Comput Math Methods Med - Finite volume scheme for double convection-diffusion exchange of solutes in bicarbonate high-flux hollow-fiber dialyzer therapy.

Tópicos

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Resumo

The efficiency of a high-flux dialyzer in terms of buffering and toxic solute removal largely depends on the ability to use convection-diffusion mechanism inside the membrane. A two-dimensional transient convection-diffusion model coupled with acid-base correction term was developed. A finite volume technique was used to discretize the model and to numerically simulate it using MATLAB software tool. We observed that small solute concentration gradients peaked and were large enough to activate solute diffusion process in the membrane. While CO(2) concentration gradients diminished from their maxima and shifted toward the end of the membrane, HCO(3)(-) concentration gradients peaked at the same position. Also, CO(2) concentration decreased rapidly within the first 47 minutes while optimal HCO(3)(-) concentration was achieved within 30 minutes of the therapy. Abnormally high diffusion fluxes were observed near the blood-membrane interface that increased diffusion driving force and enhanced the overall diffusive process. While convective flux dominated total flux during the dialysis session, there was a continuous interference between convection and diffusion fluxes that call for the need to seek minimal interference between these two mechanisms. This is critical for the effective design and operation of high-flux dialyzers.

Resumo Limpo

effici highflux dialyz term buffer toxic solut remov larg depend abil use convectiondiffus mechan insid membran twodimension transient convectiondiffus model coupl acidbas correct term develop finit volum techniqu use discret model numer simul use matlab softwar tool observ small solut concentr gradient peak larg enough activ solut diffus process membran co concentr gradient diminish maxima shift toward end membran hco concentr gradient peak posit also co concentr decreas rapid within first minut optim hco concentr achiev within minut therapi abnorm high diffus flux observ near bloodmembran interfac increas diffus drive forc enhanc overal diffus process convect flux domin total flux dialysi session continu interfer convect diffus flux call need seek minim interfer two mechan critic effect design oper highflux dialyz

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