| RAD | radial artery catheter; radiation absorbed dose; radical; radiography or radiographic; reactive airw... |
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| RFA | resident functional atlas; right femoral artery; right frontoanterior [fetal position] |
| RSA | rabbit serum albumin; regular spiking activity; relative specific activity; relative standard accura... |
| RVA | re-entrant ventricular arrhythmia; right ventricle activation; right vertebral artery |
| RL | radial line; radiation laboratory; reduction level; renal dysplasia-limb defects [syndrome]; resisti... |
| right main bronchus | It arises at the bifurcation of the trachea and enters the hilum of the right lung, giving off the superior lobe bronchus and continuing downward to give off the middle and inferior lobe bronchi. It is shorter, of greater caliber, and more nearly-vertical than the left main bronchus, thus, aspirated objects more frequently lodge on the right side. Synonym: bronchus principalis dexter. (05 Mar 2000) |
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| right margin of heart | The border between the sternocostal and diaphragmatic surfaces of the heart; it is fairly well defined in fixed hearts but is rounded and indefinite in the living heart. Synonym: margo dexter cordis, right margin of heart. (05 Mar 2000) |
| right middle lobe syndrome | <radiology> Controversial, associated with asthma, cough, wheezing, recurrent pneumonia, XR findings: total or partial RML atelectasis, with or without bronchial narrowing (12 Dec 1998) |
| right or left lateral decubitus film | A radiograph exposed with the subject in the decubitus position; named for the side that is dependent. Synonym: right or left lateral decubitus film. (05 Mar 2000) |
| right ovarian vein | <anatomy, vein> Begins as the pampiniform plexus at the hilum of the ovary and opens into the inferior vena cava. Synonym: vena ovarica dextra. (05 Mar 2000) |
| right ovarian vein syndrome | <syndrome> A condition characterised by intermittent abdominal pain due to ureteral compression by the right ovarian vein, occurring with most frequency on the right side, and thought to be due to aberrant crossing of the right ovarian vein over the ureter, generally at the level of the first sacral vertebra; dilation of the ovarian vein during pregnancy and unilateral ptosis of the kidney are thought to be contributing factors leading to intermittent ureteral obstruction and recurring bouts of pain and pyelonephritis. (05 Mar 2000) |
| right parasternal impulses | Cardiac activity as palpable or recordable just to the right of the sternum. (05 Mar 2000) |
| right part of diaphragmatic surface of liver | The part of the diaphragmatic surface of the liver deep to the bodies of the lower ribs on the right side. Synonym: pars dextra faciei diaphragmaticae hepatis. (05 Mar 2000) |
| right sagittal fissure | A sagittal groove on the undersurface of the liver formed by the fossa vesicae felleae anteriorly and the sulcus venae cavae posteriorly. (05 Mar 2000) |
| right splicing junction | Boundary between the right end of an intron and the left end of the adjacent exon. Synonym: acceptor splicing site. (05 Mar 2000) |
| right superior intercostal vein | <anatomy, vein> A tributary of the azygos vein formed by the union of the right second, third, and fourth posterior intercostal veins. Synonym: vena intercostalis superior dextra. (05 Mar 2000) |
| right suprarenal vein | <anatomy, vein> The short vein that passes from the hilum of the right suprarenal to the inferior vena cava. Synonym: vena suprarenalis dextra. (05 Mar 2000) |
| right testicular vein | <anatomy, vein> Begins as the pampiniform plexus and ascends to joint the inferior vena cava. Synonym: vena testicularis dextra. (05 Mar 2000) |
| right to die | The right of the patient or the patient's representative to make decisions with regard to the patient's dying. (12 Dec 1998) |
| right-to-left shunt | The passage of blood from the right side of the heart into the left (as through a septal defect), or from the pulmonary artery into the aorta (as through a patent ductus arteriosus); such a shunt can occur only when the pressure on the right side exceeds that in the left, as in advanced pulmonic stenosis, or when the pulmonary artery pressure exceeds aortic pressure, as in one form of Eisenmenger's syndrome or in tricuspid atresia. (05 Mar 2000) |