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The '''Starling equation''' is an equation that illustrates the role of [[hydrostatic pressure|hydrostatic]] and [[oncotic pressure|oncotic]] forces (the so-called '''Starling forces''') in the movement of fluid across [[capillary|capillary membranes]]. {{Clarify|date=July 2012}}


Capillary fluid movement may occur as a result of three processes:
* [[diffusion]]
* [[filtration]]
* [[pinocytosis]]


Starling's equation only refers to fluid movement across the capillary membrane that occurs as a result of filtration. In the glomerular capillaries, there is a net fluid filtration of 125 ml/min (about 180 litres/day). In the rest of the body's capillaries, there is a total net transcapillary fluid movement of 20 ml/min (about 28.8 litres/day) as a result of filtration. This is several orders of magnitude lower than the total diffusional water flux at the capillary membrane, as that is about 80,000 litres/day{{cn|date=December 2012}}.
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The Starling equation was formulated in 1896 by the British physiologist [[Ernest Starling]], also known for the [[Frank–Starling law of the heart]].
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==The equation==
 
[[Image:StarlingEquation.svg|thumb|350px| Diagram of the Starling model, as used in the main text. Note that the concentration of interstitial solutes (orange) increases proportionally to the distance from the arteriole.]]The Starling equation reads as follows:
 
:<math>\ J_v = K_\mathrm{f} ( [P_\mathrm{c} - P_\mathrm{i}] - \sigma[\pi_\mathrm{c} - \pi_\mathrm{i}] )</math><ref>{{cite book|last=West|first=John|title=Respiratory Physiology : the essentials – 9th edition|year=2012|publisher=Lippincott Williams & Wilkins|location=Baltimore|isbn=978-1-60913-640-6|page=177}}</ref>
 
where:{{anchor|variables}}
 
* <math> J_v </math> is the net fluid movement between compartments.
* <math> [P_\mathrm{c} - P_\mathrm{i}] - \sigma[\pi_\mathrm{c} - \pi_\mathrm{i}] </math> is the net driving force,
** ''P''<sub>c</sub> is the capillary [[hydrostatic pressure]]
** ''P''<sub>i</sub> is the interstitial hydrostatic pressure
** ''π''<sub>c</sub> is the capillary [[oncotic pressure]]
** ''π''<sub>i</sub> is the interstitial oncotic pressure
** ''K''<sub>f</sub> is the filtration coefficient – a proportionality constant
** ''σ'' is the reflection coefficient
 
By convention, outward force is defined as positive, and inward force is defined as negative.  The solution to the equation is known as the net filtration or net fluid movement (''J''<sub>''v''</sub>). If positive, fluid will tend to ''leave'' the capillary (filtration). If negative, fluid will tend to ''enter'' the capillary (absorption). This equation has a number of important physiologic implications, especially when pathologic processes grossly alter one or more of the variables. Note that previously it was believed that at steady state the arterial capillaries filter fluid and the venous capillaries reabsorb it, as shown by the diagram. Though many physiology textbooks still use this misconception, modern evidence shows that in most cases venular blood pressure exceeds the opposing pressure, thus maintaining a positive outward force. This indicates that capillaries are normally in a state of filtration along their entire length.<ref>Levick J.R., Introduction to Cardiovascular Physiology. Oxford Press, 2003, pp. 179–180.</ref>
 
Pressures are often measured in [[mmHg|millimetres of mercury]] (mmHg), and the filtration coefficient in millilitres per minute per millimetre of mercury (ml·min<sup>&minus;1</sup>·mmHg<sup>&minus;1</sup>).
 
In essence the equation says that the net filtration (''J''<sub>''v''</sub>) is proportional to the net driving force. The first four variables in the list above are the forces that contribute to the net driving force.
 
===Filtration coefficient===
The '''filtration coefficient''' is the constant of proportionality. A high value indicates a highly water permeable capillary. A low value indicates a low capillary permeability.
 
The filtration coefficient is the product of two components:
* capillary surface area
* capillary hydraulic conductance
 
===Reflection coefficient===
The '''reflection coefficient''' is often thought of as a correction factor. The idea is that the difference in oncotic pressures contributes to the net driving force because most capillaries in the body are fairly impermeable to the large molecular weight proteins. (The term ''[[ultrafiltration]]'' is usually used to refer to this situation where the large molecules are retained by a semipermeable membrane but water and low molecular weight solutes can pass through the membrane).
 
