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Hyperoxaluria and Renal Calculi Robin G Postgrad Med J: first published as 10.1136/pgmj.70.828.695 on 1 October 1994. Downloaded from Postgrad Med J (1994) 70, 695 - 698 i) The Fellowship of Postgraduate Medicine, 1994 Review Article Hyperoxaluria and renal calculi Robin G. Woolfson and Martin A. Mansell Division ofNephrology, St Peter's Institute of Urology and Nephrology, Middlesex Hospital, Mortimer Street, London WIN 8AA, UK Introduction Many Western countries are experiencing an urine at about 0.2-0.4 mmol/24 h. The solubility epidemic of renal calculi, causing immediate prob- of oxalate in water is only about 50 pmol/l so that lems with acute pain and morbidity together with the importance ofnaturally occurring inhibitors of worries for the future because of the likelihood of crystallization in urine, such as citrate and neph- recurrent stone formation. Renal or ureteric colic is rocalcin, is obvious. A typical diet contains the commonest surgical admission diagnosis in this 1-2 mmol oxalate per day, of which more than country and it has been suggested that up to 12 95% is precipitated in the gut lumen and excreted in million Americans will suffer a stone episode the form of insoluble calcium salts. Thus the during their lifetime.' Because of the scale of the absorption of oxalate from the gut lumen may clinical problem presented by renal colic, depend on the adequacy of the dietary intake of immediate and short-term management dominates calcium.'0 Most urinary oxalate is derived from the discussion with rather less attention paid to endogenous metabolism, although heavy con- analysis of the factors involved in stone formation sumption of oxalate rich foods such as nuts, copyright. and prevention of recurrence. In view of the chocolate, tea or spinach can introduce an impor- substantial costs of the treatment of kidney stones tant dietary component to hyperoxaluria, but this ($2 billion in 1986 in the USA alone2), this focus is unusual. The metabolism of glyoxylate and may not be altogether appropriate. glycine gives rise to oxalate, with lesser amounts Most upper tract stones are composed ofcalcium coming from hydroxyproline, other amino acids oxalate and the definition of 'idiopathic hypercal- and sugars. Although ascorbic acid is also a ciuria' some 60 years ago has tended to emphasize precursor it seems that this route is fairly limited, the importance ofincreased urinary calcium excre- because the consumption ofmega doses ofvitamin http://pmj.bmj.com/ tion in their aetiology. However, in the last 10-15 C (5-10 g per day) causes only mild hyperoxaluria. years, it has become clear that quite small changes Oxalate is a metabolic end product, the excretion in urinary oxalate levels may have profound effects of which is made entirely via the urine, apart from on the likelihood ofcalcium oxalate crystal forma- some possible intestinal excretion of trivial degree. tion and subsequent urolithiasis.3 The current It is not significantly protein bound so that it is interest in hyperoxaluria and its pathophysiology freely filtered at the glomerulus; additional secre- results from the development of accurate methods tion occurs in the tubule so that, in normal of measuring oxalate in blood and urine4'5 and individuals, oxalate clearance may be 50-100% on September 25, 2021 by guest. Protected advances in our understanding of the physical greater than that of creatinine."1 Sixty per cent of processes involved in urinary crystal formation.6 urinary oxalate forms a soluble complex with We review some current thinking on oxalate and sodium with the remainder forming a variety ofless renal calculi; a number of excellent recent reviews soluble calcium complexes. on the broader aspects of urolithiasis are also available.' 7-9 Factors in crystal fonnation Biochemistry of oxalate Normal urine is supersaturated with respect to Oxalic acid is a strong dicarboxylic acid present as many of its constituents such as oxalate, calcium, oxalate in plasma at 1-3 jtmol/l and excreted in the urate, phosphate, etc. All urine contains a variety of inhibitors of crystallization, of which the most important include citrate, nephrocalcin, Correspondence: M.A. Mansell, M.D., F.R.C.P. Tamm-Horsfall protein, magnesium and Received: 20 April 1994 glycosaminoglycans. Obviously, other factors such Postgrad Med J: first published as 10.1136/pgmj.70.828.695 on 1 October 1994. Downloaded from 696 R.G. WOOLFSON & M.A. MANSELL as urine pH, concentration and volume can have Table I Causes of hyperoxaluria major effects on other crystal-forming systems such as urate, calcium phosphate and cystine in addition Primary hyperoxaluria to the absolute concentrations of these various Type I (PHI) chemical constituents. Crystal formation is a com- Type 2 (PH2) plex, dynamic physical process that occurs when a Mild metabolic hyperoxaluria (PH3) variety of factors that favour precipitation of Secondary hyperoxaluria insoluble complexes dominate the inhibitors that Increased oxalate absorption - 'enteric hyperoxaluria' will favour their dissolution. These various pro- Small bowel disease, for example, Crohn's disease, jejuno-ileal