| ARC | accelerating rate calorimetry; acquired immunodeficiency syndrome-related complex; active renin conc... |
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| ARF | acute renal failure; acute respiratory failure; acute rheumatic fever; Addiction Research Foundation... |
| ARM | adrenergic receptor material; aerosol rebreathing method; ambulatory renal monitor; anorectal manome... |
| ARN | acute renal necrosis; acute retinal necrosis; arcuate nucleus; Association of Rehabilitation Nurses |
| BOR | basal optic root; before time of operation; bowels open regularly; branchio-oto-renal [syndrome] |
| renal osteodystrophy | Generalised changes in the bone which resemble osteomalacia and rickets, occurring in those with chronic renal failure. (27 Sep 1997) |
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| renal papilla | <anatomy> The apex of a renal pyramid that projects into a minor calyx; some 10 to 25 openings of papillary ducts occur on its tip, forming the area cribrosa. Synonym: papilla renalis. (07 Mar 2000) |
| renal papillary necrosis | <nephrology> Necrosis of renal papillae, occurring in acute pyelonephritis, especially in diabetics, or in analgesic nephropathy; renal failure may result. Synonym: necrotizing papillitis. (05 Mar 2000) |
| renal pelvis | <anatomy> The area at the centre of the kidney. Urine collects here and is funneled into the ureter. (12 Dec 1998) |
| renal plasma flow | <physiology> The amount of plasma that perfuses the kidneys per unit time, approximately 10% greater than effective renal plasma flow. It should be differentiated from the renal blood flow which refers to the total volume of blood flowing through the renal vasculature, while the renal plasma flow refers to the rate of plasma flow. (12 Dec 1998) |
| renal plexus | The autonomic plexus surrounding the renal artery and extending with it into the substance of the kidney. Synonym: plexus renalis. (05 Mar 2000) |
| renal-portal | <anatomy> Both renal and portal. See Portal. Source: Websters Dictionary (01 Mar 1998) |
| renal portal system | An arterial portal system, in which efferent glomerular arterioles receive blood from the capillaries of the renal glomeruli and carry it to the peritubular capillary plexus surrounding the proximal and distal convoluted tubules. Synonym: hypothalamohypophysial portal system. (05 Mar 2000) |
| renal pyramid | One of a number of pyramidal masses seen on longitudinal section of the kidney; collectively, they constitute the renal medulla, and contain part of the secreting tubules and the collecting tubules. Synonym: pyramis renalis, malpighian pyramid, medullary pyramid. (05 Mar 2000) |
| renal reflex | Anuria caused by injury to a remote part of the body or by disease or injury to one kidney or ureter. (05 Mar 2000) |
| renal replacement therapy | Procedures which temporarily or permanently remedy insufficient cleansing of body fluids by the kidneys. (12 Dec 1998) |
| renal retinopathy | Hypertensive retinopathy associated with chronic glomerulonephritis or nephrosclerosis. (05 Mar 2000) |
| renal segments | Regions of the kidney supplied by end arteries branching from the renal arteries; they are named anterior inferior segmentum, anterius superior segmentum, inferior segmentum, posterior segmentum, and superior segmentum. Synonym: segmenta renalia, arterial segments of kidney. (05 Mar 2000) |
| renal sinus | The cavity of the kidney, containing the calyces and pelvis of the ureter and the segmental vesels embedded within a fatty matrix. The renal sinuses cause the kidneys to appear hollow or C-shaped on cross section or medical imaging. Synonym: sinus renalis. (05 Mar 2000) |
| renal-splanchnic steal | Diversion of blood from the right renal artery via the inferior adrenal branch into splanchnic collaterals distal to a stenosis of the coeliac axis. (05 Mar 2000) |