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Serum free carnitine, carnitine esters and lipids in patients on peritoneal dialysis and hemodialysis.
Serum free and esterified carnitine levels as well as lipids were investigated in patients undergoing regular hemodialysis (HD) treatment before and during 12 weeks of treatment with L-carnitine (1 g i.v.) at the end of each HD. The results were compared with those obtained in patients on continuous ambulatory peritoneal dialysis (CAPD; n = 15) or intermittent peritoneal dialysis (IPD; n = 3) and healthy controls (CO; n = 20). In HD patients (n = 23) total carnitine (TC) was 49.9 +/- 3.9 (CO: 46.0 +/- 2.5; NS), free carnitine (FC) was 31.6 +/- 2.8 (CO: 37.4 +/- 1.3; p less than 0.05), short-chain acylcarnitine (SCC) was 17.0 +/- 1.8 (CO: 7.2 +/- 0.9; p less than 0.0001) and long-chain acylcarnitine (LCC) was 1.2 +/- 0.2 mumol/l (CO: 0.6 +/- 0.1; p less than 0.05). FC was in the normal range in CAPD (35.6 +/- 3.2) and IPD (44.5 +/- 8.0 mumol/l) patients, whereas SCC (30.1 +/- 3.5) and LCC (2.9 +/- 0.2) levels were maximal elevated in IPD patients (11.8 +/- 0.8 and 1.5 +/- 0.2 on CAPD). Therefore, TC was higher in IPD than in CAPD patients (77.5 +/- 5.0 vs. 49.0 +/- 3.5 mumol/l). 12 weeks after L-carnitine supplementation in HD patients, TC was 313.9 +/- 22.6, FC was 207.7 +/- 12.4, SCC was 99.6 +/- 12.1 and LCC was 7.1 +/- 0.6 mumol/l. TC and FC were significantly lower in females compared with males. Total cholesterol and ketone bodies were normal, HDL cholesterol was significantly decreased before and after L-carnitine supplementation.(ABSTRACT TRUNCATED AT 250 WORDS)
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