PubMed · 5020960
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M R Camiel, D L Benninghoff. 1972. Renal ectopia and malignancy.. https://pubmed.ncbi.nlm.nih.gov/5020960/
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BACKGROUND: Radiofrequency catheter ablation (RFCA) is a promising intervention to treat atrial fibrillation. However, pulmonary vein (PV) stenosis after RFCA has been reported. The aim of this study was to investigate the incidence and time course of pulmonary vein stenosis after RFCA within a period of 3 months. Contrast-enhanced magnetic resonance angiography (MRA) was used to visualize pulmonary veins and was compared with radiographic angiography. METHODS AND RESULTS: Forty-six consecutive patients with symptomatic paroxysmal atrial fibrillation had RFCA in the orifice of 138 pulmonary veins. Comparison of diameters measured in 44 untreated vessels either by radiographic angiography or with MRA established the reliability of MRA (r=0.934). MRA measurements revealed an incidence of relevant diameter reductions of > or =25% or stenosis of > or =50% after RFCA of 25 of 138 (18.1%) treated vessels 1 day and/or 3 months after ablation. A progression of diameter reduction after RFCA was observed in 8.3% (maximum 75%), whereas a regression was observed in 6.3% of treated PVs. Ablation at a radial angle of >180 degrees of a pulmonary vein orifice increased the risk of diameter reduction significantly compared with ablation at a radial angle < or =180 degrees (P=0.002). CONCLUSIONS: The occurrence and progression of PV stenosis is a potential significant complication of RFCA in the orifice of pulmonary veins. These findings may have an impact on the technical performance of this intervention. In addition, long-term studies will be necessary to evaluate lumen reduction over time. MRA is a noninvasive, reproducible imaging modality for this purpose.
Preoperative evaluation of donors for living-donor liver transplantation aims to select a suitable donor with optimal graft quality and to ensure donor safety. There are minor variations in the donor selection process among different centers, but the safety of the donor remains central to the entire process. The potential donors are evaluated in a stepwise manner including medical, physical, laboratory, psychosocial, and imaging assessment to disqualify unsuitable donors as early as possible in the evaluation process. The main goal of the imaging study is to provide an accurate picture of liver vascular anatomy and liver volume measurement for surgical guidance or for exclusion of unsuitable donors. All imaging studies can now be obtained using noninvasive modalities, thereby decreasing the risk associated with the donor evaluation process. This article describes the donor selection practice in our center including the details of the imaging evaluation.