Kidney stone disease - wikipedia Kidney stone disease Kidney stone disease Synonyms Urolithiasis, kidney stone, renal calculus, nephrolith, kidney stone disease, A kidney stone, 8 millimeters ( 0.3 in ) in diameter Specialty Urology, nephrology Symptoms Severe pain in the lower back or abdomen, blood in the urine, vomiting, nausea Causes Genetics and environmental factors Diagnostic method Based on symptoms, urine testing, medical imaging Differential diagnosis Abdominal aortic aneurysm, diverticulitis, appendicitis, pyelonephritis Prevention Drinking fluids such that more than two liters of urine are produced per day Treatment Pain medication, extracorporeal shock wave lithotripsy, ureteroscopy, percutaneous nephrolithotomy Frequency 22.1 million ( 2015 ) Deaths 16,100 ( 2015 ) Kidney stone disease, also known as urolithiasis, is when a solid piece of material ( kidney stone ) occurs in the urinary tract. Kidney stones typically form in the kidney and leave the body in the urine stream. A small stone may pass without causing symptoms. If a stone grows to more than 5 millimeters ( 0.2 in ) it can cause blockage of the ureter resulting in severe pain in the lower back or abdomen. A stone may also result in blood in the urine, vomiting, or painful urination. About half of people will have another stone within ten years. Most stones form due to a combination of genetics and environmental factors. Risk factors include high urine calcium levels, obesity, certain foods, some medications, calcium supplements, hyperparathyroidism, gout and not drinking enough fluids. Stones form in the kidney when minerals in urine are at high concentration. The diagnosis is usually based on symptoms, urine testing, and medical imaging. Blood tests may also be useful. Stones are typically classified by their location : nephrolithiasis ( in the kidney ), ureterolithiasis ( in the ureter ), cystolithiasis ( in the bladder ), or by what they are made of ( calcium oxalate, uric acid, struvite, cystine ). In those who have had stones, prevention is by drinking fluids such that more than two liters of urine are produced per day. If this is not effective enough, thiazide diuretic, citrate, or allopurinol may be taken. It is recommended that soft drinks containing phosphoric acid ( typically colas ) be avoided. When a stone causes no symptoms, no treatment is needed. Otherwise pain control is usually the first measure, using medications such as nonsteroidal anti-inflammatory drugs or opioids. Larger stones may be helped to pass with the medication tamsulosin or may require procedures such as extracorporeal shock wave lithotripsy, ureteroscopy, or percutaneous nephrolithotomy. Between 1 % and 15 % of people globally are affected by kidney stones at some point in their life. In 2015, 22.1 million cases occurred, resulting in about 16,100 deaths. They have become more common in the Western world since the 1970s. Generally, more men are affected than women. Kidney stones have affected humans throughout history with descriptions of surgery to remove them dating from as early as 600 BC. Contents 1 Signs and symptoms 2 Risk factors 2.1 Calcium oxalate 2.2 Other electrolytes 2.3 Animal protein 2.4 Vitamins 2.5 Other 3 Pathophysiology 3.1 Hypocitraturia 3.2 Supersaturation of urine 3.3 Inhibitors of stone formation 4 Diagnosis 4.1 Imaging studies 4.2 Laboratory examination 4.3 Composition 4.3. 1 Calcium - containing stones 4.3. 2 Struvite stones 4.3. 3 Uric acid stones 4.3. 4 Other types 4.4 Location 4.5 Size 5 Prevention 5.1 Dietary measures 5.2 Urine alkalinization 5.3 Diuretics 5.4 Allopurinol 6 Treatment 6.1 Pain management 6.2 Medical expulsive therapy 6.3 Lithotripsy 6.4 Surgery 6.4. 1 Ureteroscopic surgery 7 Epidemiology 8 History 8.1 Etymology 9 Research directions 10 Children 11 Other animals 12 See also 13 References 13.1 Notes 14 External links Signs and symptoms Diagram showing the typical location of renal colic, below the rib cage to just above the pelvis The hallmark of a stone that obstructs the ureter or renal pelvis is excruciating, intermittent pain that radiates from the flank to the groin or to the inner thigh. This pain, known as renal colic, is often described as one of the strongest pain sensations known. Renal colic caused by kidney stones is commonly accompanied by urinary urgency, restlessness, hematuria, sweating, nausea, and vomiting. It typically comes in waves lasting 20 to 60 minutes caused by peristaltic contractions of the ureter as it attempts to expel the stone. The embryological link between the urinary tract, the genital system, and the gastrointestinal tract is the basis of the radiation of pain to the gonads, as well as the nausea and vomiting that are also common in urolithiasis. Postrenal azotemia and hydronephrosis can be observed following the obstruction of urine flow through one or both ureters. Pain in the lower - left quadrant can sometimes be confused with diverticulitis because the sigmoid colon overlaps the ureter, and the exact location of the pain may be difficult to isolate due to the close proximity of these two structures. Risk factors Dehydration from low fluid intake is a major factor in stone formation. Obesity is a leading risk factor as well. High dietary intake of animal protein, sodium, sugars including honey, refined sugars, fructose and high fructose corn syrup, oxalate, grapefruit juice, and apple juice may increase the risk of kidney stone formation. Kidney stones can result from an underlying metabolic condition, such as distal renal tubular acidosis, Dent 's disease, hyperparathyroidism, primary hyperoxaluria, or medullary sponge kidney. 3 -- 20 % of people who form kidney stones have medullary sponge kidney. Kidney stones are more common in people with Crohn 's disease ; Crohn 's disease is associated with hyperoxaluria and malabsorption of magnesium. A person with recurrent kidney stones may be screened for such disorders. This is typically done with a 24 - hour urine collection. The urine is analyzed for features that promote stone formation. Calcium oxalate A kidney stone ( yellow ) composed of calcium oxalate Calcium is one component of the most common type of human kidney stones, calcium oxalate. Some studies suggest that people who take calcium or vitamin D as a dietary supplement have a higher risk of developing kidney stones. In the United States, kidney stone formation was used as an indicator of excess calcium intake by the Reference Daily Intake committee for calcium in adults. In the early 1990s, a study conducted for the Women 's Health Initiative in the US found that postmenopausal women who consumed 1000 mg of supplemental calcium and 400 international units of vitamin D per day for seven years had a 17 % higher risk of developing kidney stones than subjects taking a placebo. The Nurses ' Health Study also