- Open Access
Pros and cons of tetrastarch solution for critically ill patients
Journal of Intensive Care volume 2, Article number: 23 (2014)
Proper fluid management is crucial for the management of critically ill patients. However, there is a continuing debate about the choice of the fluid, i.e., crystalloid vs. colloid. Colloid solution is theoretically advantageous to the crystalloid because of larger volume effect and less interstitial fluid accumulation, and hydroxyethyl starch (HES) is most frequently used for perioperative setting. Nevertheless, application of HES solution is relatively limited due to its side effects including renal toxicity and coagulopathy. Since prolonged presence of large HES molecule is responsible for these side effects, rapidly degradable HES solution with low degree of substitution (tetrastarch) supposedly has less potential for negative effects. Thus, tetrastarch may be more frequently used in the ICU setting. However, several large-scale randomized trials reported that administration of tetrastarch solution to the patients with severe sepsis has negative effects on mortality and renal function. These results triggered further debate and regulatory responses around the world. This narrative review intended to describe the currently available evidence about the advantages and disadvantages of tetrastarch in the ICU setting.
In the perioperative setting, goal-directed fluid management using hydroxyethyl starch (HES) preparation has been successfully implemented [1, 2]. However, recent randomized controlled studies targeted for critically ill patients demonstrated contradictory results. In this narrative review, advantages and disadvantages of HES preparation, especially most recently developed HES solution with degree of substitution of 0.4 (tetrastarch, HES 130/0.4 or HES 130/0.42), which has low-molecular weight and is rapidly degradable, for fluid resuscitation in ICU or ER setting is discussed.
Characteristics of HES
Starch is a branched polymer of glucose, and it has poor solubility and is rapidly metabolized by α-amylase. To make the starch molecule more soluble and provide clinically relevant persistence in the circulation, some of hydroxyl moiety of starch molecule is substituted with hydroxyethyl residue. The degree of substitution (DS) represents the ratio between hydroxymethylated and unsubstituted portion. C2/C6 ratio represents the position of the carbon atom skeleton of glucose where the substitution predominantly occurs. HES molecule with lower DS and C2/C6 ratio is more susceptible to the effects of amylase and more rapidly eliminated from the circulation than HES molecule with higher DS and C2/C6 ratio [4–6]. The number and the size of the metabolized HES molecule remained in the circulation (in vivo molecular weight) play important roles on the volume effects and side effects of the HES solution [7, 8]. Thus, the development has been aimed for HES preparations with low DS, and currently, HES preparation with DS of 0.4 or 0.42 (HES 130/0.4 and HES 130/0.42) is the most advanced solution to date. These solutions are sometimes called tetrastarch according to the number of their DS. Characteristics of several HES preparations as well as other colloids such as albumin and gelatin are summarized in Table 2[9–15]. In this article, the advantages and disadvantages of tetrastarch against other colloids and crystalloids are reviewed.
Advantages of tetrastarch
Smaller infused volume and prolonged increase in plasma volume
Theoretically, colloid solution exerts three to four times larger volume expansion compared to crystalloid solution. This paradigm has been confirmed in healthy volunteers , but the volume effect seems much smaller than such theoretical value in the clinical situations. Actually, most of the studies reported that both HES and albumin demonstrated 1.4 to 1.8 times larger volume effects than crystalloid [14, 17–21]. Although some of the authors concluded that the difference was not clinically relevant, we assume that the difference remains clinically relevant since favorable outcome could be achieved with even moderately restrictive fluid regimen in patients with acute respiratory distress syndrome [22, 23].
Several studies demonstrated anti-inflammatory properties and endothelial protection by tetrastarch [24–28]. However, relevant clinical study is not available due to its retraction . Recently, endothelial glycocalyx is recognized to play an important role in the control of vascular permeability [30–33]. In vitro model of coronary vasculature, HES 130/0.4 partially attenuated the negative effects of glycocalyx destruction by heparinase [34, 35]. This finding potentially suggests the possible protective effects of tetrastarch molecule in inflammation-related glycocalyx damage.
Disadvantages of tetrastarch
Older HES preparations are known to negatively affect the renal integrity. However, tetrastarch undergoes rapid metabolism and is generally assumed that such side effects are less clinically relevant. However, recent reports suggest even tetrastarch increases the risk of acute kidney injury and renal replacement therapy in ICU patients. In this section, we focused on the interpretation of recent reports about this topic.
