The effect of platelet-rich plasma on intra-abdominal adhesions in rabbit uterine horn model

OBJECTIVE

This study was carried out to investigate the effect of autologous platelet-rich plasma (PRP) on intra-abdominal adhesion at the cesarean section incision line in the uterus.

MATERIAL AND METHODS

As experimental animals 16 white New Zealand rabbits, 5-months-old, unmated, were used. Animals were divided into two groups the control group and PRP application group. In each group, a transverse incision was made to the uterus to mimic the cesarean section and sutured. Relaparotomy was performed 21 days after the first operation.

RESULTS

When the groups were evaluated in terms of inflammation, there was a significant difference between the two groups. When the groups were evaluated in terms of Mason's Trichrome staining and fibrosis, There was a significant difference between groups. When the groups were evaluated in terms of vascular endothelial growth factor-1, there was also a significant difference between the groups. In an experimental rabbit uterine horn adhesion model, PRP is effective in preventing post-operative adhesion formation.

CONCLUSIONS

This result may guide clinical studies using autologous PRP to prevent post-operative adhesion formation after gynecological operations.

Topical Application of High-Dose Mesna Prevents Adhesion Formation: An Experimental Animal Study

BACKGROUND

Adhesion formation is a common complication of abdominal surgeries. Mesna is a drug with fibrinolytic properties which has been used in surgical field to facilitate tissue dissection. The aim of this experimental animal study was to investigate the effect of mesna on prevention of intra-abdominal adhesion in rats.

MATERIALS AND METHODS

Twenty-eight Wistar albino rats were used in the study. To create abdominal adhesion, cecum was abraded in all rats. No additional surgical procedure was performed other than adhesion in group 1 (only adhesion). In the other groups, rats were treated topically by administering 0.9% saline (group 2), 40 mg/kg mesna (group 3), and 400 mg/kg mesna (group 4). All rats were sacrificed on postoperative 21st day. Histopathological and macroscopic evaluations of adhesion formation were performed.

RESULTS

Quantity of adhesion scores (P = 0.022), severity of adhesion scores (P = 0.041), total adhesion scores (P = 0.023), and histopathological adhesion grading scores (P < 0.001) were reduced by 400 mg/kg mesna.

CONCLUSIONS

This is the first study for mesna on prevention of abdominal adhesion formation in rats. We concluded that dose-dependent reduction of adhesion was achieved by mesna. With future studies, topical administration of mesna during open abdominal surgeries may be used to prevent adhesion formation.

A carboxymethylcellulose-heparin combination for the prevention of surgical adhesions

BACKGROUND

Adhesions are a major clinical problem after abdominal surgery. Despite decades of research, therapies to prevent adhesion formation are suboptimal.

MATERIALS AND METHODS

We have investigated combinations of carboxymethylcellulose (CMC) and heparin at preventing surgical adhesions in two rat models of adhesion formation. The first was the well-established cecal abrasion model, and the second was a model developed in our laboratory, the avascular mesenteric knot model. This model consistently produced adhesions at the knot in 90% of experiments and causes little or no tissue injury.

RESULTS

Topical administration of CMC 4% gave optimal results in the avascular knot model, but was less effective in the cecal abrasion model. This concentration of CMC was combined with a range of heparin doses between 0.5 and 160 IU/mL in the cecal abrasion model. These heparin doses, apart from the lowest (0.5 IU/mL), were effective in preventing adhesion formation in combination with CMC, as was the commercially available topical product Lipactin. The optimal dose was 30 IU/mL, that abolished adhesions, but there was little difference at doses between 2 and 160 IU. Heparin was effective in doses as low as 2 IU/mL when in combination with CMC. Heparin 160 IU/mL, but not heparin 30 IU/mL or Lipactin, significantly increased the degree of bleeding post cecal abrasion surgery.

CONCLUSIONS

Topical application of tiny doses of heparin, in combination with CMC 4% gel, significantly reduces adhesion formation in experimental models. We suggest that this cheap and, as far as we know, safe intervention should be evaluated in human clinical trials.

Imaging the postoperative patient: long-term complications of gastrointestinal surgery

OBJECTIVES

The objectives of this review are (1) to become acquainted with the long-term complications of surgery of the gastrointestinal tract, and (2) to appreciate the appropriate use of imaging in the assessment of long-term complications.

BACKGROUND

Gastrointestinal tract surgery comprises a group of procedures performed for a variety of both benign and malignant diseases. In the late postoperative setting, adhesions and internal hernias are the most important complications. and they can be further complicated by volvulus and ischemia. At present, computed tomography (CT) is the workhorse for evaluating late postoperative complications. Accurate imaging assessment of patients is essential for adequate treatment planning.

IMAGING FINDINGS OR PROCEDURE DETAILS

In this pictorial essay we will review the most frequent long-term complications after gastrointestinal surgery, including adhesions, afferent loop syndrome, closed-loop obstruction, strangulated obstruction, internal hernias, external hernias, anastomotic strictures and disease recurrence. Examples will be depicted using iconography from the authors' imaging department.

CONCLUSIONS

Knowledge of the most frequent complications after gastrointestinal surgery in the late postoperative period is of paramount importance for every radiologist, so that potentially life-threatening situations can be promptly diagnosed and adequate therapy can be planned.

TEACHING POINTS

• Long-term postoperative complications of gastrointestinal tract surgery can be divided into procedure-related and disease-related categories. • The most common procedure-related complications are internal hernias and adhesions. • The most frequent disease-related complications are mainly associated with neoplastic or inflammatory recurrence. • Computed tomography is the most useful examination when such complications are suspected.

Intestinal obstruction due to bezoars: a retrospective clinical study

PURPOSE

The purpose of this study was to compare the results of surgical procedures applied to rare intestinal obstruction cases due to bezoars and to identify effective factors for determining the type of surgical procedure to be applied.

METHODS

The records of 62 patients who had received gastrointestinal surgical treatment due to bezoars were assessed retrospectively. The preoperative characteristics, perioperative findings and postoperative results of cases that had and had not undergone an enterotomy were compared

RESULTS

The average patient age was 57.7 years (range, 26-84 years), and all patients had phytobezoars, except one. The most common location for bezoars was the jejunum (28 cases, 45.1 %). Sixteen cases (25.8 %) had multiple bezoars located in different parts of the gastrointestinal tract. While milking was applied to 26 cases (41.9 %) with small intestinal bezoars, an enterotomy was used to remove bezoars in 23 cases (37 %). More complications tended to be identified in patients who underwent an enterotomy; however, the difference was not significant (p = 0.553).

CONCLUSIONS

The frequency of previous abdominal surgery in patients suffering from an intestinal obstruction due to bezoars causes diagnostic conflict. The location of bezoars in the small intestine should also be considered when deciding the surgical procedure, as well as the physical properties of the bezoars. Our opinion is that conducting the milking procedure should not be insisted on, and that an enterotomy should be conducted when necessary.