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Roentgen

An international unit of X-ray or gamma-ray radiation.

Rx

A medical prescription. The symbol “Rx” is usually said to stand for the Latin word “recipe” meaning “to take.” It is customarily part of the superscription (heading) of a prescription.

RX

Medical abbreviation for treatment.

RWI

Recreational water illness.

RVF

1. Rift Valley fever, the disease and the virus that causes it. 2. Right ventricular failure, failure of the right ventricle of the heart. 3. Residual volume fraction, a measure proportional to the ambulatory venous pressure.

RV (rotavirus)

RV is an abbreviation for rotavirus, a leading cause of severe winter diarrhea in young children. There are currently two rotavirus vaccines available in the U.S. Rotavirus was discovered in 1973 and took its name from its wheel- like appearance (rota means wheel in Latin).

RUQ

Right upper quadrant, the upper-right quarter of the abdomen.

Ruptured spleen

Rupture of the capsule of the spleen that is a potential catastrophe and requires immediate medical and surgical attention. Splenic rupture permits large amounts of blood to leak into the abdominal cavity, and it is severely painful and life threatening. Shock, and ultimately death, can result. Patients typically require immediate surgery. Rupture of a normal […]

Rupture, uterine

A tear in the uterus. A uterine rupture is a very serious situation. Causes include trauma, labor with an unusually big baby, multiple gestation, and vaginal delivery after a prior C-section (in which the old C-section scar ruptures). Uterine rupture can lead to hysterectomy, urologic injury, the need for blood transfusion, and even the death […]

Rupture of appendix

A break or tear in the appendix, usually due to appendicitis. Also called perforation of the appendix. Rupture of appendix can lead to a periappendiceal abscess (a collection of infected pus) or diffuse peritonitis (infection of the entire lining of the abdomen and the pelvis). Also called perforation of the appendix.