I do not think anyone will be able to provide the specifics regarding the treatment of the patient you mention. In general, the quality of medical care in this country is dependent on several factors.
1) Which medical facility you end up at
2) If you arrive in a state where you can communicate your treatment wishes
3) The equipment/doctors/medicines available at the time you present
All hospitals, public and private are supposed to provide life sustaining care for anyone that arrives at their door. Whether they do or not, whether they are compelled to do that or not I can't say for certain.
If you can speak, give instructions, offer a payment method or give instructions to be transferred to a more appropriate facility, you may make out better than if you are just a lump of unidentified, unresponsive and presumed uninsured flesh.
If you have health insurance, always carry the card (or a copy) with you. Have a short written contact list with one or two people the authorities can contact in your wallet. Those contacts should understand your treatment wishes, and have access to your insurance details. I also used to carry a short set of instructions about my primary care if I arrive unable to communicate that should remove any doubt that I am prepared and able to pay, I wish to have my life prolonged until either myself or my family can give further instructions and that I am not allergic to any medications.
What I finally decided was the best solution for me - I purchased a generic medicalert bracelet and neck chain offering an answering service capable of communicating in Spanish for a fixed lifetime fee. The jewelry does not look as if it is made from gold, is clearly identifiable as being purposed as a medicalalert notification. My profile contains my contacts, my insurance details, and my basic current medical history - what drugs I am taking, what conditions I suffer from and my medical instructions until family can get involved. Hopefully the good Samaritans will overlook this jewelry as being of no value when they safeguard my wallet, shoes, cellphone and cash and human dignity.