A prospective, nonrandomized, open-labeled pilot study investigating the use of magnesium in patients undergoing nonacute percutaneous coronary intervention with stent implantation.
BACKGROUND
Magnesium has recently been shown to inhibit acute stent thrombosis in animal models. This study tested the feasibility of magnesium administration in patients undergoing nonacute percutaneous coronary intervention with stent implantation.


METHODS
Twenty-one patients undergoing nonemergent percutaneous coronary intervention were enrolled and received intravenous magnesium sulfate (2-g bolus over 20 minutes prepercutaneous coronary intervention, followed by 14 g over 12 hours infusion).


METHODS
safety outcomes--hypotension, bradycardia, bleeding complications and heart block within first 24 hours; angiographic outcomes--acute thrombotic occlusion and need for platelet glycoprotein IIb/IIIa inhibitor bailout; and clinical outcomes--death, myocardial infarction, recurrent ischemia, and need for urgent revascularization at 48 hours and 30 days.


RESULTS
No significant effects on heart rate or blood pressure, major bleeding complication, or new electrocardiographic changes were observed. Angiographic thrombus was visualized in two cases, and coronary artery dissection in one case poststent deployment. None of these cases required the use of glycoprotein inhibitors for bailout. Death, myocardial infarction, recurrent ischemia, and need for urgent revascularization were not observed. The serum magnesium level increased from 2.1 +/- 0.3 mg/dL at baseline to 3.5 +/- 0.8 mg/dL at the end of the infusion (P <.0001). Platelet activation was significantly inhibited at the end of the magnesium sulfate infusion.


CONCLUSIONS
Intravenous magnesium sulfate has been demonstrated as a feasible and safe agent in patients undergoing nonacute percutaneous coronary intervention with stent implantation. A randomized clinical trial comparing magnesium with glycoprotein inhibitors during percutaneous coronary intervention is warranted.
D000368:Aged; D015906:Angioplasty, Balloon, Coronary; D017023:Coronary Angiography; D003327:Coronary Disease / Q000097:blood / Q000000981:diagnostic imaging / Q000628:therapy; D003328:Coronary Thrombosis / Q000209:etiology / Q000517:prevention & control*; D004334:Drug Administration Schedule; D004562:Electrocardiography; D006801:Humans; D007262:Infusions, Intravenous; D008278:Magnesium Sulfate / Q000008:administration & dosage / Q000627:therapeutic use*; D008297:Male; D008875:Middle Aged; D010865:Pilot Projects; D010974:Platelet Aggregation / Q000187:drug effects; D011446:Prospective Studies; D015607:Stents; D016896:Treatment Outcome
D008278:Magnesium Sulfate