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J Cardiovasc Surg (Torino). 2017 May 26. doi: 10.23736/S0021-9509.17.09899-8. [Epub ahead of print]

Aortic aneurysm endovascular treatment with the parallel graft technique from the aortic arch to the iliac axis.

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Vascular and Endovascular Surgery Unit, Department of Surgery, San Francesco Hospital, Nuoro, Italy.
Vascular and Endovascular Surgery Unit, Department of Surgery, San Francesco Hospital, Nuoro, Italy -
Vascular Surgery Unit, Department of Surgery, Cardinal Panico Hospital, Tricase, Lecce, Italy.
Cardiology Unit, Department of Cardiovascular Disease, Tor Vergata University of Rome, Rome, Italy.
Vascular and Endovascular Surgery Unit, Department of Medicine, Surgery and Neurological Sciences, University of Siena, Siena, Italy.



The chimney technique has been developed for the treatment of complex aortic aneurysms. We analyzed the midterm to long-term outcomes of this approach from a single- centre experience.


From October 2008 to July 2016, 58 patients underwent endovascular aortic aneurysm repair using the chimney technique. Indications for treatment were thoracic aortic aneurysm (TAA) (n = 11), thoracoabdominal aortic aneurysm (TAAA) (n = 2), pararenal aortic aneurysm (PAAA) (n= 15), aortoiliac/isolated hypogastric artery aneurysm (n = 25), type I endoleak after previous TEVAR/EVAR (n=4), proximal pseudoaneurysm after AAA open repair (n = 1). Elective (82.8%) and emergent (17.2%) procedures were included.


The immediate technical success was 100%. Single, double and triple chimneys were performed in 46, 10 and 2 patients, respectively. Overall, 61 target vessels (3 left common carotid arteries, 8 left subclavian arteries, 3 celiac trunks, 3 superior mesenteric arteries, 19 renal arteries and 25 hypogastric arteries) were involved. Post-operative mortality was 0. No neurologic complications were registered. Primary patency rate of the chimney stent/stent graft was 98.3%. Low flow type I endoleak was observed in 4 patients (6.9%). Post-operative chimney graft re-intervention rate was 1.7%. The median follow up was 32±20 months (range 3- 96 months). Overall estimated survival at 12, 50 and 80 months was 100%, 89% and 44%, respectively. Estimated freedom from endoleak at 1, 12, 24 and 36 months was 96.5%, 95%, 95% and 93%, respectively. One HA stent graft occluded at the 3rd month of follow up. No reintervention was performed.


Our experience with the chimney technique for aortic aneurysms from the aortic arch to the iliac axis shows promising and durable mid- and long term results. Endograft oversizing, associated with the chimney graft diameter and length choice remain fundamental to reduce the risk of the most frequent procedure complications: type I endoleak and CG occlusion.The wider use of this technique should be justified in patients considered at high risk for open repair and/or not suitable for the custom-made branched/fenestrated endografts.

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