showed an association between supplemental calcium intake and kidney stone formation. Unlike supplemental calcium, high intakes of dietary calcium do not appear to cause kidney stones and may actually protect against their development. This is perhaps related to the role of calcium in binding ingested oxalate in the gastrointestinal tract. As the amount of calcium intake decreases, the amount of oxalate available for absorption into the bloodstream increases ; this oxalate is then excreted in greater amounts into the urine by the kidneys. In the urine, oxalate is a very strong promoter of calcium oxalate precipitation -- about 15 times stronger than calcium. A 2004 study found that diets low in calcium are associated with a higher overall risk for kidney stone formation. For most individuals, other risk factors for kidney stones, such as high intakes of dietary oxalates and low fluid intake, play a greater role than calcium intake. Other electrolytes Calcium is not the only electrolyte that influences the formation of kidney stones. For example, by increasing urinary calcium excretion, high dietary sodium may increase the risk of stone formation. Drinking fluoridated tap water may increase the risk of kidney stone formation by a similar mechanism, though further epidemiologic studies are warranted to determine whether fluoride in drinking water is associated with an increased incidence of kidney stones. High dietary intake of potassium appears to reduce the risk of stone formation because potassium promotes the urinary excretion of citrate, an inhibitor of calcium crystal formation. Kidney stones are more likely to develop, and to grow larger, if a person has low dietary magnesium. Magnesium inhibits stone formation. Animal protein Diets in Western nations typically contain a large proportion of animal protein. Consumption of animal protein creates an acid load that increases urinary excretion of calcium and uric acid and reduced citrate. Urinary excretion of excess sulfurous amino acids ( e.g., cysteine and methionine ), uric acid, and other acidic metabolites from animal protein acidifies the urine, which promotes the formation of kidney stones. Low urinary - citrate excretion is also commonly found in those with a high dietary intake of animal protein, whereas vegetarians tend to have higher levels of citrate excretion. Low urinary citrate, too, promotes stone formation. Vitamins The evidence linking vitamin C supplements with an increased rate of kidney stones is inconclusive. The excess dietary intake of vitamin C might increase the risk of calcium - oxalate stone formation ; in practice, this is rarely encountered. The link between vitamin D intake and kidney stones is also tenuous. Excessive vitamin D supplementation may increase the risk of stone formation by increasing the intestinal absorption of calcium ; correction of a deficiency does not. Other There are no conclusive data demonstrating a cause - and - effect relationship between alcoholic beverage consumption and kidney stones. However, some people have theorized that certain behaviors associated with frequent and binge drinking can lead to dehydration, which can, in turn, lead to the development of kidney stones. The American Urological Association has projected that global warming will lead to an increased incidence of kidney stones in the United States by expanding the `` kidney stone belt '' of the southern United States. In one study, people with lymphoproliferative / myeloproliferative disorders who were treated with chemotherapy developed symptomatic kidney stones 1.8 % of the time. Pathophysiology Small crystals formed in the kidney. The most common crystals are made of calcium oxalate and they are generally 4 -- 5 mm. Staghorn kidney stones are considerably larger. 1. Calcium and oxalate come together to make the crystal nucleus. Supersaturation promotes their combination ( as does inhibition. ) 2. Continued deposition at the renal papillae leads to the growth of the kidney stones. 3. Kidney stones grow and collect debris. In the case where the kidney stones block all routes to the renal papillae, this can cause severe discomfort. 4. The complete staghorn stone forms and retention occurs. Smaller solids that break off can become trapped in the urinary glands causing discomfort. 5. Displaced stones travel through the ureter. If they can not be broken down, they must be physically removed by a surgeon. Hypocitraturia Hypocitraturia or low urinary - citrate excretion ( defined as less than 320 mg / day ) can cause kidney stones in up to 2 / 3 of cases. The protective role of citrate is linked to several mechanisms ; in fact, citrate reduces urinary supersaturation of calcium salts by forming soluble complexes with calcium ions and by inhibiting crystal growth and aggregation. The therapy with potassium citrate, or magnesium potassium citrate, is commonly prescribed in clinical practice in order to increase urinary citrate and to reduce stone formation rates. Supersaturation of urine When the urine becomes supersaturated ( when the urine solvent contains more solutes than it can hold in solution ) with one or more calculogenic ( crystal - forming ) substances, a seed crystal may form through the process of nucleation. Heterogeneous nucleation ( where there is a solid surface present on which a crystal can grow ) proceeds more rapidly than homogeneous nucleation ( where a crystal must grow in a liquid medium with no such surface ), because it requires less energy. Adhering to cells on the surface of a renal papilla, a seed crystal can grow and aggregate into an organized mass. Depending on the chemical composition of the crystal, the stone - forming process may proceed more rapidly when the urine pH is unusually high or low. Supersaturation of the urine with respect to a calculogenic compound is pH - dependent. For example, at a pH of 7.0, the solubility of uric acid in urine is 158 mg / 100 ml. Reducing the pH to 5.0 decreases the solubility of uric acid to less than 8 mg / 100 ml. The formation of uric - acid stones requires a combination of hyperuricosuria ( high urine uric - acid levels ) and low urine pH ; hyperuricosuria alone is not associated with uric - acid stone formation if the urine pH is alkaline. Supersaturation of the urine is a necessary, but not a sufficient, condition for the development of any urinary calculus. Supersaturation is likely the underlying cause of uric acid and cystine stones, but calcium - based stones ( especially calcium oxalate stones ) may have a more complex cause. Inhibitors of stone formation Normal urine contains chelating agents, such as citrate, that inhibit the nucleation, growth, and aggregation of calcium - containing crystals. Other endogenous inhibitors include calgranulin ( an S - 100 calcium - binding protein ), Tamm -- Horsfall