Many body capillaries do have a small permeability to proteins (such as [[albumins]]). This small protein leakage has two important effects:
* The [[interstitial fluid]] oncotic pressure is higher than it would otherwise be in that tissue
* Not all of the protein present is effective in retaining water so the ''effective capillary oncotic pressure'' is lower than the measured capillary oncotic pressure.
 
Both these effects decrease the contribution of the oncotic pressure gradient to the net driving force. The reflection coefficient (σ) is used to correct the magnitude of the measured gradient to 'correct for' the ineffectiveness of some of the oncotic pressure gradient. It can have a value from 0 up to 1.
 
* [[Glomerular capillaries]] have a reflection coefficient close to 1 as normally no protein crosses into the glomerular filtrate.
 
* In contrast, [[hepatic sinusoids]] have a low reflection coefficient as they are quite permeable to protein. This is advantageous because albumin is produced in [[hepatocytes]] and can relatively freely pass from these cells into the blood in the sinusoids. The predominant pathway for albumin and other proteins to enter the circulation is via the lymph.
 
===Approximated values===
Following are approximated values for the variables in the equation for both arterioles and venules:
 
{| class="wikitable"
|-
!Location
!''P''<sub>c</sub> (mmHg)<ref name=boron> {{cite book |author=Walter F., PhD. Boron |title=Medical Physiology: A Cellular And Molecular Approaoch |publisher=Elsevier/Saunders |location= |year= |pages= |isbn=1-4160-2328-3 |oclc= |doi=}} </ref>
!''P''<sub>i</sub> (mmHg)<ref name=boron/>
!''σπ''<sub>c</sub> (mmHg)<ref name=boron/>
!''σπ''<sub>i</sub> (mmHg)<ref name=boron/>
|-
| [[arteriole|arteriolar]] end of [[capillary]] || +35 || &minus;2 || +28 || +0.1
|-
| [[venule|venular]] end of capillary || +15 || &minus;2 || +28 || +3
|}
Some albumin escapes from the capillaries and enters the interstitial fluid where it would produce a flow of water equivalent to that produced by a hydrostatic pressure of +3 mmHg. Thus, the difference in protein concentration would produce a flow of fluid into the vessel at the venous end equivalent to 28&nbsp;−&nbsp;3&nbsp;=&nbsp;25&nbsp;mmHg of hydrostatic pressure. The total oncotic pressure present at the venous end could be considered as&nbsp;+25&nbsp;mmHg.
 
In the beginning (arteriolar end) of a [[capillary]], there is a net driving force (<math> [P_\mathrm{c} - P_\mathrm{i}] - \sigma[\pi_\mathrm{c} - \pi_\mathrm{i}]</math>) outwards from the capillary of +9 mmHg. In the end (venular end), on the other hand, there is a net driving force of&nbsp;&minus;8 mmHg.
 
Assuming that the net driving force declines linearly, then there is a mean net driving force outwards from the capillary as a whole, which also results in that more fluid exits a capillary than re-enters it. The [[lymphatic system]] drains this excess.
 
==Clinical usefulness==
 
The principles behind the equation are considered useful for explaining physiological phenomena happening at the capillary (e.g. the formation of edema), but the impossibility of easily measuring all six variables together in actual patients makes it more difficult to apply it in daily pracitce.{{Citation needed|date=April 2010}}
 
Research data has suggested that the Starling equation may not accurately reflect physiological processes at a capillary level, and that it needs to be modified to include the role of the [[glycocalyx]].<ref>{{cite journal|last=Woodcock|first=T. E.|coauthors=Woodcock, T. M.|title=Revised Starling equation and the glycocalyx model of transvascular fluid exchange: an improved paradigm for prescribing intravenous fluid therapy|journal=British Journal of Anaesthesia|date=29 January 2012|volume=108|issue=3|pages=384–394|doi=10.1093/bja/aer515|pmid=22290457|url=http://bja.oxfordjournals.org/content/108/3/384}}</ref>
 
==See also==
* [[Glomerular filtration rate#Calculation using Starling equation]]
 
==References==
<references />
 
==External links==
* [http://physioweb.med.uvm.edu/bodyfluids/isf-plas.htm Overview at physioweb.med.uvm.edu]
* [http://www.cvphysiology.com/Microcirculation/M012.htm Overview at cvphysiology.com]
 
[[Category:Equations of fluid dynamics]]
[[Category:Physiology]]

Latest revision as of 04:40, 2 October 2014


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