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Clinical Concepts and Commentary

Effects of Hydroxyethyl Starch Solutions on Hemostasis

Kozek-Langenecker, Sibylle A. M.D.*

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HYDROXYETHYL starch (HES) solutions are frequently used plasma expanders that are indicated to restore and maintain intravascular volume, to stabilize hemodynamic conditions, and to improve tissue perfusion. According to these clinical indications, HES is used in perioperative situations with a high risk of bleeding. Side effects of HES on hemostasis pose serious limitations to the clinical use of this artificial colloid. Recent developments have centered around designing new starch molecules by modulating their pharmacochemical characteristics to increase colloid osmotic pressure and hemodynamic efficacy while minimizing the risk of adverse reactions such as antithrombotic effects. The aim of this Clinical Concepts and Commentary article is to provide clinicians with a brief overview of the literature on potential side effects of various HES preparations, including hetastarches, pentastarches, and the novel tetrastarches, on both plasmatic and cellular hemostasis.
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Fig. 1
Fig. 1
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Table 1
Table 1
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Polymers of the natural amylopectin are chemically modified by hydroxyethylation at the glucose subunit carbon atoms C2, C3, or C6 (fig. 1). The most important physicochemical characteristics are the molar substitution (mole hydroxyethyl residue per mole glucose subunit), the C2/C6 ratio (pattern of hydroxyethylation at the carbon position C2 and C6), the spectrum of molecular weights, and the mean molecular weight. HES solutions are classified according to the manufactured mean molecular weight into high-molecular-weight (≥ 400 kd), medium-molecular-weight (200–400 kd), and low-molecular-weight solutions (< 200 kd) according to the molar substitution into highly substituted (hetastarch; 0.62–0.75), medium-substituted (pentastarch; 0.5), and the new generation of low-substituted solutions (tetrastarch; 0.4), and according to the C2/C6 ratio into solutions with a high C2/C6 ratio (> 8) or a low C2/C6 ratio (< 8). HESs are polydisperse solutions of molecules with a broad range of molecular weights. After intravenous infusion, the low-molecular-weight fraction is rapidly lost by renal elimination, and the larger molecules are progressively hydrolyzed by serum α-amylase, resulting in a narrow distribution of molecular weights of a mean in vivo molecular weight that is lower than the mean molecular weight of the infused fluid.1 α-Amylase, an endo-amylase, cleaves within the polyglucose chain and not glucose-by-glucose from the ends. The resulting smaller HES fragments will be further excreted via urine. A minor proportion is transiently stored in tissues and ultimately excreted after redistribution. Especially molar substitution and C2/C6 ratio determine the in vivo behavior of specific HES types and the rate of HES degradation.1–6 Plasma clearance of tetrastarch is at least 20 times higher than that of hetastarch and pentastarch.6 Pharmacodynamics regarding volume efficacy are strikingly dependent on the in vivo mean molecular weight and the colloid osmotic pressure.6 Similarly, adverse effects on hemostasis are determined by the in vivo degradation of a particular HES preparation. Although methods for determination of the in vivo mean molecular weight have already been validated (low-angle laser light scattering, high-performance liquid chromatography), this clinically relevant information is still lacking in current product information of older HES solutions. Against this background, HES products will be grouped into slowly degradable and rapidly degradable compounds in this review as a surrogate parameter for the in vivo mean molecular weight. High-molecular-weight HES and medium-molecular-weight HES with a high molar substitution are classified as slowly degradable HES; medium-molecular-weight HES with a low molar substitution and low-molecular-weight HES are classified as rapidly degradable HES (table 1). In Europe, a large variety of HES products are commercially available but are dominated by rapidly degradable HES preparations, whereas slowly degradable HES preparations are mainly available in the United States (table 1). Solvents for HES molecules are either saline-based or buffered, balanced electrolyte formulations. Most 6% solutions have a volume expansion of approximately 100%, whereas 10% solutions have an expansion of 130–145% due to the movement of water from the interstitial to the intravascular space. However, statements on volume effects are valid only for selected clinical situations with defined volume status at onset, infusion time, speed, and volumes applied.
Maximum daily doses of HES solutions have been recommended to prevent potential side effects. Recent developments center around designing new starch molecules (by modulating molar substitution, molecular weight, and C2/C6 ratio) that not only increase colloid osmotic pressure but also do not interfere with renal function, splanchnic perfusion, reticular endothelial system function, and inflammatory response and do not induce pruritus after long-term and repeated infusion, e.g., in the treatment of stroke, sudden hearing loss, and intensive care patients. Other adverse effects, such as anaphylactoid reaction, are not an issue of major clinical relevance because antigenicity is lowest for HES when compared with gelatin, dextran, and albumin.7,8
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Effect of HES on Coagulation Factor VIII and von Willebrand Factor

