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Related Experiment Videos

Permselectivity of the peritoneal membrane.

B Rippe, M A Perry, D N Granger

    Microvascular Research
    |January 1, 1985
    PubMed
    Summary

    The peritoneal membrane acts as a selective barrier, similar to capillaries, controlling fluid movement during dialysis. Its pore radius is approximately 6 nm, indicating significant restrictive properties.

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    Area of Science:

    • Physiology
    • Nephrology
    • Membrane Transport

    Background:

    • The peritoneal membrane's osmotic barrier properties are crucial for understanding peritoneal dialysis.
    • Previous studies have provided limited data on the peritoneal membrane's behavior under various osmotic conditions.

    Purpose of the Study:

    • To investigate the osmotic barrier characteristics of the peritoneal membrane.
    • To measure transperitoneal fluid movement under conditions simulating peritoneal dialysis.

    Main Methods:

    • Fluid movement was measured in cats using isotonic saline and hypertonic solutions (NaCl, glucose, raffinose, inulin).
    • Osmotic conductances were calculated from water movement and osmotic pressure differences.
    • Peritoneal equivalent pore radius and filtration coefficient were determined.

    Main Results:

    • The average glucose osmotic conductance was 2.3 x 10(-3) ml.min-1.mm Hg-1.m-2 with a glucose osmotic reflection coefficient (sigma) of 0.02.
    • All osmotic conductances fit a peritoneal equivalent pore radius of approximately 6 nm.
    • The peritoneal membrane filtration coefficient was estimated at 0.12 ml.min-1.mm Hg-1.m-2.

    Conclusions:

    • The peritoneum functions as a highly selective membrane.
    • Its restrictive properties are comparable to continuous capillary beds.
    • Understanding these properties is vital for optimizing peritoneal dialysis treatments.

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