Research progress of treatment options on spontaneous isolated superior mesenteric artery dissection based on computed tomography imaging classification / 中华消化外科杂志

Because of the low incidence rate, spontaneous isolated superior mesenteric artery dissection (SISMAD) is once considered as a rare disease. In recent years, with the widespread application of enhanced computed tomography (CT), reports of SISMAD have increased. At present, there is no consensus on the optimal treatment of SISMAD, and there are various imaging classifica-tions based on CT. However, clinical management strategy for SISMAD according to any imaging classification based on CT has not yet been acknowledged. Foreign scholars believe that conservative treatment can improve symptoms in most SISMAD patients, while Chinese scholars prefer endo-vascular intervention. The authors review the research progress of treatment options on SISMAD based on computed tomography imaging classification.

Analysis of influencing factors of therapeutic strategies for spontaneous isolated superior mesenteric artery dissection / 国际外科学杂志

Objective:To investigate the influencing factors and clinical effect analysis of the choice of treatment method for spontaneous isolated superior mesenteric artery dissection (SISMAD).Methods:The clinical data of 35 patients with SISMAD admitted to Beijing Friendship Hospital, Capital Medical University from December 2015 to November 2021 were retrospectively analyzed. They were divided into conservative group ( n=24) and surgical group (endoluminal stent group + open surgery group, n=11). The conservative group was treated with conservative methods, the endoluminal stent group ( n=10) was treated with endoluminal stent placement, and the open surgery group ( n=1) was treated with superior mesenteric artery endarterectomy + angioplasty + ileal resection. The white blood cell (WBC) count on admission, the time of abdominal pain, YOO classification, aorta mesenteric angle(AMA), and the length of hospital stay between the two groups were analyzed. All patients were followed up for more than 24 months, at the end of which the vascular remodeling rate of superior mesenteric artery (SMA) between the two groups was studied. In addition, the primary patency rate and secondary patency rate of intracavitary stents were analyzed. Measurement data that conform to normal distribution were expressed as mean ± standard deviation ( ± s), and independent samples t-test was used for comparison between groups; measurement data that do not conform to normal distribution were expressed as median (interquartile range) [ M( Q1,Q3)], the nonparametric test was used for comparison between groups. Enumeration data were compared between groups using the Chi-square test. Results:Univariate analysis showed that compared with the conservative group, the IVS type in YOO classificationin of surgical group was significantly more than the conservative group. There was no significant difference in WBC, duration of abdominal pain, or AMA at admission ( P>0.05). In addition, the length of hospital stay in the conservative group was significantly shorter than that in the surgical group. No intestinal necrosis occurred in endoluminal stent group. After 24 months of follow-up, the remodeling rate of SMA in the surgical group was higher than that in the conservative group; the primary patency rate of the endoluminal stent group was 87.5%, and the secondary patency rate was 100%. One patient in the conservative group developed SMA dissection aneurysm during 12 months of follow-up and received endovascular treatment. Conclusions:For the treatment of SISMAD, most patients can be cured by conservative treatment. However, for patients with consistent abdominal pain and IVS type in YOO classification, if there is no severe manifestation of peritonitis, it is recommended to perform endovascular stent placement as soon as possible to open the blood supply. Meanwhile, the SMA stenting has an ideal long-term patency rate and vascular remodeling rate.

The ratio of superior mesenteric artery diameter to superior mesenteric vein diameter based on non-enhanced computed tomography in the early diagnosis of spontaneous isolated superior mesenteric artery dissection / 世界急诊医学杂志（英文）

