Academic Journal
The endothelial glycocalyx affords compatibility of Starling's principle and high cardiac interstitial albumin levels
| العنوان: | The endothelial glycocalyx affords compatibility of Starling's principle and high cardiac interstitial albumin levels |
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| المؤلفون: | Jacob, Matthias, Bruegger, Dirk, Rehm, Markus, Stoeckelhuber, Mechthild, Welsch, Ulrich, Conzen, Peter, Becker, Bernhard F. |
| بيانات النشر: | Oxford University Press |
| سنة النشر: | 2007 |
| المجموعة: | HighWire Press (Stanford University) |
| مصطلحات موضوعية: | Original Article |
| الوصف: | Objective: To test the role of an oncotic pressure gradient across the endothelial glycocalyx with respect to extravasation of fluid and colloids and development of tissue edema in a whole organ setting. Methods: We measured filtration in the intact coronary system of isolated guinea pig hearts, comparing colloid-free perfusion and perfusion with 1.67% albumin or 2% hydroxyethylstarch (oncotic pressures 5.30 vs. 11.10 mm Hg, respectively). Heparinase was used to alter the endothelial glycocalyx. Results: Extremely high net organ hydraulic conductivity was obtained with colloid-free perfusion (9.14 µl/min/g tissue). Supplementing perfusate with albumin caused a significant decrease, also vs. hydroxyethylstarch (1.04 vs. 2.67 µl/min/g, p <0.05). Albumin also lowered edema formation vs. the other perfusion modes ( p <0.05). Stripping the glycocalyx of heparan sulfate reduced the effect of colloids, especially that of albumin. The steady-state concentrations of hydroxyethylstarch and albumin in the mixed interstitial fluid leaving the intact coronary bed averaged about 95% of the intravascular level. Electron and light microscopy indicated that colloid extravasated mainly in the venular sections. Conclusion: We propose a low-filtration model for the coronary system with different barrier properties in arteriolar/capillary and venular sections. Arteriolar/capillary: very little fluid and colloid extravasation due to the endothelial surface layer formed by the glycocalyx and albumin plus the endothelial strand barrier; venular: little net extravsation of fluid and colloids despite large pores, because of low hydrostatic and oncotic pressure differences between intra- and extravascular spaces. The latter sites provide physiological access of large solutes (colloids) to the tissue. |
| نوع الوثيقة: | text |
| وصف الملف: | text/html |
| اللغة: | English |
| Relation: | http://cardiovascres.oxfordjournals.org/cgi/content/short/73/3/575; http://dx.doi.org/10.1016/j.cardiores.2006.11.021 |
| DOI: | 10.1016/j.cardiores.2006.11.021 |
| الاتاحة: | http://cardiovascres.oxfordjournals.org/cgi/content/short/73/3/575 https://doi.org/10.1016/j.cardiores.2006.11.021 |
| Rights: | Copyright (C) 2007, European Society of Cardiology |
| رقم الانضمام: | edsbas.CC9772DC |
| قاعدة البيانات: | BASE |
| DOI: | 10.1016/j.cardiores.2006.11.021 |
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