Open vs. endovascular for chronic mesenteric ischemia
References
1. Ann Vasc Surg. 1991;5:403-6
2. J Vasc Surg. 2013;58:1316-23
5. J Vasc Surg. 2007;45:1162-71
6. J Vasc Surg. 2015;62:767-72
Eric Endean, MD, is the director of the aortic center, Gordon L. Hyde Endowed Professor and Chair, and vascular surgery section head, vascular and endovascular surgery at UK HealthCare, University of Kentucky, Lexington. He had no relevant disclosures.
Presenting the case for endovascular intervention
Chronic mesenteric ischemia (CMI) is an uncommon, but lethal, problem when left untreated. Before the endovascular era, the only option was open revascularization, which is challenging in this chronically ill, malnourished population with diffuse, systemic, atherosclerotic disease. Morbidity and mortality was relatively high because of the comorbid conditions and chronically ill status of the patients. The first mesenteric bypass was performed in 1958 by Maynard and Shaw.1
Options for open repair include transaortic endarterectomy, antegrade bypass from the supraceliac aorta or distal thoracic aorta, or retrograde bypass from the iliac artery, all of which are major abdominal procedures. Endovascular interventions are now the most commonly performed procedures for CMI in the United States based on national studies.2
Technical success with endovascular interventions can be achieved in well over 90% of patients, and multiple vessels can be treated simultaneously from either a femoral or brachial approach. The primary concern with endovascular interventions has been long-term patency, with restenosis from intimal hyperplasia or thrombosis causing recurrent symptoms in up to 30%-50% at 3-5 years.5-7 However, these rates are based on use of bare metal stents, rather than covered stents. Recent studies8 suggest that stent grafts have markedly improved outcomes over bare metal stents for ostial lesions, decreasing recurrence. Oderich found that freedom from recurrence was 92% with stent grafts as compared with 53% for bare metal stents, with primary patency rates of 92%, at 3 years8, comparable to even the best open bypass results. Schoch first reported the use of covered stents in the mesenteric circulation, and found that no patients developed recurrent stenosis at 2 years.9 Other concerns with endovascular intervention include embolization and dissection, which have not been frequently reported.
Mortality from open surgery ranges from 5% to 15%, with morbidity of 30%-40%.4 Mortality from endovascular intervention is markedly lower, in the range of 3.56% vs. 7.23%.5 Long-term survival is not different between endovascular vs. open repair (69% vs. 65%),4 with the majority of deaths related to cardiac, pulmonary, or malignancy issues. Moghadamyeghaneh, in a review of the Nationwide Inpatient Sample database, found that open surgery was one of the major predictors for higher morbidity (odds ratio, 5.07) and mortality (OR, 5.13), despite the fact that endovascular patients were older (another risk factor for adverse outcomes) and had more comorbidities in this nonrandomized, real-world study.2
Further, if one considers cost as a metric for decision making, a Markov clinical decision model by Hogendoorn et al suggests an endovascular first approach is preferred, despite the presumed higher rate of recurrence expected with use of bare metal stents, rather than covered stents, utilized for this analysis.10 Clearly, the financial advantage would be even greater for endovascular with the lower rates of recurrence with covered stents more recently reported.
If a patient develops recurrent stenosis after endovascular intervention, open bypass may be considered as an alternate to repeat endovascular intervention, dependent on the nutritional status, life expectancy, and initial intervention undertaken. Alternately, patients who undergo open repair are not immune to restenosis, with a recurrence rate of 10%-20%.11,12 Oderich found that there was a 22% mortality in those treated with repeat open interventions, with a 47% complication rate. Endovascular interventions, however, had a significantly lower rate of complications, 16%, and mortality. For patients with recurrent disease after open revascularization for CMI, the endovascular approach should also be the preferred approach.
Any lesion which is anatomically suitable for endovascular repair should first have an attempt made via this approach, utilizing covered stents. While there is a role for open revascularization, endovascular interventions can be safely performed, with minimal morbidity and mortality, and good long-term patency, even in the sickest patients. Endovascular intervention should be the procedure of choice for chronic mesenteric ischemia and recurrent chronic mesenteric ischemia.
