The peritoneal response to expanded polytetrafluoroethylene and oxidized regenerated cellulose surgical adhesion barriers.

OBJECTIVE

To determine the peritoneal response to the surgical adhesion barriers expanded-polytetrafluoroethylene (ePTFE) and oxidized regenerated cellulose (ORC).

STUDY

DESIGN

The barriers were retrieved from the peritoneal cavities of women and mice 2 hours to 14 days after insertion and subjected to histology and electronmicroscopy.

RESULTS

Macrophages and mesothelial cells rapidly appeared on the surface of both materials. ePTFE was covered by 3 days, with the macrophages gradually being replaced by mesothelium and disappearing thereafter. By 7 days, a delicate membrane with surface mesothelial cells completely enveloped the ePTFE, creating a "pseudoperitoneum". The membrane was difficult to recover as it was fragile and not adherent to the ePTFE. ORC was rapidly infiltrated and degraded by leukocytes and disappeared by 5 days in mice and from all but 1 of 20 women by 11 days.

CONCLUSIONS

ePTFE is rapidly encapsulated by a non-adherent membrane resembling peritoneum while ORC is rapidly infiltrated and degraded by peritoneal fluid leukocytes.