[Persistent hyperinsulinemic hypoglycemia in the newborn and infants]

Area of Science:

• Pediatric Endocrinology
• Medical Genetics

Background:

• Persistent hyperinsulinemic hypoglycemia of infancy (PHHI) is the leading cause of hypoglycemia in infants.
• Clinical and histopathological presentations of PHHI are diverse, including focal and diffuse pancreatic lesions.
• Accurate diagnosis is critical due to differing therapeutic and genetic implications.

Purpose of the Study:

• To highlight the importance of differentiating between focal and diffuse forms of PHHI.
• To underscore the distinct management strategies and outcomes associated with each form.
• To review the genetic underpinnings of various PHHI subtypes.

Main Methods:

• Review of clinical presentations, histopathological findings, and treatment responses in PHHI cases.
• Analysis of genetic mutations associated with recessively and dominantly inherited PHHI.
• Comparison of surgical outcomes for focal versus diffuse pancreatic lesions.

Main Results:

• Focal PHHI lesions, characterized by localized islet cell hyperplasia, are curable with limited pancreatic resection.
• Diffuse PHHI lesions, involving the entire pancreas, necessitate subtotal pancreatectomy, increasing the risk of diabetes mellitus.
• Genetic causes include mutations in SUR1 and Kir6.2 genes for recessive forms, and glucokinase or glutamate dehydrogenase genes for dominant forms.

Conclusions:

• Distinguishing focal and diffuse PHHI is essential for guiding surgical intervention and genetic counseling.
• Focal PHHI offers a favorable prognosis with targeted resection, while diffuse PHHI presents significant long-term challenges.
• Understanding the genetic basis of PHHI is key to personalized treatment and family planning.