Manganese-containing superoxide dismutase in blood and urine during open-heart surgery.
Concentrations of Manganese-containing superoxide dismutase (Mn-SOD) were measured perioperatively by enzyme immunoassay in serial samples of arterial and coronary sinus blood and urine taken from 18 patients undergoing mitral valve surgery. The mean Mn-SOD concentration in the arterial blood samples was 66.2 (SD 16.1 ng/ml) at induction of anesthesia, increased gradually after reperfusion and peaked on the 2nd post-operative day [150 (SD 58.3) ng/ml]. The mean concentration of Mn-SOD in the coronary sinus blood samples was significantly higher than in the arterial samples only at the 6th hour after reperfusion [97 (SD 21.8) ng/ml vs 90.3 (SD 20.9) ng/ml, p < 0.05]. Although concentrations of Mn-SOD in blood did not increase in 8 patients who underwent midline sternotomy for a mediastinal tumor, they increased dramatically in 3 patients who sustained a perioperative myocardial infarction. During open heart surgery the peak values of plasma Mn-SOD concentrations were correlated to that of plasma creatine kinase-MB concentrations (r = 0.5532, n = 18, p < 05) and cardiac ischemic period (r = 0.5186, n = 18, p < 05). Although the meaning of an increase in plasma Mn-SOD concentrations during open heart surgery is not clarified, it may be released from the heart and anywhere also in the body damaged during cardiopulmonary bypass.
Usui
A
A
Department of Thoracic Surgery, Nagoya University School of Medicine, Japan.
Kato
K
K
Murase
M
M
Maeda
M
M
Koyama
T
T
Tanaka
M
M
Takeuchi
E
E
Abe
T
T
D003331:Coronary Vessels; D003402:Creatine Kinase / Q000097:blood; D005260:Female; D016166:Free Radical Scavengers; D006350:Heart Valve Prosthesis; D006801:Humans; D007124:Immunoenzyme Techniques; D007432:Intraoperative Period; D007527:Isoenzymes; D008297:Male; D008875:Middle Aged; D008943:Mitral Valve / Q000601:surgery*; D008944:Mitral Valve Insufficiency / Q000201:enzymology* / Q000601:surgery; D008946:Mitral Valve Stenosis / Q000201:enzymology* / Q000601:surgery; D015425:Myocardial Reperfusion; D013482:Superoxide Dismutase / Q000097:blood / Q000378:metabolism* / Q000652:urine
D016166:Free Radical Scavengers; D007527:Isoenzymes; D013482:Superoxide Dismutase; D003402:Creatine Kinase