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Anesth Analg 1999;89:580
© 1999 International Anesthesia Research Society


CARDIOVASCULAR ANESTHESIA

Use of abciximab-Modified Thrombelastography in Patients Undergoing Cardiac Surgery

S. C. Kettner, MD*,{ddagger}, O. P. Panzer, MD*, S. A. Kozek, MD*, F. A. Seibt, MD*,{ddagger}, B. Stoiser, MD{dagger}, J. Kofler, MD{dagger}, G. J. Locker, MD{dagger}, and M. Zimpfer, MD*,{ddagger}

*Department of Anesthesiology and General Intensive Care and the {dagger}Department of Internal Medicine I, University of Vienna, General Hospital Vienna; and {ddagger}Ludwig Boltzmann Institute of Clinical Anesthesiology and Intensive Care, Vienna, Austria

Address correspondence and reprint requests to Stephan C. Kettner, MD, Department of Anesthesiology and General Intensive Care, General Hospital Vienna, 18-20 Währinger Gürtel, A-1090 Vienna, Austria. Address e-mail to stephan.kettner{at}akh-wien.ac.at

Thrombelastography (TEG) is a reliable coagulation monitoring system that can guide blood product transfusion in cardiac surgery. The maximum amplitude (MA) of TEG measures clot strength, which is dependent on both fibrinogen level and platelet function. Inhibition of platelet function with abciximab-fab is suggested to permit quantitative assessment of the contribution of fibrinogen to clot strength. We hypothesized that abciximab-modified TEG permits prediction of plasma fibrinogen levels and that the difference of standard MA and abciximab-modified MA ({Delta}MA) is a correlate for platelet function. We correlated abciximab-modified MA with plasma fibrinogen levels and {Delta}MA with platelet count in patients undergoing coronary revascularization. Correlation between plasma fibrinogen levels and abciximab-modified MA was significant (adjusted r2: 0.8; P < 0.0001). Correlation of {Delta}MA with platelet count was not significant when calculated in millimeters (adjusted r2: 0.04; P = 0.73). However, when {Delta}MA was calculated in dynes per square centimeter ({Delta}GMA), it correlated significantly with platelet count (adjusted r2: 0.51;

P < 0.0001). We conclude that abciximab-modified TEG may therefore help to discriminate between hypofibrinogenemia and platelet dysfunction as a cause of decreased MA.

Implications: We examined the use of abciximab-modified thrombelastography in patients undergoing cardiac surgery. Modification of thrombelastography with abciximab-fab allows prediction of fibrinogen levels, despite coagulation altered by cardiac surgery. The difference of standard maximum amplitude and abciximab-modified maximum amplitude correlates with platelet function when expressed in dynes per square centimeter.




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Lippincott, Williams & Wilkins Anesthesia & Analgesia® is published for the International Anesthesia Research Society® by Lippincott Williams & Wilkins and Stanford University Libraries' HighWire Press®. Copyright 1999 by the International Anesthesia Research Society. Online ISSN: 1526-7598   Print ISSN: 0003-2999 HighWire Press
Copyright © 1999 by the International Anesthesia Research Society.