Developing a new experimental model of abdominal compartment syndrome.

OBJECTIVE To describe an experimental, unprecedented model that mimics the abdominal compartment syndrome (ACS). METHODS twenty rats were randomly divided into four groups. To simulate ACS intra-abdominal hypertension (IAH) was induced by inserting cotton surgical dressing (Zobec ®), 15x15cm (intra-abdominal pressure constant and equal to 12 mmHg) associated with hypovolemia induced by withdrawing blood, keeping mean arterial pressure (MAP) around 60 mmHg (HYPO). To dissociate the effects of those IAH-induced hypovolemia per se, two other groups were analyzed: one with only with IAH and another with only hypovolemia. The simulation group (sham) underwent the same surgical procedure performed earlier, however, the levels of intra-abdominal pressure and MAP were kept in 3 mmHg and 90 mmHg, respectively. RESULTS By analyzing the impact of IAH on the small intestine, we observed necrosis of the villi, congestion, and neutrophilic infiltration. Hypovolemia induced only inflammation and edema of the villi. However, the association of IAH and HYPO led to hemorrhagic infarction, besides worsening of the aforementioned parameters. CONCLUSION This model was effective in inducing ACS expressed by the effects found in the small intestine.