the study involved 239 patients , 226 pulseless , nonbreathing patients ( rhythms of asystole and electromechanical dissociation with heart rates less than 70 ) and 13 patients with hemodynamically significant bradycardia ( heart rate less than 60 ; blood pressure less than 90 mm hg ; not responding to atropine ) .
C0018790
asystole
C0004259
atropine