Cardiopulmonary Bypass with Low- Versus High-Priming Volume: Comparison of Inflammatory Responses in a Rat Model

ASAIO Journal : a Peer-reviewed Journal of the American Society for Artificial Internal Organs
Yutaka FujiiEisuke Tatsumi

Abstract

A cardiopulmonary bypass (CPB) can preserve life. However, interactions between blood and large artificial surfaces might help to provoke a series of chain reactions during CPB that result in the formation and release of numerous powerful inflammatory mediators including hormones and autacoids. We postulated that small CPB circuits with reduced priming volumes and less surface areas that come into contact with blood would attenuate systemic inflammatory responses by reducing the levels of cytokines and organ tissue damage during CPB. Rats were assigned to groups that underwent CPB with a high priming volume (PV) of 15 ml and a surface area of 0.044 m or a low PV of 7 ml and a surface area of 0.034 m. We measured serum levels of cytokines and biochemical markers during CPB. Levels of proinflammatory cytokines and biochemical markers were significantly elevated in the group with a high PV, than low PV at 60 min, whereas none of these factors significantly differed between the groups at 120 min. These data suggested that in addition to blood being in contact with surfaces, the duration of CPB exposure is also an important factor for nonlinear time variances in damage caused by the systemic inflammatory response.

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