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Arch Dis Child. Oct 2006; 91(10): 828–835.
Published online Jun 5, 2006. doi:  10.1136/adc.2005.088690
PMCID: PMC2066024

Hypotonic versus isotonic saline in hospitalised children: a systematic review

Abstract

Background

The traditional recommendations which suggest that hypotonic intravenous (IV) maintenance fluids are the solutions of choice in paediatric patients have not been rigorously tested in clinical trials, and may not be appropriate for all children.

Aims

To systematically review the evidence from studies evaluating the safety of administering hypotonic versus isotonic IV maintenance fluids in hospitalised children.

Methods

Data sources: Medline (1966–2006), Embase (1980–2006), the Cochrane Library, abstract proceedings, personal files, and reference lists. Studies that compared hypotonic to isotonic maintenance solutions in children were selected. Case reports and studies in neonates or patients with a pre‐existing history of hyponatraemia were excluded.

Results

Six studies met the selection criteria. A meta‐analysis combining these studies showed that hypotonic solutions significantly increased the risk of developing acute hyponatraemia (OR 17.22; 95% CI 8.67 to 34.2), and resulted in greater patient morbidity.

Conclusions

The current practice of prescribing IV maintenance fluids in children is based on limited clinical experimental evidence from poorly and differently designed studies, where bias could possibly raise doubt about the results. They do not provide evidence for optimal fluid and electrolyte homoeostasis in hospitalised children. This systematic review indicates potential harm with hypotonic solutions in children, which can be anticipated and avoided with isotonic solutions. No single fluid rate or composition is ideal for all children. However, isotonic or near‐isotonic solutions may be more physiological, and therefore a safer choice in the acute phase of illness and perioperative period.

Keywords: intravenous fluids, hypotonic, isotonic, hyponatraemia

Intravenous (IV) maintenance fluids are designed to provide free water and electrolyte requirements in a fasting patient. The prescription for IV maintenance fluids was originally described in 1957 by Holliday and Segar, who equated free water requirements from energy expenditure in healthy children.1 They rationalised adding 3.0 and 2.0 mEq/100 kcal/24 h of sodium and potassium respectively, as it approximates the electrolyte requirements and urinary excretion in healthy infants.2,3 This is the basis for the current recommendation that hypotonic IV maintenance solutions are ideal for children.4,5 The Holliday–Segar system remains the most universally used to date, because of the simplicity of their formula. While these recommendations may be appropriate for the healthy child, they do not necessarily apply in acute illness, where energy expenditure and electrolyte requirements deviate significantly from this formula.6

The numbers of deaths and significant neurological sequelae from hospital acquired hyponatraemia in children receiving hypotonic maintenance solutions have increased in the past 10 years.7,8,9,10,11 Several narrative reviews have suggested potential harm with these solutions and recommend that routine use in children be reconsidered.12,13 Despite these concerns, standard texts and guidelines continue to recommend hypotonic maintenance solutions for all paediatric patients.4,5 The objective of this systematic review was to evaluate the safety of hypotonic versus isotonic IV maintenance solutions in hospitalised children. Our secondary objective was to identify subgroups who are at greater risk of morbidity, in whom hypotonic solutions should be avoided.

Methods

Search strategy

We searched Medline (1966–2006), Embase (1980–2006), and the Cochrane Library, using the terms: “fluid therapy”, “hypotonic solution”, “isotonic solution”, and synonyms or related terms (Appendix 1; see http://www.archdischild.com/supplemental). We searched online (FirstSearch, Conference Proceedings) or published conference proceedings, and Current Controlled Trials (www.controlled‐trials.com). Abstracts from the following 2002–05 scientific forums were hand searched: World Congress on Pediatric Intensive Care, Society for Pediatric Research, Critical Care Congress, and American Academy of Pediatrics. We reviewed the reference lists of all identified studies and reviews, and also personal files, and contacted experts and first authors to identify other published or unpublished studies.

Study selection

Citations considered potentially relevant by either of two reviewers (KC or MK) were retrieved using the following inclusion criteria:

  • Controlled trials, cohort, and case‐control studies. Cohort studies had to compare patients receiving hypotonic IV maintenance solutions with a control group or unexposed cohort who received isotonic solutions. Case‐control studies had to compare cases, to a control group who did not have the outcomes of interest.
  • Children (1 month to 17 years) hospitalised for any medical or surgical condition. We included a diverse paediatric population to capture all potential patients who currently receive “standard IV maintenance therapy”.
  • Intervention: currently used hypotonic and isotonic IV maintenance solutions. Solutions were classified as “hypotonic” if they contained <0.9% NaCl, or “isotonic or near isotonic” (i.e. 0.9% NaCl or Ringers Lactate). We excluded case reports and studies of fluid resuscitation and oral rehydration therapy. Studies enrolling neonates, patients with pre‐existing hyponatraemia and co‐morbidities which result in sodium derangements (e.g. renal disease, diabetes insipidus, diuretic therapy), were also excluded.

