Table 1 Demographics and status before randomization of 300 patients by treatment groups

Demographics and status1st syringe/2nd syringe
Magnesium/diazepam, n = 75Magnesium/placebo, n = 75Placebo/diazepam, n = 75Placebo/ placebo, n = 751st syringe Magnesium,  Placebo, n = 150   n = 1502nd syringe Diazepam,   Placebo, n = 150   n = 150
For continuous variables mean (SD) is displayed. For discrete variables, percent is displayed.
* Some patients experienced cardiac arrest after the arrival of the paramedics so the sum of patients with arrest on arrival of paramedics and patients with pulse by arrival of paramedics does not yield 100%.
CPR = cardiopulmonary resuscitation; VF = ventricular fibrillation; SBP = systolic blood pressure.
Age, y (SD)63.7 (18.9)69.2 (14.7)62.9 (16.0)65.6 (15.5)66.4 (17.1)64.2 (15.7)63.3 (17.5)67.4 (15.2)
Men, %64.065.377.372.064.774.770.768.7
White, %81.380.077.385.380.781.379.382.7
Arrest at home or nursing home, %65.362.756.056.064.056.060.759.3
Witnessed arrest, %60.066.757.373.363.365.358.770.0
Bystander CPR, %45.361.348.056.053.352.046.758.7
Response interval of first unit, min (SD)4.4 (1.9)4.4 (2.0)4.3 (1.8)4.4 (1.8)4.4 (2.0)4.3 (1.8)4.4 (1.9)4.4 (1.9)
Response interval of paramedics, min (SD)8.2 (3.3)7.6 (4.1)7.6 (3.6)7.9 (4.1)7.9 (3.7)7.8 (3.8)7.9 (3.5)7.8 (4.1)
Cardiac arrest on arrival of first responders, %93.392.094.790.792.792.794.091.3
Cardiac arrest on arrival of paramedics,* %93.377.384.082.785.383.388.780.0
Pulse back by arrival of paramedics,* %4.014.712.08.09.310.08.011.3
Initial rhythm VF, %57.356.053.353.356.753.355.354.7
After arrest before randomization
    Shocked, %73.366.770.774.770.072.772.070.7
    Pupillary light response, %10.729.317.318.720.018.014.024.0
    Spontaneous breathing, %42.760.042.752.051.347.342.756.0
    Vasopressor, %17.36.717.316.012.016.717.311.3
    Bradycardia treatment, %16.016.08.014.716.011.312.015.3
    Paralytic agent, %5.321.38.017.313.312.76.719.3
    Diazepam, %5.36.74.06.76.05.34.76.7
    Qualifying SBP, mm Hg (SD)133.3 (31.3)146.1 (44.9)140.7 (37.9)143.8 (39.4)139.7 (39.0)142.3 (38.6)137.0 (34.8)145.0 (42.1)