Toxinas unidas a proteínas: valor añadido en su eliminación con altos volúmenes convectivos / Protein-bound toxins: added value in their removal with high convective volumes

La enfermedad renal crónica tiene mayor riesgo de eventos cardiovasculares. En los últimos años, han ido adquiriendo mayor importancia las toxinas unidas a proteínas, que han sido asociadas a mayor morbimortalidad y que se caracterizan por la dificultad para su depuración en diálisis. El objetivo de este estudio es valorar la influencia de altos volúmenes convectivos en HDF-OL posdilucional sobre la eliminación de medianas moléculas, pequeñas moléculas y moléculas unidas a proteínas. Material y métodos: Se realizaron 40 sesiones de HDF-OL posdilucional en 13 pacientes y se midió el porcentaje de reducción de toxinas de distinto peso molecular y entre ellas, moléculas unidas a proteínas como el p-cresyl sulfato, indoxyl sulfato y homocisteína. Resultados: El volumen convectivo total fue de 28,3(5,1) litros con un rango entre 16,3 y 38,0 litros. La reducción media de moléculas unidas a proteínas fue de 44,4 (15,7) % para el p-cresyl sulfato, de 48,7(14,1) % para el indoxyl sulfato y de 58,6(8,8) % para la homocisteína. Además, se encontró una relación directa y estadísticamente significativa entre el porcentaje de reducción de las tres moléculas con el volumen de sustitución y con el Kt/V. Conclusión: Altos volúmenes convectivos totales en HDF-OL en posdilución se asocian a una mayor eliminación de toxinas urémicas unidas a proteínas (AU)

Chronic kidney disease is associated with an increased risk of cardiovascular events. In recent years, protein-bound toxins have become more important due to their association with increased morbidity and mortality, characterised by inadequate clearance during dialysis. The purpose of this study is to assess the influence of high convective volumes on postdilution online haemodiafiltration (OL-HDF) on the removal of medium-sized molecules, small molecules and protein-bound molecules. Material and methods: In forty postdilutional OL-HDF sessions, the reduction rates of toxins of different molecular weights were measured in 13 patients, including protein-bound molecules such as p-cresyl sulphate, indoxyl sulphate and homocysteine. Results: Total convective volume was 28.3 (5.1) litres (range 16.3-38.0 litres). Mean reduction rate of protein-bound molecules was 44.4% (15.7%), 48.7% (14.1%) and 58.6% (8.8%) for p-cresyl sulphate, indoxyl sulphate and homocysteine, respectively. Moreover, a statistically significant direct association was found between the reduction rates of all three molecules, the replacement volume and the Kt/V. Conclusion: High convective volumes during postdilution OL-HDF are associated with increased removal of protein-bound uraemic toxins (AU)

Protein-bound toxins: added value in their removal with high convective volumes. / Toxinas unidas a proteínas: valor añadido en su eliminación con altos volúmenes convectivos.

Chronic kidney disease is associated with an increased risk of cardiovascular events. In recent years, protein-bound toxins have become more important due to their association with increased morbidity and mortality, characterised by inadequate clearance during dialysis. The purpose of this study is to assess the influence of high convective volumes on postdilution online haemodiafiltration (OL-HDF) on the removal of medium-sized molecules, small molecules and protein-bound molecules. MATERIAL AND METHODS: In forty postdilutional OL-HDF sessions, the reduction rates of toxins of different molecular weights were measured in 13 patients, including protein-bound molecules such as p-cresyl sulphate, indoxyl sulphate and homocysteine. RESULTS: Total convective volume was 28.3 (5.1) litres (range 16.3-38.0 litres). Mean reduction rate of protein-bound molecules was 44.4% (15.7%), 48.7% (14.1%) and 58.6% (8.8%) for p-cresyl sulphate, indoxyl sulphate and homocysteine, respectively. Moreover, a statistically significant direct association was found between the reduction rates of all three molecules, the replacement volume and the Kt/V. CONCLUSION: High convective volumes during postdilution OL-HDF are associated with increased removal of protein-bound uraemic toxins.