New York state just issued a drastic new guideline urging emergency-services workers not to bother trying to revive anyone without a pulse when they get to a scene, amid an overload of coronavirus patients. While paramedics were previously told to spend up to 20 minutes trying to revive people found in cardiac arrest, the change is “necessary during the COVID-19 response to protect the health and safety of EMS providers by limiting their exposure, conserve resources, and ensure optimal use of equipment to save the greatest number of lives,’’ according to a state Health Department memo issued last week. First-responders...