Sieving and extraction of peptides and proteins during hemofiltration: a systematic review .

The relationship between the sieving coefficient (SC) or extraction ratio (ER) and the molecular weight (MW) of peptide and protein solutes during hemofiltration has not been investigated; it is possible that the SC and ER correlate with MW, permitting an estimate of peptide and protein clearance by hemofiltration in the absence of empiric data. A search for studies of the SC and/or ER for peptide and protein solutes during hemofiltration identified data for β-microglobulin, brain natriuretic peptide, carperitide, IL-1β, IL-1RA, IL-6, IL-8, lysozyme, myoglobin, neutrophil gelatinase-associated lipocalin, procalcitonin, retinol-binding protein, TNF-α, soluble TNFR-1, soluble TNFR-II, and vasopressin using polyacrylonitrile, polysulfone, polyamide, and cellulose hemofilters. The SC correlated with MW using polyacrylonitrile, polyamide, and cellulose hemofilters. With fewer data, the ER did not correlate with MW using polyacrylonitrile hemofilters, and not enough data were available to assess the ER with any other hemofilters. These results may help predict peptide and protein convective clearance during hemofiltration with polyacrylonitrile, polyamide, and cellulose hemofilters when empiric data are not available.
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