The aim is to keep people who are likely to die out of hospitals, which are expected to soon be overwhelmed with COVID-19 patients as the pandemic worsens https://www.latimes.com/california/story/2020-04-04/l-a-county-911-patients-hospital-coronavirus

The policy, which could apply to 911 patients with heart attacks and drug overdoses, as well as those with COVID-19, instructs first responders to wait and see whether a patient loses heart function again within five minutes after being revived https://www.latimes.com/california/story/2020-04-04/l-a-county-911-patients-hospital-coronavirus

If so, paramedics will continue CPR in the field until a doctor tells them to stop because it is likely futile. CPR could continue for as long as 40 minutes, according to county officials https://www.latimes.com/california/story/2020-04-04/l-a-county-911-patients-hospital-coronavirus