Understanding and extending the Starling principle

Published on Apr 27, 2020in Acta Anaesthesiologica Scandinavica2.105
路 DOI :10.1111/AAS.13603
C. Charles Michel18
Estimated H-index: 18
(ICL: Imperial College London),
Tom Woodcock12
Estimated H-index: 12
Fitz Roy E Curry60
Estimated H-index: 60
(UC Davis: University of California, Davis)
The Starling Principle states that fluid movements between blood and tissues are determined by differences in hydrostatic and colloid osmotic (oncotic) pressures between plasma inside microvessels and fluid outside them. The Revised Starling Principle recognizes that, because microvessels are permeable to macromolecules, a balance of pressures cannot halt fluid exchange. In most tissues, steady oncotic pressure differences between plasma and interstitial fluid depend on low levels of steady filtration from plasma to tissues for which the Revised Principle provides the theory. Plasma volume is normally maintained by fluid losses from filtration being matched by fluid gains from lymph. Steady state fluid uptake into plasma only occurs in tissues such as intestinal mucosa and renal peri-tubular capillaries where a protein-free secretion of adjacent epithelia contributes significantly to interstitial fluid volume and keeps interstitial oncotic pressure low Steady filtration rates in different tissues are disturbed locally by reflex changes in capillary pressure and perfusion. The rapid overall decline in capillary pressure after acute blood loss initiates rapid fluid uptake from tissue to plasma, i.e. autotransfusion. Fluid uptake is transient, being rapid at first then attenuating but low levels may continue for more than an hour. The Revised Principle highlights the role of oncotic pressure of small volumes of interstitial fluid within a sub-compartment surrounding the microvessels rather than the tissue's mean interstitial fluid oncotic pressure. This maximizes oncotic pressure differences when capillary pressure are high and enhances initial absorption rates when pressures are low, accelerating short term regulation of plasma volume. EDITORIAL COMMENT: In this special article, which is one of a pair of invited narrative reviews, the author group focuses on review and reassessment of the model for fluid movement between capillary plasma and tissue, including recent developments in thinking.
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