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The Journal of Thoracic and Cardiovascular Surgery, Vol 97, 900-905, Copyright © 1989 by The American Association for Thoracic Surgery and The Western Thoracic Surgical Association

ARTICLES

Perioperative exposure to plasticizers in patients undergoing cardiopulmonary bypass

YA Barry, RS Labow, WJ Keon, M Tocchi and G Rock
Ottawa Centre, Canadian Red Cross, Blood Transfusion Service, Ontario, Canada.

Di(2-ethylhexyl)phthalate and its principal metabolite, mono(2- ethylhexyl)phthalate, are contaminants of blood that are extracted on contact with polyvinylchloride surfaces, such as blood collection bags and tubing used in cardiopulmonary bypass. In this study, levels of the two plasticizers were measured in patients who underwent coronary artery bypass grafting, orthotopic transplantation, implantation of the Jarvik 7-70 total artificial heart during bridge-to-transplant procedures, and in infants who underwent corrective operations for congenital defects. In all adult patients the levels of di(2- ethylhexyl)phthalate increased tenfold by the end of cardiopulmonary bypass, whereas the levels of mono(2-ethylhexyl)phthalate increased ninefold. In infants, levels of di(2-ethylhexyl)phthalate rose seven times by the end of bypass and mono(2-ethylhexyl)phthalate rose significantly as well. In most of the patients having coronary bypass, the two plasticizers declined to preoperative levels within 24 hours. However, in some of the patients having orthotopic transplantation and in those in whom the Jarvik 7-70 total artificial heart was used as a bridge to transplant, the levels were still detectable 120 hours postoperatively. Circulating levels of mono(2-ethylhexyl)phthalate are only 20- to 35-fold lower in patients undergoing cardiac operations than the level of mono(2-ethylhexyl)phthalate causing a 50% reduction in developed contractile force and arrhythmias in an in vitro human atrial trabecular preparation. This study shows that patients with multisystem failure and infants may be at risk for this acute exposure to mono(2-ethylhexyl)phthalate.


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