On this page: About the National Data | Methodology | History
About the National Data
Baseline: 40.2 percent of bystanders performed CPR for all non-traumatic cardiac arrests in 2020
Target: 45.1 percent
Percentage point improvement
CARES case: A non-traumatic out-of-hospital cardiac arrest event where resuscitation is attempted by a 911 responder (CPR and/or defibrillation). This includes patients that received an automated external defibrillator (AED) shock by a bystander prior to the arrival of 911 responders.
Active bystander CPR: Cardiopulmonary resuscitation by a lay person in an attempt to restore spontaneous circulation by performing chest compressions with or without ventilation. It excludes patients that go into cardiac arrest after the arrival of a 911 provider since this would not be a situation that a bystander would be able to intervene. It also does not include patients that experience their cardiac arrest in a nursing home or medical facility where trained providers would be able to initiate CPR.
Numerator and denominator exclude 911 responder-witnessed events.
In 2021, this objective was revised due to the creation of a new cohort by the data source, CARES. The baseline was revised from 38.2% in 2017 to 40.2% in 2020. The target was revised from 43.1% to 45.1% using the original target setting method.
1. Effect size h=0.1 was chosen to correspond with 10% improvement from a baseline of 50%.