@#BACKGROUND: Spontaneous isolated superior mesenteric artery (SMA) dissection (SISMAD) is a rare cause of abdominal pain. The aim of the study is to investigate the role of a new parameter, the ratio of the SMA diameter to the superior mesenteric vein (SMV) diameter (SMA/SMV) based on non-enhanced computed tomography (CT), in the early diagnosis of SISMAD. METHODS: In a registry study from December 2013 to June 2021, 97 abdominal pain SISMAD patients (SISMAD group) admitted to our hospital were enrolled. Meanwhile, the matched sex and age abdominal pain non-SISMAD patients at 1:2 were collected in reverse chronological order as the control group. Student's t-test, Wilcoxon rank-sum test, and Chi-square test were used to compare differences between the SISMAD and control groups. MedCalc was used to generate receiver operating characteristic (ROC) curve. RESULTS: A total of 291 abdominal pain patients, including 97 SISMAD patients and 194 non-SISMAD patients, were included in the current study. The maximum SMA diameter, perivascular exudation, and SMA/SMV based on non-enhanced CT were significant between the two groups (all P<0.05). ROC curves showed that for the maximum SMA diameter, the area under the curve (AUC), cut-off, sensitivity, and specificity were 0.926, 9.80, 93.8%, and 79.4%, respectively. For SMA/SMV, its AUC, cut-off, sensitivity, and specificity were 0.956, 0.83, 88.7%, and 92.3%, respectively. The diagnostic efficiency of SMA/SMV was better than that of the maximum SMA diameter (P<0.05). The combined parameters of SMA/SMV and maximum SMA diameter had the best diagnostic efficiency (AUC=0.970). CONCLUSION: SMA/SMV may be a potential marker for SISMAD.

Clinical characteristics and treatment of spontaneous isolated superior mesenteric artery dissection / 中华消化外科杂志

Objective To investigate the clinical characteristics and treatment of spontaneous isolated superior mesenteric artery dissection (SISMAD).Methods The retrospective cross-sectional study was conducted.The clinical data of 80 patients with SISMAD who were admitted to the Wuhan Union Hospital Affiliated to Huazhong University of Science and Technology from February 2002 to March 2017 were collected.All the patients underwent computed tomographic angiography (CTA) and digital subtraction angiography (DSA) examinations,and then received conservative medical treatment,endovascular interventional treatment or exploratory laparotomy and revascularization.Observation indicators:(1) clinical features;(2) treatment;(3) follow-up.Follow-up using outpatient examination and telephone interview was performed once at 1,6 and 12 months after discharge and once every year after 1 year up to March 2017.Follow-up included recurrence of abdominal pain,changes of superior mesenteric artery (SMA) dissection or changes of SMA and remodeling of dissection after stent implantation.Measurement data were represented as average (range).Results (1) Clinical features:①) Clinical manifestation:75 of 80 patients had symptoms,and 5 without symptoms were diagnosed during health examination.Of 75 patients with symptoms,abdominal pain was the first symptom,with the main of the peri-umbilicus and epigastric pains,without peritoneal irritation sign,including 14 with nausea and vomiting and 4 with bloody stool.②) Results of imaging examination:80 patients were confirmed by CTA examination.CTA showed that there was local thickening of SMA,true and false double-lumen formation,thinner true arterial lumen with visible intimal flap shadow and thrombosis in the false lumen.Results of CTA showed that the first break was located within 1-6 cm from opening of SMA in 77 patients and in the middle and distal segment of SMA in 3 patients,without aortic dissection (AD).(2) Treatment:of 75 patients with symptoms,53 received conservative medical treatment with an effective rate of 70.7％ (53/75),average time of symptomatic remission was 5 days (range,1-12 days);22 received stent imnplantation via right femoral artery approach using self-expanding bare stent or covered stent,with a success rate of implantation of 95.5％ (21/22),including 21 with successful implantations and 1 with false implantation.One patient with false implantation had symptomatic remission after 1-week conservative medical treatment,and there was no exploratory laparotomy and revascularization.Five patients without symptom were required to control blood pressure and get regular follow-up,without other intervention.(3) Follow-up:75 patients with symptoms were followed up for 36 month (range,1-60 months).During follow-up,of 53 patients with conservative medical treatment,2 patients had significant progressions of SMA dissection by CTA examination,1 had recurrence and exacerbation of abdominal pain accompanied with bloody stool at 2-month follow-up,showing an aneurism of SMA dissection by DSA examination,and 1 had recurrence of abdominal pain at 1-year follow-up,both patients were improved after stent implantation;other 51 had no recurrence.Of 22 patients with stent implantation,1 had repeated abdominal pain during follow-up and the symptom became aggravated at 1-year follow-up,showing a thrombosis fonnation and proximal stenosis by CTA examination,and then underwent stent implantation in the proximal stenosis after anticoagulant therapy;SMA dissection of 1 patient completely healed at 2-year follow-up by CTA examination;other 20 patients had stent patency.Five patients without symptom had regular follow-up,showing no disease progression.Conclusions The symptoms of SISMAD are different,and abdominal pain is the one of main symptoms.At present,treatment regimens include conservative medical treatment,endovascular interventional treatment and surgery,and individualized treatment is decided according to clinical symptoms and physical signs of patients and imaging examinations.

