Changes: Kidney diseases

Latest revision as of 00:14, 27 December 2009

Biological: Behavioural genetics · Evolutionary psychology · Neuroanatomy · Neurochemistry · Neuroendocrinology · Neuroscience · Psychoneuroimmunology · Physiological Psychology · Psychopharmacology (Index, Outline)

There are a large number of kidney diseases which affect kidney function. Those of interest to psychologists include:

Congenital

Polycystic kidney disease
Congenital hydronephrosis
Renal dysplasia
Congenital obstruction of urinary tract
Horseshoe kidney
Duplicated ureter

Acquired

Renal failure
- Acute renal failure
- Chronic renal failure
Kidney stones are a relatively common and particularly painful disorder.
Pyelonephritis is infection of the kidneys and is frequently caused by complication of a urinary tract infection.
Azotemia is a toxic condition characterized by abnormal and dangerously high levels of urea, creatinine, various body waste compounds, and other nitrogen-rich compounds in the blood.
Hydronephrosis is the enlargement of one or both of the kidneys caused by obstruction of the flow of urine.
In nephrotic syndrome, the glomerulus has been damaged so that a large amount of protein in the blood enters the urine. Other frequent features of the nephrotic syndrome include swelling, low serum albumin, and high cholesterol.
Kidney tumors
- Wilms tumor
- Renal cell carcinoma
Glomerulonephritis
Diabetic nephropathy
Lupus nephritis
Minimal change disease
Trauma
Interstitial nephritis

Dialysis and kidney transplants

Generally, humans can live normally with just one kidney. Only when the amount of functioning kidney tissue is greatly diminished will renal failure develop. If renal function is impaired, various forms of medications are used, while others are contraindicated. Provided that treatment is begun early, it may be possible to reverse chronic kidney failure due to diabetes or high blood pressure. If creatinine clearance (a measure of renal function) has fallen very low ("end-stage renal failure"), or if the renal dysfunction leads to severe symptoms, dialysis is commenced. Dialysis is a medical procedure, performed in various different forms, where the blood is filtered outside of the body.

Kidney transplantation is the only cure for end stage renal failure; dialysis, is a supportive treatment; a form of "buying time" to bridge the inevitable wait for a suitable organ.

