Two studies published by The BMJ today evaluate treatments for patients with cardiac arrest in hospital.
The first study suggests that advice to delay giving a second heart shock, known as defibrillation, to patients with cardiac arrest in hospital is not associated with improved survival.
Guidelines previously called for "stacked" shocks with minimal time delay between defibrillation attempts. But in 2005 the guidelines were revised to recommend deferring a second attempt at defibrillation to allow time for chest compressions.
However, data on the effect of these changes on survival for patients with cardiac arrest in hospital are lacking.