Diagnosis and treatment of spontaneous isolated superior mesenteric artery dissection / 中华消化外科杂志

With the development of imaging technology,the reports of spontaneous isolated superior mesenteric artery dissection become more frequently,but there is no consensus on the therapeutic plans which consist of conservative therapy,endovascular treatment and surgical treatment.Therefore,the related questions of the spontaneous isolated superior mesenteric artery dissection will be discussed in order to improve the diagnosis and treatment of vascular diseases of digestive tract with a review of literatures.

Disección espontánea de arteria mesentérica superior / Spontaneous dissection of superior mesenteric artery

Introduction: Spontaneous dissection of the superior mesenteric artery (AMS) is a infrecuent pathology, representing the main frequency of isolated peripheral artery dissection, it is more common in males and occurs in the fifth decade of life. Materials and Methods: Retrospective cases analysis of patients with spontaneous dissection of AMS that were handled in our hospital, in last two years. Results: Two patients were diagnosed in this period, both active smoking and hypertensive pathology, appearing with severe abdominal and back pain. The diagnosis was made by CT angiogram of the abdomen and pelvis; establishing medical management of hypertension and standard heparin anticoagulation. Both patients had dissections at new imaging controls and one patient required exploratory laparotomy with bowel resection and intestinal anastomosis. Patients recovered satisfactorily and are in control. Conclusions: Spontaneous dissection of the SMA is a rare disease with uncertain evolution, it may occur in middle age of life, associated with smoking and hypertension. The suspected diagnosis is clinical and can be confirmed by CT angiography. Initial management remains conservative and occasionally is surgical.

Introducción: La Disección espontánea de la arteria mesentérica superior (AMS) es una patología infrecuente, representando la primera frecuencia de disección de arteria periférica aislada, ocurre más en varones en la quinta década de la vida. Material y Método: Casos en los últimos 2 años revisados en forma retrospectiva. Resultados: Dos pacientes fueron diagnosticados en este período, presentándose ambos por dolor abdominal y lumbar de gran intensidad al Servicio de Urgencia del hospital; ambos tabáquicos activos y con hipertensión arterial (HTA). El diagnóstico fue realizado por angioTC de abdomen y pelvis, instaurándose manejo médico de HTA y anticoagulación con heparina estándar. Los 2 pacientes presentaron nuevas disecciones en los controles imagenológicos y un paciente requirió laparotomía exploradora con resección intestinal y anastomosis por isquemia intestinal. Los pacientes evolucionaron satisfactoriamente y se encuentran en control. Conclusiones: La disección espontánea de la AMS es una enfermedad poco frecuente de evolución incierta, que ocurre en la edad media de la vida, asociada a tabaquismo e HTA, la sospecha es clínica y el diagnóstico por imágenes. El manejo inicial sigue siendo médico y ocasionalmente es quirúrgico.

Rapidly Aggravated Dissecting Flap by Angiography during Percutaneous Stent Placement for Acute Isolated Superior Mesenteric Artery Dissection

Acutely aggravated dissecting flap and consequent occlusion of the superior mesenteric artery (SMA) by simple contrast passage during initial angiography for percutaneous stent placement is a uncommon event, which usually is not reported. After analysis of many factors that underlie development of such complications, we present herein one case of successful treatment of isolated SMA dissection and its complications with favorable outcomes during 25 months follow-up after percutaneous stent placement.

