Recombinant platelet factor 4 for heparin neutralization.

Abstract:

:Protamine sulfate has been used for many years to reverse the effects of unfractionated heparin, but it can cause hemodynamic changes and other serious side effects. Platelet factor 4 (PF4) is a naturally occurring protein synthesized in megakaryocytes and eventually stored in the alpha granules of platelets for later release. Although the complete physiologic role of PF4 is unknown, it is highly effective for the neutralization of heparin anticoagulation. Several preliminary animal studies and trials using blood obtained from cardiopulmonary bypass circuits suggested recombinant PF4 (rPF4) would be an effective alternative to protamine. In the first open-label, phase 1 human study, patients received rPF4 in doses of 0.5, 1.0, 2.5, or 5.0 mg/kg over 3 minutes to reverse heparin anticoagulation after diagnostic cardiac catheterization. There were no important hemodynamic changes and the rPF4 was highly effective in neutralizing heparin. Serial measurements of rPF4 levels showed a monophasic elimination pattern with a serum half-life of 25.5 +/- 13.5 minutes that was independent of dose administered. A randomized and blinded trial comparing rPF4 to protamine confirmed the safety and effectiveness of rPF4. Although rPF4 was initially being evaluated as a clinical alternative to protamine, it is not currently being developed for general clinical use.

journal_name

Semin Thromb Hemost

authors

Mixon TA,Dehmer GJ

doi

10.1055/s-2004-831050

subject

Has Abstract

pub_date

2004-06-01 00:00:00

pages

369-77

issue

3

eissn

0094-6176

issn

1098-9064

journal_volume

30

pub_type

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