Familial hypertriglyceridemia
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Familial hypertriglyceridemia (type IV familial dyslipidemia) is a genetic disorder characterized by the liver overproducing very-low-density lipoproteins (VLDL). As a result, an affected individual will have an excessive number of VLDL and triglycerides on a lipid profile. This genetic disorder usually follows an autosomal dominant inheritance pattern. The disorder presents clinically in patients with mild to moderate elevations in triglyceride levels. Familial hypertriglyceridemia is typically associated with other co-morbid conditions such as hypertension, obesity, and hyperglycemia. Individuals with the disorder are mostly heterozygous in an inactivating mutation of the gene encoding for lipoprotein lipase (LPL). This sole mutation can markedly elevate serum triglyceride levels. However, when combined with other medications or pathologies it can further elevate serum triglyceride levels to pathologic levels.[1] Substantial increases in serum triglyceride levels can lead to certain clinical signs and the development of acute pancreatitis.
Familial hypertriglyceridemia | |
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Familial hypertriglyceridemia is inherited in autosomal dominant manner |
Familial hypertriglyceridemia falls in the Fredrickson-Levy and Lee's (FLL) phenotypes. The phenotypes include types I, IIa, IIb, III, IV, and V dyslipidemias. Familial hypertriglyceridemia is considered a type IV familial dyslipidemia it is distinguished from other dyslipidemias based on the individual's lipid profile. Familial hypertriglyceridemia separates itself from other dyslipidemias with significantly high triglycerides and low HDL levels. It is important to recognize that co-morbid conditions that often concomitantly exist with the disorder can further alter the lipid panel.[2]