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.

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