Most patients died because of the effects of severe head injury (63.4%), followed by exsanguination (17.6%).
(exsanguination = verbloeding)
Incidence and etiology of mortality in polytrauma patients in a Dutch level I trauma center.
El Mestoui Z, Jalalzadeh H, Giannakopoulos GF, Zuidema WP.
Eur J Emerg Med. 2015 Jul 29.