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The Annals of Thoracic Surgery, Vol 53, 247-252, Copyright © 1992 by The Society of Thoracic Surgeons

ARTICLES

Activated neutrophils impair rabbit heart recovery after hypothermic global ischemia

ML Myers, C Webb, M Moffatt, D McIver and R Del Maestro
Division of Cardiovascular Surgery, Victoria Hospital, London, Ontario, Canada.

Cardiopulmonary bypass is known to cause neutrophil activation, and activated neutrophils appear to be of importance in myocardial reperfusion injury. This study examined the effect of a preischemic infusion of activated neutrophils on the recovery of myocardial function after 40 minutes of hypothermic global ischemia. Studies were carried out in three groups of Langendorff-perfused rabbit hearts: control, control (unactivated) neutrophil infusion, and phorbol myristate acetate-activated neutrophil infusion. The activated neutrophil group showed significant deterioration in function during the activated neutrophil infusion. All three groups demonstrated significant depression of function initially after reperfusion, but the two control groups subsequently recovered to baseline levels. The activated neutrophil group, however, showed a persistent significant depression in ventricular force, rate of ventricular tension development, and rate of ventricular relaxation as well as a significant increase in coronary vascular resistance. It is concluded that activated neutrophils depress myocardial function and contribute to impaired recovery of function after global hypothermic ischemia.


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