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Published on: October 28, 2022
Metabolic Disorders among Children Presenting with Acute Encephalopathy
Kirti Singhal1, Meenakshi Bothra2, Seema Kapoor1
1Department of Pediatrics, MAMC and LNJP Hospital, Delhi, 110002, India.
Insights
Inborn errors of metabolism (IEM) are a significant cause of noninfectious encephalopathy (NIE) in Indian children. Early diagnosis and high suspicion are crucial for effective management of these metabolic disorders.
Area of Science:
- Pediatric Neurology
- Metabolic Disorders
- Neuroscience
Background:
- Acute noninfectious encephalopathy (NIE) presents a diagnostic challenge in pediatric populations.
- Identifying the underlying etiology is critical for appropriate patient management and prognosis.
- Inborn errors of metabolism (IEM) are a potential, often overlooked, cause of NIE.
Purpose of the Study:
- To elucidate the clinical and etiological profile of children diagnosed with NIE.
- To determine the prevalence of IEM among children presenting with NIE in a tertiary care setting.
- To highlight the diagnostic approaches for IEM in the context of NIE.
Main Methods:
- A descriptive cross-sectional study was conducted involving children aged over 28 days and under 12 years with acute encephalopathy, excluding CNS infections.
- Participants were evaluated using a structured proforma and a sequential battery of diagnostic tests.
- Suspected IEM cases underwent tandem mass spectrometry/gas chromatography-mass spectrometry (TMS/GCMS) and mutation analysis for confirmation.
Main Results:
- Fifty children with NIE were recruited; 18% (9 children) were diagnosed with IEMs, including lactic acidosis, glutaric aciduria, isovaleric academia, and hyperhomocysteinemia.
- The affected children ranged from 3 to 42 months, with a female predominance.
- Key indicators for IEM included a history of affected siblings and parental consanguinity; MS/MS and mutation analysis were essential for diagnosis.
Conclusions:
- Inborn errors of metabolism represent a substantial cause of noninfectious encephalopathy in the Indian pediatric population.
- A high index of clinical suspicion is necessary for timely diagnosis and intervention in cases of NIE.
- Metabolic investigations should be a key component in the etiological workup of acute noninfectious encephalopathy in children.
Objective:
To study the clinicoetiological profile of children presenting with acute noninfectious encephalopathy (NIE) and identify the proportion of children having inborn errors of metabolism (IEM).
Method:
This descriptive cross sectional study was conducted in a tertiary care centre in Northern India. Consecutive children, aged more than 28 d and less than 12 y, with acute encephalopathy were enrolled after ruling out CNS infection. All children were evaluated on an internally validated structured proforma. A sequential pre-decided battery of tests was applied to determine the cause of encephalopathy. IEM suspects were subjected to TMS/GCMS followed by mutation analysis for confirmation.
Results:
Fifty children with noninfectious encephalopathy (NIE) were recruited and metabolic causes were detected in 9 of these children (18%), aged 3 to 42 mo, with female preponderance. The IEMs included lactic acidosis (4), glutaric aciduria (3), isovaleric academia (1), and hyperhomocysteinemia (1). History of previously affected siblings and consanguinity between the parents were important indicators of IEM. MS/MS and mutation analysis were the mainstay of diagnosis in these patients. IEMs contributed to the most common cause amongst cases of NIE.
Conclusion:
IEMs constitute a significant proportion of NIE in India and a high index of suspicion is required to make the diagnosis.
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