Study outcomes

Studies were included if any of the following outcomes related to the development of acute hospital acquired plasma sodium (PNa) derangements and/or their attributed morbidity were reported: fluid balance, clinical evidence of volume overload, hypertension, seizures, cerebral oedema, death, paediatric intensive care unit admission, and length of stay. We used PNa as a surrogate outcome, as it is a convenient reflection of tonicity balance, and represents the potential for fluid shifts between intracellular and extracellular fluid (ECF) compartments. This in turn may result in clinically relevant morbidity, such as the defined outcomes of interest. A priori, we defined hyponatraemia as PNa <136 mmol/l, and severe hyponatraemia as PNa <130 mmol/l, or any level of hyponatraemia associated with symptoms. We also examined hypernatraemia since the arguments against the use of isotonic solutions in children include renal solute loading and the risk of increasing PNa. We defined hypernatraemia as PNa >145 mmol/l.

Data abstraction and study quality

In duplicate and independently, we abstracted data to describe the methodological quality and clinical characteristics of these trials. We contacted authors where necessary for additional data on outcomes of interest. We extracted the following information: study population, sample size, intervention, duration, and type of exposure and outcomes. The methodological quality of included studies was assessed using predefined criteria (Appendices 2 and 3; see http://www.archdischild.com/supplemental).

Data analysis

Cohen's Kappa statistic was used to calculate agreement between raters. For categorical outcomes, treatment effects were expressed as odds ratios (OR) and 95% confidence intervals (CI). We described treatment effects of continuous outcomes using weighted mean differences (WMD) and 95% CI. We calculated summary risk differences and 95% CI using a random effects model (RevMan Version 4.2). Where statistical pooling was not possible, we described our findings qualitatively.

Results

Study selection

We identified 52 potentially relevant articles from 104 citations (fig 11);); 33 did not meet inclusion criteria. Of the 19 studies retrieved for detailed evaluation, seven did not describe or compare the interventions of interest, four did not describe a control group, and two did not report any of the outcomes of interest. Six studies satisfied all criteria (table 11).). Cohen's Kappa for inclusion decisions was 0.81 (almost perfect agreement).

figure ac88690.f1
Figure 1 Flow diagram of the study selection process for this systematic review.33
Table thumbnail
Table 1 Characteristics of included studies

Study characteristics

We report the characteristics of the six included studies in table 11.. There were two unmasked randomised controlled trials (RCT),14,15 and one non‐randomised controlled trial.16 Three were observational studies.17,18,1919TablesTables 3–5 outline the study quality and methodological characteristics—the overall quality of included studies was often limited; allocation concealment, blinding of patients, clinicians, outcomes assessors, and outcomes were inconsistently or not reported across studies.

Table thumbnail
Table 2 Characteristics of excluded studies
Table thumbnail
Table 3 Quality assessment; controlled trials
Table thumbnail
Table 4 Quality assessment; observational studies—cohort studies
Table thumbnail
Table 5 Quality assessment; observational studies—case‐control studies

Clinical outcomes

Plasma sodium

The standard deviations (SD) were not presented for PNa in one of the studies.14 Thus, we calculated a pooled SD to compare the PNa across studies. Hypotonic maintenance solutions significantly increased the risk of developing hyponatraemia (OR 17.22; 95% CI 8.67 to 34.2) (fig 22).). Mean PNa in patients following hypotonic solutions was significantly lower (−3.39 mmol/l; 95% CI −5.35 to −1.43), than those who received isotonic solutions (fig 33).). The PNa also decreased significantly greater in patients who received hypotonic solutions (−5.37 mmol/l; 95% CI −8.79 to −1.94, fig 44).). None of the studies reported the development of hypernatraemia. However, three studies reported a decrease in PNa despite the infusion of isotonic or near‐isotonic IV maintenance fluids (table 11).15,17

figure ac88690.f2
Figure 2 Forrest plot summarising the odds ratios and associated 95% confidence intervals for developing hyponatraemia in children receiving hypotonic compared to isotonic IV maintenance fluids.
figure ac88690.f3
Figure 3 Comparison of PNa levels following hypotonic versus isotonic or near‐isotonic IV maintenance fluids.
figure ac88690.f4
Figure 4 Mean change in PNa following hypotonic versus isotonic IV maintenance fluids.

