title: Heparin rebound: a comparative study of protamine chloride and protamine sulfate in patients undergoing coronary artery bypass surgery.
abstract: Heparin rebound has been suggested to occur when protamine sulfate, but not protamine chloride, is used to neutralize heparin. This study was undertaken to compare these two protamine salts in 32 patients undergoing coronary artery bypass surgery. Initial heparin and subsequent protamine doses were determined by constructing a heparin-activated coagulation time response curve. Heparin was neutralized either with protamine sulfate or protamine chloride. The total protamine/heparin dose ratio was 0.71 +/- 0.05 for protamine sulfate and 0.77 +/- 0.07 (mg/100 U) for protamine chloride. The initial neutralization effect, the subsequent behavior of the plasma heparin level, and the various coagulation parameters did not differ significantly between the groups. Two hours after neutralization, a small and temporary increase of plasma heparin level was observed in both groups. The postoperative blood losses were comparable in both groups. Thus, protamine chloride was not a clinically superior antidote to heparin than protamine sulfate. The observed heparin rebound levels were low and clinically insignificant in terms of blood loss, but they were associated with slight changes in coagulation monitoring.
authors.affiliation: Department of Anesthesiology, Helsinki University Central Hospital, Finland.
authors.forename: A H
authors.initials: AH
authors.lastname: Kuitunen
authors.forename: M T
authors.initials: MT
authors.lastname: Salmenperä
authors.forename: J
authors.initials: J
authors.lastname: Heinonen
authors.forename: V P
authors.initials: VP
authors.lastname: Rasi
authors.forename: G
authors.initials: G
authors.lastname: Myllylä
mesh_terms: D001777:Blood Coagulation / Q000187:drug effects; D001778:Blood Coagulation Disorders / Q000517:prevention & control*; D016063:Blood Loss, Surgical; D001026:Coronary Artery Bypass; D004305:Dose-Response Relationship, Drug; D004311:Double-Blind Method; D005260:Female; D006324:Heart Arrest, Induced; D006493:Heparin / Q000008:administration & dosage / Q000097:blood*; D006801:Humans; D008297:Male; D008875:Middle Aged; D011479:Protamines / Q000008:administration & dosage / Q000627:therapeutic use*; D013997:Time Factors
chemical_list: D011479:Protamines; D006493:Heparin