To the Editor: In their study of in-hospital cardiac arrests, Dr Peberdy and colleagues1 found lower survival rates during nights and weekends. Similarly, patients admitted on weekends for acute myocardial infarction have been found to have a significantly higher mortality compared with patients admitted on weekdays.2 Nights and weekends share several potentially harmful factors, such as lower surveillance levels; less availability of trained medical staffing, ancillary personnel, important medical services, and common urgent procedures; and reduced psychophysical performance. This plausible interpretation is mainly focused on the health care workers or structures.
Manfredini R, Salmi R, Manfredini F. Survival Patterns With In-Hospital Cardiac Arrest. JAMA. 2008;299(22):2625-2627. doi:10.1001/jama.299.22.2625-a