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Background Iatrogenic hyponatremia is a common complication following intravenous maintenance fluid therapy (IV-MFT) in hospitalized children. Despite the American Academy of Pediatrics' 2018 recommendations, IV-MFT prescribing practices still vary considerably. Objectives This meta-analysis aimed to compare the safety and efficacy of isotonic versus hypotonic IV-MFT in hospitalized children. Data sources We searched PubMed, Scopus, Web of Science, and Cochrane Central from inception to October 1, 2022. Study eligibility criteria We included randomized controlled trials (RCTs) comparing isotonic versus hypotonic IV-MFT in hospitalized children, either with medical or surgical conditions. Our primary outcome was hyponatremia following IV-MFT. Secondary outcomes included hypernatremia, serum sodium, serum potassium, serum osmolarity, blood pH, blood sugar, serum creatinine, serum chloride, urinary sodium, length of hospital stay, and adverse outcomes. Study appraisal and synthesis methods Random-effects models were used to pool the extracted data. We performed our analysis based on the duration of fluid administration (i.e., ≤ 24 and > 24 h). The Grades of Recommendations Assessment Development and Evaluation (GRADE) scale was used to evaluate the strength and level of evidence for recommendations. Results A total of 33 RCTs, comprising 5049 patients were included. Isotonic IV-MFT significantly reduced the risk of mild hyponatremia at both ≤ 24 h (RR = 0.38, 95% CI [0.30, 0.48], P < 0.00001; high quality of evidence) and > 24 h (RR = 0.47, 95% CI [0.37, 0.62], P < 0.00001; high quality of evidence). This protective effect of isotonic fluid was maintained in most examined subgroups. Isotonic IV-MFT significantly increased the risk of hypernatremia in neonates (RR = 3.74, 95% CI [1.42, 9.85], P = 0.008). In addition, it significantly increased serum creatinine at ≤ 24 h (MD = 0.89, 95% CI [0.84, 0.94], P < 0.00001) and decreased blood pH (MD = –0.05, 95% CI [–0.08 to –0.02], P = 0.0006). Mean serum sodium, serum osmolarity, and serum chloride were lower in the hypotonic group at ≤ 24 h. The two fluids were comparable in terms of serum potassium, length of hospital stay, blood sugar, and the risk of adverse outcomes. Limitations The main limitation of our study was the heterogeneity of the included studies. Conclusions and implications of key findings Isotonic IV-MFT was superior to the hypotonic one in reducing the risk of iatrogenic hyponatremia in hospitalized children. However, it increases the risk of hypernatremia in neonates and may lead to renal dysfunction. Given that the risk of hypernatremia is not important even in the neonates, we propose to use balanced isotonic IV-MFT in hospitalized children as it is better tolerated by the kidneys than 0.9% saline. Systematic review registration number CRD42022372359.
Background Iatrogenic hyponatremia is a common complication following intravenous maintenance fluid therapy (IV-MFT) in hospitalized children. Despite the American Academy of Pediatrics' 2018 recommendations, IV-MFT prescribing practices still vary considerably. Objectives This meta-analysis aimed to compare the safety and efficacy of isotonic versus hypotonic IV-MFT in hospitalized children. Data sources We searched PubMed, Scopus, Web of Science, and Cochrane Central from inception to October 1, 2022. Study eligibility criteria We included randomized controlled trials (RCTs) comparing isotonic versus hypotonic IV-MFT in hospitalized children, either with medical or surgical conditions. Our primary outcome was hyponatremia following IV-MFT. Secondary outcomes included hypernatremia, serum sodium, serum potassium, serum osmolarity, blood pH, blood sugar, serum creatinine, serum chloride, urinary sodium, length of hospital stay, and adverse outcomes. Study appraisal and synthesis methods Random-effects models were used to pool the extracted data. We performed our analysis based on the duration of fluid administration (i.e., ≤ 24 and > 24 h). The Grades of Recommendations Assessment Development and Evaluation (GRADE) scale was used to evaluate the strength and level of evidence for recommendations. Results A total of 33 RCTs, comprising 5049 patients were included. Isotonic IV-MFT significantly reduced the risk of mild hyponatremia at both ≤ 24 h (RR = 0.38, 95% CI [0.30, 0.48], P < 0.00001; high quality of evidence) and > 24 h (RR = 0.47, 95% CI [0.37, 0.62], P < 0.00001; high quality of evidence). This protective effect of isotonic fluid was maintained in most examined subgroups. Isotonic IV-MFT significantly increased the risk of hypernatremia in neonates (RR = 3.74, 95% CI [1.42, 9.85], P = 0.008). In addition, it significantly increased serum creatinine at ≤ 24 h (MD = 0.89, 95% CI [0.84, 0.94], P < 0.00001) and decreased blood pH (MD = –0.05, 95% CI [–0.08 to –0.02], P = 0.0006). Mean serum sodium, serum osmolarity, and serum chloride were lower in the hypotonic group at ≤ 24 h. The two fluids were comparable in terms of serum potassium, length of hospital stay, blood sugar, and the risk of adverse outcomes. Limitations The main limitation of our study was the heterogeneity of the included studies. Conclusions and implications of key findings Isotonic IV-MFT was superior to the hypotonic one in reducing the risk of iatrogenic hyponatremia in hospitalized children. However, it increases the risk of hypernatremia in neonates and may lead to renal dysfunction. Given that the risk of hypernatremia is not important even in the neonates, we propose to use balanced isotonic IV-MFT in hospitalized children as it is better tolerated by the kidneys than 0.9% saline. Systematic review registration number CRD42022372359.
BACKGROUND: In recent years, neonatal surgery has been developing and improving, among other things, because of a deeper study of anesthesiological approaches and the introduction of acquired knowledge into the daily practice of an anesthesiologist-resuscitator. One of the basic factors that influence treatment outcomes in the future is a thorough study of infusion therapy methods in newborns, considering the anatomical and physiological characteristics of the neonatal period. AIM: This study aimed to examine the electrolyte balance, acid–base state, and hemodynamic parameters in newborns, depending on the choice of basic infusion medium during surgery. MATERIALS AND METHODS: A prospective study was conducted in 99 newborns. All children were given an infusion of saline solutions of 10 mL/kg/h during surgery. Groups I, II, and III were administered intraoperatively with isotonic Sterofundin, saline solution, and Ringer’s solution, respectively. A hypotonic sodium chloride solution of 0.45% was administered to 11 children. The indicators of the acid–base state and electrolyte composition of the venous blood, hemodynamic parameters, and need for perioperative inotropic support were evaluated. RESULTS: A tendency to hyponatremia was detected in children who were infused with 0.45% sodium chloride hypotonic solution, which resulted in the abandonment of further recruitment of children in the group and the implementation of this study option. After surgery, the pH-compensated state was maintained in all three groups. Moreover, metabolic disorders in the form of a decrease in bicarbonates and ВE were recorded in all groups. Electrolyte disturbances were detected in all groups, whereas electrolyte balance was most often registered in group I. In groups II and III, common ionogram findings included a decrease in potassium and an increase in sodium, chlorine, and calcium levels. In the analysis of the hemodynamic parameters, no significant statistical difference was recorded during surgery when comparing the groups infused with different saline media. CONCLUSIONS: In this study, no significant differences were found in the indicators of acid–base state and hemodynamic parameters when using different saline solutions as basic intraoperative infusion therapy in newborns. Regarding the electrolyte balance, the most common complications were hypokalemia, hypernatremia, and hyperchloremia in the 0% saline group.
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