Safety of preoperative branch embolization in patients undergoing evar / Segurança da embolização pré-operatória do ramo em pacientes submetidos a evar

Abstract The purpose of this systematic review is to evaluate the safety of pre-endovascular abdominal aortic aneurysm repair (EVAR) embolization of aortic side branches - the inferior mesenteric artery and lumbar arteries. Preferred Reporting Items for Systematic Reviews and Meta-Analysis guidelines were followed. A search of MEDLINE and DIMENSION databases identified 9 studies published from 2011 to 2021 that satisfied the inclusion and exclusion criteria. These studies were analyzed to detect the incidence of embolization-related complications. A total of 482 patients underwent preoperative aortic side branch embolization, 30 (6.2%) of whom suffered some kind of minor complication. The only major complication observed was ischemic colitis in 4 (0.82%) patients, two (0.41%) of whom died after bowel resection surgery. Regarding these findings, aortic side branch embolization seems to be a safe procedure, with very low percentages of both minor and major complications.

Resumo O objetivo desta revisão sistemática foi avaliar a segurança da embolização de artéria mesentérica inferior (AMI) e artérias lombares (ALs) pré-correção endovascular de aneurisma da aorta abdominal. Foram realizadas pesquisas nas bases de dados MEDLINE e Dimensions. Foram encontrados 9 estudos publicados de 2011 a 2021 que atendiam aos critérios de inclusão e exclusão. Os estudos foram analisados ​​para definir a incidência de complicações relacionadas à embolização. No total, 482 pacientes foram submetidos a embolização de AMI e/ou ALs, dos quais 30 (6,2%) sofreram algum tipo de complicação menor. A única complicação importante observada foi colite isquêmica em 4 (0,82%) pacientes. Dois (0,41%) desses pacientes morreram após cirurgia de ressecção intestinal. Em relação a esses achados, a embolização de AMI e ALs parece ser um procedimento seguro, com um percentual muito baixo de complicações menores e importantes.

Arterias sigmoideas: bases para una nueva clasificación / Sigmoid arteries: bases for a new classification

Las arterias sigmoideas son ramas de la arteria mesentérica inferior e irrigan al colon sigmoideo. Se originan del tronco de las arterias sigmoideas. Esta es la descripción más frecuente según los autores consultados. El objetivo fue analizar las variaciones en el origen y distribución de las arterias sigmoideas mediante disección. Se utilizaron 13 preparados cadavéricos formolizados al 10 %. Se disecó la cavidad abdominal para identificar a las arterias sigmoideas. Se evidenció su bifurcación paralela al colon sigmoideo. Se lo delimitó mediante reparos palpables. Patrón I: 4 casos (30,8 %). Variante de la arcada sigmoidea como rama colateral de la arteria mesentérica inferior. Tipo Ia: 1 caso (25 %). Sin asociaciones. Tipo Ib: 1 caso (25 %). Asociada al tronco sigmoideo. Tipo Ic: 2 casos (50 %). Asociada a arterias sigmoideas accesorias. Patrón II: 6 casos (46,2 %). Variante del tronco común entre arteria cólica izquierda y arterias destinadas al colon sigmoideo. Tipo IIa: 3 casos (50 %). Sin asociaciones. Tipo IIb: 2 casos (33,3 %). Asociado al tronco sigmoideo. Tipo IIc: 1 caso (16,7 %). Asociado a arterias sigmoideas accesorias. Patrón III: 3 casos (23 %). Variante clásica. Se definió por la ausencia del tronco común con la arteria cólica izquierda y de la arcada sigmoidea. Tipo IIIa: 2 casos (66,7 %). Un número variable de arterias sigmoideas nacen como ramas colaterales de la arteria mesentérica inferior, sin asociarse al tronco sigmoideo. Tipo IIIb: 1 caso (33,3 %). La arteria cólica izquierda emite como rama colateral la primera arteria sigmoidea y se asocia al tronco sigmoideo. 1. El patrón II es el prevalente en este trabajo (46,2 %). 2. La variante clásica no es la predominante en esta investigación (23 %). 3. La arcada sigmoidea tiene 53,8 % de incidencia.

