This could save someone's life. If you have to do CPR on someone, concentrate on uninterrupted compressions.
https://cme.medscape.com/viewarticle/702525?src=cmenews
May 8, 2009 — Survival among adults with bystander-witnessed, out-of-hospital cardiac arrest with an initial rhythm of ventricular fibrillation (VF) improved from 22% to 44% following changes to a resuscitation protocol, a new study reports [1].

The historical protocol followed AHA 2000 guidelines, while the revised protocol modified this and advocated cardiopulmonary resuscitation (CPR) before defibrillation, increased chest compressions, and decreased emphasis on ventilations and intubation in order to promote cardiac perfusion, lead author Dr Alex G Garza (Georgetown University School of Medicine, Washington, DC) told heartwire .

"The study adds to the body of science demonstrating that chest compressions--and limiting interruptions to chest compressions--are one of the most important interventions that can be provided for out-of-hospital cardiac arrest," he said. The results speak for themselves, he added, noting that they found "dramatic" improvements in the percentages of patients who survived until hospital discharge and who had good neurological outcomes.

"For too long we have taught the 'ABC's' [airway, breathing, circulation] when in fact it should probably be 'CBA,' meaning 'focus on circulation (compressions) first,' " said Garza.

The retrospective cohort study, which compared cardiac-arrest survival in Kansas City three years before and one year after a modified resuscitation protocol was implemented, is published online May 4, 2009 in Circulation.