Morbidity attributed to hyponatraemia

Adverse clinical outcomes were reported in three studies.17,18,19 Wilkinson reported seizures in 2/26 patients receiving hypotonic fluids (OR 6.22; 95% CI 0.29 to 135.8).19 Hoorn reported nausea and vomiting more commonly in patients with hospital acquired hyponatraemia (68%, p = 0.008)18 than isonatraemic controls. The presence of increased pulmonary interstitial fluid on chest x ray was reported by Burrows in 15/20 of patients receiving hypotonic solutions and 2/4 in the near‐isotonic group.20 The clinical significance of this finding was not commented on by the authors. Other outcomes of interest as listed in our objectives were not reported.

Volume of IV fluid administration

Hoorn reported that patients with hospital acquired hyponatraemia did not receive significantly greater total fluid volume than isonatraemic patients, however the calculated electrolyte‐free water intake was three times greater compared to the isonatraemic controls (p < 0.001). The total sodium intake in mmol/kg/h was not significantly different between the two groups.18 The volume of IV fluid infused was not a determinant of the change in PNa at four hours in Neville's study of patients with gastroenteritis.15 Fluid balance and volumes of fluid infused were not specifically presented in the other studies, but described as “same in both groups”.

Subgroups

Four of the included studies were in surgical patients,14,16,17,19 and one study enrolled patients with gastroenteritis.15 Hoorn identified more surgical patients in the hospital acquired hyponatraemia group (16%), than in the isonatraemic controls (5%, p = 0.04).18 All studies examined associations using univariate analyses; none used multivariate analyses to adjust for confounding factors.

Heterogeneity

Given the small number of studies, we chose to include and analyse results from both controlled trials and observational studies. Visual inspection of the Forrest plots indicated study heterogeneity; however formal statistical tests in this instance are underpowered to detect and adjust for clinically important heterogeneity, given the small number of outcomes, patients, and studies. We thus chose to describe the sources of clinical heterogeneity. (1) Patients included in this systematic review were heterogeneous, however the majority of studies were in the surgical population. (2) The degree of exposure to the interventions varied between studies—the timing of PNa measurements occurred after variable degrees and duration of exposure to intervention. (3) The majority of studies were limited in their quality ((tablestables 3–5). Despite apparent heterogeneity in study design, participants, and quality among these studies, the treatment effect nevertheless appears to be remarkably consistent across the studies.

Discussion

Intravenous fluids are used in children to either expand a contracted ECF space or as “maintenance” to replace urine output and insensible losses. In the former instance isotonic or near‐isotonic saline is recommended on the basis that it is the physiologically appropriate solution. In the latter case hypotonic saline solutions are the accepted standard of care. This systematic review reveals that the evidence for the safety of this ubiquitous practice is limited, with only six published studies (only two of which were RCTs) reporting data on a total of 404 patients. The current level of evidence suggests that hypotonic maintenance solutions in children are not benign, but in fact potentially dangerous. The overall treatment effect is remarkable with the odds of developing hyponatraemia following hypotonic solutions being 17.2 times greater than with isotonic fluids. Hence, there are potential risks associated with the use of hypotonic solutions in children, such as cerebral oedema precipitated by an acute fall in serum osmolality.

Hyponatraemia occurs due to a positive balance of electrolyte free water, combined with an impaired ability to excrete hypotonic urine secondary to ADH secretion. A significant correlation between free water intake and decrease in PNa has been demonstrated.20 The primary source of electrolyte free water is the exogenous administration of hypotonic fluid. In contrast to healthy individuals, hospitalised patients have multiple non‐osmotic stimuli for ADH secretion, which prevents them from producing water diuresis even in the presence of a PNa that is lower than 136 mmol/l.12,15,21 In such patients, there will be very little if any excretion of electrolyte free water, because ADH makes the later parts of the distal nephron permeable to water.22 The risk of hyponatraemia in these patients is under‐recognised,14,17,21 and is thus compounded by the administration of hypotonic solutions. However, the administration of isotonic maintenance solutions at least in children with meningitis, has been shown to result in a more rapid return of ADH to normal concentrations, when compared to hypotonic fluids.23 Neville demonstrated that patients admitted with gastroenteritis have obligate urinary sodium losses irrespective of initial PNa.15 The urinary tonicity at presentation of these patients approximates that of normal saline. Therefore infusion of a hypotonic solution which is lower in tonicity than that of urine passed is predictive of a decrease in subsequent PNa.

