An in vivo model for the assessment of acute fibrinolytic capacity of the endothelium

David E Newby, R Wright, C. A. Ludlam, K. A. Fox, N. A. Boon, David J Webb

Research output: Contribution to journalArticlepeer-review

Abstract / Description of output

The effects on blood flow and plasma fibrinolytic and coagulation parameters of intraarterial substance P, an endothelium dependent vasodilator, and sodium nitroprusside, a control endothelium independent vasodilator, were studied in the human forearm circulation. At subsystemic locally active doses, both substance P (2-8 pmol/min) and sodium nitroprusside (2-8 microg/min) caused dose-dependent vasodilatation (p <0.001 for both) without affecting plasma concentrations of PAI-1, von Willebrand factor antigen or factor VIII:C activity. Substance P caused local increases in t-PA antigen and activity (p <0.001) in the infused arm while sodium nitroprusside did not. At higher doses, substance P increased blood flow and t-PA concentrations in the noninfused arm. We conclude that brief, locally active and subsystemic infusions of intraarterial substance P cause a rapid and substantial local release of t-PA which appear to act via a flow and nitric oxide independent mechanism. This model should provide a useful and selective method of assessing the in vivo capacity of the forearm endothelium to release t-PA acutely.
Original languageEnglish
Pages (from-to)1242-8
JournalThrombosis and Haemostasis
Issue number4
Publication statusPublished - 1 Oct 1997


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