Utilization of CT Pulmonary Angiography in Suspected Pulmonary Embolism in a Major Urban Emergency Department

Table 1

Wells’ simplified clinical prediction model.

Parameter	Points
Clinical symptoms or signs of deep vein thrombosis (DVT)	3
Heart rate > 100 beats per minute	1.5
Immobilization (for 3 or more days) or surgery in the last 4 weeks	1.5
Previous history of DVT or PE	1.5
Hemoptysis	1
Malignancy (diagnosed in the last 6 months, under active or palliative treatment)	1
Alternative diagnosis less likely than PE (based on presenting history, physical examination, CXR, EKG, and ABG)	3
Clinical probability of PE	Score
Low	<2
Moderate	2–6
High	>6