Standard of Care: Managing and Treating CHI

Managing Congenital Hyperinsulinism (CHI) requires a step-by-step approach that moves from immediate stabilization to long-term control. The goal is always the same: maintain safe blood sugar levels to protect the brain while minimizing side effects ^[1][2].

Step 1: Immediate Stabilization

When a baby is first diagnosed, the priority is to stop the dangerous “lows.”

• High-Concentration Dextrose: Babies often need a very high amount of intravenous (IV) sugar to keep up with the excess insulin ^[3][4].
• Glucagon: This hormone works as an “anti-insulin,” telling the liver to release stored sugar. It can be given as a continuous IV infusion in the hospital. Additionally, glucagon can also be prescribed as an emergency at-home intramuscular or subcutaneous rescue injection for sudden severe lows ^[1][4].

The Role of Feeding and Nutrition

Because CHI involves constant insulin, frequent and consistent carbohydrates are often required to prevent lows. Many children require continuous overnight feeding or strict daytime feeding schedules. To ease the burden of round-the-clock feeds, the care team may recommend a Nasogastric (NG) tube (a tube through the nose to the stomach) or a Gastrostomy (G) tube (a tube placed directly into the stomach). While the idea of a feeding tube can be daunting, many parents find it becomes a vital tool that helps ensure their child gets the necessary sugar without the constant stress of forced oral feeding ^[5][3].

Step 2: First-Line Medical Therapy (Diazoxide)

Diazoxide is the first medication most children try. It works by acting on the KATP channels (the “gates”) in the pancreas, helping them stay open to stop insulin release ^[6][7].

• Common Side Effects: Most children will experience hypertrichosis (excessive hair growth on the forehead, back, or limbs) and some fluid retention (swelling) ^[8][9].
• Serious Risk: A rare but severe side effect is pulmonary hypertension (high blood pressure in the lungs), which affects about 2% of children on the drug. Doctors should monitor your child’s heart and breathing closely when starting this medication ^[10][8].

Step 3: Second-Line Medical Therapy (Octreotide & Sirolimus)

If diazoxide does not work (often called “diazoxide-resistant” CHI), other medications are used:

• Octreotide: This is an injection that signals the pancreas to suppress insulin ^[11]. Side effects can include gallbladder stones and, in rare cases, a serious intestinal issue called necrotizing enterocolitis (NEC) in newborns ^[12][13].
• Sirolimus: For children who do not respond to other drugs, this “mTOR inhibitor” is sometimes used to avoid surgery. It requires careful monitoring because it can suppress the immune system ^[3][14].

Step 4: Surgical Options

The type of surgery depends entirely on whether the CHI is Focal or Diffuse ^[15].

• Focal CHI (Targeted Lesionectomy): A surgeon removes just the localized cluster of cells. This is curative in up to 97% of cases, and because the rest of the pancreas is left intact, these children typically do not develop diabetes or digestive issues ^[15][16].
• Diffuse CHI (Subtotal Pancreatectomy): If the entire pancreas is affected and medications aren’t working, removing 95-98% of the pancreas may be necessary. This is not a cure, but a way to make the hypoglycemia manageable. Most children who undergo this surgery will eventually develop insulin-dependent diabetes and exocrine insufficiency (the inability to digest food properly without taking replacement enzymes) ^[17][18].

The Treatment Decision Tree

A high-quality care team will follow a standard chronological order to protect your child:

1. Start Diazoxide: Initiated almost immediately upon diagnosis to attempt medical control while waiting weeks for rapid genetic results ^[15].
2. Evaluate Genetics & Meds: If Diazoxide fails OR genetics point to a paternal focal mutation \u2192 Proceed to 18F-DOPA PET/CT Scan ^[15].
3. If Focal: Proceed to Targeted Lesionectomy (Cure) ^[15].
4. If Diffuse: Try second-line medications (Octreotide, Sirolimus). If all fail \u2192 Consider Subtotal Pancreatectomy to prevent brain injury ^[3].

Warning: Attempting a “blind” surgery (removing parts of the pancreas without a PET scan or genetic guidance) is outdated and significantly increases the risk of complications. Always ensure your child is at a specialized center ^[15][19].