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The principle of BPA. The top of the figure shows the setting of BPA, with a guiding catheter telescoped through an 80 or 90 cm sheath. The bottom of the figure shows cross sections of a vessel before BPA with the obstructing webs (left), with the balloon inflated (middle), and the final result (right). In contrast to coronary intervention, the balloon tears and compresses intraluminal webs and bands without injuring the medial layer of the vessel wall.
