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(Circulation. 1996;93:667-671.)
© 1996 American Heart Association, Inc.
Articles |
Relation Between Activated Clotting Time During Angioplasty and Abrupt Closure
From the Division of Cardiology, Department of Medicine, Duke University Medical Center, Durham, NC.
Correspondence to Robert M. Califf, MD, Duke University Medical Center, Box 31123, Durham, NC 27710. E-mail calif001@mc.duke.edu.
Background The purpose of this study was to determine whether the degree of heparin anticoagulation during coronary angioplasty, as measured by the activated clotting time, is related to the risk of abrupt vessel closure.
Methods and Results Sixty-two cases of in- and out-of-laboratory abrupt closure in patients in whom intraprocedure activated clotting times were measured were identified from a population of 1290 consecutive patients who underwent nonemergency coronary angioplasty. This group was compared with a matched control population of 124 patients who did not experience abrupt closure. Relative to the control population, patients who experienced abrupt closure had significantly lower initial (median, 350 seconds [25th to 75th percentile, 309 to 401 seconds] versus 380 seconds [335 to 423 seconds], P=.004) and minimum (345 seconds [287 to 387 seconds] versus 370 seconds [321 to 417 seconds], P=.014) activated clotting times. Higher activated clotting times were not associated with an increased likelihood of major bleeding complications. Within this population, a strong inverse linear relation existed between the activated clotting time and the probability of abrupt closure.
Conclusions This study demonstrates a significant inverse relation between the degree of anticoagulation during angioplasty and the risk of abrupt closure. A minimum target activated clotting time could not be identified; rather, the higher the intensity of anticoagulation, the lower the risk of abrupt closure.
Key Words: angioplasty • complications • heparin • anticoagulants
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