Fig. 2
Fig. 2
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Acquired von Willebrand syndrome and the decreasing effect on factor VIII of slowly degradable HES have been repeatedly observed since the introduction of slowly degradable HES solutions into clinical practice (fig. 2). Treib et al.3,4,9 systematically investigated differences of HES preparations with regard to coagulation. Physicochemical differences have been shown to be important for the factor VIII/von Willebrand factor (vWF)–decreasing properties of particular HES preparations: Slowly degradable HES solutions have been consistently shown to decrease circulating plasma concentrations of coagulation factor VIII and vWF by up to 80% in healthy volunteers10–12 and in patients6,13–16 even when used below the recommended daily amounts of 25–50 ml/kg. The pathophysiologic consequence of the decrease in factor VIII and vWF is an impairment of functional parameters such as ristocetin cofactor activity or activated partial thromboplastin time.14
In contrast to slowly degradable HES, rapidly degradable HES solutions had no effects in orthopedic patients, in patients with cerebrovascular disease after chronic administration, and in volunteers6,11,16 Recent trials reported the use of high tetrastarch doses of up to 50–70 ml/kg without deterioration of VIII.17,18 In parallel to the lower in vivo molecular weight of tetrastarch, factor VIII and vWF returned to almost normal up to 5 h postoperatively, but not in hetastarch-treated orthopedic patients.6 There is a physiologic increase in acute phase parameters such as coagulation factor VIII and vWF in the postoperative period starting at the time of arrival in the recovery room,13 which plays a role in the postoperative hypercoagulability. Slowly degradable HES15,19 but not rapidly degradable HES diminished the postoperative increase in factor VIII and vWF.20,21
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The pathogenetic mechanism responsible for the adverse effects on plasmatic coagulation is not yet understood. Although passive hemodilutional effects are observed immediately after infusion (such as the decrease in hemoglobin and fibrinogen concentration), vWF reaches its minimum 1–2 h afterward and exceeds the degree of decrease (20% vs. 47%) indicating additional mechanisms responsible for the decrease beyond the dilutional effect.11 Nondilutional mechanisms, however, remain hypothetical. While each in vivo study found a decrease in factor VIII (although the decrease did not reach statistical significance in some studies19,22), in vitro studies did not reproduce the decreasing effect of HES on factor VIII (except for one recent experimental study23). This result may indicate the absence or blockade of the pathogenic mechanism in the in vitro testing milieu.
A decreased release is unlikely considering the half-life of vWF of 8 h. Antibody-mediated mechanisms also seem to be unlikely because of the rare occurrence of preformed HES antibodies.8 Increased proteolytic degradation is unlikely because both small and large vWF multimers decrease similarly after HES infusion.3 Association of vWF with collagen has been suggested to regulate GP Ib binding function. Similarly, association with larger HES molecules may occur, and accelerated elimination after complexing has been considered as a pathogenic mechanism responsible for the adverse effect on factor VIII/vWF complex. In this context, it remains to be determined whether its association with HES molecules modulates vWF function and whether the interaction of vWF with platelet receptors blocked by HES molecules modulates vWF-cleaving protease secretion or activity.
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Effect of HES on Platelet Function

