No document will be able to cover every potential situation. For this reason, living wills are often not worth the paper they’re printed on; if there is anything about the situation that isn’t addressed in the document, and there always will be, then the family is right back to making the decisions that you’re trying to keep them from having to make.
A health care power of attorney (or whatever they’re called in your state) is a much stronger option. The HCPOA gives clear authority to someone to make decisions regarding your care when you are unable to do so. As the name implies, it applies only to health care decisions; power of attorney for financial matters, etc., is a totally different document.
My suggestion would be for you and your sister to declare one another as HCPOA, with backups in the event that she cannot make the decision for you. I would include some extremely general language in the document about your wishes, but nothing that limits the decisions she would be able to make.
After this is done, the important thing is making sure that she understands your wishes. Some specific issues that you might want to discuss:
–In what circumstances do you want to be intubated and mechanically ventilated? This is probably the big one, since when this decision needs to be made, it must be made fairly quickly. Ventilation is usually temporary, unless you are already in the latter stages of a disease, but most people (IME) would not want to go on the machine at all if there were little or no chance that they would ever come off and breathe on their own again.
–Similarly, in what circumstances would you want drugs used or withheld that would sustain a fatally dropping blood pressure (aka “pressors”)? I won’t get into a detailed discussion of what these drugs do, but if they are being used, it means that you are extremely sick and your recovery will probably be lengthy and demanding.
–If your heart stopped or went into a fatal rhythm, in what situations do you want attempts at resuscitation to be withheld? This would include chest compressions, electricity, and various drugs.
–If you were unresponsive and ventilated and clearly not improving or getting worse, at what point would you want the ventilator stopped?
–Similarly, if you were unresponsive and clearly not improving or getting worse, with no sign that you might improve anytime soon, would you want a feeding tube placed?
–What do you consider to be a tolerable quality of life?
Unless there are specific interventions you are uncomfortable with, I would think of these things very generally. For instance–I am young and healthy, so if I am collapsing in any way, I want everything done. If I am brain dead, don’t even think about keeping me alive. If I could return to a reasonable quality of life, then push on; if the best I can hope for is to be totally dependent on others for my basic needs, or if I would not be able to eat, or read, or do the other basic things that bring me everyday pleasure, then I’m not interested.
You have to trust your HCPOA to make these decisions for you, but ultimately someone is going to be making them, living will or not. This allows you to name someone to have the final say and to make sure that person understands your wishes.
I’m sure there is a good book on all this, but I don’t know of one to recommend.