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Journal articles on the topic 'Stenosis'

Author: Grafiati

Published: 4 June 2021

Last updated: 25 July 2025

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1

Magee, T. R., A. H. Davies, R. N. Baird, and M. Horrocks. "Blood Flow in the Internal Carotid Artery and Velocity in the Middle Cerebral Artery during Carotid Endarterectomy." Cardiovascular Surgery 2, no. 1 (1994): 37–40. http://dx.doi.org/10.1177/096721099400200108.

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A stenosing atherosclerotic plaque of the internal carotid artery acts as a source of emboli and may impede flow. The contribution made by a stenosed carotid artery to cerebral perfusion is unclear. This study examined blood flow in the internal carotid artery and a comparison was made with the effect of clamping on flow velocity in the middle cerebral artery. Some 50 patients were assessed before carotid endarterectomy by preoperative duplex scanning, triplanar arteriography and transcranial Doppler ultrasonography. At operation, maximal flow in the internal carotid artery was measured using

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Al-Azawy, Mohammed Ghalib, Zahraa Ahmed Hamza, and Alaa Ahmed Alkinani. "Non-invasive evaluation of blood flow through a healthy and stenosed coronary artery." Wasit Journal of Engineering Sciences 10, no. 3 (2023): 58–74. http://dx.doi.org/10.31185/ejuow.vol10.iss3.369.

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The current numerical analysis was utilised to compare the hemodynamic effects caused by flow disruptions in coronary arteries with and without stenosis in order to evaluate the hemodynamic importance of patient-specific coronary stenosis using Computational Fluid Dynamics (CFD) to provide information to the public, particularly surgeons, and assist them in reducing the risk of stenosis. Assuming the flow is turbulent and non-Newtonian viscosity, the Carreau model is incorporated by utilizing STAR-CCM+ 2021.2.1. The test model is a patient-specific coronary stenosis with area stenosis (60%). T

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BANERJEE, MOLOY K., DEBABRATA NAG, RANJAN GANGULY, and AMITAVA DATTA. "HEMODYNAMICS IN STENOSED ARTERIES — EFFECTS OF STENOSIS SHAPES." International Journal of Computational Methods 07, no. 03 (2010): 397–419. http://dx.doi.org/10.1142/s021987621000226x.

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A numerical analysis has been carried out to investigate the hemodynamic flow through stenosed arteries having mild (S = 25%) to severe (S = 65%) occlusions and under different regimes of flow Reynolds numbers ( Re ) ranging from 50 to 400. Influence of different stenosis shapes (rectangular, trapezoidal, cosine, and Gaussian) on key hemodynamic parameters e.g., recirculation length, wall shear stress (WSS), pressure drop, and irreversible pressure loss coefficient (C I ) are studied. It has been observed that for S = 25%, no flow separation takes place with cosine and Gaussian shaped stenoses

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4

Liu, H., X. Wu, Y. Xing, K. Liu, and H. Zhang. "Neurology (Stroke)." Canadian Journal of Neurological Sciences / Journal Canadien des Sciences Neurologiques 42, S1 (2015): S36. http://dx.doi.org/10.1017/cjn.2015.165.

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Background: Cerebral artery stenosis is an important risk factor for ischemic strokes. This study aims to explore intracranial and extracranial artery stenosis in a large northeast Chinese cohort. Methods: We recruited 14793 outpatients and hospitalized patients to identify cerebral artery stenosis. Artery stenosis screening was done with transcranial Doppler (TCD) for intracranial arteries and carotid duplex sonography for extracranial arteries. Results: More intracranial than extracranial artery stenoses were identified (4255 versus 2809, i.e. 28.8% versus 19.0%, P<0.05). Similarly, mere

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5

Tong, Y., P. G. Matthews, and J. P. Royle. "Outcome of Endovascular Intervention for Infrainguinal Vein Graft Stenosis." Cardiovascular Surgery 10, no. 6 (2002): 545–50. http://dx.doi.org/10.1177/096721090201000605.