Isolated Dissection of Superior Mesenteric Artery: Study on the Treatment Guidelines

PURPOSE: Isolated superior mesenteric artery (SMA) dissection is a rare, but increasing vascular disorder. However, optimal treatment guidelines are not well established. The purpose of this study is to review a single institutional experience in the management of isolated SMA dissections and establish optimal treatment guidelines. METHODS: Between November 2004 and August 2009, 26 patients were diagnosed with isolated SMA dissection at Eulji University Hospital. Diagnosis was confirmed with CT scans in all patients. We retrospectively reviewed the medical records, imaging studies, and the early outcomes of the patients. RESULTS: There were 22 (84.5%) men and 4 women. The mean age was 55.4 (39~74) years. The mean follow-up was 39.1 (4.1~53.3) months. In 15 patients, CT scans were performed for abdominal pain, and in the other 11 patients, the isolated SMA dissections were detected incidentally during workup for other causes. The radiographic findings included an intimal flap with a patent false lumen in 16 and intramural hematoma in 10. The dissection started at a mean of 22.3 (5~46) mm from the origin of the SMA with a mean length was 47.7 (10~150) mm. Treatments included expectant management in 13, anticoagulation in 6, stenting in 6 patients, and surgery in one case of bowel infarction. None required additional intervention. All patients remained asymptomatic during follow-up. CONCLUSION: Most patients with isolated SMA dissection were successfully managed medically. Surgical or percutaneous intervention should be reserved for those with evidence of bowel necrosis or mesenteric ischemia and failed cases to initial medical treatment.

A Stent Graft Placement in a Focally Progressed Dissection in the Superior Mesenteric Artery

Focal aneurysmal change after spontaneous superior mesenteric artery (SMA) dissection has been reported rarely. A stent graft implantation can exclude false lumen and possibly make major abdominal operation avoidable. A 52-year-old male patient was admitted due to abdominal pain for 10 days. A CT scan showed severe narrowing of the true lumen of SMA, approximately a 7 cm segment from the origin, due to compression by the thrombosed false lumen. Five days after admission, abdominal pain aggravated progressively. The follow-up CT revealed focal aneurysmal dilatation of the dissected SMA segment. I report here an endovascular treatment with stent graft implantation for a focal aneurysmal change after SMA dissection.

Isolated Spontaneous Dissection of Superior Mesenteric Artery: Treated by Percutaneous Endovascular Stent Placement / 대한소화기학회지

Isolated spontaneous dissection of the superior mesenteric artery (SMA) without aortic dissection is a rare cause of acute mesenteric ischemia. A sudden decrease of intestinal blood flow can lead to fatal complications such as ischemic necrosis, shock, and death. Therefore, early diagnosis and therapeutic approach before the occurrence of intestinal infarction are the most important factor to determine the patient's prognosis. A 52-year-old male presented with postprandial periumbilical pain, and isolated spontaneous dissection of the superior mesenteric artery with mural thrombus was detected by abdominal computed tomography with contrast enhancement. By the percutaneous implantation of vascular metallic stent via femoral artery, he was treated successfully. We report a case of isolated spontaneous dissection of the SMA treated by a percutaneous endovascular stent replacement with a review of literature.

Isolated Spontaneous Dissection of Superior Mesenteric Artery: Treated by Percutaneous Endovascular Stent Placement / 대한소화기학회지

Isolated spontaneous dissection of the superior mesenteric artery (SMA) without aortic dissection is a rare cause of acute mesenteric ischemia. A sudden decrease of intestinal blood flow can lead to fatal complications such as ischemic necrosis, shock, and death. Therefore, early diagnosis and therapeutic approach before the occurrence of intestinal infarction are the most important factor to determine the patient's prognosis. A 52-year-old male presented with postprandial periumbilical pain, and isolated spontaneous dissection of the superior mesenteric artery with mural thrombus was detected by abdominal computed tomography with contrast enhancement. By the percutaneous implantation of vascular metallic stent via femoral artery, he was treated successfully. We report a case of isolated spontaneous dissection of the SMA treated by a percutaneous endovascular stent replacement with a review of literature.