Jornal Vascular Brasileiro
https://jvascbras.org/article/doi/10.1590/1677-5449.190117
Jornal Vascular Brasileiro
Original Article

Estudo experimental comparativo da resistência tensional da safena magna no tornozelo e na região inguinal

Experimental comparative assay of tensile resistance of greater saphenous vein from ankle and groin

Carlos Eduardo Del Valle; Marcio Miyamotto; Jorge Rufino Ribas Timi

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Resumo

Resumo: Contexto: A veia safena magna é usada como material de remendo em vários tipos de reconstrução arterial, incluindo no trauma e endarterectomias de carótida e femoral. Houve relatos de ruptura do remendo de safena, particularmente de veias colhidas na região do tornozelo. Há uma necessidade de medição objetiva da resistência tecidual da safena magna.

Objetivos: Mensurar a força tensional suportada pela veia safena magna e analisar a correlação entre resistência e diâmetro da veia.

Métodos: As veias foram coletadas durante operações de safenectomia por varizes dos membros inferiores. Foram analisados apenas segmentos sem refluxo. Foram analisados 10 membros de oito pacientes, com um total de 20 espécimes. Os espécimes foram submetidos a ensaio de tração em equipamento eletrônico, obtendo-se os valores de tensão máxima do material em quilogramas-força por centímetro quadrado (kgf/cm2; força máxima dividida pela área de secção transversa do segmento submetido à tração).

Resultados: A tensão máxima suportada pela veia safena do tornozelo variou de 74,02 a 190,10 kgf/cm2, e a tensão máxima da veia safena da crossa variou de 13,53 a 69,45 kgf/cm2 (p < 0,0001). O coeficiente de correlação de Pearson entre o diâmetro da veia distendida e a tensão máxima suportada foram iguais a -0,852 (correlação inversa moderada a forte).

Conclusões: A resistência tecidual da veia safena magna do tornozelo é maior do que a da crossa em mulheres submetidas a operação de varizes; há correlação negativa entre o diâmetro da veia e sua resistência tecidual nessa mesma população.

Palavras-chave

veia safena, varizes, lesões do sistema vascular, procedimentos cirúrgicos vasculares

Abstract

Background: The great saphenous vein is used as patch material in several types of arterial reconstruction, including trauma and carotid and femoral endarterectomy. There have been reports of saphenous patch blowout, particularly of patches constructed with veins harvested from the ankle. There is a need for objective measurement of the resistance of saphenous vein tissues. Objectives: To measure the tensile strength of the great saphenous vein harvested at the ankle and groin and analyze the correlation between diameter and tissue strength. Methods: Venous samples were harvested during elective saphenous stripping in patients with symptomatic varicose veins. Only segments without reflux were included. Ten limbs from eight patients were studied, providing 20 samples in total. Venous segments were opened along their longitudinal axis and fitted to electronic traction assay equipment to obtain values for material maximum tension in kilograms-force per square centimeter (kgf/cm2 ; the maximum force resisted by the segment, divided by its cross-sectional area). Results: The average maximum tension in the ankle saphenous vein group ranged from 74.02 to 190.10 kgf/cm2 and from 13.53 to 69.45 kgf/cm2 in the groin saphenous vein group (p < 0.0001). The Pearson coefficient for the correlation between vein diameter and maximum tension was -0.852 (moderate to strong inverse correlation). Conclusions: Ankle saphenous vein tissue from female patients operated for varicose veins has significantly higher resistance than saphenous vein tissue from the groin and there is an inverse relation between vein diameter and resistance of tissue from the same population.

Keywords

saphenous vein; varicose veins; vascular system injuries; vascular surgical procedures.

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Submitted date:
09/05/2019

Accepted date:
10/31/2019

60d4c7f1a9539505d147bc53 jvb Articles

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