Symptoms. Related dementias share some common symptoms. Vascular changes that start in brain areas that play a key role in storing and retrieving information may cause memory loss that looks very much like Alzheimer's disease.
Rh is short for Rhesus factor. Rhesus factor is a type of antigen present on the surface of red blood cells. If you have have this particular antigen, you are Rh positive. If you donât, youâre Rh negative. The Rh factor is important in determining blood type for transfusions. Normally Your immune system protects against potentially harmful substances (antigens). When foreign antigens enter your body, your immune system makes antibodies to help destroy them.
1942, from the first letters of rhesus; so called because the blood group, and its effects, were discovered in the blood of rhesus monkeys (1941). Rh factor n. Any of several substances on the surface of red blood cells that induce a strong antigenic response in individuals lacking the substance.