Twenty-seven patients with primary hypothyroidism were studied to evaluate the relationship between hepatic function and thyroid hormone deficiency in this disorder. In hypothyroidism, hypergammaglobulinemia was found in 71 %, elevated glutamic oxaloacetic transaminase (GOT) in 48 %, high lactic dehydrogenase (LDH) in 58 %, hypercholesteremia in 52 % and low elimination rate constant of indocyanin green (K
ICG) in 44 %. In each criterion of liver function, these patients were divided into two groups, normal level and abnormal level group, respectively. T3 and T4 in patients with abnormal levels of GOT, glutamic pyruvic transaminase (GPT), γ-glutamyl transpeptidase (γ-GTP), leucine aminopeptidase (LAP), alkaline phosphatase (ALP) and 45 minutes retention rate of bromsulphalein (BSP) were not different from those in the normal level group. However, T3 and T4 in patients with abnormal levels of LDH, cholesterol, cholinesterase (ChE) and K
ICG were lower than those in the normal level group. The abnormal K
ICG group had a statistically higher cardio-thoracic ratio (CTR) than the normal group (65.7 ± 18.8 % vs 50.4 ± 8.3 %, p<0.05). In patients with pericardial effusion, CTR was 65.9 ± 14.6 %, while that in patients without pericardial effusion was 49.9 ±7.5 %(p<0.05). These abnormalities of liver function were normalized in all cases after hormone replacement therapy. Liver biopsy in three cases disclosed normal liver in two cases and mild infiltration of monocyte into Glisson's capsule in one case.
These results suggested that liver damage in primary hypothyroidism was mild and reversible, and that when the degree of hypothyroidism was slight and mild, liver function was not obviously affected and that the degree of hypothyroidism was partially predicted by liver function tests such as LDH, cholesterol, ChE and K
ICG.
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