Table 1

Demographic data for the MICA study

MagnesiumPlacebo
*CPR given by medical, nursing, paramedical or trained first aid responders; †CPR given by the lay public.
Number5253
Male (%)37 (71)37 (70)
Median age in years (IQR)65 (15)67 (12)
Site of CPA (%)
    At home34 (65)21 (39)
    In public place11 (21)16 (30)
    At work3 (6)6 (11)
    In ambulance3 (6)6 (11)
    In A&E1 (2)2 (4)
    At GP surgery02 (4)
Witnessed arrest (%)42/47 (93)43/49 (88)
Unrecorded data5/52 (10)4/53 (8)
Bystander CPR (%)
    Professional CPR*9/48 (19)19/49 (39)
    Lay CPR†13/48 (28)10/49 (20)
    No CPR26/48 (54)20/49 (41)
    Unrecorded data4/52 (8)4/53 (7)
Median response time interval in minutes (range)8 (1–25)8 (1–18)
Initial rhythm (%)
    VF38 (73)39 (74)
    EMD11 (21)12 (23)
    Asystole3 (6)2 (4)