Emergency hospital admissions while on an elective waiting list in England: an observational study using administrative data

Introduction Patients awaiting elective procedures often have conditions that carry a risk of medical emergencies. This study quantifies the extent and variation of emergency hospital admissions during the waiting period across selected specialties and procedures. Methods Data from the NHS England Waiting List Minimum Dataset linked to the Secondary Uses Service hospital admissions data set from 1 January 2022 to 31 December 2023 was analysed. Emergency admissions occurring while patients awaited treatment were identified and categorized from ‘very likely’ related to the index condition or its recognized co-morbid risks—and potentially avoidable through definitive treatment—through to ‘unrelated’. Results In 2023 some 2 093 789 waits (both incomplete and complete) were recorded across 41 selected procedures spanning 11 specialties. Over a combined waiting time of 33 832 790 days, 69 322 emergency admissions occurred, accounting for 535 806 bed days. The highest emergency admission rates per 52 weeks waiting were observed for urinary stent procedures (0.71), endoscopic retrograde cholangiopancreatography (0.63), and urinary catheter care (0.55). Nine procedures had more emergency bed days during the wait than elective bed days post-treatment, with the highest emergency/elective bed day ratios for ureteric stones (4.59), colonoscopy (2.80), and ablation/cardioversion (2.05). Conclusion A substantial number of patients on elective waiting lists are being admitted as emergencies during their wait, placing a burden on emergency care that would be avoided through more timely treatment. The variation in risk between specialties and pathways requires further prioritization strategies that mitigate patients’ risk of associated harm, acting both within and across waiting lists, specialties, and organizations.