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Hyperammonemia in the pediatric emergency care setting
Nermeen M Galal1, Hala M Fouad, Amal Saied
1Emergency Department, Cairo University Specialized Pediatric Hospital, Cairo University, Cairo, Egypt. nermeengalal@gmail.com
Insights
Elevated ammonia levels are common in acutely ill children with altered levels of consciousness (ALOC). While mild elevations are frequent, very high ammonia levels warrant further investigation for serious conditions.
Area of Science:
- Pediatric Emergency Medicine
- Clinical Chemistry
- Metabolic Disorders
Background:
- Hyperammonemia is frequently observed in critically ill children presenting with altered levels of consciousness (ALOC).
- Ammonia levels can be transient or indicative of severe underlying conditions like inborn errors of metabolism.
- Factors such as sampling technique, transport, and analysis significantly influence ammonia level accuracy.
Purpose of the Study:
- To assess ammonia levels in acutely ill pediatric patients with ALOC.
- To identify the causes of hyperammonemia in this population.
- To correlate ammonia levels with disease severity and patient outcomes.
Main Methods:
- An observational study was conducted at Cairo University Specialized Paediatric Hospital's emergency department.
- Fifty acutely ill pediatric patients with ALOC were enrolled, excluding those with known hyperammonemia-inducing diseases.
- A control group of age- and sex-matched children was included for comparison.
Main Results:
- The mean blood ammonia level in children with ALOC was 95 μmol/L (range: 13–265 μmol/L).
- Sixty percent of patients had ammonia levels >75 μmol/L, and 6% had levels >200 μmol/L.
- A significant difference in ammonia levels was observed between the ALOC group and controls, with no correlation found with age, etiological diagnoses, laboratory parameters, illness duration, or severity scores.
Conclusions:
- Testing for hyperammonemia is recommended for children with ALOC, emphasizing understanding ammonia metabolism and influencing factors.
- Ensuring proper blood sample collection and handling is crucial for accurate ammonia level determination.
- While mild ammonia elevations are common, significantly high levels necessitate further evaluation for potential serious etiologies.
Unlabelled:
Hyperammonemia is encountered frequently in acutely ill children presenting for emergency care with altered levels of consciousness (ALOC). Ammonia production, metabolism, and excretion are affected by different variables. Hyperammonemia may be a transient state or may signify more grave etiologies as inborn errors of metabolism. Levels of ammonia are also affected by proper sampling technique, transport, and analysis.
Objectives:
To determine the level of ammonia in acutely ill children with ALOC, identify causes of hyperammonemia, and correlate levels with illness severity and morbidity.
Design:
Observational study.
Setting:
Emergency department at Cairo University Specialized Paediatric Hospital.
Methods:
Fifty cases of acutely ill pediatric patients with ALOC who presented to the emergency department were included in the study from 2008 through 2009. Emergency department patients (n = 20) with known diseases that may induce hyperammonemia were excluded. Patients were subjected to detailed history taking with emphasis on factors affecting ammonia levels and thorough clinical examination. A cohort group of age- and sex-matched children acted as a control group.
Results:
The measured blood ammonia level ranged between 13 and 265 μmol/L, with a mean level of 95 μmol/L. Sixty percent of the children with ALOC had ammonia levels of greater than 75 μmol/L, with levels greater than 200 μmol/L seen in 6% of the studied sample. The study demonstrated a highly significant statistical difference between children with ALOC and control groups.There was no correlation between blood ammonia level and age. Correlations of ammonia levels were also conducted in comparison with etiological diagnoses and laboratory parameters with no statistical significance.There was no statistical significance between ammonia level and duration of illness, Sequential Organ Failure Assessment score, or Glasgow Coma Scale score/Morray Scale score.
Conclusions:
Clinicians should consider testing children with ALOC for hyperammonemia, provided that a clear understanding of its metabolism and factors controlling it are understood. Proper sampling must be ensured. Mild elevations of ammonia levels are fairly common, but exceedingly high levels should raise concern and may require further evaluation.
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