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Optimal Heparin Dosing Regimens for Cardiopulmonary Bypass (Heparin Dosing)

This study has been completed.
ClinicalTrials.gov Identifier:
First Posted: January 7, 2008
Last Update Posted: October 15, 2009
The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Read our disclaimer for details.
Information provided by:
Mayo Clinic
Study has been completed and is in the data analysis and manuscript writing phase of the project.

Condition Intervention Phase
Postoperative Hemorrhage Drug: Heparin Drug: HH or high heparin Drug: heparin concentration HC Phase 3

Study Type: Interventional
Study Design: Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: Triple (Participant, Care Provider, Outcomes Assessor)
Primary Purpose: Treatment
Official Title: Optimal Heparin Dosing Regimens for Cardiopulmonary Bypass

Resource links provided by NLM:

Further study details as provided by Mayo Clinic:

Primary Outcome Measures:
  • measure blood loss [ Time Frame: within 48 hours ]

Secondary Outcome Measures:
  • transfusion requirements [ Time Frame: 48 hours ]

Enrollment: 270
Study Start Date: June 2001
Study Completion Date: October 2007
Primary Completion Date: October 2007 (Final data collection date for primary outcome measure)
Arms Assigned Interventions
control standard dose heparin dose
Drug: Heparin
300u/kg of heparin for CPB ACT performed. If ACT is < 480 seconds a bolus of 5000u heparin will be given. ACT will be repeated and bolus given until ACT is>480 seconds
Active Comparator: 2
high dose heparin dose
Drug: HH or high heparin
initial dose of 450u/kg for CPB ACT performed additional bolus given if result is <600 seconds anytime during CPB
Active Comparator: 3
hepcon guided therapy
Drug: heparin concentration HC

will have anticoagulation during CPB assessed with heparin concentration monitoring and heparin dose response (HDR) to determine the optimal dosage of heparin. This group will evaluate the possible benefit of the HDR to determine heparin dosing and monitoring to achieve maximal suppression of thrombin compared to a fixed dose of heparin as the other two groups. Additional heparin doses will be given to maintain a specific heparin concentration according to the HDR. This is a recognized way of managing heparin dosing and anticoagulation for CPB.

All three groups will have heparin neutralized by protamine. Adequacy of heparin neutralization will be based on a difference between the ACT and heparinase-treated ACT values of less than 10%


Information from the National Library of Medicine

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Ages Eligible for Study:   18 Years to 90 Years   (Adult, Senior)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No

Inclusion Criteria:

  • Adult male and non-pregnant female patients scheduled for elective cardiac surgery requiring CPB will be eligible for enrollment.

Exclusion Criteria:

  • Age less than 18 or greater than 90 years; emergency surgery
  • Circulatory arrest
  • Combined non-cardiac procedures such as carotid endarterectomy
  • Congenital heart repair
  • Off-CPB coronary artery bypass grafting (CABG)
  • Clotting disorder
  • Fibrinolytic agents (e.g. streptokinase), severe hepatic disease
  • Aprotinin use
  • Cooling < 28 degrees C during CPB
  • Dialysis dependent renal failure; and
  • Platelet receptor GP3a/2b antagonists medication received within 48 hours of surgery. Patients that are not receiving tranexamic acid (TA) intraoperatively will be excluded.
  Contacts and Locations
Information from the National Library of Medicine

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.

Please refer to this study by its ClinicalTrials.gov identifier (NCT number): NCT00587444

United States, Minnesota
Mayo Clinic
Rochester, Minnesota, United States, 55901
Sponsors and Collaborators
Mayo Clinic
Principal Investigator: William Oliver, MD Mayo Clinic
  More Information

Responsible Party: Dr. William Oliver, Mayo Clinic
ClinicalTrials.gov Identifier: NCT00587444     History of Changes
Other Study ID Numbers: 330-01
First Submitted: December 21, 2007
First Posted: January 7, 2008
Last Update Posted: October 15, 2009
Last Verified: October 2009

Keywords provided by Mayo Clinic:
heparin management

Additional relevant MeSH terms:
Postoperative Hemorrhage
Pathologic Processes
Postoperative Complications
Calcium heparin
Fibrinolytic Agents
Fibrin Modulating Agents
Molecular Mechanisms of Pharmacological Action