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Familial lipoprotein lipase deficiency in infancy: clinical, biochemical, and molecular study
J C Feoli-Fonseca1, E Lévy, M Godard
1Department of Pediatrics, St-Justine Hospital, University of Montreal, Quebec, Canada.
Insights
Lipoprotein lipase (LPL) deficiency in infants presents diversely, but severe fat restriction effectively manages chylomicronemia. Careful monitoring is crucial to prevent nutritional deficiencies, and estrogen therapy should be avoided.
Area of Science:
- Biochemistry
- Pediatrics
- Genetics
Background:
- Lipoprotein lipase (LPL) deficiency is a rare genetic disorder characterized by severe hypertriglyceridemia.
- Infantile presentation of LPL deficiency can be heterogeneous, posing diagnostic challenges.
Purpose of the Study:
- To characterize infants diagnosed with LPL deficiency.
- To assess the safety and efficacy of a severely fat-restricted diet in managing chylomicronemia in infants.
Main Methods:
- Retrospective review of clinical courses of children under one year old presenting with chylomicronemia between 1972 and 1995.
- Diagnosis confirmed by demonstrating LPL deficiency.
Main Results:
- Sixteen infants with LPL deficiency presented with varied symptoms including irritability, intestinal bleeding, pallor, anemia, and splenomegaly.
- Dietary fat restriction rapidly resolved chylomicronemia, enabling sustained metabolic control.
- No persistent growth issues were observed; however, abnormal serum iron, alkaline phosphatase, and calcium levels were noted.
Conclusions:
- Infantile LPL deficiency exhibits a heterogeneous clinical presentation.
- Strict dietary fat monitoring is essential to prevent nutritional deficits.
- Estrogen-containing therapies are contraindicated in LPL-deficient individuals.
Objectives:
To describe the characteristics of lipoprotein lipase (LPL)-deficient patients seen in infancy and to evaluate the safety and efficacy of severe fat restriction.
Methods:
Children <1 year old presenting with chylomicronemia between 1972 and 1995 were identified, and their clinical courses were reviewed retrospectively.
Results:
LPL deficiency was demonstrated in 16 infants who presented with irritability (n = 7), lower intestinal bleeding (n = 2), pallor, anemia, or splenomegaly (n = 5), and a family history or fortuitous discovery (n = 2). All plasma samples were lactescent at presentation. Chylomicronemia responded rapidly to dietary fat restriction, and it was possible to maintain satisfactory metabolic control for a prolonged period of time. Only 1 adolescent girl had an episode of pancreatitis associated with the use of oral contraceptives. No persistent adverse effects on growth were seen. We obtained abnormal values for serum iron, alkaline phosphatase, and total calcium.
Conclusions:
The presentation of LPL deficiency is heterogeneous during infancy. Close dietary monitoring is required to avoid nutritional deficiencies. Estrogen therapy should be avoided in LPL-deficient patients.