11/29/2023 0 Comments Interstitial fluid definition![]() Transvascular fluid filtration coefficients calculated from this data were 5.5 (SI) and 4.5 ml mmHg -1 kg -1min -1 (PI), and interstitial compliance was 11.8 (SI) and 9.7 ml mmHg -1 kg -1 (PI). Thus the presence of plasma proteins delayed fluid efflux from the vasculature, but did not affect the volume lost. Volume recovery after PI was also mono-exponential, but slower (half-time=15.4 min) than SI, whereas the steady-state Vp (27.3 ml kg -1) was similar and 30% of the injected volume remained in the vasculature. Vp declined mono-exponentially after SI with a half-time of 6.8 min and Vp reached a new steady state at 28.1 ml kg -1 30%of the injected volume remained in the vasculature. Plasma volume ( Vp)was calculated from an assumed blood volume of 35 ml kg -1 and the Hct. In group 2, 20% or 35% of the blood volume was removed, and in group 3, 35% of the blood volume was removed. Fish in group 1 were volume expanded by injecting a volume of saline (0.9 g% NaCl SI) or trout plasma (PI) equivalent to 40% of the plasma volume. Hematocrit (Hct) was monitored in unanesthetized fish either manually, by collecting blood from the extracorporeal loop at 5 min intervals for a period of 1 h (groups 1 and 2),or continuously (instantaneously) with an impedance flow-cell inserted in the aortic cannula (group 3). The following day a peristaltic pump was fitted to complete the extracorporeal arterio-venous circulation. ![]() Cannulae were placed in the dorsal aorta (DA) and caudal vein (CV) of rainbow trout Oncorhynchus mykiss (mass 0.45-0.85 kg) and the fish spleenectomized. The kinetics of transvascular fluid transport across fish capillaries and redistribution of fluids between intravascular compartments in intact fish are unknown.
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