Abstract

LITHIASIS: THE CAUSATIVE SOURCES ARE UREATES AND OXALATES

Montu Barot, Urvashi Nayak, Khyati Pathak, Khushbu Patel and Prof. Dr. Dhrubo Jyoti Sen*

ABSTRACT

A calculus (plural calculi), often called a stone, is a concretion of material, usually mineral salts, that forms in an organ or duct of the body. Formation of calculi is known as lithiasis. Stones can cause a number of medical conditions. Some common principles apply to stones at any location, but for specifics of the particular stone type in question. Calculi are not to be confused with gastroliths. Calculi in the urinary system are called urinary calculi and include kidney stones (also called renal calculi or nephroliths) and bladder stones (also called vesical calculi or cystoliths). They can have any of several compositions, including mixed. Principal compositions include oxalate and ureate. Oxalic Acid Uric Acid Calculi of the gallbladder and bile ducts are called gallstones and are primarily developed from bile salts and cholesterol derivatives. Calculi in the nasal passages (rhinoliths) are rare. Calculi in the gastrointestinal tract (enteroliths) can be enormous. Individual enteroliths weighing many pounds have been reported in horses. Calculi in the salivary glands are called salivary calculi (sialoliths). Calculi in the tonsils are called tonsillar calculi (tonsilloliths). Calculi are usually asymptomatic and large calculi may have required many years to grow to their large size.  From an underlying abnormal excess of the mineral, e.g., with elevated levels of calcium (hypercalcaemia) that may cause kidney stones, dietary factors for gallstones.  Local conditions at the site in question that promote their formation, e.g., local bacteria action (in kidney stones) or slower fluid flow rates, a possible explanation of the majority of salivary duct calculus occurring in the sub-mandibular salivary gland.  Enteroliths are a type of calculus found in the intestines of animals (mostly ruminants) and humans and may be composed of inorganic or organic constituents.  Bezoars are lumps of indigestible material in the stomach and/or intestines; most commonly, they consist of hair (in which case they are also known as hairballs). A bezoar may form the nidus of an enterolith. In kidney stones, calcium oxalate is the most common mineral type (Nephrolithiasis). Uric acid is the second most common mineral type, but an in-vitro study showed uric acid stones and crystals can promote the formation of calcium oxalate stones. Stones can cause disease by several mechanisms: Irritation of nearby tissues, causing pain, swelling and inflammation; Obstruction of an opening or duct, interfering with normal flow and disrupting the function of the organ in question; Predisposition to infection (often due to disruption of normal flow). A number of important medical conditions are caused by stones: Nephrolithiasis (kidney stones), Can cause hydronephrosis (swollen kidneys) and renal failure, Can predispose to pyelonephritis (kidney infections), Can progress to urolithiasis, Urolithiasis (urinary bladder stones), Can progress to bladder outlet obstruction, Cholelithiasis (gallstones), Can predispose to cholecystitis (gall bladder infections) and ascending cholangitis (biliary tree infection), Canprogressto choledocholithiasis (gallstones in the bile duct) and gallstone pancreatitis (inflammation of the pancreas), Gastric calculi can cause colic, obstruction, torsion and necrosis, Diagnostic workup varies by the stone type, but in general: Clinical history and physical examination, Imaging studies, Some stone types (mainly those with substantial calcium content) can be detected on X-ray and CT scan, Many stone types can be detected by ultrasound. Factors contributing to stone formation (as in #Etiology) are often tested: Laboratory testing can give levels of relevant substances in blood or urine, Some stones can be directly recovered (at surgery, or when they leave the body spontaneously) and sent to a laboratory for analysis of content. Modification of predisposing factors cans sometimes slow or reverse stone formation. Treatment varies by stone type, but, in general: Medication, Surgery (lithotomy), Antibiotics and/or surgery for infections, Extra corporeal shock wave lithotripsy (ESWL) for removal of calculi.

Keywords: Calculi, Lithiasis, Nephrolith, Cystolith, Rhinolith, Enterolith, Sialolith, Tonsillolith, Urolith, Cholelith, Choledocholith, Bezoar.