New York-Presbyterian Hospital, whose centers and clinics provide about 20% of the healthcare in New York, is the first large institution to move beyond the pilot stage this week as it begins to offer consumer-controlled health records for patients. New York-Presbyterian has been working with Microsoft for more than a year, not only on technical matters but also ease-of-use concerns with patients. The introduction will be gradual, beginning with heart patients, who will be told of the potential benefits of personal health records when they visit a NewYork-Presbyterian hospital or outpatient clinics.