protein, glycosaminoglycans, uropontin ( a form of osteopontin ), nephrocalcin ( an acidic glycoprotein ), pro thrombin F1 peptide, and bikunin ( uronic acid - rich protein ). The biochemical mechanisms of action of these substances have not yet been thoroughly elucidated. However, when these substances fall below their normal proportions, stones can form from an aggregation of crystals. Sufficient dietary intake of magnesium and citrate inhibits the formation of calcium oxalate and calcium phosphate stones ; in addition, magnesium and citrate operate synergistically to inhibit kidney stones. Magnesium 's efficacy in subduing stone formation and growth is dose - dependent. Diagnosis Diagnosis of kidney stones is made on the basis of information obtained from the history, physical examination, urinalysis, and radiographic studies. Clinical diagnosis is usually made on the basis of the location and severity of the pain, which is typically colicky in nature ( comes and goes in spasmodic waves ). Pain in the back occurs when calculi produce an obstruction in the kidney. Physical examination may reveal fever and tenderness at the costovertebral angle on the affected side. Imaging studies In people with a history of stones, those who are less than 50 years of age and are presenting with the symptoms of stones without any concerning signs do not require helical CT scan imaging. A CT scan is also not typically recommended in children. Otherwise a noncontrast helical CT scan with 5 millimeters ( 0.2 in ) sections is the diagnostic modality of choice in the radiographic evaluation of suspected nephrolithiasis. All stones are detectable on CT scans except very rare stones composed of certain drug residues in the urine, such as from indinavir. Calcium - containing stones are relatively radiodense, and they can often be detected by a traditional radiograph of the abdomen that includes the kidneys, ureters, and bladder ( KUB film ). Some 60 % of all renal stones are radiopaque. In general, calcium phosphate stones have the greatest density, followed by calcium oxalate and magnesium ammonium phosphate stones. Cystine calculi are only faintly radiodense, while uric acid stones are usually entirely radiolucent. Where a CT scan is unavailable, an intravenous pyelogram may be performed to help confirm the diagnosis of urolithiasis. This involves intravenous injection of a contrast agent followed by a KUB film. Uroliths present in the kidneys, ureters, or bladder may be better defined by the use of this contrast agent. Stones can also be detected by a retrograde pyelogram, where a similar contrast agent is injected directly into the distal ostium of the ureter ( where the ureter terminates as it enters the bladder ). Renal ultrasonography can sometimes be useful, because it gives details about the presence of hydronephrosis, suggesting that the stone is blocking the outflow of urine. Radiolucent stones, which do not appear on KUB, may show up on ultrasound imaging studies. Other advantages of renal ultrasonography include its low cost and absence of radiation exposure. Ultrasound imaging is useful for detecting stones in situations where X-rays or CT scans are discouraged, such as in children or pregnant women. Despite these advantages, renal ultrasonography in 2009 was not considered a substitute for noncontrast helical CT scan in the initial diagnostic evaluation of urolithiasis. The main reason for this is that, compared with CT, renal ultrasonography more often fails to detect small stones ( especially ureteral stones ) and other serious disorders that could be causing the symptoms. A 2014 study confirmed that ultrasonography rather than CT as an initial diagnostic test results in less radiation exposure and did not find any significant complications. Bilateral kidney stones can be seen on this KUB radiograph. There are phleboliths in the pelvis, which can be misinterpreted as bladder stones. Axial CT scan of abdomen without contrast, showing a 3 - mm stone ( marked by an arrow ) in the left proximal ureter Renal ultrasonograph of a stone located at the pyeloureteric junction with accompanying hydronephrosis. Measurement of a 5.6 mm large kidney stone in soft tissue versus skeletal CT window. Laboratory examination Struvite crystals found on microscopic examination of the urine Laboratory investigations typically carried out include : microscopic examination of the urine, which may show red blood cells, bacteria, leukocytes, urinary casts, and crystals ; urine culture to identify any infecting organisms present in the urinary tract and sensitivity to determine the susceptibility of these organisms to specific antibiotics ; complete blood count, looking for neutrophilia ( increased neutrophil granulocyte count ) suggestive of bacterial infection, as seen in the setting of struvite stones ; renal function tests to look for abnormally high blood calcium blood levels ( hypercalcemia ) ; 24 hour urine collection to measure total daily urinary volume, magnesium, sodium, uric acid, calcium, citrate, oxalate, and phosphate ; collection of stones ( by urinating through a StoneScreen kidney stone collection cup or a simple tea strainer ) is useful. Chemical analysis of collected stones can establish their composition, which in turn can help to guide future preventive and therapeutic management. Composition Kidney stone type Population Circumstances Color Sensitivity Details Calcium oxalate 80 % when urine is acidic ( decreased pH ) Black / dark brown Radio - opaque Some of the oxalate in urine is produced by the body. Calcium and oxalate in the diet play a part but are not the only factors that affect the formation of calcium oxalate stones. Dietary oxalate is found in many vegetables, fruits, and nuts. Calcium from bone may also play a role in kidney stone formation. Calcium phosphate 5 -- 10 % when urine is alkaline ( high pH ) Dirty white Radio - opaque Tends to grow in alkaline urine especially when proteus bacteria are present. Uric acid 5 -- 10 % when urine is persistently acidic Yellow / reddish brown Radiolucent Diets rich in animal proteins and purines : substances found naturally in all food but especially in organ meats, fish, and shellfish. Struvite 10 -- 15 % infections in the kidney Dirty white Radio - opaque Prevention of struvite stones depends on staying infection - free. Diet has not been shown to affect struvite stone formation. Cystine 1 -- 2 % rare genetic disorder Pink / yellow Radio - opaque Cystine, an amino acid ( one of the building blocks of protein ), leaks through the kidneys and into the urine to form crystals. Xanthine Extremely rare Brick red Radiolucent Scanning electron micrograph of the surface of a kidney stone showing tetragonal crystals of Weddellite ( calcium oxalate dihydrate ) emerging from the amorphous central part of the stone ( the