Article: Outcomes after withholding anticoagulation from patients with suspected acute pulmonary embolism and negative computed tomographic findings: A Cohort study

* Objective: To determine the outcome of withholding anticoagulation from patients with suspected acute pulmonary embolism in whom computed tomographic (CT) findings are interpreted as negative for pulmonary embolism.

Patients and Methods: This retrospective cohort study included 1512 consecutive patients referred from August 7, 1997, to November 30, 1998, for CT because of clinically suspected acute pulmonary embolism. All patients were examined by electron beam CT, and scanning was performed in a cephalocaudad direction from the top of the aortic arch to the base of the heart with 3-mm collimation, 2-mm table incrementation, and an exposure time of 0.2 second (130 peak kV, 620 mA, and ...

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