bypass cesses can be examined by computer simulation Pancreatic failure and show, for example, that for calcium oxalate Increased endogenous oxalate synthesis crystallization small changes in oxalate concentra- Pyridoxine deficiency tions are very much more important than larger Excess oxalate or precursor intake increases in calcium concentration.'2 Oxalate (dietary) About half of all patients presenting with cal- Ascorbic acid cium oxalate calculi will be found to have Glycine (post-prostatectomy irrigation) idiopathic hypercalciuria; this diagnosis implies Ethylene glycol that hypercalcaemia and other disorders ofcalcium Methoxyflurane metabolism have been excluded and probably reflects either an increased renal tubular leak of calcium or elevated calcium absorption from the intestine.'3 In-patients with idiopathic hypercal- associated with renal calculi will be considered ciuria, stone growth and new stone formation can further. be improved by measures that reduce urinary calcium excretion such as dietary restriction, Primary hyperoxaluria thiazide diuretics or cellulose phosphate. It is common to find hypocitraturia in patients Two types have been described and both are very with calcium oxalate calculi, although this requires rare:'5 there are perhaps 150 reports ofType I cases copyright. a specialist laboratory; urine citrate varies with pH and 18 reports of Type II. Type I (PH1) is an and the normal ranges for men and women are very autosomal recessive disease associated with different. Citrate is the most important inhibitor of dramatic hyperoxaluria (up to 8 mmol per day) calcium oxalate crystal formation in normal urine and hyperglycollic aciduria. Patients present in because it forms soluble complexes with free cal- infancy or childhood with recurrent calcium cium oxalate crystal formation in normal urine oxalate nephrolithiasis causing obstruction, infec- because it forms soluble complexes with free cal- tion and progressive renal impairment. Oxalate cium ions."' Low urine citrate levels are associated, retention accelerates as renal function declines and http://pmj.bmj.com/ for example, with a high animal protein intake, leads to the development of systemic oxalosis; thiazide-induced hypokalaemia and volume deple- oxalate deposition in various tissues can lead to tion and can be increased by oral alkali supp- heart block, peripheral gangrene and crippling lements. Oral potassium citrate is widely used in the bone disease. The disease is due to a deficiency of USA, and has been shown to reduce the likelihood the hepatic peroxisomal enzyme alanine glyoxylate of stone growth and recurrence. aminotransferase (AGT), which is responsible for Alkali administration, as well as increasing the conversion ofglyoxylate, the immediate precur- urinary citrate, will also correct the very acid urine sor of oxalate, to glycine. AGT is pyridoxine on September 25, 2021 by guest. Protected (pH less than 5.5) found in about 25% of stone dependent and about 30% of patients respond to formers. An acid urine will tend to promote uric large doses of vitamin B6 (400-800 mg per day) acid crystallization that can act as a nidus for with a useful reduction in the intensity of their calcium oxalate crystals (epitaxy) and also bind hyperoxaluria. The enzyme may be absent, macromolecular inhibitors.6 Low urine pH may be catalytically inactive or wrongly localized to the associated with relative oliguria or chronic diarr- hepatic mitochondria; in all cases hyperoxaluria hoea, and will aggravate the risks ofcrystallization results from the increased levels ofglyoxylate. Once associated with the hyperuricosuria that is present these patients have developed end-stage renal in about 20% of patients with calcium oxalate failure, life expectancy on regular dialysis is stones. limited, because of the progression of systemic oxalosis. Similarly, the lifespan ofrenal transplants Causes of hyperoxaluria is limited because of the continuing hyperoxaluria and the risks of renal oxalosis and calculus forma- A complete list of the possible causes of hyperox- tion. The definitive treatment is a combined syn- aluria is given in Table I, although only those chronous hepato-renal transplant, with removal of Postgrad Med J: first published as 10.1136/pgmj.70.828.695 on 1 October 1994. Downloaded from HYPEROXALURIA AND RENAL CALCULI 697 the native liver;'6 this corrects the enzyme urine and low levels ofurinary inhibitors. Manage- deficiency and restores renal function. ment ofenteric hyperoxaluria may be very difficult PH2 is very rare indeed and is due to deficiency of and involves increasing the luminal calcium con- D-glycerate dehydrogenase.'7'8 The disease prob- centration with supplements ofcalcium carbonate, ably results because this is the same enzyme as dietary restriction of fat and oxalate together with glyoxylate reductase and its deficiency would be treatment, if possible, of the underlying cause.2' expected to increase glyoxylate levels. The enzyme is probably widely distributed, unlike AGT, and the disease seems to be milder than PH 1, with only Conclusion two cases ofend-stage renal failure described.
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