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Ann Thorac Surg 2000;70:1296-1300
© 2000 The Society of Thoracic Surgeons
a Department of Cardiothoracic Surgery, Wake Forest University School of Medicine, Winston-Salem, North Carolina, USA
b Department of Anesthesiology, Wake Forest University School of Medicine, Winston-Salem, North Carolina, USA
c Department of Radiology, Wake Forest University School of Medicine, Winston-Salem, North Carolina, USA
Address reprint requests to Dr Hammon, Department of Cardiothoracic Surgery, Wake Forest University School of Medicine, Medical Center Blvd, Winston-Salem, NC 27157
e-mail: jhammon{at}wfubmc.edu
Presented at the Forty-sixth Annual Meeting of the Southern Thoracic Surgical Association, San Juan, Puerto Rico, Nov 4–6, 1999.
Background. Microembolization during cardiopulmonary bypass (CPB) can be detected in the brain as lipid deposits that create small capillary and arteriolar dilations (SCADs) with ischemic injury and neuronal dysfunction. SCAD density is increased with the use of cardiotomy suction to scavenge shed blood. Our purpose was to determine whether various methods of processing shed blood during CPB decrease cerebral lipid microembolic burden.
Methods. After hypothermic CPB (70 minutes), brain tissue from two groups of mongrel dogs (28 to 35 kg) was examined for the presence of SCADs. In the arterial filter (AF) group (n = 12), shed blood was collected in a cardiotomy suction reservoir and reinfused through the arterial circuit. Three different arterial line filters (Pall LeukoGuard, Pall StatPrime, Bentley Duraflo) were used alone and in various combinations. In the cell saver (CS) group (n = 12), shed blood was collected in a cell saver with intermittent preocessing (Medtronic autoLog model) or a continuous-action cell saver (Fresenius Continuous Auto Transfusion System) and reinfused with and without leukocyte filtration through the CPB circuit.
Results. Mean SCAD density (SCAD/cm2) in the CS group was less than the AF group (11 ± 3 vs 24 ± 5, p = 0.02). There were no significant differences in SCAD density with leukocyte filtration or with the various arterial line filters. Mean SCAD density for the continuous-action cell saver was 8 ± 2 versus 13 ± 5 for the intermittent-action device.
Conclusions. Use of a cell saver to scavenge shed blood during CPB decreases cerebral lipid microembolization.
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Ann. Thorac. Surg. 2000 70: 1300.
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