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+{{bioPsy}}
+There are a large number of '''kidney diseases''' which affect [[kidney]] function.  Those of interest to psychologists include:
+<!-- These lists need editing in the light of the literature -->
+===Congenital===
-{{Main| The role of the health psychologist in kidney disease}}
-[[Image:Kidneys_from_behind.jpg|thumb|250px|Human kidneys viewed from behind with spine removed]]
-The '''kidneys''' are [[bean]]-shaped [[excretion|excretory]] [[organ (anatomy)|organ]]s in [[vertebrate]]s. Part of the [[urinary system]], the kidneys filter wastes (especially [[urea]]) from the [[blood]] and excrete them, along with [[water (molecule)|water]], as [[human urine|urine]]. The medical field that studies the kidneys and diseases affecting the kidney is called [[nephrology]],  from the [[Greek language|Greek]] name for the kidney; the [[adjective]] meaning "kidney-related" is '''''renal''''', from the [[Latin language|Latin]].
-==Location==
-In [[human]]s, the kidneys are located in the [[posterior]] part of the [[abdomen]]. There is one on each side of the [[spine (anatomy)|spine]]; the right kidney sits just below the [[liver]], the left below the [[diaphragm (anatomy)|diaphragm]] and adjacent to the spleen. Above each kidney is an [[adrenal gland]] (also called the ''suprarenal gland'').
-The kidneys are retroperitoneal, which means they lie behind the [[peritoneum]], the lining of the [[abdominal cavity]]. They are approximately at the [[vertebra]]l level T12 to L3, and the right kidney usually lies slightly lower than the left in order to accommodate the liver.
-The upper parts of the kidneys are partially protected by the eleventh and twelfth [[rib]]s, and each whole kidney is surrounded by two layers of fat (the perirenal fat and the pararenal fat) which help to cushion it.
-[[Image:Kidney_section.jpg|thumb|Above each human kidney is one of the two [[adrenal gland]]s.]]
-==Structure==
-===Organization===
-In a normal [[human]] adult, each kidney is about 11 cm long and about 5 cm thick, weighing 150 [[1 E-1 kg|grams]]. The kidneys are "bean-shaped" organs, and have a [[concave]] side facing inwards (medially). On this medial aspect of each kidney is an opening, called the [[hilum]], which admits the renal [[artery]], the renal [[vein]], [[nerve]]s, and the [[ureter]].
-The outermost portion of the kidney is called the [[renal cortex]], which sits directly beneath the kidney's [[loose connective tissue]] capsule. Deep to the cortex lies the [[renal medulla]], which is divided into 10-20 [[renal pyramid]]s in humans. Each pyramid together with the associated overlying cortex forms a renal lobe. The tip of each pyramid (called a ''papilla'') empties into a calyx, and the calyces empty into the [[renal pelvis]]. The pelvis transmits urine to the [[urinary bladder]] via the [[ureter]].
-===Blood supply===
-Each kidney receives its blood supply from a [[renal artery]], two of which branch from the abdominal [[aorta]]. Upon entering the hilum of the kidney, the renal artery divides into smaller interlobar arteries situated between the renal papillae. At the outer medulla, the interlobar arteries branch into arcuate arteries, which course along the border between the renal medulla and cortex, giving off still smaller branches, the cortical radial arteries (sometimes called ''interlobular arteries''). Branching off these cortical arteries are the afferent arterioles supplying the glomerular capillaries, which drain into efferent arterioles. Efferent arterioles divide into peritubular capillaries that provide an extensive blood supply to the cortex. Blood from these capillaries collects in renal venules and leaves the kidney via the [[renal vein]]. Efferent arterioles of glomeruli closest to the medulla (those that belong to [[juxtamedullary nephron]]s) send branches into the medulla, forming the vasa recta.
-===Nephron===
-[[Image:Kidney_PioM.png|300px|thumb|right|]]
-{{main|Nephron}}
-The basic functional unit of the kidney is the [[nephron]], of which there are more than a million in each normal adult human kidney. Nephrons regulate water and soluable matter (especially [[electrolyte]]s) in the body by first filtering the blood, then reabsorbing some necessary fluid and molecules while secreting other, unneeded molecules. Reabsorption and secretion are accomplished with both cotransport and [[countercurrent exchange|countertransport]] mechanisms established in the nephrons and associated collecting ducts.
-===Collecting duct system===
-{{main|Collecting duct system}}
