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An analysis of mechanisms underlying the antifibrinolytic properties of radiographic contrast agents.

Abstract：

BACKGROUND:Radiographic contrast agents inhibit fibrinolysis, although by poorly defined pathways. The purpose of this study was to define specific mechanisms by which contrast agents inhibit clot lysis. METHODS AND RESULTS:Diatrizoate (high osmolar ionic agent), ioxaglate (low osmolar ionic), and ioversol (nonionic) were studied in vitro. Diatrizoate inhibited clot lysis by 81.3+/-0.6% vs. control (p<0.001). Ioxaglate inhibited clot lysis by 41.7+/-11.9%, which was of borderline significance (p=0.07). Ioversol did not significantly inhibit clot lysis (14.9+/-11.5% decrease vs. control; p>0.3). Inhibition of fibrinolysis was not explained by the high osmolarities of contrast agents, by their iodine content, or by their effects on the amidolytic activities of t-PA, urokinase, or plasmin. However, plasminogen activation by t-PA, urokinase, or streptokinase was significantly inhibited by contrast agents. Diatrizoate, ioxaglate, and ioversol inhibited plasminogen binding to plasma clots by 51+/-4% (p<0.001), 30.1+/-4% (p<0.01), and 19.4+/-7% (p=0.07), respectively. Plasma clots formed in the presence of contrast agents were resistant to lysis by plasmin. Diatrizoate produced the most potent effect, inhibiting clot lysis by 40+/-5.7% (p<0.03). Contrast agents did not inhibit plasminogen binding to fibrin or plasmin-mediated fibrinolysis if they were added after clot formation. Contrast agents altered clot turbidity, an index of fibrin structure, if present during clot formation, but not if added to preformed clots. Contrast agents did not affect plasminogen activator inhibitor-1 or alpha(2)-antiplasmin function. CONCLUSIONS:Contrast agents inhibit clot lysis by inhibiting plasminogen activation and by disrupting interactions of plasminogen and plasmin with fibrin by altering fibrin structure. Significant variation in antifibrinolytic properties exists between different contrast agents.

journal_name

J Thromb Thrombolysis

journal_title

Journal of thrombosis and thrombolysis

authors

Farrehi PM,Zhu Y,Fay WP

doi

10.1023/a:1015283210156

subject

Has Abstract

pub_date

2001-12-01 00:00:00

pages

273-81

issue

3

eissn

0929-5305

issn

1573-742X

journal_volume

12

pub_type

杂志文章

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