Predictive value of blood flow in the gastric tube in anastomotic insufficiency after thoracic esophagectomy

Anastomotic insufficiency is considered to be one of the most serious complications associated with esophageal reconstruction. The purposes of this study were to identify (1) the relationship between anastomotic insufficiency and tissue blood flow (TBF) in the gastric tube in the perioperative period, and (2) the effects of intravenous prostaglandin E1 (PGE1) on TBF in the gastric tube. The study group consisted of 44 patients who were to undergo esophagectomy for esophageal cancer. Intraoperative and postoperative TBF on the serosal side of the gastric tube were measured by laser-Doppler tissue blood flowmetry. The TBF of the Leakage(+) group (n=5) was poorer than that of the Leakage(−) group (n=39) during the intraoperative and postoperative periods. There was a significant difference in TBF between the two groups at postoperative day (POD) 3. There was a tendency in the PGE1(+) group (n=18) to exhibit richer blood flow through the anastomosis than the PGE1(−) group (n=26), intraoperatively, but the difference was not significant. Two of five Leakage(+) cases were also in the PGE11(+) group. There was no relationship between intraoperative medication with PGE1 and incidence of leakage. The TBF of three-field lymph node dissection and reconstruction of the retrosternal route group (n=21) was poorer than that of the two-field lymph-node dissection and reconstruction of the posterior mediastinal route group (n=23). The TBF in the gastric tube after esophagectomy may be a predictor of anastomotic insufficiency. However, PGE1 treatment in the intraoperative period alone is not effective in preventing anastomotic insufficiency.RésuméLa fistule anastomotique après anastomose oesophagienne est une des complications les plus sévères. Les buts de cette étude ont été d’identifier: (1) dans la période postopératoire, les rapports entre la fistule anastomotique et le débit sanguin des tissus (DST) du tube gastrique, (2) les effets de la prostaglandine E1 (PGE1) administrée en intraveineux sur le DST du tube gastrique. Le groupe d’étude a comporté 44 patients ayant eu une œsophagectomie pour cancer de l’œsophage. Le DST a été mesuré au niveau de la séreuse du tube gastrique par une débitométrie sanguine au laser-Doppler en peropératoire et en postopératoire. Le DST mesuré en peropératoire et en postopératoire a été plus faible dans le groupe avec fistule (+) (n=5) que dans le groupe sans fistule (−) (n=39). Au jour postopératoire 3, la différence observée du DST des deux groupes a été significative. On a noté une tendance dans le groupe PGE1(+) (n=18) à un débit plus élevé à travers l’anastomose que dans le groupe PGE1(−) (n=26), en peropératoire, mais cette difference n’était pas significative. Deux des cinq cas de fistule (+) étaient dans le groupe PGE1(+). Il n’y avait aucun rapport entre la prise de PGE1 peropératoire et l’incidence de fistule. Le DST après oesophagectomie par trois champs et reconstruction par voie rétrosternale (n=21) était moins bon que celui de l’oesophagectomie par deux champs et reconstruction par voie médiastinale postérieure (n=23). Le DST du tube gastrique après oesophagectomie pourrait être un facteur prédictif de fistule anastomotique. Cependant, le traitement par PGE, pendant la période peropératoire seul n’est pas efficace dans la prévention de fistule anastomotique.ResumenLa complicación más grave de las reconstrucciones esofágicas es la insuficiencia o fuga anastomótica. Los objetivos de este trabajo fueron: (1) establecer las relaciones existentes, durante el periodo perioperatorio, entre la insuficiencia o fuga anastomótica y el flujo sanguíneo tisular (TBF) del tubo gástrico, (2) averiguar los efectos de la administración intravenosa de prostaglandina E1 (PGE1) en el TBF del tubo gástrico. Estudiamos 44 pacientes esofagectomizados por cáncer. Utilizando un flujómetro sanguíneo textura! tipo Laser-Doppler se midió, en el periodo tanto intra como postoperatorio, el TBF en la serosa del tubo gástrico. Durante estos periodos el TBF, en el grupo insuficiencia o fuga anastomótica (+) n=5 fue menor que en el grupo sin insuficiencia (−) n=39. Se constató al tercer día del postoperatorio (POD) una diferencia muy significativa del TBF entre ambos grupos. Se registró en el grupo PGE1 (+) (n=18) en relación con el grupo PGE1 (−) (n=26) una tendencia no significativa por lo que a un mayor flujo sanguíneo textural, a través de la anastomosis, se refiere. Dos de las 5 insuficiencias anastomóticas se registraron en el grupo PGE1 (+). No hubo relación alguna entre la administración intraoperatoria de PGE1 y la frecuencia de la dehiscencia. El TBF en tres áreas ganglionares tras disección y reconstrucción retroesternal (n=21) fue menor, que en dos áreas anglionares tras disección y reconstrucción mediastínica posterior (n=23). El TBF del tubo gástrico es un factor pronóstico válido de la dehiscencia o fuga anastomótica. El tratamiento intraoperatorio con PGE, no es eficaz en la prevención de la misma.

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