Doctors and nurses may overestimate the quality of the care they provide hospital patients in the hours leading up to a serious complication, according to a small new study. After reviewing the records of 47 patients, Dutch researchers found that for more than half there were delays in recognizing that the patients' conditions were deteriorating in advance of a crisis, such as an unplanned admission to intensive care. Meanwhile nurses, doctors-in-training and specialists reported far fewer delays.