horizontal length of the picture represents 0.5 mm of the figured original ) Multiple kidney stones composed of uric acid and a small amount of calcium oxalate A lenticular kidney stone, excreted in the urine Calcium - containing stones By far, the most common type of kidney stones worldwide contains calcium. For example, calcium - containing stones represent about 80 % of all cases in the United States ; these typically contain calcium oxalate either alone or in combination with calcium phosphate in the form of apatite or brushite. Factors that promote the precipitation of oxalate crystals in the urine, such as primary hyperoxaluria, are associated with the development of calcium oxalate stones. The formation of calcium phosphate stones is associated with conditions such as hyperparathyroidism and renal tubular acidosis. Oxaluria is increased in patients with certain gastrointestinal disorders including inflammatory bowel disease such as Crohn 's disease or in patients who have undergone resection of the small bowel or small - bowel bypass procedures. Oxaluria is also increased in patients who consume increased amounts of oxalate ( found in vegetables and nuts ). Primary hyperoxaluria is a rare autosomal recessive condition that usually presents in childhood. Calcium oxalate crystals in urine appear as ' envelopes ' microscopically. They may also form ' dumbbells. ' Struvite stones About 10 -- 15 % of urinary calculi are composed of struvite ( ammonium magnesium phosphate, NH MgPO 6H O ). Struvite stones ( also known as `` infection stones, '' urease, or triple - phosphate stones ) form most often in the presence of infection by urea - splitting bacteria. Using the enzyme urease, these organisms metabolize urea into ammonia and carbon dioxide. This alkalinizes the urine, resulting in favorable conditions for the formation of struvite stones. Proteus mirabilis, Proteus vulgaris, and Morganella morganii are the most common organisms isolated ; less common organisms include Ureaplasma urealyticum and some species of Providencia, Klebsiella, Serratia, and Enterobacter. These infection stones are commonly observed in people who have factors that predispose them to urinary tract infections, such as those with spinal cord injury and other forms of neurogenic bladder, ileal conduit urinary diversion, vesicoureteral reflux, and obstructive uropathies. They are also commonly seen in people with underlying metabolic disorders, such as idiopathic hypercalciuria, hyperparathyroidism, and gout. Infection stones can grow rapidly, forming large calyceal staghorn ( antler - shaped ) calculi requiring invasive surgery such as percutaneous nephrolithotomy for definitive treatment. Struvite stones ( triple - phosphate / magnesium ammonium phosphate ) have a ' coffin lid ' morphology by microscopy. Uric acid stones About 5 -- 10 % of all stones are formed from uric acid. People with certain metabolic abnormalities, including obesity, may produce uric acid stones. They also may form in association with conditions that cause hyperuricosuria ( an excessive amount of uric acid in the urine ) with or without hyperuricemia ( an excessive amount of uric acid in the serum ). They may also form in association with disorders of acid / base metabolism where the urine is excessively acidic ( low pH ), resulting in precipitation of uric acid crystals. A diagnosis of uric acid urolithiasis is supported by the presence of a radiolucent stone in the face of persistent urine acidity, in conjunction with the finding of uric acid crystals in fresh urine samples. As noted above ( section on calcium oxalate stones ), people with inflammatory bowel disease ( Crohn 's disease, ulcerative colitis ) tend to have hyperoxaluria and form oxalate stones. They also have a tendency to form urate stones. Urate stones are especially common after colon resection. Uric acid stones appear as pleomorphic crystals, usually diamond - shaped. They may also look like squares or rods which are polarizable. Patients with hyperuricosuria can be treated with allopurinol, which will reduce urate formation. Urine alkalinization may also be helpful in this setting. Other types People with certain rare inborn errors of metabolism have a propensity to accumulate crystal - forming substances in their urine. For example, those with cystinuria, cystinosis, and Fanconi syndrome may form stones composed of cystine. Cystine stone formation can be treated with urine alkalinization and dietary protein restriction. People afflicted with xanthinuria often produce stones composed of xanthine. People afflicted with adenine phosphoribosyltransferase deficiency may produce 2, 8 - dihydroxyadenine stones, alkaptonurics produce homogentisic acid stones, and iminoglycinurics produce stones of glycine, proline, and hydroxyproline. Urolithiasis has also been noted to occur in the setting of therapeutic drug use, with crystals of drug forming within the renal tract in some people currently being treated with agents such as indinavir, sulfadiazine, and triamterene. Location Illustration of kidney stones Urolithiasis refers to stones originating anywhere in the urinary system, including the kidneys and bladder. Nephrolithiasis refers to the presence of such stones in the kidneys. Calyceal calculi are aggregations in either the minor or major calyx, parts of the kidney that pass urine into the ureter ( the tube connecting the kidneys to the urinary bladder ). The condition is called ureterolithiasis when a calculus is located in the ureter. Stones may also form or pass into the bladder, a condition referred to as bladder stones. Size Radiograph showing a large staghorn calculus involving the major calyces and renal pelvis in a person with severe scoliosis. Stones less than 5 mm ( 0.2 in ) in diameter pass spontaneously in up to 98 % of cases, while those measuring 5 to 10 mm ( 0.2 to 0.4 in ) in diameter pass spontaneously in less than 53 % of cases. Stones that are large enough to fill out the renal calyces are called staghorn stones, and are composed of struvite in a vast majority of cases, which forms only in the presence of urease - forming bacteria. Other forms that can possibly grow to become staghorn stones are those composed of cystine, calcium oxalate monohydrate, and uric acid. Prevention Preventative measures depend on the type of stones. In those with calcium stones, drinking lots of fluids, thiazide diuretics and citrate are effective as is allopurinol in those with high uric acid levels in the blood or urine. Dietary measures Specific therapy should be tailored to the type of stones involved. Diet can have a profound influence on the development of kidney stones. Preventive strategies include some combination of dietary modifications and medications with the goal of reducing the excretory load of calculogenic compounds on the