Biomarker and Thrombogenicity Assessment in Cardiopulmonary Bypass Surgery Utilizing Acute Normovolemic Hemodilution

Acute Normovolemic Hemodilution (ANH) involves the removal of the patients own blood immediately at the induction of anesthesia and replacement of this blood intraoperatively with an equivalent volume of crystalloid or colloid solution in order to dissuade the loss of red blood cell mass, the mechanism of action is dilution of the blood, hematocrit reduction, and reduction of the anticoagulant components of the blood associated with bleeding during cardiopulmonary bypass graft surgery. The collected blood is isolated from the negative effects of the cardiopulmonary bypass machine.. The collected blood is then stored in anticoagulant treated blood bags in the cardiovascular operating room and re-infused into the patient in reverse order of collection at the commencement of surgery, leaving the most cell rich blood to be re-infused into the patient last. This study will evaluate the effect in patients with and without ANH utilization on; hemostatic markers, chest tube drainage 24 hours post CABG, and need for allergenic blood transfusion. Positive effects on the hemostatic markers of anticoagulation and platelets, reduced chest tube drainage at 24 hours post CABG, and reduced number of transfused red blood cells will indicate a positive correlation with ANH utilization during isolated on pump CABG surgery.

The benefits of ANH utilization in blood conservation will benefit patients by reducing their exposure to allogenic blood transfusion with its myriad side effects.

Inclusion criteria

• . Subject is 18-85 years old.
• . Subject is hemodynamically stable
• . The subject is able to read and has signed and dated the informed consent document including Health Insurance Portability and Accountability Act of 1996 (HIPAA) authorization permitting release of personal health information as approved by the investigator's Institutional Review Board (IRB).

Exclusion criteria

• . Hematocrit <30 at baseline
• . Insufficient (Low) on pump hematocrit of < 21%
• . Patient is hemodynamically unstable
• . Patient requiring an emergency procedure
• . Left main coronary artery stenosis with evidence of hemodynamic instability (e.g.. hypotension, ST segment elevations on electrocardiogram)
• . Aortic valve stenosis with evidence of hemodynamic instability (e.g.. hypotension, ST segment elevations on electrocardiogram)