Preventing Emergency Readmissions to Hospital: A Scoping Review.

This article reviews the evidence and potential for use of "emergency readmissions within 28 days of discharge from hospital" as an indicator within the NHS Outcomes Framework. It draws on a rapid review of systematic reviews, complemented by a synopsis of work in four countries designed to better understand current patterns of readmissions and the interpretation of observed patterns. Reviewed studies suggest that between 5 percent and 59 percent of readmissions may be avoidable. Studies are highly heterogeneous, but based on the evidence reviewed, about 15 percent up to 20 percent may be considered reasonable although previous authors have advised against producing a benchmark figure for the percentage of readmissions that can be avoided. The majority of published studies focus on clinical factors associated with readmission. Studies are needed of NHS organisational factors which are associated with readmission or might be altered to prevent readmission. The introduction of new performance indicators always has the potential to produce gaming. Observers from the USA cite experience which suggests hospitals might increase income by admitting less serious cases, thus simultaneously increasing their income and reducing their rate of readmission. There is also the possibility that there may be some shift in coding of admissions between "emergency" and "elective" depending on the incentives. If hospitals are performance managed on the basis of readmission rates, it would be reasonable to expect that some behaviour of this type would occur.