-Fluid flows from the nephron into the [[collecting duct system]]. This segment of the nephron is crucial to the process of water conservation by the organism. In the presence of [[antidiuretic hormone]] (ADH; also called vasopressin), these ducts become permeable to water and facilitate its reabsorption, thus concentrating the urine and reducing its volume. Conversely, when the organism must eliminate excess water, such as after excess fluid drinking, the production of ADH is decreased and the collecting tubule becomes less permeable to water, rendering urine dilute and abundant. Failure of the organism to decrease ADH production appropriately may lead to water retention and dangerous dilution of body fluids, which in turn may cause severe neurological damage.  Failure to produce ADH (or inability of the collecting ducts to respond to it) may cause excessive urination, called [[diabetes insipidus]].
-{{ClinPsy}}
-After being processed along the collecting tubules and ducts, the fluid, now called [[urine]], is drained into the [[urinary bladder|bladder]] via the [[ureter]], to be finally excluded from the organism.
-==Functions==
-{{main|Renal physiology}}
-===Excretion of waste products===
-The kidneys excrete a variety of waste products produced by metabolism, for example, urea (from protein catabolism) and uric acid (from nucleic acid metabolism).
-===Homeostasis===
-'''Acid-Base Balance'''
-The kidneys regulate the [[pH]], mineral ion concentration, and water composition of the blood.
-By exchanging [[hydronium ions]] and [[hydroxyl|hydroxyl ions]], the blood plasma is maintained by the kidney at pH 7.4. Urine, on the other hand, becomes either acidic at pH 5 or alkaline at pH 8.
-The pH is maintained through four main [[protein]] transporters: NHE3 (a [[sodium]]-[[hydrogen]] exchanger), V-type H-ATPase (an [[isoform]] of the hydrogen ATPase), NBC1 (a sodium-[[bicarbonate]] cotransporter) and AE1 (an [[anion]] exchanger which exchanges chloride for bicarbonate). Due to the polar alignment of cells in the renal epithelia NHE3 and the H-ATPase are exposed to the [[lumen]] (which is essentially outside the body), on the [[apical]] side of the cells, and are responsible for excreting hydrogen ions (or protons). Conversely, NBC1 and AE1 are on the [[basolateral]] side of the cells, and allow bicarbonate ions to move back into the extracellular fluid and thus are returned to the blood plasma.
-'''Blood Pressure'''
-Sodium ions are controlled in a homeostatic process involving [[aldosterone]] which increases sodium ion absorption in the distal convoluted tubules.
-When blood pressure becomes low, a hormone called [[Renin]] is secreted by cells of the juxtaglomerular apparatus (part of the distal convoluted tubule) which are sensitive to pressure. Renin acts on a blood protein, angiotensinogen, converting it to angiotensin. Angiotensin stimulates the secretion of Aldosterone by the adrenal cortex, which affects the kidney tubules.
-Aldosterone stimulates an increase in the reabsorption of sodium ions from the kidney tubules which causes an increase in the volume of water that is reabsorbed from the tubule. This increase in water reabsorption increases the volume of blood which ultimately raises the blood pressure.
-'''Plasma Volume'''
-Any rise or drop in blood osmotic pressure due to a lack or excess of water is detected by the [[hypothalamus]], which notifies the [[pituitary gland]] via [[negative feedback]]. A lack of water causes the [[posterior pituitary gland]] to secrete [[antidiuretic hormone]], which results in water reabsorption and an increase in urine concentration. Tissue fluid concentration thus returns to a mean of 98%.
-===Hormone secretion===
-The kidneys secrete a variety of [[hormone]]s, including [[erythropoietin]], urodilatin and [[vitamin D]].
-==Terms==
-*'''[[renal capsule]]''': The membranous covering of the kidney.
-*'''[[cortex (anatomy)|cortex]]''': The outer layer over the internal medulla. It contains blood vessels, glomeruli (which are the kidneys' "filters") and [[urine]] tubes and is supported by a fibrous matrix.
-*'''[[hilus]]''': The opening in the middle of the concave medial border for nerves and blood vessels to pass into the renal sinus.
-*'''[[renal column]]''': The structures which support the cortex. They consist of lines of blood vessels and urinary tubes and a fibrous material.
-*'''[[renal sinus]]''': The cavity which houses the renal pyramids.
-*'''[[calyx (kidney)|calyces]]''': The recesses in the internal medulla which hold the pyramids. They are used to subdivide the sections of the kidney. (singular - ''calyx'')
-*'''[[papillae]]''': The small conical projections along the wall of the [[renal sinus]]. They have openings through which urine passes into the calyces. (singular - [[papilla]])
-*'''[[renal pyramids]]''': The conical segments within the internal medulla. They contain the secreting apparatus and tubules and are also called ''[[malpighian pyramid]]s''.
