Balloon pulmonary angioplasty for chronic thromboembolic pulmonary hypertension: State of the art

Figure 6 Representative angiographic images in the right lower lobe. A: Subtotal occlusion lesion before the first balloon pulmonary angioplasty (BPA); B: Improved blood flow with visible venous return after the first BPA; C: Spontaneously dilated vessels with increased blood flow before the second BPA; D: Increased blood flow after the second BPA.