(Circulation. 2001;103:658.)
© 2001 American Heart Association, Inc.
Clinical Investigation and Reports |
From the Department of Cardiology and the Hemostasis Laboratory (A.A.), Pitié-Salpêtrière University Hospital, Paris, France.
Correspondence to Dr G. Montalescot, Department of Cardiology, Pitié-Salpêtrière University Hospital, 47 Boulevard de lHôpital, 75013 Paris, France. E-mail gilles.montalescot{at}psl.ap-hop-paris.fr
BackgroundSubcutaneous low-molecular-weight (LMW) heparins can effectively replace unfractionated heparin in patients with unstable angina or nonQ-wave myocardial infarction. However, the optimal anticoagulation strategy for these patients when they require cardiac catheterization is still unclear. Therefore, we evaluated a new and simple strategy of anticoagulation in these patients.
Methods and ResultsA total of 451 consecutive patients with unstable angina/nonQ-wave myocardial infarction were treated for at least 48 hours with subcutaneous injections of enoxaparin (1 mg [100 IU]/kg every 12 hours, cycled at 6 AM and 6 PM). Of this unselected population, 293 patients (65%) underwent a coronary angiography within 8 hours of the morning LMW heparin injection, followed by immediate percutaneous coronary intervention (PCI) in 132 patients (28%). PCI was performed without any additional bolus of unfractionated/LMW heparin and without coagulation monitoring. Anti-Xa activity at the time of catheterization was 0.98±0.03 IU/mL, was >0.5 IU/mL in 97.6% of patients, and did not relate to the LMW heparin injection-to-catheterization time. There were no in-hospital abrupt closures or urgent revascularizations after PCI. The death/myocardial infarction rate at 30 days was 3.0% in the PCI group (n=132) but 6.2% in the whole population (n=451) and 10.8% in the patients not undergoing catheterization (n=158). The 30-day major bleeding rate was 0.8% in the PCI group, which was comparable to that of patients without catheterization (1.3%).
ConclusionsPCI within 8 hours of the last enoxaparin subcutaneous injection seems to be safe and effective. The safety of subcutaneous LMW heparin in combination with platelet glycoprotein IIb/IIIa blockade awaits further study.
Key Words: coronary disease angioplasty anticoagulants coagulation pharmacology
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