A retrospective review of sildenafil in the Australia and New Zealand Fontan registry: indications and treatment responses

Fig. 1. Bar graphs demonstrating A) the effect of sildenafil commencement on the index indication B) PVRi at commencement on resolution of index indication. Fontan failure only denotes those individuals who did not have an invasive assessment. Improvement was defined as being before and after treatment with sildenafil.