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Assisted graft patency rate following revision of a graft stenosis is far better than that following thrombectomy of an occluded graft. Graft revision by endovascular means has been proposed as a suitable alternative to more invasive surgery. This study reports our experience with endovascular treatment of vein graft stenosis. Between December 1992 and September 2000, percutaneous transluminal balloon angioplasty (PTA) was performed on 90 vein graft stenoses in 87 infrainguinal vein bypass grafts identified by routine graft duplex scan (peak systolic velocity, PSV > 300 cm/sec). All 90 sten

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Liu, Biyue, and Dalin Tang. "Influence of Distal Stenosis on Blood Flow Through Coronary Serial Stenoses: A Numerical Study." International Journal of Computational Methods 16, no. 03 (2019): 1842003. http://dx.doi.org/10.1142/s0219876218420033.

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Computer simulations of the blood flow through right coronary arteries with two stenoses in the same arterial segment are carried out to investigate the interactions of serial stenoses, especially the effect of the distal stenosis. Various mathematical models are developed by varying the location of the distal stenosis. The numerical results show that the variation of the distal stenosis has significant impact on coronary hemodynamics, such as the pressure drop, flow shifting, wall shear stress and flow separation. Our simulations demonstrate that the distal stenosis has insignificant effect o

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7

Lougheed, Nick, Jeff Jaskolka, Rob Beecroft, and Ravi Menezes. "Determination of the Best Parameter for Defining the Hemodynamic Significance of an Iliac Artery Stenosis Detected on Computed Tomography Angiography." Canadian Association of Radiologists Journal 67, no. 3 (2016): 298–303. http://dx.doi.org/10.1016/j.carj.2015.09.005.

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Purpose The purpose of this study was to determine the best parameter, derived from computed tomography angiography (CTA) for accurate prediction of a hemodynamically significant stenosis of the common or external iliac artery. Methods A retrospective keyword search was performed on the Radiology Information System at our tertiary academic medical centre. Reports from January 2008 to September 2013 were searched using the keywords iliac, stenosis, and pressure. Patients who had both and CTA and a pelvic angiogram with pressure measurements obtained across a potential stenosis were selected. Us

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8

Varnava, A. M., and M. J. Davies. "Relation between coronary artery remodelling (compensatory dilatation) and stenosis in human native coronary arteries." Heart 86, no. 2 (2001): 207–11. http://dx.doi.org/10.1136/hrt.86.2.207.

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OBJECTIVESTo investigate the contribution of plaque size and vessel remodelling to coronary artery stenosis and to assess the role of vessel shrinkage (negative remodelling) across a wide range of lesions.DESIGNPostmortem study of coronary remodelling in perfusion fixed hearts.SUBJECTS24 men and 24 women who died suddenly with coronary artery disease.MAIN OUTCOME MEASURESPercentage stenosis, percentage plaque burden, percentage remodelling, and arc of normal vessel were measured and related to age, sex, smoking status, and history of hypertension.RESULTSThere was a positive relation between pe

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9

Loree, H. M., R. D. Kamm, C. M. Atkinson, and R. T. Lee. "Turbulent pressure fluctuations on surface of model vascular stenoses." American Journal of Physiology-Heart and Circulatory Physiology 261, no. 3 (1991): H644—H650. http://dx.doi.org/10.1152/ajpheart.1991.261.3.h644.

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Turbulence frequently develops when blood passes through a stenosis. To study the hypothesis that turbulence near a plaque surface can cause pressure fluctuations that may promote plaque rupture, models of intravascular stenoses were studied. Experimental conditions simulated peak flow in the coronary and carotid arteries through a stenosis of 80 or 90% diameter reduction and into a region where the plaque had widened distally to a 50-75% stenosis. For symmetric stenoses at carotid artery flow rates, peak pressure fluctuations were observed 1-1.5 upstream diameters distal to the stenosis, but

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10

Tirinescu, Dacian Călin, Cosmina Ioana Bondor, Dan Ştefan Vlăduțiu, et al. "Ultrasonographic diagnosis of stenosis of native arteriovenous fistulas in haemodialysis patients." Medical Ultrasonography 18, no. 3 (2016): 332. http://dx.doi.org/10.11152/mu.2013.2066.183.fis.

