Following a March 2008 scientific advisory published in the journal Circulation, bystanders are formally encouraged to immediately perform continuous chest compressions as cardiopulmonary resuscitation (CPR) in some cases of out-of-hospital sudden cardiac arrest. Some medical professionals have been making this recommendation for years; Dr. Michael Sayre, associate professor of emergency medicine at the Ohio State University College of Medicine and lead author of this advisory, updates us on the CPR discussion. For what cases of cardiac arrest should we instruct the general public to avoid assisted ventilation? Find out more with host Dr. Mark Nolan Hill.