An infant presents with history of seizures & skin rashes. Investigations show metabolic acidosis increased blood ketone levels and normal NH3. This child is likely to be suffering from –
**Core Concept**
The question is testing the understanding of the pathophysiology of inborn errors of metabolism, specifically the diagnosis of non-ketotic hyperglycinemia (NKH) or ketotic hyperglycinemia in the context of seizures and skin rashes.
**Why the Correct Answer is Right**
The presentation of seizures, skin rashes, metabolic acidosis, and increased blood ketone levels in an infant suggests a disorder of amino acid metabolism. The absence of elevated ammonia levels (normal NH3) points towards a disorder that does not involve the urea cycle. Non-ketotic hyperglycinemia (NKH) is a disorder of the glycine cleavage system, which is responsible for the breakdown of glycine. In NKH, glycine accumulates and leads to metabolic acidosis, seizures, and other neurological symptoms. The presence of normal ammonia levels and increased ketone levels helps to rule out other disorders such as maple syrup urine disease.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is not provided, so we cannot evaluate it.
**Option B:** This option is also not provided, so we cannot evaluate it.
**Option C:** This option is not provided, so we cannot evaluate it.
**Option D:** This option is also not provided, so we cannot evaluate it.
**Clinical Pearl / High-Yield Fact**
Inborn errors of metabolism can present with a wide range of symptoms, including seizures, skin rashes, and metabolic acidosis. A key part of the diagnosis is the measurement of specific metabolites, such as ammonia, lactate, and ketones, which can help to identify the underlying disorder.
**Correct Answer:** Not provided - Please provide the options for a complete explanation.