Una nueva generación de triacetato de celulosa adecuado para hemodiafiltración on-line / A new generation of cellulose triacetate suitable for online haemodiafiltration

Antecedentes: La hemodiafiltración on-line (HDF-OL) es actualmente la técnica de hemodiálisis (HD) más efectiva y aumenta la supervivencia. Hasta el momento presente las membranas de alta permeabilidad con baja pérdida de albúmina como las de polisulfona, poliamida y poliacrilonitrilo son las más utilizadas. Las membranas de triacetato de celulosa (TAC), limitadas inicialmente para su uso en HDF-OL, han evolucionado. El objetivo del estudio fue determinar si las membranas de nueva generación de TAC asimétrico (TACA) son más adecuadas para realizar alto transporte convectivo. Pacientes y métodos: Se estudiaron 16 pacientes, 10 hombres y 6 mujeres, en programa de HDF-OL. A cada paciente se le realizaron 4 sesiones diferentes, con HD o HDF-OL, o con filtros de TAC o TACA de 1,9 m2, aleatorizando el orden. En cada sesión se determinaron concentración de urea, creatinina, β2-microglobulina, mioglobina, prolactina, α1-microglobulina, α1-glicoproteína ácida y albúmina en suero al inicio y al final de cada sesión, para calcular el porcentaje de reducción. Así mismo, se cuantificó la pérdida de solutos y albúmina en el líquido de diálisis. Resultados: Con las membranas de TACA se consiguió un volumen de sustitución en HDF-OL significativamente superior a las membranas de TAC clásicas (32,1±3,1 vs. 19,7±4,5L; p<0,001). En términos de depuración, la eliminación de moléculas pequeñas fue similar con ambas membranas, pero, en moléculas grandes, con HDF-OL la depuración fue mayor con TACA. En HDF-OL, el porcentaje de reducción de la β2-microglobulina se incrementó un 29%, un 27,7% la mioglobina, un 19,5% la prolactina, un 49% la α1-microglobulina, y se duplicó la α1-glicoproteína ácida (p<0,01 en todas las situaciones). La pérdida de albúmina fue inferior a 2 g en todas las situaciones de estudio. Conclusión: Las membranas de TAC de nueva generación han demostrado ser eficaces para alcanzar los objetivos de HDF-OL, sin que haya una mayor pérdida de albúmina (AU)

Background: Online haemodiafiltration (OL-HDF) is currently the most effective dialysis technique that also improves survival. To date, high permeability membranes with low albumin loss, such as polysulfone, polyamide and polyacrylonitrile membranes have been the most widely used. However, the initially restricted use of cellulose triacetate (CTA) membranes in OL-HDF has expanded. The aim of the study was to ascertain whether the latest generation asymmetric CTA membranes are more effective in obtaining high convective transport. Patients and methods: A total of 16 patients (10 males and 6 females) undergoing OL-HDF were studied. Each patient underwent 4 different sessions, with haemodialysis or OL-HDF, and/or with CTA or asymmetric CTA 1.9 m2 membranes. Each session was assigned in a randomised order. Serum levels of urea, creatinine, β2-microglobulin, myoglobin, prolactin, α1-microglobulin, α1-acid glycoprotein and albumin where measured at the beginning and end of each session to obtain the reduction rate. The loss of solutes and albumin was quantified from the dialysate. Results: A significantly greater replacement volume in OL-HDF (32.1±3.1 vs. 19.7±4.5 l, P<.001) was obtained by using asymmetrical CTA membranes compared to conventional CTA membranes. Regarding uraemic toxin removal, both membranes obtained similar results for small molecules, whereas asymmetric CTA membranes achieved better results for large molecules, increasing the reduction ratio by 29% for β2-microglobulin, 27.7% for myoglobin, 19.5% for prolactin, 49% for α1-microglobulin and double for α1-acid glycoprotein (P<0.001 in all situations). The loss of albumin was less than 2g for all treatment sessions. Conclusion: Latest-generation asymmetric CTA have proven to be effective in attaining OL-HDF objectives without increased albumin loss (AU)

A new generation of cellulose triacetate suitable for online haemodiafiltration. / Una nueva generación de triacetato de celulosa adecuado para hemodiafiltración on-line.

BACKGROUND: Online haemodiafiltration (OL-HDF) is currently the most effective dialysis technique that also improves survival. To date, high permeability membranes with low albumin loss, such as polysulfone, polyamide and polyacrylonitrile membranes have been the most widely used. However, the initially restricted use of cellulose triacetate (CTA) membranes in OL-HDF has expanded. The aim of the study was to ascertain whether the latest generation asymmetric CTA membranes are more effective in obtaining high convective transport. PATIENTS AND METHODS: A total of 16 patients (10 males and 6 females) undergoing OL-HDF were studied. Each patient underwent 4 different sessions, with haemodialysis or OL-HDF, and/or with CTA or asymmetric CTA 1.9 m2 membranes. Each session was assigned in a randomised order. Serum levels of urea, creatinine, ß2-microglobulin, myoglobin, prolactin, α1-microglobulin, α1-acid glycoprotein and albumin where measured at the beginning and end of each session to obtain the reduction rate. The loss of solutes and albumin was quantified from the dialysate. RESULTS: A significantly greater replacement volume in OL-HDF (32.1±3.1 vs. 19.7±4.5 l, P<.001) was obtained by using asymmetrical CTA membranes compared to conventional CTA membranes. Regarding uraemic toxin removal, both membranes obtained similar results for small molecules, whereas asymmetric CTA membranes achieved better results for large molecules, increasing the reduction ratio by 29% for ß2-microglobulin, 27.7% for myoglobin, 19.5% for prolactin, 49% for α1-microglobulin and double for α1-acid glycoprotein (P<0.001 in all situations). The loss of albumin was less than 2g for all treatment sessions. CONCLUSION: Latest-generation asymmetric CTA have proven to be effective in attaining OL-HDF objectives without increased albumin loss.