SUMMARY: The sigmoid arteries are branches of the inferior mesenteric artery and supply the sigmoid colon. They originate from the trunk of the sigmoids. This is the most frequent description according to the consulted authors. The objective is to analyze the variations in the origin and distribution of the sigmoid arteries through dissection. 13 cadaveric preparations formalized at 10 % and instruments were used. The abdominal cavity was dissected to identify the sigmoid arteries. Its bifurcation parallel to the sigmoid colon is evident. It is delimited by palpable repairs. Pattern I: 4 cases (30.8 %). Variant of the sigmoid arcade as a collateral branch of the inferior mesenteric artery. Type Ia: 1 case (25 %). No associations. Type Ib: 1 case (25 %). Associated with the sigmoid trunk. Type Ic: 2 cases (50 %). Associated with accessory sigmoid arteries. Pattern II: 6 cases (46.2 %). Variant of the common trunk between the left colic artery and arteries destined for the sigmoid colon. Type IIa: 3 cases (50 %). No associations. Type IIb: 2 cases (33.3 %). Associated with the sigmoid trunk. Type IIc: 1 case (16.7 %). Associated with accessory sigmoid arteries. Pattern III: 3 cases (23 %). Classic variant. It was defined by the absence of the common trunk with the left colic artery and the sigmoid arcade. Type IIIa: 2 cases (66.7 %). A variable number of sigmoid arteries arise as collateral branches of the inferior mesenteric artery, without being associated with the sigmoid trunk. Type IIIb: 1 case (33.3 %). The left colic artery gives off the first sigmoid artery as a collateral branch and is associated with the sigmoid trunk. 1. Pattern II is the most prevalent in this study (46.2 %). 2. The classic variant is not the predominant one in this research (23 %). 3. The sigmoid arcade has a 53.8 % incidence.

Tromboembolismo de la arteria mesentérica inferior con necrosis del territorio de la arteria rectal superior / Thromboembolism of the inferior mesenteric artery with necrosis of the territory of the superior rectal artery

RESUMEN Fundamento: la elevada mortalidad de la isquemia intestinal obliga a llevar a cabo un esfuerzo de coordinación a todos los niveles al actuar con celeridad. Las isquemias segmentarias son menos comunes y lo son, aún más, las del territorio de la arteria mesentérica inferior. Objetivo: exponer un caso poco frecuente de isquemia de la unión rectosigmoidea, provocado por un embolismo de la arteria mesentérica inferior y subsiguiente necrosis del territorio de la rectal superior. Presentación de caso: paciente femenina 76 años de edad ingresada desde hacía 31 días con diagnóstico de enfermedad cerebrovascular tipo infarto cerebral, que el día que se decide su egreso presenta un cuadro sincopal, presentando luego; dolor, distensión y contractura abdominal en cuadrante inferior izquierdo por lo que es intervenida quirúrgicamente, se encontró una necrosis del recto superior y sigmoides bajo (unión rectosigmoidea). Conclusiones: el embolismo de la arteria mesentérica inferior con necrosis segmentaria es una presentación muy rara de esta afección, en la literatura los casos reportados son escasos, esto se debe a las consideraciones anatómicas de las arterias y venas mesentéricas, cuando ocurre la oclusión de las arteria mesentérica inferior suele ser lenta y progresiva con revascularización o si es de forma abrupta la arteria mesentérica superior suple las necesidades de este territorio mediante la arteria de Drummont, lo cual ocurrió en esta paciente pero no con su arteria terminal (punto crítico de Sudeck) necrosándose el rectosigmoides.

