Figure 5b. Calculation of PA clot load scores at CT pulmonary angiography in a 70-year-old woman who presented with cardiovascular shock. She underwent fibrinolytic therapy but died of PE 24 hours after admission. Axial CT pulmonary angiograms (displayed from inferior [a] to superior [e]) show multiple clots in the PAs. The PA clot load scores calculated according to Miller et al (45), Walsh et al (46), Qanadli et al (47), and Mastora et al (48) were 94%, 61%, 57%, and 57%, respectively.