Abstract
Congenital stenosis of the pulmonary artery (PA) branches is an anomaly characterised by narrowed segments of one or more of the main or peripheral branches, and is commonly treated with balloon angioplasty or stenting. In patients with unilateral PA stenosis, the expected relationship between stenosis and reduced flow does not always appear to hold true. In our clinical experience, we have observed in some cases an equal flow between right and left PAs (RPA and LPA) despite the stenosis, or even higher flow in favour of the stenotic side. This may be explained by a mismatch in the distal pulmonary vascular resistance (PVR) between the two lungs [Cohn, 1976]. Patient-specific data and computational modelling were used to estimate PVR and understand the fluid dynamics in these patients before and after stent implantation.
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