An antigen found on the surface of red blood cells. Red blood cells with the antigen are said to be Rh positive (Rh+). Those without the surface antigen are said to be Rh negative (Rh-). Blood used in transfusions much match donors for Rh status as well as for ABO blood group, as Rh- patients will develop anemia if given R+ blood. Rh typing is also important during abortion, miscarriage, pregnancy, and birth, as mother and fetus may not be Rh-compatible. Rh stands for rhesus monkeys, in whose blood this antigen was first found.
See also RhoGAM, Rh incompatibility.
- Rh incompatibility
the first twin was hydropic (swollen with edema fluid) and stillborn, and the second of the twins was deeply jaundiced and subsequently died of kernicterus.
A condition in which skeletal muscle is broken down, releasing muscle enzymes and electrolytes from inside the muscle cells. Risks of rhabdomyolysis include muscle breakdown and kidney failure because the cellular component myo- globin is toxic to the kidneys. Rhabdomyolysis is relatively uncommon, but it most often occurs as the result of extensive muscle damage […]
A fast-growing malignancy of muscle that mainly affects children (more than 60 percent of cases are diagnosed before age 10) but can occur at any age. Treatment includes surgery, radiotherapy, chemotherapy, and, most often, a combination of these modes of treatment. The outlook depends on a number of factors, including the original location of the […]
- Rheumatic fever
An illness that occurs following a streptococcus infection (such as a “strep throat”) or scarlet fever and predominantly affects children. Symptoms include fever, pain in the joints, nausea, stomach cramps, and vomiting. Rheumatic fever can cause long-lasting effects in the skin, joints, heart, and brain. Rheumatic fever may be followed by Sydenham’s chorea and by […]
- Rheumatic heart disease
Heart damage caused by rheumatic fever. Treatment involves prevention of reinfection with streptococcus and use of medications to treat any heart complications, as needed.