of kidney failure. BUN is often tested when heart failure is suspected. C-reactive protein produced by the liver in response to injury (inflammatory disease).