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Long-term result of hybrid procedure for an extensive thoracic aortic aneurysm in Takayasu arteritis: a case report
© Obitsu et al; licensee BioMed Central Ltd. 2010
Received: 21 March 2010
Accepted: 20 April 2010
Published: 20 April 2010
We herein present a 60 years old woman with Takayasu arteritis and an extensive thoracic aortic aneurysm who initially underwent a total aortic arch replacement. Then, in the second stage, thoracic endovascular aortic repair was performed using the elephant trunk graft as the proximal landing zone at four weeks after aortic arch repair. The postoperative course was relatively uncomplicated, but a type II endoleak was noted. Currently, about 5 years postoperatively, the slight type II endoleak from intercostal artery persists, but aneurism dilatation has not been noted, so the patient is being followed up.
Single-stage surgery is preferable for extensive thoracic aortic aneurysms, but because of the excessive invasiveness of this approach, staged surgery must sometimes be performed. When staged surgery is selected, rupture of the residual lesion during the interval period is always a concern, so the second stage of surgery must be scheduled as soon as possible after the first. We herein present a patient with Takayasu arteritis and an extensive thoracic aortic aneurysm who initially underwent a total aortic arch replacement. Then, in the second stage, thoracic endovascular aortic repair (T EVAR) was performed using the elephant trunk graft as the proximal landing zone. Long-term results have been satisfactory.
Extensive thoracic aortic aneurysms are not uncommon in clinical practice, and the surgeon must decide whether to perform single-stage or multistage surgery. In cases with multiple adjacent aneurysms, a single-step procedure is theoretically possible, but because of excessive invasiveness, surgical outcomes may be poor [2, 3]. According to a report by the Japanese Association for Thoracic Surgery, the hospital mortality rate after arch-descending aortic replacement is significantly worse than after TAR (14.3% vs. 6.5%, p < 0.001). Kouchoukos et al  performed single-stage repair using a clamshell incision in 46 patients and reported hospital death in only 3 patients (6.5%). However, 17% required a rethoracotomy for hemostasis, and other complications in survivors were reported, including mechanical ventilation for 72 hours or more in 42% (tracheotomy in 13%), and transient cerebral ischemia in 13%. On the other hand, when multistage surgery is selected to reduce surgical invasiveness, the surgical priority of multiple aneurysms must be decided based on diameter, morphology, and propensity for dilatation; and because of the risk of rupture during the interval between the two stages, the second stage of surgery must be scheduled as soon as possible after the first. Safi et al.  reported a mortality rate of 5.1% for the first stage and 6.2% for the second stage. The mortality rate during the interval between operations was 3.6%, of which 75% were the result of aneurysm rupture.
For a second-stage TEVAR after arch repair, a left thoracotomy is not necessary, so early second-stage surgery can be performed; however, there are few case reports, so long-term results are unknown. In 22 patients who underwent arch repair, Greenberg et al.  performed TEVAR using the elephant trunk as the proximal landing zone. They reported good mid-term results after a mean follow-up period of 17.8 months, with aneurysm-related mortality of 4.5% at 1 month, 11.3% at 1 year, and 11.3% at 2 years.
The present patient still has a type II endoleak, but aneurysm dilatation has not been noted, with good long-term results. Early second-stage surgery was possible only 4 weeks after initial surgery. However, TEVAR for aortic aneurysms in Takayasu arteritis has rarely been reported [6, 7], so long-term outcomes are unknown. Further careful clinical observation is therefore necessary.
Written informed consent was obtained from the patient for publication of this case report and accompanying images. A copy of the written consent is available for review by the Editor-in-Chief of this journal.
The authors are indebted to prof. J. Patrick Barron of the Department International Medical Communications of Tokyo Medical University for his review of this manuscript.
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