PMID: 8969379Sep 1, 1996Paper

Blood ionized magnesium concentrations during cardiopulmonary bypass and their correlation with other circulating cations

Journal of Cardiac Surgery
S AzizM A Kenny

Abstract

The recent introduction of new measurement technology (using ion specific electrodes) makes intraoperative evaluation of blood ionized magnesium (Mg2+, or iMg)--the bioactive fraction of circulation magnesium--possible. The goals of this study were: (1) to examine the longitudinal pattern(s) of change in blood iMg during cardiopulmonary bypass (CPB); and (2) to determine the relationship of iMg to Ca2+ (iCa), K, pH, Na, and hematocrit (Hct) during CPB. Blood was collected serially before, during, and after CPB on 30 patients undergoing elective coronary artery bypass graft procedures and the iMg was measured with an AVL Scientific Corp., model 988-4 instrument. Overall, 73% of iMg results were abnormally low, 50% during CPB. Some cases had both hypo- and hyperionized magnesemic episodes. There were low iCa during CPB in 97% of cases. Using Spearman's rank order correlations and p < 0.05, iMg and K were directly correlated before, during, and after bypass, suggesting their parallel movement between tissue and blood. iMg and iCa were directly correlated before, and inversely correlated after, CPB, but unassociated during bypass. iMg and Na were inversely correlated after bypass in all cases. iMg was inversely correlated to pH and...Continue Reading

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Citations

Jul 31, 2003·Journal of Clinical Anesthesia·Marcella J LanzingerRichard E Moon
Jan 6, 1999·Critical Care Medicine·R T FiserJ L Valentine
Feb 24, 2001·Critical Care Clinics·M J Dacey
Jul 17, 1998·Anesthesiology·M N Gomez
Mar 26, 2003·Pediatrics International : Official Journal of the Japan Pediatric Society·Kenji HoshinoReiko Kitazawa

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