While focusing on the decrease in factor VIII and vWF, side effects of HES on platelet function have remained a blind spot until recently. Although the decrease in platelet volume observed after HES hemodilution5 does not allow conclusions to be drawn about platelet function, the introduction of near-patient coagulation monitoring such as platelet function analyzer PFA-100 and thrombelastography and novel platelet testing techniques such as whole blood flow cytometry advanced our understanding of HES-dependent platelet effects. Similar to the plasmatic coagulation changes, physicochemical differences were found to be important for the platelet-inhibiting properties of particular HES preparations: Slowly degradable HES solutions have been found to prolong PFA-100 closure times significantly,24,25 whereas rapidly degradable HES had minimal specific effects, if any, in healthy volunteers.24 PFA-100 measures global platelet function that is dependent on the interaction of GP IIb–IIIa and GP Ib with their ligands, such as fibrinogen and vWF. HES-induced prolongations in PFA-100 closure times have been confirmed in the majority of studies,10,24,26 but not in one study in which surgery per se may have counteracted the effect of HES on platelet function.20 Platelet inhibition by HES molecules has been further investigated at the cellular level using flow cytometry, which permits evaluation of surface receptor expression and intracellular messenger status on individual platelets.24,25 Our own recent experiments suggest that not only their physicochemical differences but also the composition of the solvent determines side effects of HES preparations on platelet function: The novel high-molecular-weight HES (670 kd, molar substitution 0.75) exerts platelet-stimulating effects which may be, at least in part, due to the high calcium concentration in the solvent.27
Fitting into the above elaborated picture, rapidly degradable HES did not decrease platelet aggregation,20 whereas slowly degradable HES impaired platelet aggregation.28 The aforementioned effects of HES on hemostasis have been further confirmed in multiple studies using either conventional or platelet inhibitor–modified thrombelastography: Changes in the speed and the quality of clot formation have been documented extensively.11,19,22,29–31 Thrombelastography confirmed that physicochemical characteristics of HES preparations significantly modify their side effects on blood coagulation and on thrombelastographic parameters indicative of platelet function (including angle α, maximum clot firmness, and coagulation time), with slowly degradable HES having the most pronounced effect.11,29,30 Thrombelastometric coagulation analysis, however, proved insensitive to detect the modest impact of molar substitution of two different rapidly degradable HES preparations in in vitro hemodilution.31 The increasing understanding of the crucial importance of the in vivo molecular weight and the specific in vivo pharmacokinetic behavior of a particular HES preparation suggests that some experimental in vitro study designs may be inadequate to detect HES-dependent hemostatic side effects due to altered metabolic degradation and absent elimination in vitro.
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Platelet activation transforms the extracellular portion of platelet membrane GP IIb–IIIa complex into a conformational state that is competent for binding its ligands, such as soluble fibrinogen and vWF. This reaction is a prerequisite for platelet aggregation and irreversible adhesion to the subendothelium (fig. 2). Slowly degradable HES induces cellular abnormalities with a decreased agonist-induced expression and activation of platelet surface GP IIb–IIIa.24,25 Reduced activated GP IIb–IIIa availability in turn leads to impaired platelet adhesion and aggregation and prolongs PFA-100 closure times. Slowly degradable HES molecules seem not to exert their inhibitory effect on platelet function by interfering with intracellular signal transduction because the agonist-induced increase in cytoplasmic calcium, the key second messenger in platelets, was unchanged in the presence of HES.32 Platelet secretion is a downstream platelet function dependent on intracellular calcium. Supporting the independence of platelet-inhibiting HES effects on intracellular signal transduction, platelet secretion assessed by the expression of P-selectin, was not decreased24 or was only slightly decreased33 by slowly degradable HES. Further in vitro experiments investigated unspecific binding of fluorochrome-coupled HES molecules to the platelet surface as another potential mechanism of HES-induced platelet inhibition.34 These flow cytometric experiments visualized extracellular coating of human platelets by HES macromolecules as proposed by early studies. HES may inhibit platelet reactivity by blocking the access of ligands to surface receptors (fig. 2) or by an unspecific modification of cytoplasmic membrane structures, and a consecutive inhibition of the conformational change of GP IIb–IIIa. It remains to be determined whether extracellular coating impairs platelet procoagulant activity by modifying the binding of constituents of the prothrombinase and tenase complex to the negatively charged phospholipids exposed on activated platelets.
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The effect of colloids on fibrinolysis has been discussed controversially. Some studies showed increased fibrinolysis in vivo and in vitro in the presence of HES,29,30,35 whereas others found no effect.12,14,28 Although a definite conclusion cannot be drawn from the available data, the effect of HES on fibrinolysis seems not to be of predominant clinical importance.
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Fibrin Formation and Fibrin Polymerization

Mild to moderate hemodilution with HES has been reported to accelerate the onset of clotting.11,22 This phenomenon may be an in vitro artifact, or HES may serve as an additional surface able to activate coagulation factors, thus accelerating the conversion of fibrinogen to fibrin. In contrast to crystalloid-induced hypercoagulability, an imbalance between thrombin generation and antithrombin concentration is not suggested to be involved in HES-induced hypercoagulability.22 Polymerization of fibrin monomers is impaired in the presence of HES macromolecules.22,36
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Clinical Aspects: Perioperative Blood Loss

Side effects of HES on the coagulation system have been accused of worsening clinical outcome.37 A meta-analysis involving 16 trials and 653 randomized patients show a significant higher postoperative bleeding in cardiopulmonary bypass patients exposed to slowly degradable HES than in those exposed to albumin.38 The percentage of patients with excessive bleeding (> 1,000 ml) after cardiopulmonary bypass was significantly higher in the HES group.38 This may increase costs of care because excessive bleeding triggers blood transfusion, prolonged mechanical ventilation, or reexploration for bleeding in many centers.
In contrast to slowly degradable HES, patients receiving rapidly degradable HES were not different with respect to blood loss and transfusion requirements after cardiac, major abdominal, and orthopedic surgery when compared with patients receiving gelatin or albumin.10,18,20,21,29 In trials comparing various HES solution usage, there was a statistically significant difference favoring rapidly degradable HES. Mediastinal drainage was lower in recipients of pentastarch than in recipients of hetastarch.39 Rapidly degradable HES, as compared with hetastarch, reduced the reoperation rate in cardiac surgery patients40 and reduced requirements for transfusion of blood products in orthopedic surgery.16 Decreased interaction with VIII, vWF, and platelet function of rapidly degradable HES might translate to a smaller blood loss.6,31 Even after repetitive large-dose infusion up to 70 ml · kg−1 · d−1 for up to 28 days, blood loss and transfusion of packed erythrocytes were lower in patients treated with rapidly degradable HES.17 The increased therapeutic safety index of the tetrastarch HES 130/0.4 has recently been acknowledged by the European regulatory authorities by increasing the maximum daily dose to 50 ml/kg body weight per day.
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Clinical Aspects: Coagulation Monitoring

