Helical computed tomography versus pulmonary arteriography in pulmonary embolism

Harry J.A. Henteleff; John W. Drover

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Table 1

Sensitivity, Specificity and Predictive Values of Dual-Section Helical Computed Tomography in the Diagnosis of Pulmonary Embolism Based on Selective Pulmonary Arteriography as the Reference Standard

Patient group	Sensitivity, % (and no. /total no. of pts)	Specificity, % (and no. /total no. of pts)	Predictive value, % (and no. /total no. of pts)
Patient group	Sensitivity, % (and no. /total no. of pts)	Specificity, % (and no. /total no. of pts)	Positive	Negative
All patients	90 (56/62)	94 (89/95)	95 (56/59)	97 (89/92)

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Table 2
Study Data From Which Likelihood Ratios for Pulmonary Embolism Were Calculated
Test results (CT scan) Reference standard (arteriogram)
Disease present Disease absent
Disease present 56 (a) 6 (b)
Disease absent 6 (c) 89 (d)