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- W2437084489 abstract "The difficulty of clinical and biochemical diagnosis of insulinoma lies in the extreme variability of both clinical symptoms and glycaemia/insulinaemia levels, so that neither parameter is a totally reliable diagnostic indicator. The possibility of introducing a third parameter, the non-esterified fatty acid (FFA) level, to enhance the reliability of insulinoma diagnosis was therefore investigated. The behaviour of glucose, insulin and plasmatic FFA levels and the correlation of the three parameters were studied in 4 patients whose suspected insulinomas were later surgically confirmed. The tests applied were as follows: 24 hour fast followed by endovenous glucose, oral glucose administration, tolbutamide stimulus test, adrenaline and glucagon tests. The results revealed anomalies in insulinaemia and glycaemia behaviour such as have already, in part, been described in organic hyperinsulinism, e.g. the discrepancy between insulin and glucose levels after prolonged fasting. It was also clear that the parameters examined still leave much room for uncertainly in the biochemical diagnosis of insulinomas. Numerous anomalies were also observed in the behaviour of plasmatic FFA. For example lipid mobilisation was often reduced in conditions that normally stimulate it (fasting, the administration of catecholamines). Equally the prolonged blockage of lipid mobilisation was encountered in the presence of factors that normally reduce lipolysis (endovenous glucose). On the basis of these results it is suggested that a combined assessment of glucose and plasmatic FFA levels may be a more sensitive diagnostic indicator of insulinoma than the insulin/glucose ratio commonly reported in the literature. The mechanism behind the lipid mobilisation anomalies of insulinomas is also discussed in the light of its apparent connection with the glucose/insulin interaction characteristic of the condition." @default.
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- W2437084489 date "1985-09-29" @default.
- W2437084489 modified "2023-09-23" @default.
- W2437084489 title "[Biochemical diagnosis of insulinoma: correlations between blood glucose, blood insulin and the titer of plasma non-esterified fatty acids during fasting and during various diagnostic tests]." @default.
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