Table 2 Imaging findings in CTEPH. (PAP = pulmonary artery pressure, PCWP = pulmonary capillary wedge pressure)
Modality | Findings |
|---|---|
Echocardiogram | • PAP > 25 mmHg • Right atrial and right ventricular dilatation • Reduced right ventricular contractility |
Nuclear medicine studies | • Segmental wedge-shaped mismatched defects on perfusion scan |
Right heart catheterization | • PAP is ≥ 25 mmHg • Pulmonary capillary wedge pressure (PCWP) ≤ 15 mmHg • Pulmonary vascular resistance is > 240 dyn-sec-cm-5 |
Invasive and noninvasive pulmonary angiogram | Invasive:  • Stenoses and occlusions Noninvasive:  • Bands, webs, stenoses, and occlusions |
Dual energy CT | CTA portion of study:  • Bands, webs, stenoses, and occlusions Perfusion blood volume of study  • Decreased perfusion in regions of involvement |