High-molecular-weight hydroxyethyl starch accelerates kallikrein-dependent clot initiation

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

BACKGROUND: A decrease in reaction time (R; seconds) has been considered a thrombelastographic hallmark of hypercoagulability. However, the cause of changes in R has been influenced by the method of activation (e.g., celite) and the clinical/laboratory setting (e.g., hemodilution). Although antithrombin deficiency has been implicated as a cause of decreased R in unactivated samples after crystalloid dilution, dilution with hydroxyethyl starch (HES) solutions such as Hextend (6% HES solution; average molecular weight 450 kDa) or Voluven (6% HES solution; average molecular weight 130 kDa) has decreased R values in celite-activated samples in vitro and in vivo, with modulation of these R values observed after aprotinin exposure. Thus, this study proposed to define whether HES affects kallikrein-dependent clot initiation. METHODS: Citrated human plasma was subjected to 0% or 30% dilution with 0.9% NaCl, Hextend, or Voluven, in the absence or presence of aprotinin (200 KIU/mL final concentration). Prekallikrein-deficient (<1% activity) plasma was similarly diluted. After recalcification and celite activation, thrombelastography was performed for determination of R. RESULTS AND CONCLUSIONS: R in samples without aprotinin diluted with Hextend (mean ± SD, 132 ± 6 seconds) was significantly smaller than that in samples with 0% dilution (155 ± 5 seconds) and 30% dilution with 0.9% NaCl (162 ± 9 seconds), but was not less than that in Voluven-diluted samples (149 ± 14 seconds). R significantly increased (28%-68%) in all conditions with aprotinin compared to samples without aprotinin, and Hextend had significantly smaller R compared with that in the other fluids. Lastly, R was not different in experiments with prekallikrein-deficient plasma. These data indicate that Hextend accelerates kallikrein-dependent clot initiation compared with 0.9% NaCl or Voluven.

Original languageEnglish (US)
Pages (from-to)1491-1494
Number of pages4
JournalJournal of Trauma
Volume62
Issue number6
DOIs
StatePublished - Jun 2007
Externally publishedYes

Fingerprint

Kallikreins
Aprotinin
Starch
Diatomaceous Earth
Molecular Weight
Prekallikrein
Thrombelastography
Hemodilution
Thrombophilia
Antithrombins
HES 130-0.4

Keywords

  • Coagulation
  • Hemodilution
  • Hydroxyethyl starch
  • Kallikrein
  • Monitoring
  • Thrombelastography

ASJC Scopus subject areas

  • Surgery

Cite this

High-molecular-weight hydroxyethyl starch accelerates kallikrein-dependent clot initiation. / Nielsen, Vance G.

In: Journal of Trauma, Vol. 62, No. 6, 06.2007, p. 1491-1494.

Research output: Contribution to journalArticle

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abstract = "BACKGROUND: A decrease in reaction time (R; seconds) has been considered a thrombelastographic hallmark of hypercoagulability. However, the cause of changes in R has been influenced by the method of activation (e.g., celite) and the clinical/laboratory setting (e.g., hemodilution). Although antithrombin deficiency has been implicated as a cause of decreased R in unactivated samples after crystalloid dilution, dilution with hydroxyethyl starch (HES) solutions such as Hextend (6{\%} HES solution; average molecular weight 450 kDa) or Voluven (6{\%} HES solution; average molecular weight 130 kDa) has decreased R values in celite-activated samples in vitro and in vivo, with modulation of these R values observed after aprotinin exposure. Thus, this study proposed to define whether HES affects kallikrein-dependent clot initiation. METHODS: Citrated human plasma was subjected to 0{\%} or 30{\%} dilution with 0.9{\%} NaCl, Hextend, or Voluven, in the absence or presence of aprotinin (200 KIU/mL final concentration). Prekallikrein-deficient (<1{\%} activity) plasma was similarly diluted. After recalcification and celite activation, thrombelastography was performed for determination of R. RESULTS AND CONCLUSIONS: R in samples without aprotinin diluted with Hextend (mean ± SD, 132 ± 6 seconds) was significantly smaller than that in samples with 0{\%} dilution (155 ± 5 seconds) and 30{\%} dilution with 0.9{\%} NaCl (162 ± 9 seconds), but was not less than that in Voluven-diluted samples (149 ± 14 seconds). R significantly increased (28{\%}-68{\%}) in all conditions with aprotinin compared to samples without aprotinin, and Hextend had significantly smaller R compared with that in the other fluids. Lastly, R was not different in experiments with prekallikrein-deficient plasma. These data indicate that Hextend accelerates kallikrein-dependent clot initiation compared with 0.9{\%} NaCl or Voluven.",
keywords = "Coagulation, Hemodilution, Hydroxyethyl starch, Kallikrein, Monitoring, Thrombelastography",
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