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.
Heart tests can be very helpful in finding out what kind of heart problem you have and what treatment you need. These tests help doctors find out what's causing new symptoms, such as discomfort in your chest, shortness of breath, or irregular heartbeats. They can also: Check your heart's electrical system.