Emergency Management: Navigating a Metabolic Crisis

A metabolic crisis, also called catabolic decompensation, is a medical emergency where the body begins to break down its own tissues for energy because it cannot properly process fats and proteins ^[1]. This breakdown releases metabolic byproducts that can rapidly overwhelm the heart, brain, and kidneys ^[2][3].

Because MADD is so rare, emergency room staff may not realize how quickly a person can decline. You must be prepared to act as your own advocate by recognizing red flags and presenting a specialist-written emergency letter immediately upon arrival ^[4].

Recognizing an Emergency

Crises are almost always triggered by catabolic stress—situations where the body’s energy demands skyrocket or its fuel supply is cut off ^[1]. Common triggers include:

• Infections (even common ones like the flu or a cold) ^[5].
• Vomiting or diarrhea that prevents you from keeping down food ^[6].
• Prolonged fasting (missing meals) ^[1].
• Extreme physical exertion or surgery ^[7].

Red Flags: When to Seek Help

If you observe any of the following symptoms, call emergency services or go to the nearest ER immediately, calling your metabolic specialist while you are on the way. Do not wait to see if the symptoms pass.

Tier 1: Immediate Emergency (Go to ER / Call 911)

• Lethargy or Altered Mental State: Being unusually difficult to wake up, or showing sudden confusion, irritability, or delirium ^[8][9].
• Muscle Pain and Dark Urine: Severe muscle aches accompanied by “tea-colored” or “cola-colored” urine can indicate rhabdomyolysis (muscle breakdown), which can cause acute kidney injury and dangerous potassium levels ^[10][11].
• Severe Vomiting: Being unable to keep any fluids or carbohydrates down, hitting the specific threshold set by your metabolic team ^[4].
• Seizures: Any involuntary shaking or loss of consciousness ^[8].
• Breathing Issues: Rapid, deep, or labored breathing ^[10].
• Extreme Weakness: A sudden inability to walk, stand, or hold one’s head up ^[12][8].

Note: Normal glucose or ketone results on a home meter do not exclude a metabolic crisis. If symptoms match the red flags above, seek immediate help regardless of your home readings.

What is Happening Inside the Body?

During a crisis, doctors will look for several specific markers in blood and urine tests:

• Hypoketotic Hypoglycemia: Low blood sugar (hypoglycemia) with an unusually low level of ketones ^[3][4]. However, note that late-onset MADD can present with severe issues even when glucose is normal.
• Metabolic Acidosis: Too much acid in the blood (high anion gap), often including high levels of lactate ^[10][9].
• Hyperammonemia: Elevated levels of ammonia, which is toxic to the brain ^[8].
• Elevated CK (Creatine Kinase): A marker of muscle damage that indicates rhabdomyolysis ^[10].

Emergency Treatment at the Hospital

The goal of emergency treatment is to stop the body from breaking itself down (reverse catabolism) ^[4].

1. High-Dose IV Glucose

The most critical treatment is a rapid infusion of intravenous (IV) glucose (dextrose) ^[10]. This provides the body with an immediate fuel source so it can stop burning its own tissues ^[4][10].

2. Following the Metabolic Protocol

• Lipid Management: Your ER team must follow your specific protocol regarding lipids. In many acute phases, IV lipid emulsions are avoided, but this must be guided by your specialist, not treated as a blanket ban on all fats forever ^[10][1].
• Supplements: The ER must contact your metabolic specialist to decide if and how to give supplements like carnitine or riboflavin. This should never delay the immediate administration of IV dextrose ^[4][10].
• Critical Care: In severe cases involving high ammonia or life-threatening acidity, the patient may need the Intensive Care Unit (ICU) for treatments like dialysis ^[4][8].

Your “Sick Day Protocol” Letter

Every person with MADD must have a Sick Day Protocol letter written by their metabolic specialist. This letter is your most important tool in an emergency. It should clearly state:

1. The diagnosis (MADD / Glutaric Acidemia Type II).
2. The need for immediate IV glucose (specifying the exact concentration and rate based on weight and age).
3. The specific instructions on lipid restrictions and lab tests.
4. The contact information for the metabolic specialist on call.

Always keep a copy of this letter in your car, your bag, and on your phone. When you arrive at the ER, hand it to the triage nurse immediately and say: “My child/I have a rare metabolic disorder. We are in a metabolic crisis. This letter contains the emergency treatment protocol.” ^[4]