Effects of stent-graft geometry and blood hematocrit on hemodynamic in Abdominal Aortic Aneurysm

Polańczyk, Andrzej; Podyma, Marek; Stefańczyk, Ludomir; Zbiciński, Ireneusz

doi:10.2478/v10176-012-0005-2

Cited by 26 publications

(11 citation statements)

References 13 publications

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“…A CFD was utilized to simulate blood flow and WSS for one cardiac cycle as previously described [24]. The vessel wall area was treated as a rigid surface.…”

Section: Computational Fluid Dynamics Analysismentioning

confidence: 99%

Computational Fluid Dynamic Accuracy in Mimicking Changes in Blood Hemodynamics in Patients with Acute Type IIIb Aortic Dissection Treated with TEVAR

et al. 2018

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Background: We aimed to verify the accuracy of the Computational Fluid Dynamics (CFD) algorithm for blood flow reconstruction for type IIIb aortic dissection (TBAD) before and after thoracic endovascular aortic repair (TEVAR). Methods: We made 3D models of the aorta and its branches using pre- and post-operative CT data from five patients treated for TBAD. The CFD technique was used to quantify the displacement forces acting on the aortic wall in the areas of endograft, mass flow rate/velocity and wall shear stress (WSS). Calculated results were verified with ultrasonography (USG-Doppler) data. Results: CFD results indicated that the TEVAR procedure caused a 7-fold improvement in overall blood flow through the aorta (p = 0.0001), which is in line with USG-Doppler data. A comparison of CFD results and USG-Doppler data indicated no significant change in blood flow through the analysed arteries. CFD also showed a significant increase in flow rate for thoracic trunk and renal arteries, which was in accordance with USG-Doppler data (accuracy 90% and 99.9%). Moreover, we observed a significant decrease in WSS values within the whole aorta after TEVAR compared to pre-TEVAR (1.34 ± 0.20 Pa vs. 3.80 ± 0.59 Pa, respectively, p = 0.0001). This decrease was shown by a significant reduction in WSS and WSS contours in the thoracic aorta (from 3.10 ± 0.27 Pa to 1.34 ± 0.11Pa, p = 0.043) and renal arteries (from 4.40 ± 0.25 Pa to 1.50 ± 0.22 Pa p = 0.043). Conclusions: Post-operative remodelling of the aorta after TEVAR for TBAD improved hemodynamic patterns reflected by flow, velocity and WSS with an accuracy of 99%.

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“…A CFD was utilized to simulate blood flow and WSS for one cardiac cycle as previously described [24]. The vessel wall area was treated as a rigid surface.…”

Section: Computational Fluid Dynamics Analysismentioning

confidence: 99%

Computational Fluid Dynamic Accuracy in Mimicking Changes in Blood Hemodynamics in Patients with Acute Type IIIb Aortic Dissection Treated with TEVAR

et al. 2018

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“…They are used by emergency services for qualitative and quantitative analysis during events involving hazardous substances [12]. Due to the frequent inability to use instrumental methods to identify substances, the results obtained by electrochemical sensors form the basis of tactics of rescue operations [13][14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Effects of interfering gases in electrochemical sensors NH₃ and NO₂

Majder–Łopatka

2018

MATEC Web Conf.

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Electrochemical sensors used for toxic gas measurement. In this paper construction EC sensor and principle of operation has been described. The results of research on the influence of interfering gases on the readings of detectors containing ammonia and nitric oxide (IV) electrochemical sensors are presented. Span gases were used in the tests: 100 ppm CO, 25 ppm H2S, 25 ppm NH3, 10 ppm NO, 25 ppm NO2, 10 ppm Cl2, 10 ppm HCN, 10 ppm HCl, 2% vol. H2, 2.5% by volume CH4, 0.35% by volume of C5H12. The conducted research indicates that the presence of chlorine, hydrogen chloride, hydrogen cyanide, carbon monoxide and saturated hydrocarbons in the atmosphere does not affect the work of the ammonia electrochemical sensor. In the case of this sensor, there was a significant cross effect in relation to hydrogen sulphide and hydrogen. The administration of these substances indicated the presence of ammonia outside the measuring range (200 ppm). In the measurements using the NO2 sensor, in most cases negative interference was found. The test results indicate that the measurements made with electrochemical sensors may be subject to error in the presence of interfering gases. The results obtained may be both understated and overstated.

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“…The main purpose in planning, selecting a location and arranging a storage site is to implement such safeguards to limit the potential negative environmental effects of its impact on the environment [1][2][3][4]. Unfortunately, for economic reasons, investors minimize related expenses [5][6][7][8][9]. They concern related works with the acquisition of suitable soils with a certain permeability, constituting a natural barrier to pollution, research on the level and directions of water migration, changes in aquifers, the possibility of technical improvement of soil insulation properties [10][11][12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Hazards associated with municipal waste storage. Vol. I

Dmochowska

2018

MATEC Web Conf.

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Depositing municipal waste in a responsible and controlled manner in landfills allows their decomposition to stabilized material. However, there are many environmental risks during operation and stabilization after landfill closure. These include: dusts, odors, potential fires associated with the presence of landfill gas and it is microbiological hazards and leachates. The latter are also generated many years after closure and reclamation of the landfill. In the event of a leak trough the anti-filtration shutter, toxic compounds found in the leachates can migrate and contaminate to groundwater. The article presents the quantitative and qualitative analysis of leachates in the final operational period of the landfill and after its closure. In both cases, the chromatographic analysis was carried out using the same conditions, i.e. solvent, extraction time, chromatograph and conditions for chromatographic analysis of samples. Physical and chemical leachate examinations were performed on the basis of valid standards. Their results show that the waste deposit is subject to increasingly advanced biodegradation processes of organic compounds. The values of such indicators as COD and BZT5 are decreasing. However, they remain quite significant, which indicates the presence of hard-to decompose and newly compounds in the leachates.

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Effects of stent-graft geometry and blood hematocrit on hemodynamic in Abdominal Aortic Aneurysm

Cited by 26 publications

References 13 publications

Computational Fluid Dynamic Accuracy in Mimicking Changes in Blood Hemodynamics in Patients with Acute Type IIIb Aortic Dissection Treated with TEVAR

Computational Fluid Dynamic Accuracy in Mimicking Changes in Blood Hemodynamics in Patients with Acute Type IIIb Aortic Dissection Treated with TEVAR

Effects of interfering gases in electrochemical sensors NH₃ and NO₂

Hazards associated with municipal waste storage. Vol. I

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Effects of stent-graft geometry and blood hematocrit on hemodynamic in Abdominal Aortic Aneurysm

Cited by 26 publications

References 13 publications

Computational Fluid Dynamic Accuracy in Mimicking Changes in Blood Hemodynamics in Patients with Acute Type IIIb Aortic Dissection Treated with TEVAR

Computational Fluid Dynamic Accuracy in Mimicking Changes in Blood Hemodynamics in Patients with Acute Type IIIb Aortic Dissection Treated with TEVAR

Effects of interfering gases in electrochemical sensors NH3 and NO2

Hazards associated with municipal waste storage. Vol. I

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Effects of interfering gases in electrochemical sensors NH₃ and NO₂