Every estate plan should include a Durable Power of Attorney for Medical Care Decisions, sometimes called a "Living Will."
This document lets you name one or more people, in order, to make medical care decisions for your spouse, if your spouse cannot make them due to mental or physical incapacity.
The person your spouse names can make any medical care decision they could make as long as it is medically reasonable and only if your spouse cannot make the decision. They can make routine decisions like "what are you going to have for lunch after surgery" up to and including decisions regarding life sustaining treatment.
The people your spouse names should:
1. Care about them.
2. Be able to make decisions at what may be a difficult time emotionally.
3. Be able to make the decision that your spouse would want them to make.
Your spouse can name up to (3) different people, in order, to make medical decisions. Your spouse may want to name you as their first choice.