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Published on: March 6, 2019
Incidental diagnosis of LPL deficiency in an infant presenting with an acute respiratory infection
Mohamed Thowfeek Zeenath Thaneefa1, Givani Amarakoon2, Devan Mendis3
1Department of Chemical Pathology, Lady Ridgeway Hospital for Children, Sri Lanka.
Insights
Lipoprotein lipase (LPL) deficiency, a rare metabolic disorder, was incidentally diagnosed in an infant with a respiratory infection. Treatment with a low-fat diet and medium-chain triglyceride formula normalized triglyceride levels.
Area of Science:
- Biochemistry
- Genetics
- Pediatrics
Background:
- Lipoprotein lipase (LPL) deficiency is a rare inherited disorder of lipid metabolism.
- It typically presents in childhood with severe hypertriglyceridaemia.
- Early diagnosis and management are crucial to prevent complications.
Purpose of the Study:
- To report the incidental diagnosis and successful management of LPL deficiency in an infant.
- To highlight the importance of considering metabolic disorders in pediatric patients with non-specific symptoms.
Main Methods:
- Case report of an infant presenting with acute respiratory tract infection.
- Biochemical analysis revealing milky serum and hypertriglyceridaemia (>1000 mg/dL).
- Genetic testing identifying compound heterozygous LPL variants (c.808C>G p.(Arg270Gly) and c.1019-3C>G).
Main Results:
- The infant presented with symptoms of a lower respiratory tract infection.
- Incidental findings included milky serum and markedly elevated triglycerides.
- Genetic analysis confirmed compound heterozygous LPL deficiency.
- Treatment with a low-fat diet and medium-chain triglyceride formula led to normalized triglyceride levels.
Conclusions:
- LPL deficiency can be incidentally diagnosed in infants presenting with common infections.
- A combination of dietary modification and specialized formula can effectively manage LPL deficiency.
- This case underscores the need for comprehensive metabolic evaluation in pediatric hypertriglyceridaemia.
Abstract:
Lipoprotein lipase (LPL) deficiency is an extremely rare disorder of lipid metabolism known to cause hypertriglyceridaemia in childhood. We report the incidental diagnosis of LPL deficiency in an infant presenting with an acute respiratory tract infection. The patient was initially treated for a lower respiratory tract infection, but was subsequently found to have milky appearance of the serum, with a triglyceride concentration greater than 1000 mg/dL. Clinical examination revealed hepatosplenomegaly. Genetic analysis showed that the patient was a compound heterozygote for two rare likely pathogenic LPL variants c.808C>G p.(Arg270Gly) and c.1019-3C>G. She was commenced on a low-fat diet with the addition of medium chain triglyceride formula. At follow-up, her serum triglyceride level was normal.
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