Delayed cardioplegic reoxygenation reduces reoxygenation injury in cyanotic immature hearts Kai Ihnken, MD, Kiyozo Morita, MD, Gerald D Buckberg, MD The Annals of Thoracic Surgery Volume 66, Issue 1, Pages 177-182 (July 1998) DOI: 10.1016/S0003-4975(98)00320-8
Fig 1 Postbypass myocardial contractility expressed as percentage of recovery of end-systolic elastance. (Control = animals undergoing cardiopulmonary bypass without hypoxemia or cardioplegic arrest; No Hypoxemia = piglets undergoing cardioplegic arrest on cardiopulmonary bypass without hypoxemia; NoRx = hypoxemic animals undergoing reoxygenation on cardiopulmonary bypass including cardioplegic arrest; Rx = hypoxemic piglets treated with delayed reoxygenation; ∗ = p < 0.05 versus Control and No Hypoxemia; ∗∗ = p < 0.05 versus NoRx. The Annals of Thoracic Surgery 1998 66, 177-182DOI: (10.1016/S0003-4975(98)00320-8)
Fig 2 Antioxidant reserve capacity. Vulnerability of hypoxemic and reoxygenated myocardium to subsequent oxidant stress is determined by exposing cardiac homogenates to 0 to 4 mmol/L t-butylhydroperoxide. (MDA = malondialdehyde; Control [closed triangles] = animals undergoing cardiopulmonary bypass without hypoxemia or cardioplegic arrest; No hypoxemia [open circles] = piglets undergoing cardioplegic arrest on cardiopulmonary bypass without hypoxemia; NoRx [closed circles] = hypoxemic animals undergoing reoxygenation on cardiopulmonary bypass including cardioplegic arrest; Rx [open triangles] = hypoxemic piglets treated with delayed reoxygenation; ∗ = p < 0.05 versus all other groups.) The Annals of Thoracic Surgery 1998 66, 177-182DOI: (10.1016/S0003-4975(98)00320-8)
Fig 3 Myocardial conjugated diene (CD) production (as a marker of lipid peroxidation) during cardioplegic induction. (No hypoxemia = piglets undergoing cardioplegic arrest on CPB without hypoxemia; NoRx = hypoxemic animals undergoing reoxygenation on CPB including cardioplegic arrest; Rx = hypoxemic piglets treated with delayed reoxygenation; ∗ = p < 0.05 versus NoRx.) The Annals of Thoracic Surgery 1998 66, 177-182DOI: (10.1016/S0003-4975(98)00320-8)
Fig 4 Plasma conjugated diene levels from coronary sinus blood. (BCP = blood cardioplegic arrest; Control [closed squares] = animals undergoing cardiopulmonary bypass [CPB] without hypoxemia or cardioplegic arrest; No hypoxemia [open triangles] = piglets undergoing cardioplegic arrest on CPB without hypoxemia; NoRx [closed circles] = hypoxemic animals undergoing reoxygenation on CPB including cardioplegic arrest; Rx [open circles] = hypoxemic piglets treated with delayed reoxygenation; ∗ = p < 0.05 versus all other groups.) The Annals of Thoracic Surgery 1998 66, 177-182DOI: (10.1016/S0003-4975(98)00320-8)
Fig 5 Myocardial oxygen consumption (O2) during cardioplegic induction. (No hypoxemia [open circles] = piglets undergoing cardioplegic arrest on cardiopulmonary bypass without hypoxemia; NoRx [closed circles] = hypoxemic animals undergoing reoxygenation on cardiopulmonary bypass including cardioplegic arrest; Rx [open triangles] = hypoxemic piglets treated with delayed reoxygenation; ∗ = p < 0.05 versus No hypoxemia; ∗∗ = p < 0.05 versus NoRx.) The Annals of Thoracic Surgery 1998 66, 177-182DOI: (10.1016/S0003-4975(98)00320-8)