Likelihood of Short-Interval Repeat Computer Tomography Pulmonary Angiogram Yielding a Positive Result

Abstract

Computer Tomography Pulmonary Angiogram (CTPA) has become the standard test to assess for acute pulmonary embolism (PE). Due to their ease of use, there has been concerns about overuse and therefore exposing patients to unnecessary radiation. During hospitalization many patients may undergo a second CTPA to assess for acute PE after an initial negative scan. The goal of our study was to assess the likelihood of a CT scan ordered in under 1 months' time from the initial negative study would be positive for PE.