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Inicio Allergologia et Immunopathologia Comparison of methemoglobin levels in food protein-induced enterocolitis syndrom...
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Vol. 48. Issue 5.
Pages 490-495 (September - October 2020)
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Vol. 48. Issue 5.
Pages 490-495 (September - October 2020)
Original Article
DOI: 10.1016/j.aller.2020.01.007
Comparison of methemoglobin levels in food protein-induced enterocolitis syndrome and other gastrointestinal diseases in neonates
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Eishi Makitaa,
Corresponding author
r0947em@jichi.ac.jp

Corresponding author.
, Sae Kurodaa,b, Hiroaki Satoa, Kae Itabashia, Atsuko Kawanoa, Misa Matsuuraa, Yohei Sugiyamaa, Daisuke Sugawaraa, Asami Maruyamaa, Ko Ichihashia
a Department of Pediatrics, Saitama Medical Center, Jichi Medical University, Saitama 330-8503, Japan
b Department of Pediatrics, Saitama Red Cross Hospital, Saitama 330-8553, Japan
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Figures (2)
Tables (2)
Table 1. Characteristics and vital signs in FPIES and non-FPIES groups.
Table 2. Laboratory findings in FPIES and non-FPIES groups.
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Abstract
Introduction and objectives

Methemoglobinemia has been reported to be associated with severe food protein-induced enterocolitis syndrome (FPIES). However, no reports have evaluated methemoglobin (MHb) levels in FPIES without symptomatic methemoglobinemia or the usefulness of MHb measurement for the diagnostic prediction of FPIES. To evaluate the MHb levels of patients with neonatal-onset FPIES and determine whether MHb levels are higher in FPIES than in other gastrointestinal diseases.

Patients and methods

Eleven neonates with severe acute FPIES (FPIES group) and 139 neonates with other gastrointestinal diseases (non-FPIES group) were included in this study. Patient characteristics, symptoms, and venous blood test values (MHb, pH, HCO3, and C-reactive protein) were evaluated.

Results

The median age at onset was 16 days vs. 1 day; males comprised 64% vs. 46%, the median gestational age was 38 weeks vs. 38 weeks, the median birth weight was 2710g vs. 2880g, and the median hospitalization duration was 31 days vs. 6 days for the FPIES vs. non-FPIES groups, respectively. MHb (%) was higher in the FPIES group than in the non-FPIES group [median (range), 1.1 (0.6–10.9) and 0.6 (0.3–1.2), respectively, p<0.001]. There were no differences in terms of pH, HCO3, and C-reactive protein (p>0.05). In the receiver operating characteristic analysis for FPIES diagnosis based on MHb (%), the area under the curve was 0.885, specificity was 97.1%, and sensitivity was 72.7% at a MHb cutoff of 1.0.

Conclusion

High MHb levels may help diagnose severe acute FPIES in neonates, but careful evaluation is needed.

Keywords:
Food allergy
Food protein-induced enterocolitis syndrome
Methemoglobin
Milk allergy
Newborn
Abbreviations:
CRP
FPIES
GI
HCO3
MHb
NICU
NO

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