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.
Your doctor or cardiologist can take a close look at your heart using an echocardiogram. An echocardiogram is a common ultrasound test that examines your heart and shows its movements. The procedure is helpful in identifying any abnormalities in your heart and heart valves. During the test, sound waves are used to produce images of your heart. An echocardiogram examines: Heart size: The chambers or the muscular walls of your heart may be enlarged due to damaged heart valves, high blood pressure, or other diseases. Heart valves: The test shows whether your valves are shaped normally, whether they open and close correctly, and whether they are leaky.