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Arrhythmia prophylaxis after coronary artery bypass grafting: regimens of magnesium sulfate administration
G Speziale1, G Ruvolo, K Fattouch
1Institute of Cardiac Surgery, La Sapienza University, Rome, Italy. g.speziale@libero.it
Insights
Magnesium sulfate infusion effectively reduces postoperative arrhythmias in patients undergoing coronary artery bypass grafting (CABG). Regimens in Groups B and C significantly decreased atrial and ventricular arrhythmic events post-surgery.
Area of Science:
- Cardiology
- Cardiovascular Surgery
- Anesthesiology
Background:
- Postoperative arrhythmias are a common complication following open heart surgery, potentially linked to hypomagnesemia induced by cardiopulmonary bypass.
- While perioperative magnesium (Mg2+) may prevent arrhythmias after coronary artery bypass grafting (CABG), optimal timing, dosage, and administration routes require clarification.
Purpose of the Study:
- To evaluate the antiarrhythmic efficacy of magnesium (Mg2+) sulfate infusion in patients undergoing elective coronary artery bypass grafting (CABG).
Main Methods:
- Ninety-seven patients undergoing elective CABG were randomized into four groups: three receiving different magnesium sulfate regimens and one placebo control.
- Magnesium sulfate was administered via pump prime, cardioplegic solution, and/or continuous infusion.
- Continuous electrocardiogram monitoring and serum magnesium level measurements were performed preoperatively and postoperatively.
Main Results:
- Serum Mg2+ levels decreased during cardiopulmonary bypass in all groups, with levels remaining significantly lower in the placebo group post-surgery.
- Magnesium sulfate administration in Groups B and C led to progressive increases in serum Mg2+ levels post-infusion.
- Groups B and C showed statistically significant reductions in atrial ectopics, atrial fibrillation, and ventricular arrhythmic events compared to Groups A and D.
Conclusions:
- Specific magnesium (Mg2+) sulfate administration regimens, as used in Groups B and C, are effective in reducing postoperative arrhythmic events in patients undergoing CABG.
- These findings support the use of targeted Mg2+ administration to mitigate arrhythmias after CABG.
Background:
Arrhythmias are common after open heart surgery and may be related to hypomagnesaemia due to cardiopulmonary bypass. Although perioperative prophylactic Mg2+ administration may prevent arrhythmias after coronary artery bypass grafting (CABG), clear indications as well as the timing of Mg2+ substitution and dose regimen need to be clarified. Aim of this study was to evaluate the antiarrhythmic effects of Mg2+ infusion in patients who underwent elective CABG.
Method:
Ninety-seven patients who underwent elective CABG were divided in four Groups. In Group A 1 g of magnesium sulfate was added to the pump prime, Group B received 1 g in the pump prime plus 5 mmol/L in the cardioplegic solution, Group C received 5 mmol/L in the cardioplegic solution, and Group D was a placebo control Group. Groups A, B, and C also received 24 h continuous infusion of magnesium sulfate at 10 mmol/L. Three-channel electrocardiogram (II-V5-V6) continuous monitoring was performed 12 hours preoperatively and 48 hours postoperatively. Blood samples were taken for subsequent Serum magnesium measurements, at five different time points before, during and after CBP.
Results:
In all Groups serum Mg2+ levels were reduced during CPB (Time 2) and statistically significant differences from pre-anaesthesia levels (Time 1) were noted (p <0.05). In Groups A, B, and C Serum Mg2+ levels increased progressively from Time 3 to Time 5; in Group D serum Mg2+ levels were still much lower at Time 5. Significant differences (p<0.05) were noted for Groups B and C vs Groups A and D in atrial ectopics, atrial fibrillation, and ventricular arrhythmic events.
Conclusion:
Our results demonstrate that Mg2+ sulfate administration regimens used in Group B and C reduce postoperative arrhythmic events in patients undergoing CABG.