Listen in as Catherine Bree Johnston, MD, Palliative Care provider at Skagit Regional Health, discusses advance directives, why they're important, the different types of directives and more. Catherine Johnston, MD practices Palliative Care at Skagit Regional Health. She received her MD from the University of California School of Medicine and is board certified by the American Board of Internal Medicine. Dr. Johnston sees patients at Skagit Valley Hospital.