kidneys. Current dietary recommendations to minimize the formation of kidney stones include : Increasing total fluid intake to more than two liters per day of urine output. Increasing citric acid intake ; lemon / lime juice is the richest natural source. Moderate calcium intake Limiting sodium intake Avoidance of large doses of supplemental vitamin C Limiting animal protein intake to no more than two meals daily ( an association between animal protein consumption and recurrence of kidney stones has been shown in men ). Limiting consumption of cola soft drinks, which contain phosphoric acid, to less than one liter of soft drink per week. Maintenance of dilute urine by means of vigorous fluid therapy is beneficial in all forms of nephrolithiasis, so increasing urine volume is a key principle for the prevention of kidney stones. Fluid intake should be sufficient to maintain a urine output of at least 2 litres ( 68 US fl oz ) per day. A high fluid intake has been associated with a 40 % reduction in recurrence risk. The quality of the evidence for this, however, is not very good. Calcium binds with available oxalate in the gastrointestinal tract, thereby preventing its absorption into the bloodstream, and reducing oxalate absorption decreases kidney stone risk in susceptible people. Because of this, some nephrologists and urologists recommend chewing calcium tablets during meals containing oxalate foods. Calcium citrate supplements can be taken with meals if dietary calcium can not be increased by other means. The preferred calcium supplement for people at risk of stone formation is calcium citrate because it helps to increase urinary citrate excretion. Aside from vigorous oral hydration and consumption of more dietary calcium, other prevention strategies include avoidance of large doses of supplemental vitamin C and restriction of oxalate - rich foods such as leaf vegetables, rhubarb, soy products and chocolate. However, no randomized, controlled trial of oxalate restriction has yet been performed to test the hypothesis that oxalate restriction reduces the incidence of stone formation. Some evidence indicates magnesium intake decreases the risk of symptomatic nephrolithiasis. Urine alkalinization The mainstay for medical management of uric acid stones is alkalinization ( increasing the pH ) of the urine. Uric acid stones are among the few types amenable to dissolution therapy, referred to as chemolysis. Chemolysis is usually achieved through the use of oral medications, although in some cases, intravenous agents or even instillation of certain irrigating agents directly onto the stone can be performed, using antegrade nephrostomy or retrograde ureteral catheters. Acetazolamide ( Diamox ) is a medication that alkalinizes the urine. In addition to acetazolamide or as an alternative, certain dietary supplements are available that produce a similar alkalinization of the urine. These include sodium bicarbonate, potassium citrate, magnesium citrate, and Bicitra ( a combination of citric acid monohydrate and sodium citrate dihydrate ). Aside from alkalinization of the urine, these supplements have the added advantage of increasing the urinary citrate level, which helps to reduce the aggregation of calcium oxalate stones. Increasing the urine pH to around 6.5 provides optimal conditions for dissolution of uric acid stones. Increasing the urine pH to a value higher than 7.0 increases the risk of calcium phosphate stone formation. Testing the urine periodically with nitrazine paper can help to ensure the urine pH remains in this optimal range. Using this approach, stone dissolution rate can be expected to be around 10 mm ( 0.4 in ) of stone radius per month. Diuretics One of the recognized medical therapies for prevention of stones is the thiazide and thiazide - like diuretics, such as chlorthalidone or indapamide. These drugs inhibit the formation of calcium - containing stones by reducing urinary calcium excretion. Sodium restriction is necessary for clinical effect of thiazides, as sodium excess promotes calcium excretion. Thiazides work best for renal leak hypercalciuria ( high urine calcium levels ), a condition in which high urinary calcium levels are caused by a primary kidney defect. Thiazides are useful for treating absorptive hypercalciuria, a condition in which high urinary calcium is a result of excess absorption from the gastrointestinal tract. Allopurinol For people with hyperuricosuria and calcium stones, allopurinol is one of the few treatments that have been shown to reduce kidney stone recurrences. Allopurinol interferes with the production of uric acid in the liver. The drug is also used in people with gout or hyperuricemia ( high serum uric acid levels ). Dosage is adjusted to maintain a reduced urinary excretion of uric acid. Serum uric acid level at or below 6 mg / 100 ml ) is often a therapeutic goal. Hyperuricemia is not necessary for the formation of uric acid stones ; hyperuricosuria can occur in the presence of normal or even low serum uric acid. Some practitioners advocate adding allopurinol only in people in whom hyperuricosuria and hyperuricemia persist, despite the use of a urine - alkalinizing agent such as sodium bicarbonate or potassium citrate. Treatment Stone size influences the rate of spontaneous stone passage. For example, up to 98 % of small stones ( less than 5 mm ( 0.2 in ) in diameter ) may pass spontaneously through urination within four weeks of the onset of symptoms, but for larger stones ( 5 to 10 mm ( 0.2 to 0.4 in ) in diameter ), the rate of spontaneous passage decreases to less than 53 %. Initial stone location also influences the likelihood of spontaneous stone passage. Rates increase from 48 % for stones located in the proximal ureter to 79 % for stones located at the vesicoureteric junction, regardless of stone size. Assuming no high - grade obstruction or associated infection is found in the urinary tract, and symptoms are relatively mild, various nonsurgical measures can be used to encourage the passage of a stone. Repeat stone formers benefit from more intense management, including proper fluid intake and use of certain medications. In addition, careful surveillance is clearly required to maximize the clinical course for people who are stone formers. Pain management Management of pain often requires intravenous administration of NSAIDs or opioids. NSAIDs appear somewhat better than opioids or paracetamol in those with normal kidney function. Medications by mouth are often effective for less severe discomfort. The use of antispasmodics does not have further benefit. Medical expulsive therapy The use of medications to speed the spontaneous passage of stones in the ureter is referred to as medical expulsive therapy. Several agents, including alpha adrenergic blockers ( such as tamsulosin ) and calcium channel blockers ( such as nifedipine ), have been found to be effective. Alpha blockers appear to lead to both higher and faster stone clearance rates. Alpha blockers ; however, only appear to be effective for stones over 4 mm but less than 10 mm in size. A combination of tamsulosin and a corticosteroid may be better than tamsulosin alone. These treatments also appear to be a useful in addition to lithotripsy. Lithotripsy A lithotriptor machine is seen in an operating room ; other equipment is seen in the background, including an anesthesia machine and a mobile fluoroscopic system ( or `` C - arm '' ). Extracorporeal shock wave lithotripsy ( ESWL ) is a noninvasive technique for the removal of kidney stones. Most ESWL is carried out when the stone is present near the renal pelvis. ESWL involves the use of a lithotriptor machine to deliver externally applied, focused, high - intensity pulses of ultrasonic energy to cause fragmentation of a stone over a period of around 30 -- 60 minutes. Following its introduction in the United States in February 1984, ESWL was rapidly and widely accepted as a treatment alternative for renal and ureteral stones. It is currently used in the treatment of uncomplicated stones located in the kidney and upper ureter, provided the aggregate stone burden ( stone size and number ) is less than 20 mm ( 0.8 in ) and the anatomy of the involved kidney is normal. For a stone greater than 10 mm ( 0.4 in ), ESWL may not help break the stone in one treatment ; instead, two or three treatments may be needed. Some 80 to 85 % of simple renal calculi can be effectively treated with ESWL. A number of factors can influence its efficacy, including chemical composition of the stone, presence of anomalous renal anatomy and the specific location of the stone within the kidney, presence of hydronephrosis, body mass index, and distance of the stone from the surface of the skin. Common adverse effects of ESWL include acute trauma, such as bruising at the site of shock administration, and damage to blood vessels of the kidney. In fact, the vast majority of people who are treated with a typical dose of shock waves using currently accepted treatment settings are likely to experience some degree of acute kidney injury. ESWL - induced acute kidney injury is dose - dependent ( increases with the total number of shock waves administered and with the power setting of the lithotriptor ) and can be severe, including internal bleeding and subcapsular hematomas. On rare occasions, such cases may require blood transfusion and even lead to acute renal failure. Hematoma rates may be related to the type of lithotriptor used ; hematoma rates of less than 1 % and up to 13 % have been reported for different lithotriptor machines. Recent studies show reduced acute tissue injury when the treatment protocol includes a brief pause following the initiation of treatment, and both improved stone breakage and a reduction in injury when ESWL is carried out at slow shock wave rate. In addition to the aforementioned potential for acute kidney injury, animal studies suggest these acute injuries may progress to scar formation, resulting in loss of functional renal volume. Recent prospective studies also indicate elderly people are at increased risk of developing new - onset hypertension following ESWL. In addition, a retrospective case - control study published by researchers from the Mayo Clinic in 2006 has found an increased risk of developing diabetes mellitus and hypertension in people who had undergone ESWL, compared with age and gender - matched people who had undergone nonsurgical treatment. Whether or not acute trauma progresses to long - term effects probably depends on multiple factors that include the shock wave dose ( i.e., the number of shock waves delivered, rate of delivery, power setting, acoustic characteristics of the particular lithotriptor, and frequency of retreatment ), as well as certain intrinsic predisposing pathophysiologic risk factors. To address these concerns, the American Urological Association established the Shock Wave Lithotripsy Task Force to provide an expert opinion on the safety and risk - benefit ratio of ESWL. The task force published a white paper outlining their conclusions in 2009. They concluded the risk - benefit ratio remains favorable for many people. The advantages of ESWL include its noninvasive nature, the fact that it is technically easy to treat most upper urinary tract calculi, and that, at least acutely, it is a well - tolerated, low - morbidity treatment for the vast majority of people. However, they recommended slowing the shock wave firing rate from 120 pulses per minute to 60 pulses per minute to reduce the risk of renal injury and increase the degree of stone fragmentation. Surgery Three - dimensional reconstructed CT scan image of a ureteral stent in the left kidney ( indicated by yellow arrow ), with a kidney stone in the inferior renal pelvis ( highest red arrow ) and one in the ureter beside the stent ( lower red arrow ) A kidney stone at the tip of an ultrasonic stone disintegration apparatus Most stones under 5 mm ( 0.2 in ) pass spontaneously. Prompt surgery may, nonetheless, be required in persons with only one working kidney, bilateral obstructing stones, a urinary tract infection and thus, it is presumed, an infected kidney, or intractable pain. Beginning in the mid-1980s, less invasive treatments such as extracorporeal shock wave lithotripsy, ureteroscopy, and percutaneous nephrolithotomy began to replace open surgery as the modalities of choice for the surgical management of urolithiasis. More recently, flexible ureteroscopy has been adapted to facilitate retrograde nephrostomy creation for percutaneous nephrolithotomy. This approach is still under investigation, though early results are favorable. Percutaneous nephrolithotomy or, rarely, anatrophic nephrolithotomy, is the treatment of choice for large or complicated stones ( such as calyceal staghorn calculi ) or stones that can not be extracted using less invasive procedures. Ureteroscopic surgery Ureteroscopy has become increasingly popular as flexible and rigid fiberoptic ureteroscopes have become smaller. One ureteroscopic technique involves the placement of a ureteral stent ( a small tube extending from the bladder, up the ureter and into the kidney ) to provide immediate relief of an obstructed kidney. Stent placement can be useful for saving a kidney at risk for postrenal acute renal failure due to the increased hydrostatic pressure, swelling and infection ( pyelonephritis and pyonephrosis ) caused by an obstructing stone. Ureteral stents vary in length from 24 to 30 cm ( 9.4 to 11.8 in ) and most have a shape commonly referred to as a `` double - J '' or `` double pigtail '', because of the curl at both ends. They are designed to allow urine to flow past an obstruction