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Sets of multiple indicator dilution curves were obtained from working hearts of dogs with closed chests. A multiple capillary adaptation of a permeability- limited capillary model which assumes that exchanging material returns to the capillary at its site of escape was tested on these curves. The model has only two lumped parameters: a permeability surface product per accessible extravascular volume, and flow per extravascular volume. Labeled red cells and albumin were used as vascular indicators. The model provided close fits for the curves of diffusion-limited indicators (sucrose, inulin, sulfate, sodium, chloride, and urea), and unique valueswere obtained for both parameters. The accessible extravascular volume obtained by this method was independent of flow whereas the permeability surface product per accessible extravascular volume (a relatively low value for these indicators) increased with flow. In this first group the outflow patterns varied with the size of the test molecule. For a second group of substances (water, ethanol and antipyrine), the outflow patterns were virtually identical and independent of molecular size (i.e., flow- limited). The modeling did not provide an appropriate description of these curves, and analysis indicated that the exchanging indicator may intercom- municate between capillaries in a random fashion, i.e., that the indicator may not return to each capillary at the same site at which it escaped.

Transcapillary Exchange En the Working Left Ventricle of the Dog