Influence of staple line number and configuration on the leakage of small intestinal functional end-to-end stapled anastomosis: An ex vivo study.

Abstract

To determine the influence of the staple line configuration on the leakage of small intestinal functional end-to-end stapled anastomosis (FEESA). Experimental, ex vivo, randomized study. Jejunal segments (N=72) from 10 mature, canine cadavers. Jejunal segments (10 cm) were randomly assigned to a control group (8 segments) and 4 FEESA groups (16 segments/group (8 constructs/group)), according to the number of rows of staples used in the vertical (V) and transverse lines (T), respectively: Control, 2-row V/2-row T (2V/2T), 2-row V/3-row T (2V/3T), 3-row V/2-row T (3V/2T), 3-row V/3-row T (3V/3T). Initial leak pressure (ILP), maximum intraluminal pressure (MIP), and initial leakage location (ILL) were compared. The ILP (mean ± SD) for control segments, 2V/2T, 2V/3T, 3V/2T and 3V/3T were 321.38 ± 34.59, 32.88 ± 7.36, 50.13 ± 10.46, 34.38 ± 11.78, 69.88 ± 21.23 mmHg, respectively. All FEESAs initially leaked at lower pressures than intact segments. The only other differences detected between groups consisted of ILPs that were higher when FEESAs were closed with 3V/3T (69.88 ± 21.23 mmHg) than 2V/2T (32.88 ± 7.36, P < .001). Initial leakage occurred predominantly from the transverse staple line rather than the anastomotic crotch (P < .001). Placing 3 rows of staples in the transverse line (with or without a third row in the vertical staple line) improved resistance to leakage of FEESAs in normal cadaveric specimens. The addition of a third row of staples in the transverse line (with or without a third row in the vertical staple line) in FEESAs should be further investigated as a strategy to reduce intestinal leakage clinically.