Key result
High-dose protamine increases bleeding and impairs platelet function at a protamine-to-heparin ratio above 2.6.
Why the study?
Whether high doses of protamine cause increased bleeding in patients post cardiac surgery was uncertain.
Does high doses of protamine cause increased bleeding in patients post cardiac surgery?
Does high doses of protamine cause increased bleeding in patients post cardiac surgery?
In post-cardiac surgery patients, high doses of protamine (ratio >2.6:1 to heparin) are associated with increased bleeding and impaired platelet function.
Target protamine-heparin ratios ≤2.6:1 after cardiac surgery to limit bleeding risk; confirms dose-dependent platelet effects without demonstrated harm below this threshold.
A best evidence topic in cardiac surgery was written according to a structured protocol. The question addressed was whether high doses of protamine causes increased bleeding in patients post cardiac surgery. Altogether 268 papers were found using the reported search, of which five presented the best evidence to answer the clinical question. The author, journal, date and country of publication, patient group studied, study type, relevant outcomes, results, and study weaknesses of these papers are tabulated. We conclude that high doses of protamine can cause increased bleeding and impaired platelet function but these effects have never been demonstrated below a ratio of 2.6:1 protamine to heparin.
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Kenneth Edward Mclaughlin (2003) conducted a review in post cardiac surgery. High doses of protamine vs. Lower doses of protamine was evaluated on Increased bleeding and impaired platelet function. High doses of protamine can cause increased bleeding and impaired platelet function, but these effects have not been demonstrated below a 2.6:1 protamine to heparin ratio.
Synapse has enriched 5 closely related papers on similar clinical questions. Consider them for comparative context: