Myocardial dysfunction caused by ischemia can be aggravated by complement activation.
In a clinical setting of urgent surgical coronary artery revascularisation after myocardial ischemia and cardiopulmonary bypass (CPB), possible influences of systemic complement inhibition on left and right ventricular function, regional microvascular perfusion and decrease of the infarction area were assessed.
20 pigs were randomized in two groups. Left anterior descending artery (LAD) was occluded for 2 hours, including one hour of cardioplegic arrest on CPB. C1-INH (25IE/kg) or NaCl was administrated systemically 60 minutes after LAD occlusion. CPB was succeeded by reperfusion and weaning from CPB, followed by two hours of observation. At five different moments during the experiment we determinated the right and left ventricular function and measured the regional microvascular blood flow. Infarct size and area at risk were calculated from the excised hearts.
LAD ligation for 1h resulted in (C1-INH vs control, mean ± SD): Heart rate (HR) 88±21vs 95±31, aortic pressure (AoP) 81±11 vs 93±19.9, ventricular enddiastolic pressure for LV (LVPed) 18.9±4.7 vs 21.7±5.5 and for RV (RV Ped) 13.5±3.8 vs 13.2±2.8. 2h after weaning from CPB (C1-INH vs control, mean ± SD): HR 110±18 vs 107±18, AoP 72±18.52 vs 74±15.9, LVPed 14.9±5.4 vs 17.6±5.4, RVPed 13.5±4.7 vs 13.6±3.5.
Although both ventricles were affected by the infarction, no significant differences between the two groups were found in respect to haemodynamics, regional blood flow and area at risk.
Contrary to previous studies systemic application of C1-INH had no cardioprotective effects in our acute infarction model.
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Myocardial dysfunction caused by ischemia can be aggravated by complement activation.
In a clinical setting of urgent surgical coronary artery revascularisation after myocardial ischemia and cardiopulmonary bypass (CPB), possible influences of systemic complement inhibition on left and right ventricular function, regional microvascular perfusion and decrease of the infarction area were assessed.
20 pigs were randomized in two groups. Left anterior descending artery (LAD) was occluded for 2...
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