-*'''[[renal artery]]''': Two renal arteries come from the [[aorta]], each connecting to a kidney. The artery divides into five branches, each of which leads to a ball of capillaries. The arteries supply (unfiltered) blood to the kidneys. The left kidney receives about 60% of the renal bloodflow.
-*'''[[renal vein]]''': The filtered blood returns to circulation through the renal veins which join into the [[inferior vena cava]].
-*'''[[renal pelvis]]''': Basically just a [[funnel]], the renal pelvis accepts the urine and channels it out of the hilus into the [[ureter]].
-*'''[[ureter]]''': A narrow tube 40 cm long and 4 mm in diameter. Passing from the renal pelvis out of the hilus and down to the [[urinary bladder|bladder]]. The ureter carries urine from the kidneys to the [[urinary bladder|bladder]] by means of [[peristalsis]].
-==Diseases and disorders==
-===Congenital===
 *[[Polycystic kidney disease]]
 *[[Congenital hydronephrosis]]
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 ==Dialysis and kidney transplants==
-Generally, humans can live normally with just one kidney. Only when the amount of functioning kidney tissue is greatly diminished will [[renal failure]] develop. If [[renal function]] is impaired, various forms of medications are used, while others are contraindicated. Provided that treatment is begun early, it may be possible to reverse chronic kidney failure due to diabetes or high blood pressure. If [[creatinine clearance]] (a measure of renal function) has fallen very low ("end-stage renal failure"), or if the renal dysfunction leads to severe symptoms, [[dialysis]] is commenced. Dialysis is a medical procedure, performed in various different forms, where the blood is filtered outside of the body.
+Generally, humans can live normally with just one kidney. Only when the amount of functioning kidney tissue is greatly diminished will [[renal failure]] develop. If [[renal function]] is impaired, various forms of medications are used, while others are contraindicated. Provided that treatment is begun early, it may be possible to reverse chronic kidney failure due to [[diabetes]] or high [[blood pressure]]. If [[creatinine clearance]] (a measure of renal function) has fallen very low ("end-stage renal failure"), or if the renal dysfunction leads to severe symptoms, [[dialysis]] is commenced. Dialysis is a medical procedure, performed in various different forms, where the blood is filtered outside of the body.
 [[Kidney transplantation]] is the only cure for end stage renal failure; dialysis, is a supportive treatment; a form of "buying time" to bridge the inevitable wait for a suitable organ.
-The first successful kidney transplant was announced on [[March 4]], [[1954]] at [[Peter Bent Brigham Hospital]] in [[Boston, Massachusetts|Boston]]. The surgery was performed by Dr. [[Joseph E. Murray]], who was awarded the [[Nobel Prize|Nobel Prize in Medicine]] in 1990 for this feat.
-There are two types of kidney transplants: living donor transplant and a cadaveric (dead donor) transplant. When a kidney from a living donor, usually a blood relative, is transplanted into the patient's body, the donor's blood group and tissue type must be judged compatible with the patient's, and extensive medical tests are done to determine the health of the donor. Before a cadaveric donor's organs can be transplanted, a series of medical tests have to be done to determine if the organs are healthy. Also, in some countries, the family of the donor must give its consent for the [[organ donation]]. In both cases, the recipient of the new organ needs to take drugs to suppress their [[immune system]] to help prevent their body from rejecting the new kidney [http://www.mayoclinic.org/kidney-transplant/livingdonor.html].
-==Medical terminology==
-* Medical terms related to the kidneys involve the prefixes ''renal-'' and ''nephro-''.
-* Surgical removal of the kidney is a ''[[nephrectomy]]'', while a ''radical nephrectomy'' is removal of the kidney, its surrounding tissue, lymph nodes, and potentially the adrenal gland. A radical nephrectomy is performed for removal of [[cancer]]s.
-==See also==
-*[[Urology]]
-*[[Nephrology]]
-*[[Nephropathy]]
-*[[Human anatomy]]
-*[[Kidney development]]
-{{kidney}}
-{{urinary system}}
-{{endocrine system}}
-[[Category:Organs]]
-[[Category:Abdomen]]
-[[Category:Endocrine system]]
-[[Category:Kidney]]
+[[Category:Kidney disease]]
-[[ca:Ronyó]]
+[[Category:Physical disorders]]
-[[cs:Ledvina]]
+[[Category:Urogenital disorders]]
-[[cy:Aren]]
-[[da:Nyre]]
-[[de:Niere]]
-[[es:Riñón]]
-[[eo:Reno]]
-[[fa:کلیه]]
-[[fr:Rein]]
-[[gl:Ril]]
-[[ko:콩팥]]
-[[id:Ginjal]]
-[[it:Rene]]
-[[he:כליות]]
-[[ku:Gurçik]]
-[[lt:Inkstas]]
-[[hu:Vese]]
-[[nl:Nier]]
-[[ja:腎臓]]
-[[no:Nyre]]
-[[pl:Nerka]]
-[[pt:Rim]]
-[[scn:Rini]]
-[[simple:Kidney]]
-[[sk:Oblička]]
-[[sr:Бубрег]]
-[[su:Ginjal]]
-[[fi:Munuainen]]
-[[sv:Njure]]
-[[zh:腎]]
-{{enWP|Kidney disorder}}