Emergency Protocols and Metabolic Crises

While daily biotin treatment is highly effective at managing Holocarboxylase Synthetase (HLCS) deficiency, your child remains at risk for a metabolic crisis during times of physical stress ^[1][2]. A crisis occurs when the body’s metabolic pathways are overwhelmed, leading to a dangerous buildup of toxic acids in the blood ^[3][4].

Triggers for a Metabolic Crisis

A crisis is typically triggered by catabolic stress—any situation where the body begins breaking down its own protein and fat stores for energy rather than using food ^[2]. Common triggers include:

• Illness: Fever, viral infections, or stomach bugs ^[5][2].
• Reduced Intake: Refusing to eat, poor feeding, or vomiting ^[5].
• Fasting: Going too long without food, which can happen during an illness or before a medical or dental procedure ^[5].

Emergency Red Flags: When to Seek Immediate Care

A metabolic crisis is a medical emergency. You must seek immediate care at the nearest emergency room if your child shows any of the following symptoms during an illness:

• Extreme Lethargy: Your child is unusually sleepy, difficult to wake up, or seems “spaced out” (encephalopathy) ^[1][4].
• Persistent Vomiting: Inability to keep down fluids or their life-saving biotin ^[1].
• Rapid or Heavy Breathing: Fast, deep breathing (tachypnea) is a sign that the body is trying to compensate for too much acid in the blood ^[4][6].
• Neurological Changes: Sudden muscle weakness (hypotonia), seizures, or tremors ^[1][4].

SAFETY INSTRUCTION: Do NOT force fluids or attempt to give oral medication if your child is unusually drowsy, seizing, or persistently vomiting. Doing so is unsafe and delays life-saving care.

Your Action Plan

• CALL NOW: Contact your metabolic team immediately.
• GO NOW: Proceed directly to the nearest emergency department. Do not delay transport while trying to administer home treatment.
• BRING: Your child’s Metabolic Emergency Letter and your current supply of biotin.
• DO NOT: Allow the emergency department to adjust treatment based purely on standard protocols. Ensure they contact your metabolic specialist immediately.

What Happens in the Emergency Room?

When you arrive at the ER, immediately present your Metabolic Emergency Letter. This letter, provided by your specialist, explains HLCS deficiency and tells the ER staff exactly how to treat your child ^[5]. Standard emergency treatment typically involves:

1. Preventing Catabolism: The ER will start IV fluids containing dextrose (sugar) at the specific rate and concentration outlined in your child’s metabolic emergency protocol. This stops the body from breaking down its own tissues ^[7].
2. Specialized Biotin Dosing: If your child cannot take biotin orally, the specialist must direct the dose and administration route. Never increase or repeat improvised doses of biotin on your own.
3. Correcting Acidosis: Fluids and sometimes other medications are used to bring the blood pH back to a safe level ^[8][9].
4. Careful Monitoring: Because blood sugar can sometimes become unstable during treatment, emergency doctors must monitor glucose and electrolytes closely, guided by the metabolic team and potentially critical-care physicians if complications arise ^[7].

Note: Routine symptoms that your child always has, such as stable skin rashes or chronic hair thinning, are not emergencies. However, any sudden change in alertness, breathing, or ability to eat during an illness must be treated as a crisis until proven otherwise ^[1][4].