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Hyperthyroidism and hepatic dysfunction. A case series analysis
T L Fong1, J G McHutchison, T B Reynolds
1University of Southern California School of Medicine, Los Angeles.
Insights
Hyperthyroidism can cause significant liver test abnormalities, including jaundice and prolonged prothrombin time, complicating diagnosis of other liver diseases. Promptly controlling hyperthyroidism is crucial for accurate liver assessment.
Area of Science:
- Endocrinology
- Hepatology
- Internal Medicine
Background:
- Liver dysfunction is not well-characterized in hyperthyroid patients.
- Hyperthyroidism can present with various clinical and biochemical abnormalities.
Purpose of the Study:
- To define the spectrum of clinical and liver test abnormalities in hyperthyroid patients.
- To investigate the impact of hyperthyroidism on liver function tests and its diagnostic implications.
Main Methods:
- Retrospective analysis of clinical records from 43 hyperthyroid patients.
- Categorization of patients into uncomplicated hyperthyroidism (HT), hyperthyroidism with congestive heart failure (HT/CHF), and hyperthyroidism with unrelated liver disease (HT/ULD).
- Evaluation of clinical findings (hepatomegaly, splenomegaly, ascites) and liver function tests (aminotransferases, bilirubin, prothrombin time).
Main Results:
- Hepatomegaly/splenomegaly was more frequent in HT/CHF (79%) than HT (33%) or HT/ULD (50%).
- Severe liver test abnormalities (jaundice, prolonged prothrombin time) were observed in patients with hyperthyroidism alone or with HT/CHF.
- No characteristic liver histology directly attributed to hyperthyroidism was identified.
Conclusions:
- Severe liver test abnormalities can occur in hyperthyroidism, mimicking unrelated liver disease.
- Distinguishing concomitant liver disease in hyperthyroid patients is challenging until thyroid status is normalized.
- Management of hyperthyroidism is essential for accurate diagnosis and treatment of liver conditions.
Abstract:
Liver dysfunction in hyperthyroid patients has not been well characterized. We analyzed the clinical records of 43 patients with hyperthyroidism to define the spectrum of clinical and liver test abnormalities. The patients were divided into three categories: (a) 18 patients with uncomplicated hyperthyroidism (HT) (b) 19 with hyperthyroidism and congestive heart failure (HT/CHF), and (c) 6 with hyperthyroidism and concomitant unrelated liver disease (HT/ULD). Hepatomegaly and/or spenomegaly were noted in 15 of 19 (79%) patients with HT/CHF as compared to 6 of 18 (33%) patients with HT and 3 of 6 (50%) patients with HT/ULD. Four patients with HT/CHF had ascites. Serum aminotransferase levels greater than 250 IU/L were noted in only 1 of 37 (3%) patients without unrelated liver disease. Patients with HT/ULD or HT/CHF had markedly low prothrombin time. Serum bilirubin levels as high as 323 microM were noted in patients with HT. No characteristic liver histology due to hyperthyroidism was noted. Severe liver test abnormalities, including deep jaundice and prolonged prothrombin time, can occur in patients with hyperthyroidism alone or with HT/CHF. This makes the diagnosis of concomitant, unrelated liver disease difficult until the hyperthyroidism has been controlled.
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