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Intraoperative Magnesium Administration Does Not Reduce Postoperative Atrial Fibrillation After Cardiac Surgery.

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High-dose magnesium (Mg) therapy did not reduce the incidence of new-onset postoperative atrial fibrillation (POAF) in patients undergoing cardiac surgery. This prospective, placebo-controlled trial found no significant difference in POAF rates between Mg and placebo groups.

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Area of Science:

  • Cardiology
  • Anesthesiology
  • Pharmacology

Background:

  • Hypomagnesemia is linked to increased risk of postoperative atrial fibrillation (POAF).
  • Previous studies on magnesium (Mg) therapy for POAF are limited by small sample sizes and low doses.
  • The hypothesis tested was that high-dose Mg reduces new-onset POAF after cardiac surgery.

Purpose of the Study:

  • To evaluate the efficacy of high-dose intraoperative magnesium therapy in preventing new-onset postoperative atrial fibrillation (POAF).
  • To assess the effect of magnesium on POAF incidence in patients undergoing cardiac surgery within a prospective trial.

Main Methods:

  • A double-blind, placebo-controlled trial involving 389 patients undergoing cardiac surgery.
  • Randomization to receive either a high-dose magnesium (100 mg/kg total) or placebo.
  • Logistic regression analysis adjusted for the Multicenter Study of Perioperative Ischemia risk index for Atrial Fibrillation after Cardiac Surgery.

Main Results:

  • Among 363 analyzed patients, the incidence of new-onset POAF was 42.5% in the Mg group versus 37.9% in the placebo group (P = 0.40).
  • No significant difference in POAF onset time was observed between the magnesium and placebo groups.
  • Logistic regression analysis showed no significant effect of magnesium on POAF after adjusting for AF risk (OR, 1.09; P = 0.73).

Conclusions:

  • High-dose intraoperative magnesium therapy is ineffective in decreasing the incidence of new-onset POAF following cardiac surgery.
  • The study did not support the hypothesis that increased magnesium administration prevents POAF in this patient population.