Table 18-8.
Estimated Overall Annual Incidence of EMS-Treated OHCA Between 2008 and 2015 in the ROC Epistry
| Incidence Rates per 100 000 Person-Years | ||||||||
|---|---|---|---|---|---|---|---|---|
| 2008 | 2009 | 2010 | 2011 | 2012 | 2013 | 2014 | 2015 | |
| EMS treated | 47.1 | 57.7 | 59.9 | 61.6 | 62.9 | 64.9 | 68.1 | 66 |
| Initial rhythm VT/VF | 9.8 | 11.9 | 12.4 | 13 | 13.8 | 13.2 | 14.4 | 13.5 |
| Bystander-witnessed VT/VF | 5.7 | 6.9 | 7.4 | 7.7 | 7.8 | 7.3 | 8.4 | 7.5 |
The Resuscitation Outcomes Consortium (ROC) maintained an epidemiological registry to describe the process and outcome of care for patients with OHCA, as well as to augment the efficiency of randomized trials of interventions in such patients. For several years, ROC has used data from this registry to estimate the burden of cardiac arrest for the American Heart Association. The methods used to estimate incidence in this registry have changed over time, as census data changed. As well, the methods changed as the completeness of reporting by census tract evolved over time. As such, previously reported incidence rates are not directly comparable from year to year nor with the rates presented here. The treated cardiac incidence rates shown in the Table were calculated using the subset of ROC EMS agencies from 7 US sites that participated continuously from 2008 to 2015. Previous calculations, and those in Table 18-2, used all ROC agencies that participated during the respective year. Methods of calculation have been modified over time.
Technical notes: The total yearly population of the ground footprint covered by these agencies has been adjusted from the 2000 and 2010 US census to account for yearly population increases. Arrest location is collected by ROC agencies as the location of the arrest, not the home residence of the patient who experiences the cardiac arrest. The population represents the number of people who live within the ground footprint and does not account for people who commute into the area during business hours. The ground footprint represents all census tracts where an ROC agency arrives and treats a patient even if there is not full ROC coverage within the tract.
EMS indicates emergency medical services; OHCA, out-of-hospital cardiac arrest; VF, ventricular fibrillation; and VT, ventricular tachycardia.
Source: ROC Investigators, unpublished data, July 7, 2016.