in the ureter. They may be retained in the ureter for days to weeks as infections resolve and as stones are dissolved or fragmented by ESWL or by some other treatment. The stents dilate the ureters, which can facilitate instrumentation, and they also provide a clear landmark to aid in the visualization of the ureters and any associated stones on radiographic examinations. The presence of indwelling ureteral stents may cause minimal to moderate discomfort, frequency or urgency incontinence, and infection, which in general resolves on removal. Most ureteral stents can be removed cystoscopically during an office visit under topical anesthesia after resolution of urolithiasis. More definitive ureteroscopic techniques for stone extraction ( rather than simply bypassing the obstruction ) include basket extraction and ultrasound ureterolithotripsy. Laser lithotripsy is another technique, which involves the use of a holmium : yttrium aluminium garnet ( Ho : YAG ) laser to fragment stones in the bladder, ureters, and kidneys. Ureteroscopic techniques are generally more effective than ESWL for treating stones located in the lower ureter, with success rates of 93 -- 100 % using Ho : YAG laser lithotripsy. Although ESWL has been traditionally preferred by many practitioners for treating stones located in the upper ureter, more recent experience suggests ureteroscopic techniques offer distinct advantages in the treatment of upper ureteral stones. Specifically, the overall success rate is higher, fewer repeat interventions and postoperative visits are needed, and treatment costs are lower after ureteroscopic treatment when compared with ESWL. These advantages are especially apparent with stones greater than 10 mm ( 0.4 in ) in diameter. However, because ureteroscopy of the upper ureter is much more challenging than ESWL, many urologists still prefer to use ESWL as a first - line treatment for stones of less than 10 mm, and ureteroscopy for those greater than 10 mm in diameter. Ureteroscopy is the preferred treatment in pregnant and morbidly obese people, as well as those with bleeding disorders. Epidemiology. Country Earliest prevalence ( years ) Latest prevalence ( years ) United States 2.6 % ( 1964 -- 1972 ) 5.2 % ( 1988 -- 1994 ) Italy 1.2 % ( 1983 ) 1.7 % ( 1993 -- 1994 ) Scotland 3.8 % ( 1977 ) 3.5 % ( 1987 ) Spain 0.1 % ( 1977 ) 10.0 % ( 1991 ) Turkey n / a 14.8 % ( 1989 ) Country New cases per 100,000 ( year ) Trend United States 116 ( 2000 ) decreasing Germany 720 ( 2000 ) increasing Japan 114.3 ( 2005 ) increasing Spain 270 ( 1984 ) decreasing Sweden 200 ( 1969 ) increasing Urolithiasis deaths per million persons in 2012 0 -- 0 1 -- 1 2 -- 2 3 -- 3 4 -- 20 Kidney stones affect all geographical, cultural, and racial groups. The lifetime risk is about 10 to 15 % in the developed world, but can be as high as 20 to 25 % in the Middle East. The increased risk of dehydration in hot climates, coupled with a diet 50 % lower in calcium and 250 % higher in oxalates compared to Western diets, accounts for the higher net risk in the Middle East. In the Middle East, uric acid stones are more common than calcium - containing stones. The number of deaths due to kidney stones is estimated at 19,000 per year being fairly consistent between 1990 and 2010. In North America and Europe, the annual number of new cases per year of kidney stones is roughly 0.5 %. In the United States, the frequency in the population of urolithiasis has increased from 3.2 % to 5.2 % from the mid-1970s to the mid-1990s. In the United States, about 9 % of the population has had a kidney stone. The total cost for treating urolithiasis was US $2 billion in 2003. About 65 -- 80 % of those with kidney stones are men ; most stones in women are due to either metabolic defects ( such as cystinuria ) or infection. ( p. 1057 ) Men most commonly experience their first episode between 30 and 40 years of age, whereas for women, the age at first presentation is somewhat later. The age of onset shows a bimodal distribution in women, with episodes peaking at 35 and 55 years. Recurrence rates are estimated at 50 % over a 10 - year and 75 % over 20 - year period, with some people experiencing ten or more episodes over the course of a lifetime. A 2010 review concluded that rates of disease are increasing. History See also : List of kidney stone formers The existence of kidney stones was first recorded thousands of years ago, and lithotomy for the removal of stones is one of the earliest known surgical procedures. In 1901, a stone discovered in the pelvis of an ancient Egyptian mummy was dated to 4,800 BC. Medical texts from ancient Mesopotamia, India, China, Persia, Greece, and Rome all mentioned calculous disease. Part of the Hippocratic Oath suggests there were practicing surgeons in ancient Greece to whom physicians were to defer for lithotomies. The Roman medical treatise De Medicina by Aulus Cornelius Celsus contained a description of lithotomy, and this work served as the basis for this procedure until the 18th century. Famous people who were kidney stone formers include Napoleon I, Epicurus, Napoleon III, Peter the Great, Louis XIV, George IV, Oliver Cromwell, Lyndon B. Johnson, Benjamin Franklin, Michel de Montaigne, Francis Bacon, Isaac Newton, Samuel Pepys, William Harvey, Herman Boerhaave, and Antonio Scarpa. New techniques in lithotomy began to emerge starting in 1520, but the operation remained risky. After Henry Jacob Bigelow popularized the technique of litholapaxy in 1878, the mortality rate dropped from about 24 % to 2.4 %. However, other treatment techniques continued to produce a high level of mortality, especially among inexperienced urologists. In 1980, Dornier MedTech introduced extracorporeal shock wave lithotripsy for breaking up stones via acoustical pulses, and this technique has since come into widespread use. Etymology Renal calculus is from the Latin rēnēs meaning `` kidneys, '' and calculus meaning `` pebble ''. Lithiasis ( stone formation ) in the kidneys is called nephrolithiasis ( / ˌnɛfroʊlɪˈθaɪəsɪs / ), from nephro - meaning kidney + - lith meaning stone and - iasis meaning disorder. Research directions Crystallization of calcium oxalate appears to be inhibited by certain substances in the urine that retard the formation, growth, aggregation, and adherence of crystals to renal cells. By purifying urine using salt precipitation, isoelectric focusing, and size - exclusion chromatography, some researchers have found that calgranulin, a protein formed in the kidney, is a potent inhibitor of the in vivo formation of calcium oxalate crystals. Considering its extremely high levels of inhibition of growth and aggregation of calcium oxalate crystals, calgranulin might be an important intrinsic factor in the prevention of nephrolithiasis. Children Although kidney stones do not often occur