A growing body of evidence points to a reduction of transfusion requirements during various surgical settings when coagulation management algorithms are based on point-of-care tests instead of clinician discretion.41 Clinically relevant monitoring options for the detection of side effects of HES on hemostasis include routine coagulation monitoring, such as activated partial thromboplastin time, coagulation factor VIII, and ristocetin cofactor activity, as well as near-patient monitoring, such as thrombelastography and PFA-100. Unfortunately, only the extent of change separates specific HES-dependent effects from dilutional coagulopathy per se, and this differentiation may become infeasible in bleeding patients who require massive transfusion.
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Clinical Aspects: Volume Efficacy

Hydroxyethyl starch solutions are used clinically as plasma expanders to restore and maintain intravascular volume, to stabilize hemodynamic conditions, and to improve tissue perfusion. Before giving recommendations on the use of slowly or rapidly degradable HES types in these specific clinical settings, the question about the extent and duration of their volume efficacy must be addressed. Residual plasma concentrations of slowly degradable HES are higher when compared with rapidly degradable HES.6 Lower plasma concentrations, however, do not mean a lower number of osmotically active particles, because a given weight of HES contains more molecules in the case of lower molecular weight. Rapidly degradable tetrastarch and hetastarch were equally effective volume expanders because colloidal volume requirements for hemodynamic stabilization were similar.6,21,42 Moreover, a recent study in major orthopedic surgery showed not only comparable osmotic pressure values but also a similar duration of volume efficacy of tetrastarch compared with hetastarch despite higher residual plasma concentrations of hetastarch and a higher in vivo molecular weight.16 In volunteers undergoing acute hypovolemia, the volume effect sustained even longer after rapidly degradable tetrastarch than after hetastarch infusion.43 Together, these results show that degradation rate does not correlate with the degree and duration of the volume effect.6 Pharmacodynamics regarding volume effect do not directly mirror HES pharmacokinetics. The plasma concentration half-life of HES must not be interpreted as efficacy half-lives.6
No considerable volume effects have been proven beyond 24 h despite substantial residual plasma concentrations, especially of slowly degradable HES. For maintaining volume expansion at this time point, repetitive doses are required for any HES type. Accumulation and tissue storage of HES molecules exert no therapeutic volume effect but rather induce side effects such as pruritus, organ dysfunctions, and modified inflammatory response. Prolonged persistence of HES in plasma and tissue can be avoided by using rapidly degradable HES types.44
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Practical Recommendations

Rapidly degradable HES seems to be a suitable volume expander in the routine perioperative setting because of the adequate volume efficacy and the low risk of hemostatic derangements. Restrictive use of slowly degradable HES types is recommended whenever hemostatic competence is critical (such as in neurosurgery) and potential bleeding sites are lethally dangerous, in patients with preexisting coagulopathies (such as von Willebrand disease and hemophilia), in an older population with increased susceptibility for HES-induced hemostatic side effects,26 in critically ill patients who require repetitive HES infusions, or in patients with overt bleeding. In this clinical situation, replacement by rapidly degradable HES or by second-line colloidal infusions is recommended,22 and general prothrombotic therapy is indicated. It is important to note that second-line colloidal infusions such as gelatin and dextrans share the same factor VIII– and vWF-decreasing potency and affect platelet function.45,46 Even the natural colloid albumin has been reported to induce platelet dysfunction. Studies comparing the effects of different plasma substitutes (without the new generation of tetrastarch) on coagulation have previously been reviewed:45 The effect of modified gelatin is similar to that of low-molecular-weight HES and albumin. The administration of desmopressin has been reported to reverse the decreasing effect of HES on factor VIII and vWF and to shorten bleeding times.14 Other prothrombotic options for correction of specific hemostatic alterations induced by slowly degradable HES may include the substitution of a factor VIII–vWF concentrate or platelet transfusion that distributes HES macromolecules to an increased pool of platelets.
Hydroxyethyl starch–induced hemostatic changes may be either beneficial or unwanted, depending on the status of a given patient. Attenuation of the postoperative hypercoagulability as a physiologic component of the acute phase reaction after surgery by slowly degradable HES solutions may be beneficial in patients at risk of thrombotic episodes. Long-term repeated infusion of slowly degradable HES e.g., in patients with cerebral perfusion disorders who are at an increased risk of thrombosis may benefit from the HES-induced antithrombotic and platelet-inhibiting effects.
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This article is not intended to discourage the perioperative use of HES solutions, but it should alert clinicians to the potential for hemostatic alterations associated with HES resuscitation. The current data support the recommendation to differentiate between HES specifications and their corresponding pharmacokinetic characteristics. The low-molar substitution is the main determinant of increased metabolic degradation, which determines side effects of particular HES preparations on hemostasis. Slowly degradable HES (high- and medium-molecular-weight hetastarch HES) decrease plasma concentrations of coagulation factor VIII and vWF and impair platelet reactivity by reducing the availability of the platelet fibrinogen receptor glycoprotein IIb–IIIa and by decreasing platelet-linking properties of vWF. Rapidly degradable HES solutions (medium- and low-molecular-weight pentastarch HES and tetrastarch HES) have minimal influence, if any, on hemostasis. Proven volume efficacy and the beneficial risk difference for hemostatic derangements, postoperative blood loss, and reoperation rate favor rapidly degradable HES versus slowly degradable HES.
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American Journal of Veterinary Research
In vitro effect of hydroxyethyl starch 130/0.42 on canine platelet function
Classen, J; Adamik, KN; Weber, K; Rubenbauer, S; Hartmann, K
American Journal of Veterinary Research, 73(): 1908-1912.

