Original Article

Blood Volume Sequestration in Cardiotomy Reservoirs: An In-Vitro Evaluation

RMI, Inc, Westlake Village, CA

^* Direct communications to: Gary D. Reeder, 2500 Townsgate Rd.—Suite E. Westlake Village, CA 91361

Abstract

An in-vitro evaluation of the dynamic volume loss of several clinically available cardiotomy reservoirs was conducted. The reservoirs were grouped according to microfiltration rating (20 to 40 u) and the dynamic sequestration of each was examined over a blood flow range of 0 to 8 L/min. A statistically significant decrease in both static and dynamic volume loss was found to be associated with increasing microfiltration pore size. Furthermore, significant differences in volume sequestration were demonstrated between devices within each group over the blood flow range of 0 to 3200 ml/min. The Dideco D-744 reservoir was found to produce the least volume sequestration over this flow range. The Dideco D-742 and Bard H-710F exhibited somewhat greater volume losses over the same flow range. The Bard H-700F and American Bentley BCR- 3500 and Q-220F exhibited the greatest static and dynamic volume losses of the reservoirs tested. Total recoverable blood volume was evaluated and the Dideco D-744, D-742 and Bard H-710 were found to be superior, in this respect, to the other devices examined in this series.

The data presented demonstrates that, of the devices tested, the D-744, D-742 and H-710F are superior to the others in high cardiotomy flow applications where sequestration may be of significant concern.