Fig. 4. Activity of lactate dehydrogenase (A ), creatine kinase (B ), myoglobin (C ), creatine kinase–muscle and brain subunit (D ), and N-terminal pro brain natriuretic brain peptide (E ) in plasma obtained from pigs after cardiopulmonary bypass (CPB), CPB + carbon monoxide (CO), and CPB + CO + tin protoporphyrin IX (SnPP IX) and time-matched control group (SHAM) animals. Data represent mean ± SD. * P < 0.05, CPB versus SHAM and versus CPB + CO. # P < 0.001, CPB + CO + SNPP IX versus CPB + CO.