Canadian Journal of Anaesthesia-Journal Canadien D Anesthesie
The effect of colloid and crystalloid preloading on thromboelastography prior to Cesarean delivery
Butwick, A; Carvalho, B
Canadian Journal of Anaesthesia-Journal Canadien D Anesthesie, 54(3): 190-195.

Isbt Science Series, Vol 3, No 1
Pharmacologic approach to decreasing transfusion in the perioperative period
Weiskopf, RB
Isbt Science Series, Vol 3, No 1, 3(1): 91-94.

Journal of Veterinary Emergency and Critical Care
The effect of Hetastarch (670/0.75) in vivo on platelet closure time in the dog
Smart, L; Jandrey, KE; Kass, PH; Wierenga, JR; Tablin, F
Journal of Veterinary Emergency and Critical Care, 19(5): 444-449.
Effects of crystalloid and colloid preloads on coagulation assessed by thromboelastography in parturients prior to elective cesarean section
Butwick, AJ; van der Starre, P; Carvalho, B
Anesthesiology, 104(4): B9.

Transfusion Clinique Et Biologique
Blood transfusion and adjunctive therapy in the bleeding trauma patient
Ozier, Y
Transfusion Clinique Et Biologique, 15(5): 240-245.
American Journal of Veterinary Research
In vitro comparison of the effects of two forms of hydroxyethyl starch solutions on platelet function in dogs
Wierenga, JR; Jandrey, KE; Haskins, SC; Tablin, F
American Journal of Veterinary Research, 68(6): 605-609.

Journal of Cardiovascular Surgery
Intraoperative coagulation was more interfered by HES 200/0.5 than normal saline in off-pump coronary artery bypass surgery
Yen, TS; Chan, KC; Cheng, YJ
Journal of Cardiovascular Surgery, 49(5): 679-684.

