Randomised trial of magnesium in in-hospital cardiac arrest. Duke Internal Medicine Housestaff.
BACKGROUND
The apparent benefit of magnesium in acute myocardial infarction, and the persistently poor outcome after cardiac arrest, have led to use of magnesium in cardiopulmonary resuscitation. Because few data on its use in cardiac arrest were available, we undertook a randomised placebo-controlled trial (MAGIC trial).


METHODS
Patients treated for cardiac arrest by the Duke Hospital code team were randomly assigned intravenous magnesium (2 g [8 mmoles] bolus, followed by 8 g [32 mmoles] over 24 h; 76 patients) or placebo (80 patients). Only patients in intensive care or general wards were eligible; those whose cardiac arrest occurred in emergency, operating, or recovery rooms were excluded. The primary endpoint was return of spontaneous circulation, defined as attainment of any measurable blood pressure or palpable pulse for at least 1 h after cardiac arrest. The secondary endpoints were survival to 24 h, survival to hospital discharge, and neurological outcome. Analysis was by intention to treat.


RESULTS
There were no significant differences between the magnesium and placebo groups in the proportion with return of spontaneous circulation (41 [54%] vs 48 [60%], p = 0.44), survival to 24 h (33 [43%] vs 40 [50%], p = 0.41), survival to hospital discharge (16 [21%] vs 17 [21%], p = 0.98), or Glasgow coma score (median 15 in both).


CONCLUSIONS
Empirical magnesium supplementation did not improve the rate of successful resuscitation, survival to 24 h, or survival to hospital discharge overall or in any subpopulation of patients with in-hospital cardiac arrest.
Thel
M C
MC
Duke Clinical Research Institute, Duke University Medical Center, Durham, NC 27710, USA.
Armstrong
A L
AL
McNulty
S E
SE
Califf
R M
RM
O'Connor
C M
CM
D000368:Aged; D016887:Cardiopulmonary Resuscitation; D004311:Double-Blind Method; D005260:Female; D006323:Heart Arrest / Q000188:drug therapy* / Q000401:mortality / Q000628:therapy; D006760:Hospitalization; D006801:Humans; D007262:Infusions, Intravenous; D008278:Magnesium Sulfate / Q000008:administration & dosage / Q000627:therapeutic use*; D008297:Male; D008875:Middle Aged; D015996:Survival Rate
D008278:Magnesium Sulfate