in children, the incidence is increasing. These stones are in the kidney in two thirds of reported cases, and in the ureter in the remaining cases. Older children are at greater risk independent of sex. As with adults, most pediatric kidney stones are predominantly composed of calcium oxalate ; struvite and calcium phosphate stones are less common. Calcium oxalate stones in children are associated with high amounts of calcium, oxalate, and magnesium in acidic urine. Other animals Among ruminants, uroliths more commonly cause problems in males than in females ; the sigmoid flexure of the ruminant male urinary tract is more likely to obstruct passage. Early - castrated males are at greater risk, because of lesser urethral diameter. Low Ca :P intake ratio is conducive to phosphatic ( e.g. struvite ) urolith formation. Incidence among wether lambs can be minimized by maintaining a dietary Ca :P intake ratio of 2 : 1. Alkaline pH favors formation of carbonate and phosphate calculi. For domestic ruminants, dietary cation : anion balance is sometimes adjusted to assure a slightly acidic urine pH, for prevention of calculus formation Differing generalizations regarding effects of pH on formation of silicate uroliths may be found. In this connection, it may be noted that under some circumstances, calcium carbonate accompanies silica in siliceous uroliths. Pelleted feeds may be conducive to formation of phosphate uroliths, because of increased urinary phosphorus excretion. This is attributable to lower saliva production where pelleted rations containing finely ground constituents are fed. With less blood phosphate partitioned into saliva, more tends to be excreted in urine. ( Most saliva phosphate is fecally excreted. ) Oxalate uroliths can occur in ruminants, although such problems from oxalate ingestion may be relatively uncommon. Ruminant urolithiasis associated with oxalate ingestion has been reported. However, no renal tubular damage or visible deposition of calcium oxalate crystals in kidneys was found in yearling wether sheep fed diets containing soluble oxalate at 6.5 percent of dietary dry matter for about 100 days. Conditions limiting water intake can result in stone formation. Various surgical interventions, e.g. amputation of the urethral process at its base near the glans penis in male ruminants, perineal urethrostomy, or tube cystostomy may be considered for relief of obstructive urolithiasis. See also Nephrocalcinosis References ^ Jump up to : Schulsinger, David A. ( 2014 ). Kidney Stone Disease : Say NO to Stones !. Springer. p. 27. ISBN 9783319121055. 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London : Springer - Verlag. doi : 10.1007 / 978 - 1 - 84800 - 362 - 0_26. ISBN 978 - 1 - 84800 - 361 - 3. Reilly Jr., RF ; Perazella, MA, eds. ( 2005 ). Nephrology in 30 Days ( 1st ed. ). New York : The McGraw - Hill Companies, Inc. ISBN 0 - 07 - 143701 - 0. Stoller, ML ; Meng, MV, eds. ( 2007 ). Urinary stone disease : the practical guide to medical and surgical management ( 1st ed. ). Totowa, New Jersey : Humana Press. ISBN 978 - 1 - 59259 - 972 - 1. External links Classification ICD - 10 : N20. 0 -- N20. 9 ICD - 9 - CM : 592.0 -- 594.9 OMIM : 167030 MeSH : D052878 DiseasesDB : 11346 External resources MedlinePlus : 000458 eMedicine : med / 1600 Patient UK : Kidney stone disease Wikimedia Commons has media related to Kidney stones. Kidney stone disease at Curlie ( based on DMOZ ) Information from the European Urological Association Diseases of the urinary system ( N00 -- N39, 580 -- 599 ) Kidney disease Glomerules Primarily nephrotic Non-proliferative Minimal change Focal segmental Membranous Proliferative Mesangial proliferative Endocapillary proliferative Membranoproliferative / mesangiocapillary By condition Diabetic Amyloidosis Primarily nephritic, RPG Type I RPG / Type II hypersensitivity Goodpasture 's syndrome Type II RPG / Type III hypersensitivity Post-streptococcal Lupus DPGN IgA / Berger 's Type III RPG / Pauci - immune Granulomatosis with polyangiitis Microscopic polyangiitis Eosinophilic granulomatosis with polyangiitis General glomerulonephritis glomerulonephrosis Tubules Renal tubular acidosis proximal distal Acute tubular necrosis Genetic Fanconi syndrome Bartter syndrome Gitelman syndrome Liddle 's syndrome Interstitium Interstitial nephritis Pyelonephritis Balkan endemic nephropathy General General syndromes Nephritis Nephrosis Renal failure Acute renal failure Chronic kidney disease Uremic pericarditis Uremia Diabetes insipidus Nephrogenic Renal papilla Renal papillary necrosis Major calyx / pelvis Hydronephrosis Pyonephrosis Reflux nephropathy Vascular Renal artery stenosis Renal ischemia Hypertensive nephropathy Renovascular hypertension Renal cortical necrosis Other Analgesic nephropathy Renal osteodystrophy Nephroptosis Abderhalden -- Kaufmann -- Lignac syndrome Urinary tract Ureter Ureteritis Ureterocele Megaureter Bladder Cystitis Interstitial cystitis Hunner 's ulcer Trigonitis Hemorrhagic cystitis Neurogenic bladder dysfunction Bladder sphincter dyssynergia Vesicointestinal fistula Vesicoureteral reflux Urethra Urethritis Non-gonococcal urethritis Urethral syndrome Urethral stricture / Meatal stenosis Urethral caruncle Any / all Obstructive uropathy Urinary tract infection Retroperitoneal fibrosis Urolithiasis Bladder stone Kidney stone Renal colic Malakoplakia Urinary incontinence Stress Urge Overflow Retrieved from `` https://en.wikipedia.org/w/index.php?title=Kidney_stone_disease&oldid=843531065 '' Categories : Kidney diseases Urological conditions Hidden categories : CS1 maint : Extra text : authors list CS1 Japanese - language sources ( ja ) Webarchive template wayback links Good articles Infobox medical condition ( new ) All articles with specifically marked weasel - worded phrases Articles with specifically marked weasel - worded phrases from November 2013 All articles with unsourced statements Articles with unsourced statements from April 2015 All articles with dead external links Articles with dead external links from December 2016 Articles with Curlie links Use dmy dates from April 2018 RTT RTTEM Talk Contents About Wikipedia Afrikaans አማርኛ Azərbaycanca বাংলা Български Català Čeština Cymraeg Dansk Deutsch ދިވެހިބަސް Ελληνικά Español فارسی Français Gaeilge 한국어 हिन्दी Hrvatski Ido Bahasa Indonesia Interlingua Italiano עברית Basa Jawa Қазақша Latina Lietuvių Luganda Magyar Македонски मराठी Nederlands 日本 語 Norsk Oʻzbekcha / ўзбекча Polski Português Runa Simi Русский Sicilianu Slovenščina کوردی Српски / srpski Srpskohrvatski / српскохрватски Suomi Svenska தமிழ் ไทย Türkçe Українська Tiếng Việt ייִדיש 中文 46 more Edit links This page was last edited on 29 May 2018, at 19 : 04. 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Question: medical term meaning condition of stones in the ureters
Answer: urolithiasis