Choosing your HCP (health care proxy) is such an important part of your advance directive, that needs to be filled out before a medical crisis.
If you decide not to assign a HCP, here are a few things that may occur, when you are unable to speak, and make medical decisions, for yourself:
Taking the time to fill out your advance directive, along with assigning your proxy, will bring confidence that if you are in a medical crisis, you will receive the care you wish to have, and not those whom might enforce their values on your medical care.
"If you have not completed a Health Care Proxy, your family may be asked to make decisions based upon what they believe you would want done. If you have no family, or if there is disagreement about what treatment you would want, a court may be asked to appoint a guardian to make those decisions on your behalf".