Correlation of magnesium deficiency with C-reactive protein in elective cardiac surgery with cardiopulmonary bypass for ischemic heart disease.
Cardiac surgery is associated with systemic inflammatory response, which is triggered by cardiopulmonary bypass (CPB) and possibly with underlying magnesium deficiency. Animal studies have shown that magnesium deficiency intensifies oxidative stress and inflammatory processes. We aimed to find a link between serum, erythrocyte, cardiac tissue magnesium concentration and C-reactive protein (CRP) as an inflammatory marker in patients undergoing elective cardiac surgery with CPB. The data of 27 patients undergoing elective cardiac surgery with CPB for ischemic heart disease were analyzed. Measurements were taken at the baseline, i.e., 24h before surgery (serum magnesium, CRP); time point 1, before CPB (serum, erythrocyte and cardiac tissue magnesium); time point 2, after CPB (serum, erythrocyte and cardiac tissue magnesium), and time point 3, 15-17h after surgery (serum, erythrocyte magnesium, CRP). There was a negative correlation between baseline serum magnesium and baseline CRP (P=0.009; r=-0.492), negative correlation between cardiac tissue magnesium at the time point 1 and baseline CRP (P=0.021; r=-0.443), and positive correlation between CRP at time point 3 and erythrocyte magnesium at time point 2 (P<0.001; r=0.637). The data of our study verify that inflammatory marker CRP and magnesium concentration in serum and cardiac tissue before the surgery are inversely related in patients undergoing elective cardiac surgery with CPB. Well-planned further studies are needed to evaluate the importance of underlying magnesium deficiency on the severity of systemic inflammatory response and postoperative complications after surgery with CPB.
Correspondence to M. Švagždienė Department of Cardiothoracic and Vascular Surgery, Medical Academy, Lithuanian University of Health Sciences, Eivenių 2, 50161 Kaunas, Lithuania. E-mail address: mmasiokaite@yahoo.com
Received 23 January 2014, accepted 1 March 2015, available online 1 April 2015.