In vitro study
In vitro study using cultured renal tubular cells demonstrated cytotoxic effect of HES 130/0.4 while crystalloid and albumin demonstrated protective effect . The author estimated that exposure of HES 130/0.4 concentration over 10 mg/ml for more than 4 h may exert deleterious effect on proximal renal tubular cells. Since no metabolism presumably occurs in their experimental setting, this result suggests that prolonged exposure of unmetabolized HES molecule may negatively affect the renal integrity.
Animal, in vivo studies in severe sepsis model
Several animal studies also investigated renal effects of HES 130/0.4 in septic shock model. In rats, HES 130/0.4 negatively affected renal function compared to sham-operated animals . However, interpretation of the data is somewhat difficult since the effects of HES 130/0.4 and crystalloid were not directly compared. In ewes, initial resuscitation of HES and crystalloid resulted similar serum creatinine concentration as well as microscopic finding of renal tubules [38, 39]. These data suggest that resuscitation with HES may not negatively affect renal function in septic shock animals.
Prospective study in penetrating trauma patients (FIRST study)
In resuscitation of penetrating trauma victims , early goal-directed therapy using HES 130/0.4 resulted in milder renal damage than that using saline.
Repetitive administration of large dose in traumatic brain injury patients
Retrospective study in ICU patients
A retrospective study demonstrated that use of HES 130/0.4 was not a risk factor of acute kidney injury in patients who stayed more than 72 h in the ICU .
Retrospective study in severe sepsis patients
Bayer et al. reported the sequential change of incidence of renal replacement therapy when the principle fluid choice was shifted from HES to gelatin to crystalloid [19, 42] in patients with severe sepsis and postcardiac surgical patients . The authors claimed that the study design was prospective and sequential; we think that the results should be interpreted as a retrospective analysis. They found that the incidence was highest in the period when HES was predominantly used compared to the period when gelatin or crystalloid was used. They concluded that administration of HES compromised renal function and increased the risk of renal replacement therapy. In these studies, the cumulative dose as well as the duration of HES administration was not reported. Thus, there is a fair possibility that HES had been used on multiple days during their ICU stay.
Prospective, randomized trial in severe sepsis patients (6S trial)
In this randomized, control trial (RCT) , 90-day mortality and the incidence of RRT were compared between buffer-based HES 130/0.42 and acetate Ringer solution in severe sepsis patients in ICU. In this trial, HES had been administered 3 days and more in about 50% of the participants and median cumulative dose of HES was reported as 44 ml/kg. Unfortunately, the largest quartiles of cumulative dose are not reported, and the relationship between cumulative dose and outcomes are not analyzed.
Prospective, randomized trial in ICU patients (CHEST study)
In this RCT , 90-day mortality, incidence of acute kidney injury (AKI) and requirement of renal replacement therapy were compared between saline-based HES 130/0.4 and saline. The inclusion criteria were less strict than the 6S trial and ICU patients who had the indication of fluid administration underwent randomization. The percentage of patients with sepsis was about 30% in both groups, and about 15% of the subjects received HES before randomization in both groups. The number of days with HES treatment as well as the cumulative dose was not explicitly described. It is noteworthy that both the HES and saline were liberally administered, and fluid balance was significantly positive especially in the latter part of the study period. There was no difference of 90-day mortality, but the number of patients who underwent renal replacement therapy was marginally but significantly higher in patients assigned to HES group (p = 0.04). The subgroup analysis revealed that the HES did not negatively affect the primary outcome in patients with sepsis and AKI before randomization. On the contrary, secondary cardiovascular failure was significantly reduced in patients randomized to HES group.
Prospective, randomized trial in severe sepsis patients (CRYSTMAS study)
In this RCT , hemodynamic effects, incidence of renal injury assessed with risk, injury, failure, loss, end-stage renal disease (RIFLE) criteria as well as several biomarker concentrations were compared between saline-based HES 130/0.4 and saline in severe sepsis patients. Although this study was much smaller than 6S trial and CHEST study, the target of fluid resuscitation and allowable limit of HES were clearly defined as 50 ml/kg on first day and 25 ml/kg afterward. There was no difference of AKI incidence assessed by RIFLE criteria and biomarkers.
This meta-analysis  investigated the effects of various HES preparations of HES on renal function. This report concluded that HES was associated with a significant increased risk of mortality and acute kidney injury. This conclusion is derived from the secondary analysis from ten articles including 6S trial, CHEST study, and CRYSTMAS study, but results from studies using different HES preparation were also included [12, 44].
