National Trends in Patient Safety for Four Common Conditions, 2005–2011

N Engl J Med: January 23, 2014


Changes in adverse-event rates among Medicare patients with common medical conditions and conditions requiring surgery remain largely unknown.


We used Medicare Patient Safety Monitoring System data abstracted from medical records on 21 adverse events in patients hospitalized in the United States between 2005 and 2011 for acute myocardial infarction, congestive heart failure, pneumonia, or conditions requiring surgery. We estimated trends in the rate of occurrence of adverse events for which patients were at risk, the proportion of patients with one or more adverse events, and the number of adverse events per 1000 hospitalizations. Read More