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Aims: Ultrasound (US) examination is an important tool in the diagnosis of arteriovenous (AVF) stenoses; different US measures are available for assessing the severity of stenoses. The aim of our study was to analyse risk factors and consequences of AVF stenosis and its severity and to compare the usefulness of different US measures of stenoses’ severity. Material and methods: Ninety-seven prevalent patients from a single dialysis centre with patent AVF were included. We recorded history of disease, clinical and laboratory data. US was used to diagnosis the stenosis and to measure blood flow i

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He, Fan, Lu Hua, and Tingting Guo. "Fluid–structure interaction analysis of hemodynamics in different degrees of stenoses considering microcirculation function." Advances in Mechanical Engineering 13, no. 1 (2021): 168781402198901. http://dx.doi.org/10.1177/1687814021989012.

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In developed countries, stenosis is the main cause of death. To investigate hemodynamics within different degrees of stenoses, a stenosis model incorporating fluid–structure interaction and microcirculation function is used in this paper. Microcirculation is treated as a seepage outlet boundary condition. Compliant arterial wall is considered. Numerical simulation based on fluid–structure interaction is performed using finite element method. Our results indicate that (i) the increasing degree of stenosis makes the pressure drop increase, and (ii) the wall shear stress and the velocity in the a

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12

House, A. K., R. Bell, J. House, F. Mastaglia, A. Kumar, and M. D'Antuono. "Asymptomatic Carotid Artery Stenosis Associated with Peripheral Vascular Disease: A Prospective Study." Cardiovascular Surgery 7, no. 1 (1999): 44–49. http://dx.doi.org/10.1177/096721099900700110.

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This study aimed to determine the prevalence of symptomless internal carotid artery stenosis in consecutive patients presenting with peripheral vascular disease. Duplex ultrasound screening of the carotid arteries was used to determine the degree of stenosis. Co-morbidities were recorded together with age, sex and tobacco use. Internal carotid artery stenosis of > 50% was found in 35% of patients. Among these there was ≥ 70% stenosis in 18% of patients and of this group 5% had an occluded carotid vessel at first presentation. Males presented with peripheral vascular disease and associated c

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13

Schwartz, J. S., and R. J. Bache. "Effect of arteriolar dilation on coronary artery diameter distal to coronary stenoses." American Journal of Physiology-Heart and Circulatory Physiology 249, no. 5 (1985): H981—H988. http://dx.doi.org/10.1152/ajpheart.1985.249.5.h981.

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Previous studies have suggested that worsening hemodynamic severity of coronary stenoses in response to distal arteriolar dilation may be related to dilation of the normal epicardial artery adjacent to the stenosis resulting in increasing percent stenosis. To test this hypothesis we used sonomicrometry to continuously measure external circumflex coronary artery diameter distal to snare stenoses of varying severity in 19 open-chest dogs and 5 awake, chronically instrumented dogs. Arteriolar dilation produced by release of a transient coronary occlusion or by intracoronary injection of adenosine

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14

Intan Diyana Munir, Nurul Aini Jaafar, and Sharidan Shafie. "Solute Dispersion in an Unsteady Herschel-Bulkley Flow through an Inclined Stenosed Arter." Journal of Advanced Research in Numerical Heat Transfer 14, no. 1 (2023): 29–38. http://dx.doi.org/10.37934/arnht.14.1.2938.

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Motivated by the concept of blood flow in a stenosed artery, this present research investigates the influence of stenosis shape in terms of height and arterial inclination on the blood flow and solute dispersion behaviour through an inclined stenosed artery. The blood rheology is depicted using the Herschel-Bulkley model in a laminar, axisymmetric and incompressible unsteady flow through the stenosed artery. The effect of stenosis is focused on the stenosis height for both sine and cosine stenosis. Parameters of arterial inclination are also investigated to observe the effect of inclination on

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15

Su, C. M., D. Lee, R. Tran-Son-Tay, and W. Shyy. "Fluid Flow Structure in Arterial Bypass Anastomosis." Journal of Biomechanical Engineering 127, no. 4 (2005): 611–18. http://dx.doi.org/10.1115/1.1934056.

