Pulmonary embolism occurred in 47 patients ( 1.3 % ) and was associated with body mass index ( hazard ratio , 1.37 ; 95 % CI , 1.02-1 .83 ; p = 0.035 ) and vasopressor use ( hazard ratio , 1.84 ; 95 % CI , 1.01-3 .35 ; p = 0.046 ) .