Comparison of initial leak pressures after single- and double-layer cystotomy closure with barbed and nonbarbed monofilament suture material in an ex vivo ovine model.

OBJECTIVE: To compare initial leakage pressure after double-layer inverting and single-layer appositional closures with unidirectional barbed suture or an analogous monofilament absorbable suture in an ex vivo ovine model.

STUDY DESIGN: Experimental study.

SAMPLE POPULATION: Ovine cadaveric bladders (n = 48).

METHODS: A 4-cm ventral cystotomy was performed in each bladder. Bladders were randomly divided into 4 groups (n = 12 each group) and sutured in an open setting with a single-layer appositional or a double-layer inverting pattern of unidirectional 2-0 barbed or an analogous monofilament suture. Intraluminal pressure at initial leakage and leakage location were recorded. Analysis of variance was used to compare initial leak pressure between the 4 groups (P < .05).

RESULTS: Ovine urinary bladders closed with double-layer inverting closures leaked at intraluminal pressures about twofold greater than bladders closed with single-layer appositional closures (P < .0001) whether barbed or nonbarbed suture was used (P ≥ .987). Bladders most commonly leaked at the suture hole after single-layer closure. Bladders that had been repaired with a double-layer closure leaked at the knot in nonbarbed closures or at the preconstructed end loop in barbed closures.

CONCLUSION: Double-layer closure increased leakage pressures compared with single-layer closures, irrespective of the suture type used.

CLINICAL SIGNIFICANCE: This study provides evidence to support double-layer rather than single-layer closure of cystotomies in clinical cases. The use of barbed suture may be suitable for cystorrhaphy in sheep.