Paramedics still classify a person with no heartbeat as "dead". This is also part of the reason consent to restore life to someone at this stage is not required. At least that is the training I get a couple times a year from paramedics.
If I detect breathing or a heart beat, I am required to tap you a couple times and ask if it's ok for me to assist you. If you can't respond, consent is still implied. If you respond with anything suggesting "no", then I am to leave you alone and notify emergency personnel that you declined help.
If I am permitted to help, (you give consent or can not respond), then I must only do things that are within my training. If I step outside the line, such as administering a miracle pill (from Miracle Max), then I am liable for resulting damages. If I stay within my training, then I am protected legally.