Effects of inferior splenic lobe pole fixation and gastrosplenic peritoneal membrane section on the vitality of the remanent of subtotal splenectomy in rats

Study of the upper pole after subtotal splenectomy in rats

PURPOSE

To evaluate macro/microscopic viability of the upper pole (UP) in rats after 80 days of subtotal splenectomy preserving the upper pole (SSPUP).

METHODS

Twenty-five male Wistar rats were submitted to SSPUP. After 80 days, the rats were euthanized, and the remaining UP was evaluated macroscopically regarding appearance, color, consistency, length, width, thickness, and presence of fibrosis/necrosis; and microscopically regarding presence of red and white pulp, fibrosis/necrosis.

RESULTS

Two rats died during surgery and were removed from the statistical analysis. There was statistically significant increase in length and width between the pre and postoperative in the experimental group, with no significant difference in thickness. In the manipulation group, the macroscopic appearance of the spleen was normal in pre and postoperative, with viability preserved. In the experimental group, two UP of the spleen were not found during the second surgery. Macroscopically, it was observed absence of fibrosis and necrosis in all cases. Microscopically, the white and red pulp were intact in both groups. Two spleens of rats in the manipulation group presented areas with fibrosis and necrosis focus, which were not enough to be considered inviable.

CONCLUSIONS

The UP of the spleen remained viable in 91.3% of the cases.

Macro and microscopic comparison of the upper pole of the spleen with the lower pole in partial splenectomy

Purpose

To evaluate the viability of the upper (UP) and lower pole (LP) of the spleen from a macro and microscopic point of view, after subtotal splenectomy with preservation (SSP) of the UP and the LP.

Methods

Seventeen male Wistar rats, two months old, were submitted to SSPUP and SSPLP and 5 to simulated operation (SG). After 80 days, the rats were euthanized, and the remaining LP and UP and intact spleens were evaluated macroscopically and microscopically.

Results

Two rats died during the operation. Macroscopic analysis showed that in 15 LP, one of them was not viable and in 15 UP and in 5 spleens in the SG, all were viable. In the statistical analysis, there was no difference in relation to viability. The LP and UP analyzed showed variation. As for the length, the UP increased significantly; however, in relation to the width, there was a significant increase in the LP in relation to the UP. In addition, the weight of the UP was significantly greater than that of the LP. Microscopic analysis attested viability of the splenic remnants.

Conclusion

There was no significant difference regarding the viability of UP and LP, in macroscopy and microscopy.

INFLUENCE OF SPLENIC IMPLANTS IN THE SUBCUTANEOUS TISSUE ON ASPLENIC ANIMALS SURVIVAL

Background:

The best site for splenic implant was not defined, mainly evaluating the functionality of the implant.

Aim:

To evaluate the effects of autogenous splenic implantation on the subcutaneous tissue in the survival of splenectomized rats.

Method:

Twenty-one randomly assigned rats were studied in three groups (n=7): group 1 - manipulation of the abdominal cavity and preservation of the spleen; group 2 - total splenectomy; group 3 - splenectomy and implant of the tissue removed in the subcutaneous. The animals were followed for 90 days postoperatively.

Results:

There was a higher mortality in groups 2 (p=0.0072) and 3 (p=0.0172) in relation to group 1. There was no difference between groups 2 and 3 (p=0.9817).

Conclusion:

The splenic implant in the subcutaneous is ineffective in the survival of rats submitted to splenectomy.