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Biomedical subjects

T Gunasekaran

Publications and source records attributed to T Gunasekaran.

3 recordsLinked to original sources

Halothane hepatitis in children.

Halothane hepatitis is now a well-recognized distinct entity in adults, but there prevails an often-taught "axiom" that halothane hepatitis "does not occur" in children. We describe 2 children who developed cholestatic hepatitis following halothane anesthesia. The first patient had no antecedent liver disease, and presented with anorexia, abdominal pain and delayed onset of jaundice after multiple halothane exposures. Halothane-specific antibodies were positive, and liver tests resolved completely. The second patient had antecedent liver disease and presented with delayed onset of unexplained high fevers for 10 days following a single halothane exposure. Gradually increasing cholestasis ensued in the absence of other causes of liver disease. Halothane antibodies were negative. These cases illustrate different clinical presentations of halothane hepatitis, such as delayed onset of jaundice or fever following halothane exposure. The difficulties in making a definitive diagnosis and the need to exclude other causes of liver disease are detailed. Risk factors and other presentations are discussed. While halothane hepatitis appears to be an uncommon entity in children, it does occur, and may present with manifestations less than fulminant hepatic failure. A high index of suspicion and a detailed history of the time sequence of events are necessary as the diagnosis is primarily clinical. Halothane-specific antibodies are helpful if positive. In any child developing unexplained jaundice or high fevers following halothane anesthesia, further exposures should be avoided and halothane-specific antibodies obtained.

Chemical and Drug Induced Liver Injury↗

Treatment of chronic liver disease caused by 3 beta-hydroxy-delta 5-C27-steroid dehydrogenase deficiency with chenodeoxycholic acid.

Deficiency of 3 beta-hydroxy-delta 5-C27-steroid dehydrogenase, the second enzyme in the sequence that catalyses the synthesis of bile acids from cholesterol, leads to chronic liver disease in childhood as well as to malabsorption of fat and fat soluble vitamins. A 4 year old boy with this condition has been successfully treated by oral administration of a bile acid--chenodeoxycholic acid. He had been jaundiced since birth, grew poorly because of rickets, and had severe pruritus. Plasma transaminase activities were persistently raised. Chenodeoxycholic acid 125 mg twice daily for two months, and then 125 mg daily, cured his jaundice and pruritus, returned his transaminase activities to normal, and eliminated the need for calcitriol for prevention of rickets. On this treatment he has so far remained well for two years. A diagnosis of 3 beta-hydroxy-delta 5-C27-steroid dehydrogenase deficiency should be considered in any child with unexplained chronic hepatitis or cirrhosis, especially if the liver disease is accompanied by a clinically obvious malabsorption of fat soluble vitamins. A simple colorimetric test of the urine confirms the diagnosis and effective treatment can be started.

3-Hydroxysteroid Dehydrogenases↗

Lack of 3 beta-hydroxy-delta 5-C27-steroid dehydrogenase/isomerase in fibroblasts from a child with urinary excretion of 3 beta-hydroxy-delta 5-bile acids. A new inborn error of metabolism.

Cultured fibroblasts were shown to be capable of catalyzing the conversion of 7 alpha-hydroxy-cholesterol to 7 alpha-hydroxy-4-cholesten-3-one, an important reaction in bile acid synthesis. The apparent Km was approximately 7 mumol/liter and Vmax varied between 3 and 9 nmol/mg protein per h under the assay conditions used. The assay was used to investigate fibroblasts from a patient who presented with a familial giant cell hepatitis and who was found to excrete the monosulfates of 3 beta, 7 alpha-dihydroxy-5-cholenoic acid and 3 beta, 7 alpha, 12 alpha-trihydroxy-5-cholenoic acid in urine (Clayton, P. T., J. V. Leonard, A. M. Lawson, K. D. R. Setchell, S. Andersson, B. Egestad, and J. Sjövall. 1987. J. Clin. Invest. 79:1031-1038). In addition 7 alpha-hydroxy-cholesterol was found to accumulate in the circulation. Cultured fibroblasts from this boy were completely devoid of 3 beta-hydroxy-delta 5-C27-steroid dehydrogenase/isomerase activity. Fibroblasts from his parents had reduced activity, compatible with a heterozygous genotype. The results provide strong evidence for the suggestion that this patient's liver disease was caused by a primary defect in the 3 beta-hydroxy-delta 5-C27-steroid dehydrogenase/isomerase involved in bile acid biosynthesis.

3-Hydroxysteroid Dehydrogenases↗