Prospective, randomized trial in the treatment of hypovolemic shock (CRISTAL trial)
This recent RCT  compared colloid and crystalloid on the 28-day mortality, 90-day mortality, renal replacement-free days, ventilator-free days, and vasopressor-free days in patients with hypovolemic shock from various origins. Although this study is not solely focused on HES preparation, the results may be extrapolated to the effects of HES 130/0.4 since it was used in 70% of the colloid group. There was no difference in the 28-day mortality, but most of the secondary outcomes were better with the colloid group.
Clinical implications of HES-induced renal impairment
According to the in vitro study, the prolonged exposure of native HES molecule may be injurious to the renal tissue. Thus, the rapid degradation and elimination of HES molecule may be pivotal to preserve renal integrity. It is yet to be known whether the activity of α-amylase, main metabolic pathway of HES, is intact or impaired in patients with severe sepsis. From this standpoint, the renal damage of HES may be dose-dependent in certain populations and repetitive administration near the upper limit of the maximal dose to the patients with sepsis may not be advisable. Additionally, recent reports highlight the implications of chloride on renal function. This issue is more important for saline-based HES preparation. In volunteers, saline infusion reduced the renal microvascular blood flow compared to balanced solution . Furthermore, chloride-restrictive fluid management reduced renal damage in ICU patients , and postoperative hyperchloremia increased the mortality risk in surgical patients . Thus, excessive or liberal administration of chloride may not be also advisable.
Currently, five major pathways have been identified: (1) dilution of coagulation factors, (2) binding and inactivation of factor VIII (fVIII) and von Willebrand's factor (vWF), (3) inhibition of glycoprotein receptor IIb/IIIa (GP IIb/IIIa) on the surface of activated platelet, (4) inhibition of binding between GP IIb/IIIa and vWF or fibrinogen, and (5) acceleration of fibrin degradation [10, 49]. Accordingly, the effects of HES on dilution or binding and inactivation of fVIII or vWF may be evaluated with the plasma concentration of fVIII and vWF [50–53]. Inhibition of GP IIb/IIIa can be quantitated with platelet aggregometry , and overall effects may be estimated with viscoelastic analysis of coagulation such as rotational thromboelastometry .
Previous data indicate that these effects of HES on coagulation clearly depend on its pharmacokinetic profile, and prolonged presence of large HES molecule supposedly has the large impact on coagulation . Thus, tetrastarch should be least suppressive of coagulation system (Table 2). Furthermore, the presence of calcium in the carrier solution may attenuate the negative impact of HES on coagulation . Unfortunately, most of the currently available data are derived from perioperative setting, and only small numbers of studies from ICU are available.
Viscoelastic analysis with postcardiac surgery patients
This study compared the effects of 15 ml/kg of HES 130/0.4, HES 200/0.5, and 4% albumin on thromboelastometric tracing in patients after cardiac surgery in the ICU . The author found that clot formation time and maximal clot firmness was decreased immediately after the infusion of both HES preparations. Such changes were partially reversed 2 h after the infusion. On the contrary, albumin did not affect the results of the thromboelastometry. However, they found no difference of the amount of chest tube drainage between the three study groups.
The same authors compared the effects of 28 ml/kg of HES 130/0.4, gelatin, and crystalloid in the similar setting described in the previous paragraph . The author found that clot formation time and maximal clot firmness were decreased in the dose-dependent manner after the infusion of HES 130/0.4 and colloid. Only the changes after HES 130/0.4 infusion were returned to the pre-infusion level. On the contrary, crystalloid slightly but significantly potentiated coagulation. Again, they found no difference of the amount of chest tube drainage between the three study groups.
Meta-analysis of postcardiac surgical patients
This meta-analysis  selected 18 trials to examine the effects of HES on coagulation system in patients undergoing cardiopulmonary bypass. The author found that HES significantly increase the risk of postoperative blood loss and reoperation compared to albumin. The selected studies include the use of different types of HES preparation as well as various clinical contexts such as pump prime, intraoperative fluid administration, and fluid management in the ICU, and therefore, the effects of postoperative use of tetrastarch in the ICU on coagulation is inconclusive. However, the author commented that the analysis did not provide reassurance of a safety profile of tetrastarch due to the fact that sensitivity analysis did not found statistical difference between pentastarch and tetrastarch.
Repetitive administration of large dose in traumatic brain injury patients
This study is already mentioned in the renal impairment section. Most of the coagulation parameters such as platelet count, fibrinogen concentration, prothrombin time, partial thromboplastin time, and thromboelastographic analysis were comparable between HES 130/0.4 group and HES 200/0.5 supplemented with albumin group. However, plasma concentrations of FVIII and vWF were significantly higher in the HES 130/0.4 group. Such data can be extrapolated as repetitive administration of HES 130/0.4 may not have deleterious effect on coagulation in patients without major predisposing factor of coagulation dysfunction such as postcardiac surgical patients or sepsis .
