Abstract
1. The in vitro hepatic metabolism of lignocaine to monoethylglycinexylide (MEGX) is mediated by CYP3A4 and that of coumarin to 7-hydroxycoumarin (7OHC) by CYP2A6. We investigated the usefulness of monitoring serum MEGX concentrations (after 1 mg kg-1 lignocaine i.v.) and urinary 7OHC excretion (after 5 mg coumarin p.o.) to reflect liver function in patients with liver (n = 36), kidney (n = 12) and epileptic (n = 12) disease and in control subjects (n = 20). The extent of liver disease was assessed using measurements of serum aminoterminal propeptide (PIIINP) and Child-Pugh grades. 2. Serum concentrations of MEGX were decreased in severe (4.6 +/- 3.0 s.d. ng ml-1), moderate (19.1 +/- 11.6 s.d. ng ml-1) and mild (32.8 +/- 14.2 s.d ng ml-1) liver disease as compared with controls (53.4 +/- 15.8 s.d ng ml-1). The excretion of 7OHC over 2 h was decreased in severe (18.0 +/- 10.3 s.d % of dose) and moderate (34.2 +/- 15.6 s.d %), but not in mild (49.7 +/- 19.0 s.d %) liver disease as compared with that in controls (56.2 +/- 11.6%). 3. In epileptic patients the urinary recovery of 7OHC was increased (2 h value 69.5 +/- 13.2 s.d %) suggesting enzyme induction. In contrast, serum MEGX concentration were low (40.0 +/- 14.1 s.d ng ml-1), possibly due to competition for CYP3A4 between lignocaine and antiepileptic drugs. 4. In patients with kidney disease serum MEGX concentration (56.5 +/- 26.1 s.d ng ml-1) was similar to that in controls.(ABSTRACT TRUNCATED AT 250 WORDS)
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Selected References
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