Microvascular anastomoses in growing vessels: a long-term evaluation of nonabsorbable suture materials.

Diametric growth at the anastomotic site, following microvascular anastomoses in pediatric patients, remains a problem, when nonabsorbable suture material is used. This study investigated the long-term effects of femoral artery anastomoses with nonabsorbable sutures in 20 growing rats with a mean weight of 101 g. The right femoral artery was anastomosed with 10-0 polypropylene monofilament suture and the left with identical nylon suture, using 5 to 6 interrupted sutures for each end-to-end anastomosis. At a 6-month harvest, the mean body weight had increased by 729 percent and the diameter of the femoral artery by 240 percent. The patency rate at the anastomotic sites was 97.5 percent and the complication rate was 10 percent, including one occlusion and three aneurysm formations at the sites. Angiography, diameter measurement, and histology demonstrated no stenosis or thrombus formation in all animals. Histology also showed normal vessel lumen size and well-organized re-endothelialization, without intimal hyperplasia at the anastomosis sites. With an interrupted suture technique, nonabsorbable sutures do not compromise growth at the anastomosis site or long-term patency of the anastomosed vessels. This study indicates that interrupted nonabsorbable suture materials are able to create excellent long-term results in microvascular anastomoses in rapidly growing hosts.