A patient presented to casualty with nausea, vomiting. Intravenous glucose was given & the patient recovered. After few months, patient presented with same complaints. Blood glutamine was found to be increased. Also uracil levels were raised. What is the diagnosis?
## **Core Concept**
The patient's symptoms of nausea, vomiting, and response to intravenous glucose suggest an issue with energy metabolism or a condition that leads to episodes of metabolic crisis. The elevated blood glutamine and uracil levels point towards a disorder of amino acid metabolism.
## **Why the Correct Answer is Right**
The correct answer, **Hyperammonemia due to Ornithine Transcarbamylase (OTC) deficiency**, is a urea cycle disorder. In OTC deficiency, the body cannot properly process nitrogen waste, leading to hyperammonemia. Glutamine levels rise as the body tries to detoxify ammonia by converting it into glutamine. Uracil levels are elevated because OTC is also involved in the pyrimidine synthesis pathway; its deficiency leads to an accumulation of carbamoyl phosphate, which is then shunted towards pyrimidine synthesis, increasing uracil production. This condition explains the patient's symptoms and lab findings.
## **Why Each Wrong Option is Incorrect**
- **Option A:** This option is incorrect because it does not specify a condition related to the provided clinical and lab findings.
- **Option B:** This option does not directly relate to the symptoms and lab findings described, particularly the specific elevations of glutamine and uracil.
- **Option C:** While this could potentially relate to metabolic disorders, it is not specific and does not directly explain the lab findings.
## **Clinical Pearl / High-Yield Fact**
A key point to remember is that urea cycle disorders, like OTC deficiency, can present with nonspecific symptoms such as nausea and vomiting but can be identified through specific laboratory findings like elevated glutamine and uracil levels. These disorders often require immediate treatment to prevent severe neurological damage.
## **Correct Answer:** D. Hyperammonemia due to Ornithine Transcarbamylase deficiency.