ABSTRACT Background: the high mortality of intestinal ischemia requires an effort of coordination at all levels, requiring prompt action. Segmental ischemias are less common and, more so, those of the territory of the inferior mesenteric artery. Objective: to present a rare case of ischemia of the rectosigmoid junction, caused by an embolism of the inferior mesenteric artery and subsequent necrosis of the upper rectal territory. Case presentation: 76-year-old female patient admitted for 31 days with a diagnosis of cerebral infarction-type cerebrovascular disease, which on the day her discharge is decided presents a syncopal picture, presenting later; pain, abdominal distension and contracture in the lower left quadrant, so she undergoes a surgery finding a necrosis of the upper rectum and low sigmoid (recto-sigmoid union). Conclusions: the embolism of the inferior mesenteric artery with segmental necrosis is a very rare presentation of this affection, in the literature the cases reported are scarce, this is due to the anatomical considerations of the mesenteric arteries and veins, when occlusion of the inferior mesenteric artery occurs is usually slow and progressive with revascularization or if abruptly the superior mesenteric artery supplies the needs of this territory through the Drummont artery, which occurred in this patient but not with her terminal artery (Sudeck's critical point) recto-sigmoid necrosis.

An unusual case of colon vascularization by the inferior mesenteric artery / Um caso incomum de vascularização do cólon pela artéria mesentérica inferior

Abstract In this article we present a rare variant in which the large intestine was vascularized by the inferior mesenteric artery. It was encountered during macro and microscopic dissection of the cadaver of a 63-year-old woman at a university department of human anatomy. In this case, the ascending, transverse, descending, and sigmoid colon and rectum were vascularized by the inferior mesenteric artery, whereas the small intestine, cecum and appendix were supplied by the superior mesenteric artery.

Resumo Neste artigo apresentamos uma variação rara em que o intestino grosso era vascularizado pela artéria mesentérica inferior. A variação foi descoberta durante a dissecção macro e microscópia de um cadáver do sexo feminino, 63 anos de idade, em um departamento universitário de anatomia humana. Neste caso, o cólon ascendente, transverso, descendente e sigmoide e também o reto eram vascularizados pela artéria mesentérica inferior, ao passo que o intestino delgado, ceco e apêndice eram vascularizados pela artéria mesentéria superior.

Estudio anatómico de la arteria mesentérica inferior en el hombre / Anatomic study of the inferior mesenteric artery in man

En el presente trabajo se estudió la morfología de la arteria mesentérica inferior y sus ramas, así como su forma de distribución, grosor y cantidad de divisiones y arcadas en el hombre. Para ello se utilizó una muestra de 15 preparaciones anatómicas, obtenidas por el método de macro y macromicrodisección, se realizaron mediciones de los distintos elementos, y se procesaron luego estos datos estadísticos. El sistema de la arteria mesentérica inferior posee un esquema general que va de formas más simples a más complejas según el nivel de desarrollo. Tiene un vaso visceral impar que termina en el borde mesocólico del intestino grueso mediante vasos rectos. Las ramas terminales y las arcadas simples constituyen los elementos que hacen más complejo el árbol vascular intestinal de los mamíferos, pero que alcanzan su desarrollo más elevado en su representante superior: el hombre. Las ramas secundarias en los sitios de emergencia o dicotomización presentan grosores semejantes, así como los vasos rectos que penetran en la pared intestinal, lo que garantiza de esta forma una irrigación uniforme en el órgano.

In this work, morphology of the inferior mesenteric artery and its branches is studied as well as its distribution form, thickeness, and quantity of divisions and arches in man. For this, a sample of 15 anatomic preparations obtained for the microdisecction method, was used. Messurements of different elements were performed , and afterwards these statistical data were processed. The system of the level of developmen. It has and old visceral vessel which ends in the mesocholic border of the large bowel through direct vessels. Ending branches and simple arches are the elements which make more complex the intestinal vascular tree of mammals, but they reach their highest development in its superior representant:man Secondary branches in the emergency sites or dicotomization present similar thickeness, as well as disect vessels that penetrate into the intestinal wall which guarantees a uniform irrigation to the organ.