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Relation between activated clotting time during angioplasty and abrupt closure
C R Narins1, W B Hillegass, C L Nelson
1Department of Medicine, Duke University Medical Center, Durham, NC 27710, USA.
Circulation
|February 15, 1996
Summary
Higher heparin anticoagulation, measured by activated clotting time, reduces abrupt vessel closure risk during coronary angioplasty. Increased anticoagulation intensity correlated with lower closure probability without raising bleeding risks.
Area of Science:
- Cardiology
- Interventional Cardiology
- Vascular Medicine
Background:
- Coronary angioplasty carries a risk of abrupt vessel closure.
- Heparin anticoagulation is standard during angioplasty.
- The relationship between anticoagulation intensity and closure risk is not fully understood.
Purpose of the Study:
- To investigate the association between heparin anticoagulation degree and abrupt vessel closure risk.
- To determine if activated clotting time (ACT) predicts closure risk during coronary angioplasty.
Main Methods:
- Retrospective analysis of 1290 patients undergoing non-emergency coronary angioplasty.
- Comparison of 62 patients with abrupt closure to 124 matched controls.
- Measurement of intraprocedure activated clotting times.
Main Results:
- Patients with abrupt closure had significantly lower initial and minimum ACTs compared to controls.
- No increased risk of major bleeding was observed with higher ACTs.
- A strong inverse linear relationship was found between ACT and abrupt closure probability.
Conclusions:
- A higher degree of heparin anticoagulation, indicated by higher ACT, is associated with a lower risk of abrupt vessel closure.
- No specific minimum target ACT was identified; increased anticoagulation intensity consistently reduced risk.
- Optimizing anticoagulation intensity may mitigate closure risk in angioplasty patients.