Septic shock reduces intestinal microcirculation and anastomotic perfusion: A porcine laser speckle contrast imaging...

Septic shock disrupts systemic and organ-specific microcirculation, leading to poor tissue perfusion and impaired healing. While mesenteric hemodynamics have been studied, the impact of sepsis on intestinal microcirculation and anastomotic healing remains unclear.

To assess the short-term effects of septic shock on microcirculation in the small intestine and colon, with a focus on hand-sewn and stapled anastomoses, using laser speckle contrast imaging (LSCI).

Ten pigs underwent midline laparotomy with the creation of four anastomoses: One hand-sewn and one stapled anastomosis in both the small intestine and colon. LSCI measurements were taken before anastomosis formation (T_B), immediately after (T_A), and after one hour of rest (T₀). Septic shock was induced via intravenous Escherichia coli infusion, with subsequent LSCI measurements at 30-minute intervals (T₃₀-T₁₅₀). Results were expressed as relative changes compared to T_B.

Septic shock significantly reduced microcirculation in both untouched intestine and anastomoses. Hand-sewn anastomoses consistently exhibited higher perfusion than stapled anastomoses. At T₁₅₀, perfusion in hand-sewn anastomoses remained significantly higher than in stapled anastomoses (51% vs 34% of T_B, P = 0.002).

This study shows that septic shock significantly impairs intestinal microcirculation indicating a risk of intestinal ischemia if bacteriaemia and subsequent septic shock is untreated. Due to diminish blood flow following septic shock, the anastomotic healing may be compromised leading to increased risk of anastomotic leakage. Conclusively, this study provides a foundation for optimizing surgical strategies and improving patient outcomes in this high-risk population.