title: Protein osmotic pressure gradients and microvascular reflection coefficients.
abstract: Microvascular membranes are heteroporous, so the mean osmotic reflection coefficient for a microvascular membrane (sigma d) is a function of the reflection coefficient for each pore. Investigators have derived equations for sigma d based on the assumption that the protein osmotic pressure gradient across the membrane (delta II) does not vary from pore to pore. However, for most microvascular membranes, delta II probably does vary from pore to pore. In this study, we derived a new equation for sigma d. According to our equation, pore-to-pore differences in delta II increase the effect of small pores and decrease the effect of large pores on the overall membrane osmotic reflection coefficient. Thus sigma d for a heteroporous membrane may be much higher than previously derived equations indicate. Furthermore, pore-to-pore delta II differences increase the effect of plasma protein osmotic pressure to oppose microvascular fluid filtration.
authors.affiliation: Department of Anesthesiology, University of Texas-Houston Medical School 77030, USA.
authors.forename: R E
authors.initials: RE
authors.lastname: Drake
authors.forename: S
authors.initials: S
authors.lastname: Dhother
authors.forename: R A
authors.initials: RA
authors.lastname: Teague
authors.forename: J C
authors.initials: JC
authors.lastname: Gabel
mesh_terms: D000818:Animals; D001798:Blood Proteins / Q000378:metabolism*; D002199:Capillary Permeability; D004487:Edema / Q000378:metabolism; D006801:Humans; D008833:Microcirculation; D008955:Models, Cardiovascular; D009997:Osmotic Pressure
chemical_list: D001798:Blood Proteins