The concern that isotonic maintenance fluids may cause hypernatraemia is not supported in the studies we reviewed, nor is it reported in adults where the use of isotonic solutions is routine. On the contrary, the risks of hyponatraemia may also extend to patients who receive isotonic fluid.14,15,16,21,24 This can be explained at least in part by the excretion of relatively hypertonic urine as demonstrated by Neville and others.15,24,25 Steele observed that the expansion of the ECF with Ringers Lactate in the perioperative period results in the production of a hypertonic urine resulting in “desalination”.26 However, hypernatraemia can occur during the administration of isotonic saline if a hypotonic urine is produced, leading to a positive sodium balance.

What is already known on this topic

  • The current standard of prescribing maintenance IV fluids is based on historical evidence
  • The safety of this practice is yet to be tested in well conducted clinical trials

The traditional guidelines for fluids in children, published 50 years ago, and more recently reiterated,27,28 were derived from estimates of insensible water losses, and electrolyte requirements for normal growth.1 These calculations have since been criticised, and may lead to an overestimation of hypotonic fluid requirement in sick children.6,29 It has been demonstrated that it is not simply Na+ intake, but moreover its ratio to electrolyte free water intake that influences PNa.18 These findings challenge the previous recommendations made by Holliday and Segar, and argue for a maintenance solution and volume which maintains tonicity balance during acute illness, rather than one which merely provides a daily sodium or caloric requirement. We used PNa as a surrogate measure of morbidity related to fluid shifts between intra‐ and extracellular compartments. PNa is a convenient marker as it reflects the ratio between effective osmoles and total body water. As Na+ is the principal extracellular cation and therefore the main determinant of ECF volume, it regulates water movement across cell membranes and explains the development of intracellular oedema that occurs in the presence of hyponatraemia. The expansion of intracellular fluid volume is of major importance in the central nervous system as the brain is confined in a rigid bony cage and has only limited ability to expand. Thus brain cell swelling is very likely to increase intracranial pressure and predispose to brain herniation. Children are at greater risk of this sequela because their brains have a larger intracellular fluid volume per total skull volume.30 Certainly among children who develop symptomatic hyponatraemia, the incidence of permanent brain damage is substantially higher than in adults.31

The results of this systematic review validate the growing concerns expressed in reports which question the safety of our current practice.13,32 The strengths of this report include a comprehensive search strategy, explicit selection criteria for relevant primary studies, reliability assessment of study screening and study quality, validity assessment of primary studies, statistical pooling of effect sizes, focus on adverse events, and reporting according to QUOROM guidelines.33 The weaknesses are that most studies reviewed were heterogeneous in design, small, and of variable quality, did not allow for confounding factors, and focused on a limited paediatric population. Therefore we cannot state with certainty that the principles are applicable to all children prescribed IV maintenance fluids. On the other hand, we can state that, based on published case reports of deaths and neurological injury from acute hyponatraemia that the administration of hypotonic solutions to children with a PNa <138 mmol/l is potentially hazardous, given the fact that ADH is likely to be acting.

Conclusions

The current practice of prescribing IV maintenance fluids in children is not based on clinical experimental evidence using patient‐important outcomes, and does not provide optimal fluid and electrolyte homoeostasis in hospitalised children. There is evidence that, at least in some paediatric patients, hypotonic solutions exacerbate the risks of hyponatraemia, while isotonic solutions may be protective. Our current responsibility however, is to refrain from adopting a “new standard of care”, until rigorous clinical trials comparing the safety and effectiveness of different IV fluid regimens in children have been completed.

What this study adds

  • This is the first systematic review which examines the evidence for standard IV maintenance solutions in children
  • This review provides evidence that, at least in some paediatric patients, hypotonic solutions exacerbate the risks of hyponatraemia, while isotonic solutions may be protective

Supplementary Material

[web only appendix]

Acknowledgements

The authors wish to thank Dr Deborah Cook (Professor, Departments of Medicine and Clinical Epidemiology and Biostatistics, McMaster University), for her assistance in the preparation of this manuscript.

Abbreviations

CI - confidence interval

ECF - extracellular fluid

IV - intravenous

PNa - plasma sodium

RCT - randomised controlled trial

WMD - weighted mean difference

Footnotes

Competing interests: none declared

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