Summary of diagnostic performance of perfusion scintigraphy, MR perfusion and CTPA in the diagnosis of CTEPH
| Q scan | MR perfusion* | CTPA | |
|---|---|---|---|
| Sensitivity (%) | 96 (95% CI 0.89% to 0.99%) | 97 (95% CI 0.91% to 0.99%) | 94 (95% CI 0.85% to 0.98%) |
| Specificity (%) | 90 (95% CI 0.77% to 0.97%) | 92 (95% CI 0.80% to 0.97%) | 98 (95% CI 0.88% to 0.99%) |
| Positive predictive value (%) | 94 (95% CI 0.86% to 0.98%) | 95 (95% CI 0.88% to 0.99%) | 99 (95% CI 0.92% to 0.99%) |
| Negative predictive value (%) | 93 (95% CI 0.82% to 0.99%) | 96 (95% CI 0.85% to 0.99%) | 90 (95% CI 0.78% to 0.96%) |
| Accuracy (%) | 94 | 95 | 95 |
*Inter-observer agreement, κ of 0.83.
CTEPH, chronic thromboembolic pulmonary hypertension; CTPA, CT pulmonary angiography.