The Effect of Washing Red Blood Cells on Post Heart Surgery Blood Loss

This study has been completed.
Sponsor:
Information provided by:
University of British Columbia
ClinicalTrials.gov Identifier:
NCT00624611
First received: February 13, 2008
Last updated: April 12, 2011
Last verified: April 2011
  Purpose

When a child undergoes heart surgery, a heart lung machine is used to keep blood flowing while the child's own heart is stopped. After surgery, a significant amount of the child's own blood is left in this machine. In the case of small children, the relative amount of blood potentially lost to the child in this way is very large.

In older children, and those who have undergone less complicated surgery, this blood can all returned to the child. Giving the child back his or her own blood makes is less likely that the child will need a transfusion of donated blood.

However, in younger children, or in children who have undergone more complicated surgery, most or all of this blood is thrown away. This is because of worry that returning this blood may cause bleeding, and excessive bleeding is one of the most feared complications of heart surgery.

This project will explore a method whereby the red blood cells left in the heart lung machine can be returned to children without increasing the risk of bleeding. It will also carefully examine the exact causes of higher bleeding risk in children getting their own blood back so that in the future, all children can have their own blood returned at the end of surgery.


Condition Intervention Phase
Cardiopulmonary Bypass
Procedure: Residual pump blood management post aortic cannula removal
Phase 3

Study Type: Interventional
Study Design: Allocation: Randomized
Endpoint Classification: Efficacy Study
Intervention Model: Single Group Assignment
Masking: Open Label
Primary Purpose: Treatment
Official Title: Post Cardiac Surgery Blood Loss: Effect of Washing Residual Cardiopulmonary Bypass Circuit Blood Red Cells Prior to Re-infusion. A Proof of Concept Study

Resource links provided by NLM:


Further study details as provided by University of British Columbia:

Primary Outcome Measures:
  • Total perioperative blood loss [ Time Frame: During surgery ] [ Designated as safety issue: Yes ]

Secondary Outcome Measures:
  • Components of the hemostatic profile will be compared between groups as secondary outcome variables [ Time Frame: 24 hours ] [ Designated as safety issue: Yes ]

Enrollment: 9
Study Start Date: February 2008
Study Completion Date: August 2010
Primary Completion Date: August 2010 (Final data collection date for primary outcome measure)
Arms Assigned Interventions
Active Comparator: 1
Residual pump blood management post aortic cannula removal
Procedure: Residual pump blood management post aortic cannula removal
Residual pump blood will be maximally hemoconcentrated by further ultrafiltation within the CPB machine. Resulting hematocrit will be approximately 0.4. The total residual pump blood volume, approximately 300ml, will be reinfused over one hour, beginning 15 minutes after removal of the aortic cross clamp. Additional protamine sulfate will be given every 30 minutes during the infusion, .03 mg/ml of residual pump blood. Procedures in this group do not deviate from current standard practice.
Experimental: 2
Residual pump blood management post aortic cannula removal
Procedure: Residual pump blood management post aortic cannula removal
All residual pump blood will be processed with a bedside red cell washing device (Cell Saver). The resulting total volume of concentrated red cells will be infused over one hour, beginning 15 minutes after removal of the aortic cross clamp. Administration of additional protamine is not required due to the low concentrations of heparin in the resulting product.

Detailed Description:

The primary hypothesis of this study is that in our study population, compared to re-infusion of residual CPB blood, re-infusion of only the red cell component of residual CPB blood, causes a lesser defect in clotting, leading to decreased hemorrhage and less post-operative blood loss.

The secondary objectives of this project are to document the effects on the clotting system of pump blood re-infusion by means of in laboratory testing. This work has not been done and is of crucial importance to future optimization of the use of pump blood. We expect to detect and quantify with significant accuracy any increased bleeding risk with our hemostatic profiling. This information will be invaluable in planning the safe introduction of residual CPB blood re-infusion smaller children and those with increase risk of postoperative blood loss. Furthermore, we will determine whether or not any of the potentially beneficial effects to the clotting system of returning all components of residual CPB blood, such as an increase in functioning platelets, or an increase in clotting factors, are realized. This information will determine the utility of pursuing means by which these non red cell components of residual CPB blood can be safely re-infused.

Induction of anesthesia, arterial and venous vascular catheter placement, heparin administration, cardiopulmonary bypass machine setup and priming, conduct of CPB, ultrafiltration of blood during CPB, post-CPB protamine administration and post-CPB blood ultrafiltration will all be standardized as per current clinical practice.

Residual CPB blood will be processed and re-infused according to group allocation.

Intravascular volume in the form of crystalloid, and blood products will be administered over and above the study residual blood product infusion as required according to protocol.

Subjects will have blood sampled for hemoglobin concentration immediately after induction of anesthesia and again 24 hours following their surgery.

Arterial blood will be sampled from the patient for a hemostatic profile, outlined in the adjacent text box, after separation from CPB and prior to initiation of residual CPB blood product re-infusion. A second sample will be obtained when re-infusion of residual CPB blood product is complete. In addition, a hemostatic profile will be run directly on a sample of the residual CPB blood product.

Subject demographic data, surgical diagnosis and procedures, CPB data, all medication, blood product and intravenous fluid administration, total volume of study fluid administered, blood lost during surgery to sponges and suction and 24 hour mediastinal drainage will be recorded for all subjects. Any cases of incomplete re-infusion of study blood product will be noted as will the reason for the occurrence.

  Eligibility

Ages Eligible for Study:   2 Years to 10 Years
Genders Eligible for Study:   Both
Accepts Healthy Volunteers:   No
Criteria

Inclusion Criteria:

  • Children between 15 and 30 kg undergoing cardiac surgery requiring cardiopulmonary bypass at British Columbia's Children's Hospital.
  • All children will be between 2 and 10 years of age.
  • Surgery will only involve single atriotomy.
  Contacts and Locations
Choosing to participate in a study is an important personal decision. Talk with your doctor and family members or friends about deciding to join a study. To learn more about this study, you or your doctor may contact the study research staff using the Contacts provided below. For general information, see Learn About Clinical Studies.

Please refer to this study by its ClinicalTrials.gov identifier: NCT00624611

Locations
Canada, British Columbia
BC Children's Hospital
Vancouver, British Columbia, Canada, V6H 3V4
Sponsors and Collaborators
University of British Columbia
Investigators
Principal Investigator: Norbert Froese, MD University of British Columbia
Study Director: John Wu University of British Columbia
Study Director: Jacques LeBlanc University of British Columbia
Study Director: Andrew Campbell University of British Columbia
Study Director: Doug Salt University of British Columbia
Study Director: Pascal Lavoie University of British Columbia
  More Information

No publications provided

Responsible Party: Dr. Norbert Froese, University of British Columbia
ClinicalTrials.gov Identifier: NCT00624611     History of Changes
Other Study ID Numbers: H07-01444
Study First Received: February 13, 2008
Last Updated: April 12, 2011
Health Authority: Canada: Health Canada

Keywords provided by University of British Columbia:
CPB
red blood cell washing

ClinicalTrials.gov processed this record on August 21, 2014