Acta Neurochirurgica
Hemostatic and hemorrhagic problems in neurosurgical patients
Gerlach, R; Krause, M; Seifert, V; Goerlinger, K
Acta Neurochirurgica, 151(8): 873-900.
Journal of Cardiothoracic and Vascular Anesthesia
A New Plasma-Adapted Hydroxyethyl Starch Preparation: In Vitro Coagulation Studies
Boldt, J; Mengistu, A
Journal of Cardiothoracic and Vascular Anesthesia, 24(3): 394-398.
Vox Sanguinis
The impact of a medium molecular weight, low molar substitution hydroxyethyl starch dissolved in a physiologically balanced electrolyte solution on blood coagulation and platelet function in vitro
Boldt, J; Mengistu, A; Seyfert, UT; Vogt, A; Hellstern, P
Vox Sanguinis, 93(2): 139-144.
Journal of Cardiothoracic and Vascular Anesthesia
Pro: Hydroxyethyl starch is preferable to albumin in the perioperative management of cardiac patients
James, MFM
Journal of Cardiothoracic and Vascular Anesthesia, 22(3): 482-484.
British Journal of Anaesthesia
Influence on coagulation of a potato-derived hydroxethylstarch (HES 130/0.42) and a maize-derived hydroxethylstarch (HES 130/0.4) in patients undergoing cardiac surgery
Boldt, J; Suttner, S; Brosch, C; Lehmann, A; Mengistu, A
British Journal of Anaesthesia, 102(2): 191-197.
Canadian Journal of Anaesthesia-Journal Canadien D Anesthesie
Hydroxyethyl starch 130/0.4 attenuates early hepatic damage in ischemia/reperfusion injury
Catre, D; Viana, JS; Cabrita, AM; Oliveira, M; Felizes, A; Lopes, MF
Canadian Journal of Anaesthesia-Journal Canadien D Anesthesie, 57(5): 439-445.
Notfall & Rettungsmedizin
Volume resuscitation
Jacob, M; Chappell, D
Notfall & Rettungsmedizin, 13(4): 287-293.
Anesthesia and Analgesia
Iatrogenic Hypoalbuminemia Due to Hydroxyethyl Starch 130/0.4: A Risk Factor for Acute Kidney Injury? Response
Boldt, J
Anesthesia and Analgesia, 110(4): 1243.
Notfall & Rettungsmedizin
Interaction between volume therapy and coagulation
Lison, S; Innerhofer, P; Spannagl, M; Heindl, B
Notfall & Rettungsmedizin, 12(3): 176-180.
Anesthesia and Analgesia
Cardiopulmonary Bypass Priming Using a High Dose of a Balanced Hydroxyethyl Starch Versus an Albumin-Based Priming Strategy
Boldt, J; Suttner, S; Brosch, C; Lehmann, A; Rohm, K; Mengistu, A
Anesthesia and Analgesia, 109(6): 1752-1762.
Journal of Cardiothoracic and Vascular Anesthesia
Pro: Use of colloids in cardiac surgery
Boldt, J
Journal of Cardiothoracic and Vascular Anesthesia, 21(3): 453-456.
British Journal of Anaesthesia
Comparison of the effects of gelatin and a modern hydroxyethyl starch solution on renal function and inflammatory response in elderly cardiac surgery patients
Boldt, J; Brosch, C; Rohm, K; Papsdorf, M; Mengistu, A
British Journal of Anaesthesia, 100(4): 457-464.
Journal of Thrombosis and Haemostasis
Fibrinogen substitution improves whole blood clot firmness after dilution with hydroxyethyl starch in bleeding patients undergoing radical cystectomy: a randomized, placebo-controlled clinical trial
Fenger-Eriksen, C; Jensen, TM; Kristensen, BS; Jensen, KM; Tonnesen, E; Ingerslev, J; Sorensen, B
Journal of Thrombosis and Haemostasis, 7(5): 795-802.
Journal of Thrombosis and Haemostasis
Mechanisms of hydroxyethyl starch-induced dilutional coagulopathy
Fenger-Eriksen, C; Tonnesen, E; Ingerslev, J; Sorensen, B
Journal of Thrombosis and Haemostasis, 7(7): 1099-1105.
Anesthesia and Analgesia
Perioperative Crystalloid and Colloid Fluid Management in Children: Where Are We and How Did We Get Here?
Bailey, AG; McNaull, PP; Jooste, E; Tuchman, JB
Anesthesia and Analgesia, 110(2): 375-390.
Anesthesia and Analgesia
The value of an albumin-based intravascular volume replacement strategy in elderly patients undergoing major abdominal surgery
Boldt, J; Scholhorn, T; Mayer, J; Piper, S; Suttner, S
Anesthesia and Analgesia, 103(1): 191-199.
Acquired lysosomal storage caused by frequent plasmapheresis procedures with hydroxyethyl starch
Auwerda, JJA; Leebeek, FWG; Wilson, JHP; van Diggelen, OP; Lam, KH; Sonneveld, P
Transfusion, 46(): 1705-1711.
Journal of Clinical Anesthesia
Hemodynamic effects of 6% and 10% hydroxyethyl starch solutions versus 4% albumin solution in septic patients
Friedman, G; Jankowski, S; Shahla, M; Gomez, J; Vincent, JL
Journal of Clinical Anesthesia, 20(7): 528-533.
European Journal of Haematology
Hydrops lysosomalis generalisatus - an underestimated side effect of hydroxyethyl starch therapy?
Schmidt-Hieber, M; Loddenkemper, C; Schwartz, S; Arntz, G; Thiel, E; Notter, M
European Journal of Haematology, 77(1): 83-85.
Minerva Anestesiologica
Management of massive operative blood loss
Kozek-Langenecker, S
Minerva Anestesiologica, 73(): 401-415.

