No rescuer or bystander has ever been seriously harmed by receiving an inadvertent shock while in direct or indirect contact with a patient during deﬁbrillation. New evidence suggests that it might even be electrically safe for the rescuer to continue chest compressions during deﬁbrillation if self-adhesive deﬁbrillation electrodes are used and examination gloves are worn. This paper reviews the existing evidence, but warns more deﬁnite data are needed to make absolutely sure that there is no risk before deﬁbrillation safety recommendations are changed.
Is external defibrillation an electric threat for bystanders?
Resuscitation. 2009 Apr;80(4):395-401
Hyperoxia may reduce coronary artery blood flow, increase systemic vascular resistance, and decrease cardiac output. This paper argues that if the baseline arterial oxygen saturations are >90%, high concentration oxygen does not increase oxygen transport, as the reductions in cardiac output are in excess of the increase in oxygen content. The balance of the limited evidence that exists suggests that the routine use of oxygen in uncomplicated MI (no failure or shock) may increase infarct size and possibly increase the risk of mortality, owing to its haemodynamic effects, including a reduction in coronary blood flow.
Routine use of oxygen in the treatment of myocardial infarction: systematic review
Heart. 2009 Mar;95(3):198-202