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True Lumen Stabilization to Overcome Malperfusion in Acute Type I Aortic Dissection.
Seminars in Thoracic and Cardiovascular Surgery 2018 December 9
Acute type I aortic dissection (AD) complicated by true lumen (TL) collapse and malperfusion downstream is associated with devastating prognosis. The study reports an institutional mid-term experience with TL stabilization by uncovered stents to restore perfusion as a supplement to proximal thoracic aortic surgery. Between January 2007 and May 2017, 181 out of 270 acute type A AD patients were operated on type I AD. Eighteen uncovered stents (10%) were used to expand the aortic TL in presence of visceral and/or peripheral malperfusion. The procedures took place in a hybrid operating room and were combined with proximal aortic surgery. During follow-up (mean ± standard deviation 3.44 ± 2.1 years), the fate of AD was evaluated by computed tomography. Indication for TL stenting included visceral (44%) or peripheral malperfusion (11%) or both (45%). Stenting of aortic branches followed in 33%. All patients underwent proximal repair and were combined with frozen elephant trunk (67%) or retrograde descending aorta stent grafting (11%). Thirty-day mortality was 16.7%. Two-year survival was 71.8%. The false lumen around the uncovered stents remained patent in 89% and the aortic diameter increased 0.1 cm/y. No intimal rupture or occlusion of arteries occurred. In 1 patient, the stented aortic lumen was visualized after 6.3 years and neointima ingrowth covering the nitinol frame was found. In acute type I AD, combined endovascular-surgical procedures in a hybrid operation room setting can be used safely to resolve distal malperfusion. Encapsulation of uncovered stents within the intimal wall provides a stable fundament for endovascular techniques to close entry tears and false lumen.
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