British Journal of Anaesthesia
Seven misconceptions regarding volume therapy strategies-and their correction
Boldt, J
British Journal of Anaesthesia, 103(2): 147-151.
Journal of Thoracic and Cardiovascular Surgery
Hetastarch increases the risk of bleeding complications in patients after off-pump coronary bypass surgery: A randomized clinical trial
Hecht-Dolnik, M; Barkan, H; Taharka, A; Loftus, J
Journal of Thoracic and Cardiovascular Surgery, 138(3): 703-711.
Anesthesia and Analgesia
The Next Generation of Colloids: Ready for "Prime Time"?
Nussmeier, NA; Searles, BE
Anesthesia and Analgesia, 109(6): 1715-1717.
Transfusion Medicine and Hemotherapy
Thrombelastography Should Be Included in the Algorithm for the Management of Postpartum Hemorrhage
Jambor, C; Kozek-Langenecker, SA; Frietsch, T; Knels, R
Transfusion Medicine and Hemotherapy, 35(5): 391-392.
Intensive Care Medicine
The influence of a balanced volume replacement concept on inflammation, endothelial activation, and kidney integrity in elderly cardiac surgery patients
Boldt, J; Suttner, S; Brosch, C; Lehmann, A; Rohm, K; Mengistu, A
Intensive Care Medicine, 35(3): 462-470.
Critical Care
HES 130/0.4 impairs haemostasis and stimulates pro-inflammatory blood platelet function
Sossdorf, M; Marx, S; Schaarschmidt, B; Otto, GP; Claus, RA; Reinhart, K; Hartog, CS; Losche, W
Critical Care, 13(6): -.
Journal of Pediatrics
Development of Spontaneous Subdural Hematoma and Bone Marrow Depression after Hydroxyethyl Starch Administration
Chappell, D; Bruchelt, W; Schenk, W; Jacob, M; Hofmann-Kiefer, K; Conzen, P; Kreimeier, U; Rehm, M
Journal of Pediatrics, 153(4): 579-581.
Therapeutic options for perioperatively acquired platelet dysfunctions
Weber, CF; Schneider, AC; Kirschning, T; Hofstetter, C; Zacharowski, K; Gorlinger, K
Anaesthesist, 58(9): 931-+.
Guidelines on therapy with blood components and plasma derivatives: human albumin
Boldt, J
Anaesthesist, 59(6): 566-574.
British Journal of Anaesthesia
Molar substitution and C2/C6 ratio of hydroxyethyl starch: influence on blood coagulation
von Roten, I; Madjdpour, C; Frascarolo, P; Burmeister, MA; Fisch, A; Schramm, S; Bombeli, T; Spahn, DR
British Journal of Anaesthesia, 96(4): 455-463.
Anesthesia and Analgesia
Limitations of in vitro experiments on hydroxyethyl starch solutions
Scharbert, G; Kozek-Langenecker, S
Anesthesia and Analgesia, 105(3): 885.
Postoperative blood loss and transfusion associated with use of Hextend in cardiac surgery patients at a blood conservation center
Moskowitz, DM; Shander, A; Javidroozi, M; Klein, JJ; Perelman, SI; Nemeth, J; Ergin, MA
Transfusion, 48(4): 768-775.
Kidney International
Osmotic nephrosis in a renal transplant recipient
Ebcioglu, Z; Cohen, DJ; Crew, RJ; Hardy, MA; Ratner, LE; D'Agati, VD; Markowitz, GS
Kidney International, 70(): 1873-1876.
Comparing the effects of colloids on clot formation
Kozek-Langenecker, S; Scharbert, G
Anaesthesia, 63(6): 673-674.

