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Sodium and potassium in red blood cells of premature infants during the first few days: risk of hyperkalaemia Sato K; Kondo T; Iwao H; Honda S; Ueda KActa Paediatr Scand 1991[Oct]; 80 (10): 899-904Erythrocyte sodium and potassium were studied in 64 newborn infants including 21 very low birthweight infants (birthweight less than 1500 g) during the first three days after birth. Erythrocyte sodium showed a positive correlation with gestational age (r = 0.63, p less than 0.01) and birthweight (r = 0.66, p less than 0.01). Erythrocyte potassium was negatively correlated with birthweight (r = -0.33, p less than 0.05). The Na/K ratio in red blood cells showed a positive correlation with gestational age (r = 0.60, p less than 0.01) and birthweight (r = 0.65, p less than 0.01). In VLBW infants plasma potassium rose significantly (p less than 0.01) from 0-6 h to 12-30 h and decreased from 12-30 h to 30-60 h (p less than 0.05). Erythrocyte potassium decreased slightly from 0-6 h to 12-30 h, but not significantly. A new finding that "more immature infants have higher potassium and lower sodium concentration in RBC" may suggest a potential risk of hyperkalaemia in tiny infants.|Erythrocytes/*metabolism[MESH]|Gestational Age[MESH]|Humans[MESH]|Hyperkalemia/*etiology[MESH]|Infant, Low Birth Weight/*blood[MESH]|Infant, Newborn[MESH]|Infant, Premature, Diseases/*etiology[MESH]|Infant, Premature/*blood[MESH]|Potassium/*blood[MESH]|Risk Factors[MESH]|Sodium/*blood[MESH]|Time Factors[MESH] |
