Silver Book Fact
3.3% of patients admitted to a hospital for cardiovascular disease died in the hospital–significantly higher than the average in-hospital death rate of 2.1%.
Russo C, Ho K, Elixhauser A. Hospital Stays for Circulatory Diseases, 2004. H-Cup Statistical Brief. 2007; 26. http://www.hcup-us.ahrq.gov/reports/statbriefs/sb26.pdf