Journal of Cardiothoracic and Vascular Anesthesia
Con: Starches are not preferable to albumin during cardiac surgery: A contrary opinion
Green, RS; Hall, RI
Journal of Cardiothoracic and Vascular Anesthesia, 22(3): 485-491.
Anesthesia and Analgesia
Modern Rapidly Degradable Hydroxyethyl Starches: Current Concepts
Boldt, J
Anesthesia and Analgesia, 108(5): 1574-1582.
Notfall & Rettungsmedizin
Damage control volume therapy in emergency care
Kreimeier, U; Vincent, JL; Waydhas, C
Notfall & Rettungsmedizin, 12(3): 201-204.
Journal of Anesthesia
Before-after study of a restricted fluid infusion strategy for management of donor hepatectomy for living-donor liver transplantation
Fujita, Y; Takeuchi, A; Sugiura, T; Hattori, T; Sasano, N; Mizuochi, Y; Sobue, K
Journal of Anesthesia, 23(1): 67-74.
Anesthesia and Analgesia
Fibrinogen and bleeding: Old molecule - New ideas
Nielsen, VG; Levy, JH
Anesthesia and Analgesia, 105(4): 902-903.
Anesthesia and Analgesia
The effects of hydroxyethyl starch 130/0.4 (6%) on blood loss and use of blood products in major surgery: A pooled analysis of randomized clinical trials
Kozek-Langenecker, SA; Jungheinrich, C; Sauermann, W; Van der Linden, P
Anesthesia and Analgesia, 107(2): 382-390.
Anesthesia and Analgesia
A new plasma-adapted hydroxyethylstarch preparation: In vitro coagulation studies using thrombelastography and whole blood aggregometry
Boldt, J; Wolf, M; Mengistu, A
Anesthesia and Analgesia, 104(2): 425-430.
Critical Care
Rational fluid management in today's ICU practice
Bartels, K; Thiele, RH; Gan, TJ
Critical Care, 17(): -.
Effect of intraoperative HES 6% 130/0.4 on the need for blood transfusion after major oncologic surgery: a propensity-matched analysis
Zampieri, FG; Ranzani, OT; Morato, PF; Campos, PP; Caruso, P
Clinics, 68(4): 501-509.
Acta Anaesthesiologica Scandinavica
Stroke volume-directed administration of hydroxyethyl starch or Ringer's acetate in sitting position during craniotomy
Lindroos, ACB; Niiya, T; Silvasti-Lundell, M; Randell, T; Hernesniemi, J; Niemi, TT
Acta Anaesthesiologica Scandinavica, 57(6): 729-736.
Journal of Veterinary Emergency and Critical Care
In vitro evaluation of canine hemostasis following dilution with hydroxyethyl starch (130/0.4) via thromboelastometry
Falco, S; Bruno, B; Maurella, C; Bellino, C; D'Angelo, A; Gianella, P; Tarducci, A; Zanatta, R; Borrelli, A
Journal of Veterinary Emergency and Critical Care, 22(6): 640-645.
Influence of Different Strategies of Volume Replacement on the Activity of Matrix Metalloproteinases: An In Vitro and In Vivo Study
Volta, CA; Alvisi, V; Campi, M; Marangoni, E; Alvisi, R; Castellazzi, M; Fainardi, E; Manfrinato, MC; Dallocchio, F; Bellini, T
Anesthesiology, 106(1): 85-91.

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Reinhart, K; Hartog, CS; Brunkhorst, FM
Anesthesiology, 112(3): 756-757.
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Comment on Reference to Maximum Dose for Starch
Bennett-Guerrero, E; Gan, TJ; Roche, AM; Mythen, MG
Anesthesiology, 112(3): 757-758.
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Bring Rapidly Degradable Hydroxyethyl Starch to the United States
Tang, JF; Pittet, J; Ganter, MT
Anesthesiology, 104(5): 1105-1106.

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Barklin, A; Tønnesen, E; Ingerslev, J; Sørensen, B; Fenger-Eriksen, C
Anesthesiology, 110(6): 1287-1292.
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Anesthesiology, 111(1): 187-202.
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Impact of the C2/C6 Ratio of High-molecular-weight Hydroxyethyl Starch on Pharmacokinetics and Blood Coagulation in Pigs
Schramm, S; Thyes, C; Frascarolo, P; Buclin, T; Burki, M; Fisch, A; Burmeister, M; Asmis, L; Spahn, DR
Anesthesiology, 107(3): 442-451.
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A Rational Approach to Perioperative Fluid Management
Chappell, D; Jacob, M; Hofmann-Kiefer, K; Conzen, P; Rehm, M
Anesthesiology, 109(4): 723-740.
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Effect of High- and Low-molecular-weight Low-substituted Hydroxyethyl Starch on Blood Coagulation during Acute Normovolemic Hemodilution in Pigs
Thyes, C; Madjdpour, C; Frascarolo, P; Buclin, T; Bürki, M; Fisch, A; Burmeister, M; Asmis, L; Spahn, DR
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Critical Care Medicine
Perioperative volume replacement in children undergoing cardiac surgery: Albumin versus hydroxyethyl starch 130/0.4*
Hanart, C; Khalife, M; De Villé, A; Otte, F; De Hert, S; Van der Linden, P
Critical Care Medicine, 37(2): 696-701.
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Critical Care Medicine
Hydroxyethyl starch 130/0.4: Safe in cardiac surgery?
Boldt, J
Critical Care Medicine, 36(5): 1696.
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Is the use of colloids for fluid replacement harmless in children?
Saudan, S
Current Opinion in Anesthesiology, 23(3): 363-367.
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The role of tetrastarches for volume replacement in the perioperative setting
James, MF
Current Opinion in Anesthesiology, 21(5): 674-678.
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Saline versus balanced hydroxyethyl starch: does it matter?
Boldt, J
Current Opinion in Anesthesiology, 21(5): 679-683.
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Advances in anesthesia and organ transplantation: pearls of wisdom from the pioneers
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Current Opinion in Organ Transplantation, 12(3): 271-273.
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Anesthesia and outcome after partial hepatectomy for adult-to-adult donor transplantation
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Current Opinion in Organ Transplantation, 15(3): 377-382.
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Safety of nonblood plasma substitutes: less frequently discussed issues
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