This study compared outcomes of patients admitted to general intensive care units (ICUs) versus specialty ICUs for specific conditions like heart attacks or pneumonia. The study analyzed data on over 84,000 patients from 124 ICUs. It found that admission to an "ideal" specialty ICU matched to a patient's condition did not generally provide a survival benefit compared to general ICU care. However, admission to a "non-ideal" specialty ICU, or boarding, was associated with higher risk-adjusted mortality. The results suggest specialty ICUs may not necessarily improve survival outcomes.