1 The role of ionised magnesium compound in cardiac surgery 1 Patients: This was a clinical study of ionized and total magnesium compounds in 30 patients, assessedperioperatively, when undergoing Coronary Artery Bypass Graft (CABG) procedures. The mean age of the patients (3 females and 27 males) was 61.6± 9.6years, ranging from 35-76 years. All patients underwent a CABG with an average duration of cardiopulmonary bypass of 79.2 ±26.9minutes.Patientswith a history of renal insufficiency, pulmonary disease, implanted pacemaker or any previous cardiac operation were excluded from the study.Investigations: Totaland ionized magnesium,and calcium compounds in serum, as well as Na+, K+, phosphate, creatinine, urea, cholesterol, triglyceride, protein, and albumin were assessedperioperatively. These were characterised as before induction of anesthesia(Point A), after cardiopulmonary bypass (Point B), one hour after admission to intensive care unit (Point C), and the next postoperativemorning (Point D). Result: Onlyone (3%) patient showed preoperativeionizedhypomagnesemia, and another one (3%) showedhypermagnesemia. Following the CABG procedure, (Point B), ionized magnesium levels were statistically reduced followed by a gradual elevation which reached almost initial values (Point A versusPoint D, p>0.05).There did not seem to be any influence of one form of magnesium compound on another. The total postoperativerhythm disturbances (14/36), which needed therapy in the intensive care unit, showed 8 out of 30 (26%) of patients had ionized hypomagnesemia. No correlation was detected between spontaneous cardiac action after termination of the cardiopulmonary bypass, duration of ventilatory support and ionized magnesium levels. 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