Advance medical directive is a general term for any document you use to give instructions on the medical treatments you would want or not want under particular conditions. You can also use an advance directive to choose someone to make medical treatment decisions for you if you can't make or communicate those decisions yourself. The two main types of advance directives in the United States are living wills and medical powers of attorney. You can change your advance medical directives at any time and even revoke them completely. Your current wishes, provided that you are able to express them and understand the consequences of treatment decisions, take priority over written or recorded expressions of your medical treatment goals.  That includes both advance medical directives and your advance care plan created using MyDirectives.