Alterations of blood flow pattern after triple stent endovascular treatment of saccular abdominal aortic aneurysm: a porcine model.

Oliveira, J.; Aquino, Maurício de Amorim; Barros, Svetlana Maria Wanderley de; Pitta, Guilherme Benjamin Brandão; Pereira, Adamastor Humberto

doi:10.1590/0100-69912016003004

Cited by 4 publications

(4 citation statements)

References 20 publications

(14 reference statements)

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“…Although blood flow retention after stenting was slightly higher with helical stents than with straight stents, the difference between straight and helical stents was not significant with respect to the SD value. The possibility of velocity reduction after stenting was also reported by Oliveira et al in a pig aorta (26). Conversely, de Borst et al performed stenting and velocimetry, but their results showed a reduction in diameter, resulting in a faster velocity than that before stenting (27).…”

Section: Discussionmentioning

confidence: 71%

Effects of helical centerline stent vs. straight stent placement on blood flow velocity

Kohata

Ohta

Jin

et al. 2023

Front. Med. Technol.

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As an approach to maintain patency in femoropopliteal stenting, a helical stent configuration was proposed, which showed improved patency in clinical trials. However, the effects of helical stent placement on the flow have not been quantitatively analyzed. The purpose of this study was to estimate flow velocities to quantify the influence of helical stent placement. Helical and straight stents were implanted in three healthy pigs, and the flow velocities were estimated using the time-intensity curve (TIC) in the angiography images. The angiographic images indicated thinning of the leading edge of the contrast medium through the helically deformed artery, which was not observed in the straight stent. The slower rise of the TIC peak in the helical stent indicated faster travel of this thinner edge. Arterial expansion due to stenting was observed in all cases, and the expansion rate varied according to location. All cases of helical stent implantation showed that velocity was maintained (55.0%–71.3% velocity retention), unlike for straight stent implantation (43.0%–68.0% velocity retention); however, no significant difference was observed.

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Section: Discussionmentioning

confidence: 71%

Effects of helical centerline stent vs. straight stent placement on blood flow velocity

Kohata

Ohta

Jin

et al. 2023

Front. Med. Technol.

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“…In all cases, both helical and straight stenting resulted in velocity reductions. Oliveira et al measured average blood flow velocity in the aorta of pigs and found a reduction in velocity after stent placement (10). This velocity reduction may be related to artery expansion by stent placement (11).…”

Section: Discussionmentioning

confidence: 99%

Comparing the Effect of Helical-centerline Stent Placement on Blood Flow Velocity with a Straight Stent

Kohata

Anzai

Ohta

2022

Preprint

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Stent treatment can be used to treat blood vessel stenosis in a less invasive manner, but re-stenosis is a concern. Because a helical-stent configuration has been thought to reduce the amount of intimal hyperplasia, the helical stent is considered clinically effective. The effects of the helical stent on blood flow velocity, however, have not been studied. In this study, we estimated flow velocities before and after helical stenting using time-intensity-curve (TIC) from angiography images and compared them with straight stenting velocities. As a result, in all cases (N = 3), the velocity reduction was less with helical stenting than with straight stenting. Based on angiography images, this flow estimation method can estimate patient-specific blood flow velocity in situ even in a presence of a stent.

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“…In a study by Oliveira et al (6), manually manufactured multilayer stents composed of three metallic mesh stents joined together were implanted into swine models with aortic saccular aneurysms of bovine pericardium, in a similar fashion to our methodology, though not employing the Cardiatis MFMS. Although the authors did not evaluate aneurysmal sac thrombosis after aortic explants, a duplex scan was conducted on all subjects, and changes were noted in flow direction, from a whirlwind pattern in the aneurysmal sac to a laminar intra-stent flow, with remarkable differences in peak systolic speed (6).…”

Section: ' Discussionmentioning

confidence: 99%

Multilayer stents affect the final diameter of aortic aneurysms and maintain renal artery patency for a short time in a swine experimental model

Strazzi

Aun

Sincos

et al. 2021

Clinics

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We sought to analyze the hemodynamic effects of the multilayer flow-modulated stent (MFMS) in Thoracoabdominal aortic aneurysms (TAAAs). METHODS: The hemodynamic effects of MFMS were analyzed in aortic thoracoabdominal aneurysms in experimental swine models. We randomly assigned 18 pigs to the stent or control groups and underwent the creation of an artificial bovine pericardium transrenal aneurysm. In the stent group, an MFMS (Cardiatis, Isnes, Belgium) was immediately implanted. After 4 weeks, we evaluated aneurysm sac thrombosis and renal branch patency by angiography, duplex scan, and morphological analysis. RESULTS: All the renal arteries remained patent after re-evaluation in both groups. Aneurysmal sac thrombosis was absent in the control group, whereas in the stent group it was present in 66.7% of aneurysmal sacs (p=0.061). The mean final aneurysm sac diameter was significantly lower in the stent group (mean estimated reduction, 6.90 mm; p=0.021). The proximal neck diameter decreased significantly in the stent group (mean difference, 2.51 mm; p=0.022) and grew significantly in the control group (mean difference, 3.02 mm; p=0.007). The distal neck diameter increased significantly in the control group (mean difference, 3.24 mm; p=0.017). There were no significant findings regarding distal neck measurements in the stent group. CONCLUSION: The MFMSs remained patent and did not obstruct the renal arteries within 4 weeks. In the stent group, the device was also associated with a significant decrease in aneurysmal sac diameter and a large proportion (albeit non-significant) of aneurysmal sac thrombosis.

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Alterations of blood flow pattern after triple stent endovascular treatment of saccular abdominal aortic aneurysm: a porcine model.

Cited by 4 publications

References 20 publications

Effects of helical centerline stent vs. straight stent placement on blood flow velocity

Effects of helical centerline stent vs. straight stent placement on blood flow velocity

Comparing the Effect of Helical-centerline Stent Placement on Blood Flow Velocity with a Straight Stent

Multilayer stents affect the final diameter of aortic aneurysms and maintain renal artery patency for a short time in a swine experimental model

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