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.
More on Electrocardiogram (ECG) / Stress Test / Holter Monitor. Electrocardiogram (ECG) / Stress Test / Holter Monitor. Considered the first diagnostic tool for heart disease, an electrocardiogram (ECG) assesses the heart's electrical activity using electrodes that are attached to the skin of the chest, arms, and legs. As recorded by the ECG, the heart's electrical activity is represented by a series of waves.