Interruptions and other work system failures often prevent nurses from completing essential patient care tasks. This study, a secondary analysis of data from a seminal article, found that failure to complete nursing care was linked to an increased risk of a broad range of adverse events. This finding is corroborated by another recent study that tied interruptions during medication administration to an increased risk of medication errors. While inadequate nurse staffing ratios increase safety risks, this study reinforces the necessity of also transforming nurses' work environment in order to reduce preventable adverse events.