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Oxygen-derived free radicals and hemolysis during open heart surgery

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Abstract

Reperfusion injury occurs during open-heart surgery after prolonged cardioplegic arrest. Cardiopulmonary bypass also is known to cause hemolysis. Since reperfusion of ischemic myocardium is associated with the generation of oxygen free radicals, and since free radicals can attack a protein molecule, it seems reasonable to assume that hemolysis might be the consequence of free radical attack on hemoglobin protein. The results of this study demonstrated that reperfusion following ischemic arrest caused an increase in free hemoglobin and free heme concentrations, simultaneously releasing free iron and generating hydroxyl radicals. In vitro studies using pure hemoglobin indicated that superoxide anion generated by the action of xanthine oxidase on xanthine could release iron from the heme ring and cause deoxygenation of oxyhemoglobin into ferrihemoglobin. This study further demonstrated that before the release of iron from the heme nucleus, oxyhemoglobin underwent deoxygenation to ferrihemoglobin. The released iron can catalyze the Fenton reaction, leading to the formation of cytotoxic hydroxyl radical (OH·). In fact, the formation of OH. in conjunction with hemolysis occurs during cardiac surgery, and when viewed in the light of the in vitro results, it seems likely that oxygen-derived free radicals may cause hemolysis during cardiopulmonary bypass and simultaneously release iron from the heme ring, which can catalyze the formation of OH·.

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Authors and Affiliations

  1. Cardiovascular Division, Department of Surgery, Surgical Research Center, University of Connecticut School of Medicine, 06030-1110, Farmington, Connecticut, USA

    Dipak K. Das, Xuekun Liu, Swapna Maity, John A. Rousou, Joseph Flack, Jitendra Laksmipati, Randall M. Jones & M. Renuka Prasad

  2. Department of Surgery, Baystate Medical Center, 01199, Springfield, Massachusetts, USA

    Richard M. Engelman & David W. Deaton

Authors
  1. Dipak K. Das
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  2. Richard M. Engelman
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  3. Xuekun Liu
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  4. Swapna Maity
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  5. John A. Rousou
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  6. Joseph Flack
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  7. Jitendra Laksmipati
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  8. Randall M. Jones
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  9. M. Renuka Prasad
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  10. David W. Deaton
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Das, D.K., Engelman, R.M., Liu, X. et al. Oxygen-derived free radicals and hemolysis during open heart surgery. Mol Cell Biochem 111, 77–86 (1992). https://doi.org/10.1007/BF00229577

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