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British Journal of Anaesthesia, Vol 84, Issue 3 403-404, Copyright © 2000 by Oxford University Press

ARTICLES

Preparation for regional anaesthesia induces changes in thrombelastography

H Gorton, G Lyons and P Manraj
St James' University Hospital, Leeds, UK.

The effects of crystalloid and colloid infusions on coagulation measured by thrombelastography (TEG) present a confused picture. The influence of environmental factors may explain the disparity between previous studies. We studied two groups of 20 women presenting at term for elective Caesarean section. In the first group, TEG analysis was performed before and after infusion of Gelofusine 500 ml over 15 min. The second group was treated in the same way except that subjects did not receive fluid. We found significant changes in r and k values in both groups, suggesting enhanced coagulation. As hypercoagulable changes were also seen in the group that did not receive fluid preload, the hypothesis that moderate haemodilution causes hypercoagulability must be questioned. The influence of environmental factors can explain differences reported between in vivo and in vitro studies.
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