[Measuring the thickness of the peritoneum as a dialysis membrane using various osmolar concentrations of dialysis fluid].

Thickness measurements solutions on the rat peritoneum using peritoneum using peritoneal dialysis solutions of various osmolalities show a marked reduction of the distances between capillaries and peritoneal surface with increasing osmolality. This may caused by a dehydration of the peritoneum and support the so-called canaliculus theory. If the dehydration of the peritoneum may outlast temporal the dialysis cycle with higher osmolar solution, it could be an explanation for the efficacy of following low-molecular solutions.