Iron Deficiency in Young Children Beyond Anemia: Clinical Features, Maternal Factors, and the Predictor for Neuropsychomotor Development Delay

• Published in: Blood 2023-11, Vol.142 (Supplement 1), p.5233-5233
• Main Authors: Cheng, Mei-Mei, Hsiao, Ching-Heng, Liu, Yen-Lin, Chang, Hsi, Lee, Ya-Lin, Tsai, Min-Lan, Ho, Wan-Ling, Tseng, Sung-Hui, Weng, Tefu, Chang, Chia-Yau
• Format: Article
• Language: English
• ISSN: 0006-4971; 1528-0020
• DOI: 10.1182/blood-2023-173129

Introduction: Iron deficiency (ID) is the most common micronutrient deficiency in children and is prevalent in young children, especially in those with long-term exclusive breastfeeding (BF). Iron deficiency anemia (IDA), the most common type of pediatric anemia, while it is not the only clinical manifestation of ID. In Taiwan, prevalence of IDA was up to 23% in child-bearing women. It was reported that the iron levels in the breast milk of IDA mothers were markedly lower than that of non-IDA mothers. ID alone in young children can cause neurocognitive development symptoms, including inattention, psychomotor delay, cognition impairment, pica, etc, in children. However, clinical reports on ID, not IDA, are relatively few. We aimed to investigate the clinical features and influencing factors of ID in young children. Methods and Materials: There were 33 young children diagnosed as ID at outpatient department at Taipei Medical University Hospital from 2017 to 2019. The charts were retrospectively reviewed and clinical data were collected, including diagnostic age, initial symptoms, periods of breast-feeding (BF), hemoglobin (Hb), mean corpuscular volume (MCV), serum ferritin (SF), serum iron, total iron binding capacity (TIBC), zinc levels, thalassemia survey, duration of iron supplement, and laboratory improvement after iron supplement. Whether there were neuropsychomotor (NPMD) delay depended on the chart record of doctors of pediatric rehabilitation. Results: The median age of ID diagnosis was 2.5 years (range: 5 month－7.17 years). There were 31 (94%) of ID children initially presented with either koilonychias, picky eating, or poor appetite. 24 (72.7%) were found to have koilonychias, and among them, 18 (54.5%) had flat nails and 6 (18.2%) had spoon nails. 17 (51.5%) were picky eaters, 16 (48.5%) had poor appetite, 7 (21.2%) had pale nails, and 3 (9.1%) had pica. 11 (33.3%) had NPMD delay. The median duration of BF was 10.8 months (range: 0 to 36). There were 12 (36.4%) children whose mother had IDA. The median Hb was 11.2 g/dL (IQR: 10－12.65), median MCV was 76.45 fL, median SF level was 25 ng/mL (IQR: 13.25－45.5), and median transferrin saturation was 9.25% (IQR: 7－12.88). The median serum zinc level at diagnosis of ID was 66.4 μg/dL. In addition, 21 (63.6%) has concurrent zinc deficiency, 10 (30.3%) had pediatric IDA, and 2 (6.3%) had combined thalassemia trait. The median (IQR) duration of iron supplement is 3 (3-6) months. After treatment, patients' d