More than 59% of the 300,000 people who die from venous thromboembolism in the U.S. each year have undetected pulmonary embolism.
Heit, JA, AT Cohen, and FA Anderson Jr.; for the VTE Impact Assessment Group. Estimated Annual Number of Incident and Recurrent, Non-Fatal and Fatal Venous Thromboembolism (VTE) Events in the U.S. Blood. 2005; 106(11): abstract #910:267a. http://abstracts.hematologylibrary.org/cgi/content/abstract/106/11/910?maxtoshow=&hits=10&RESULTFORMAT=&fulltext=Estimated+Annual+Number+of+Incident+and+Recurrent%2C+Non-Fatal+and+Fatal+Venous+Th&searchid=1&FIRSTINDEX=0&sortspec=relevance&resourcetype=HWC