Post hoc analysis of prospective, randomized trial in severe sepsis patients (6S trial)
In this analysis , the authors found increased incidence of bleeding in patients who were assigned to HES 130/0.42 group. Multivariate analysis revealed significantly increased risk of any bleeding in patients treated with buffer-based HES 130/0.42 compared to that with acetate Ringer's solution.
Clinical implications of HES-induced coagulopathy
Most of the previous studies indicate that the persistent presence of large HES molecule in the circulation may be responsible to the HES-induced coagulopathy. Thus, tetrastarch supposedly has more favorable profile on coagulation in patients without underlying coagulation disorders. However, risk–benefit ratio should be carefully evaluated in special populations such as patients after cardiopulmonary bypass and patients with sepsis.
The following interventions may successfully attenuate the effects of tetrastarch on coagulation. First, consider fibrinogen. Although obtained from perioperative setting, abnormalities of maximal clot firmness from rotational thromboelastometry after major bleeding and HES 130/0.4 administration can be successfully reversed by the administration of fibrinogen concentrates [62, 63]. These data intuitively suggest that monitoring and prompt supplementation of fibrinogen is imperative to prevent the consequences of HES-induced coagulation dysfunction. Second, consider supplement of calcium. Adequate ionized calcium is essential for coagulation system. However, saline-based HES 130/0.4, which is currently available in Japan, does not contain calcium in its carrier solution and predisposes the patients to potential hypocalcemia. Although a study with healthy volunteers demonstrated attenuated ADP-induced platelet aggregation and no difference of viscoelastic analysis in saline-based HES 130/0.4 compared to balanced HES 130/0.42 , we believe that careful monitoring and timely supplementation of calcium is also essential to attenuate HES-induced coagulopathy.
Pulmonary edema (capillary leak syndrome)
This is a relatively common concern about colloid administration that extravasated colloid may accentuate interstitial fluid accumulation and worsen pulmonary edema. However, the recent study using extravascular lung water evaluation by transpulmonary thermodilution method failed to substantiate this concern .
Pruritis and anaphylaxis
These issues may also be related to the molecular size of HES, and the incidences of such side effects are relatively low in tetrastarch [5, 66–69]. However, pruritus and skin rashes more frequently occurred in the CHEST study that compared HES 130/0.4 with saline .
Economical and regulatory issues
This issue is dependent on the price of HES, albumin, and crystalloid solution. In Japan, saline-based HES 130/0.4 costs six times higher than typical crystalloid solution, but albumin is approximately ten times more expensive than saline-based HES 130/0.4. Thus, the use of tetrastarch may be economically justifiable in Japan. However, the concern about renal damage caused by HES triggered various responses from each country. For example, European regulatory agency recommends withdrawal of HES preparation and several countries have already implemented such policy. In the US, the authority provided additional warning that made HES contraindicated to septic patients. In Japan, the authority made additional comment into the package insert of HES 130/0.4 basically stating ‘HES 130/0.4 may worsen patients' condition when administered to resuscitate relative hypovolemic state in critically ill patients including severe sepsis. HES 130/0.4 is indicated if therapeutic benefits clearly outweigh such risk’.
Currently, the advantages of the tetrastarch can be summarized as the following two issues. First, more efficient restoration of circulating blood volume with less interstitial fluid accumulation compared to crystalloid. Second, almost equivalent volume effect can be expected with much less cost compared to albumin. On the contrary, the disadvantage of tetrastarch is possible renal damage when given to critically ill patients for several days. Therefore, maximal advantages can be expected when given to the patients who is hypovolemic not caused by severe sepsis. Furthermore, we believe that it is imperative to define the cumulative dose limit of tetrastarch over several days.
degree of substitution
randomized controlled trial
Von Willebrand's factor.
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Yoshifumi Kotake received unrestricted research fund and speaker's fee from Otsuka Pharmaceuticals, which markets saline-based HES 130/0.4 in Japan. The other authors declare that they have no competing interests.
DT and SS abstracted the references and drafted the manuscript. YK conceived of the study and participated in its design and coordination and helped to draft the manuscript. All authors read and approved the final manuscript.
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Toyoda, D., Shinoda, S. & Kotake, Y. Pros and cons of tetrastarch solution for critically ill patients. j intensive care 2, 23 (2014). https://doi.org/10.1186/2052-0492-2-23
- Hydroxyethyl starch
- Critically ill
- Severe sepsis
- Acute kidney injury