In the event a person is in a coma, who is empowered to make medical decisions according to a durable power of attorney?

The designated agent chosen by the principal is the correct choice because a durable power of attorney specifically allows an individual, referred to as the principal, to appoint another person to make medical decisions on their behalf in the event that they become incapacitated, such as in a coma. This arrangement ensures that the principal's preferences and wishes regarding medical treatment are honored when they are unable to communicate them personally.

This empowerment is formalized through the legal document created by the principal, which clearly outlines who can make decisions and under what circumstances, thereby providing clarity and authority to the designated agent.

Other options, while potentially involved in the decision-making process, do not have the same legal standing granted by a durable power of attorney. The healthcare facility's ethics committee may provide guidance but does not have the authority granted by the principal unless directed by a legal document. Similarly, while a spouse may be a logical choice for such decisions, the power of attorney may designate someone else entirely. The principal's physician is responsible for providing medical care and advice but does not hold decision-making power over the patient's treatment choices unless specifically designated by the durable power of attorney.