Thirty-four percent of plasma samples from patients with HIT (88% of those strongly positive) aggregated platelets in the presence of enoxaparin. Patients with HIT may safely receive enoxaparin if their plasma does not aggregate platelets in the presence of enoxaparin.
It is recommended that platelet-rich plasma for platelet aggregation testing be maintained at room temperature and be used between 2 and 4 hours after platelet donation.
The GP IIb/IIIa receptor antagonist, c7E3, inhibits HAAb-induced platelet aggregation via a mechanism that does not appear to interfere with the binding between heparin and HAAb. Clinical trials are warranted to assess whether GP IIb/IIIa antagonists may allow patients with HAAb to safely receive heparin.
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