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The fluid flow through a stenosed artery and its bypass graft in an anastomosis can substantially influence the outcome of bypass surgery. To help improve our understanding of this and related issues, the steady Navier-Stokes flows are computed in an idealized arterial bypass system with partially occluded host artery. Both the residual flow issued from the stenosis—which is potentially important at an earlier stage after grafting—and the complex flow structure induced by the bypass graft are investigated. Seven geometric models, including symmetric and asymmetric stenoses in the host artery,

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16

Tang, D., J. Yang, C. Yang, and D. N. Ku. "A Nonlinear Axisymmetric Model With Fluid–Wall Interactions for Steady Viscous Flow in Stenotic Elastic Tubes." Journal of Biomechanical Engineering 121, no. 5 (1999): 494–501. http://dx.doi.org/10.1115/1.2835078.

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Arteries with high-grade stenoses may compress under physiologic conditions due to negative transmural pressure caused by high-velocity flow passing through the stenoses. To quantify the compressive conditions near the stenosis, a nonlinear axisymmetric model with fluid–wall interactions is introduced to simulate the viscous flow in a compliant stenotic tube. The nonlinear elastic properties of the tube (tube law) are measured experimentally and used in the model. The model is solved using ADINA (Automatic Dynamic Incremental Nonlinear Analysis), which is a finite element package capable of so

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Rigatelli, Gianluca, Marco Zuin, Niva Mileva, et al. "Reduced Shear Stress and Longer Blood Flow Time Occur in Both Severe Focal and Mild Diffuse LAD Lesions: Angiograms Alone Don’t Always Reveal Their True Impact on Blood Flow." Pathophysiology 32, no. 2 (2025): 28. https://doi.org/10.3390/pathophysiology32020028.

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Background/Objectives: The similarities and differences from a rheological perspective between significant short focal and mild long coronary lesions warrant investigation to elucidate wall shear stress (WSS) angiographic discrepancies. Methods: Patients who underwent coronary computed tomography angiography (CCTA) between 1 January 2023 and 1 September 2024 were selected for computational fluid dynamics (CFD) analysis. The selection criteria included either a focal (≤20 mm) hemodynamically significant stenosis, defined as ≥75% lumen narrowing, or a long (30–40 mm) non-hemodynamically signific

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Morisaki, Yudai, Ichiro Nakagawa, Koji Omoto, Takeshi Wada, Kimihiko Kichikawa, and Hiroyuki Nakase. "Endovascular treatment of idiopathic intracranial hypertension caused by multiple venous sinus stenoses." Surgical Neurology International 10 (March 26, 2019): 47. http://dx.doi.org/10.25259/sni-94-2019.

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Background: Idiopathic intracranial hypertension (IIH) shows symptoms by elevating intracranial pressure. Although sinus stenosis has been detected in many patients with IIH, the role of sinus stenosis in IIH remains obscure. Endovascular treatment for IIH due to transverse sinus stenosis has been frequently documented; however, IIH due to multiple sinus stenoses including the superior sagittal sinus (SSS) is rare. Here, we report a case of IIH due to multiple sinus stenoses treated by sinus stenting. Case Presentation: A 47-year-old woman suffered from intractable headache with IIH presented

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Durst, Christopher R., David A. Ornan, Michael A. Reardon, et al. "Prevalence of dural venous sinus stenosis and hypoplasia in a generalized population." Journal of NeuroInterventional Surgery 8, no. 11 (2016): 1173–77. http://dx.doi.org/10.1136/neurintsurg-2015-012147.

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Background and purposeWhile recent literature has described the prevalence of transverse sinus stenosis in patients with idiopathic intracranial hypertension, tinnitus, and refractory headaches, it is unclear what the prevalence is in the general population. This study evaluates the prevalence of venous sinus stenosis and hypoplasia in the general patient population.Materials and methods355 of 600 consecutive patients who underwent CT angiography of the head met the inclusion criteria. The diameters of the dural venous sinuses were recorded. Each study was evaluated by a neuroradiologist for t

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20

Graziotti, P. P., A. Piccinelli, L. Faggiano, M. Scanzi, and A. Calabrò. "Urethral Stenosis following Transurethral Resection." Urologia Journal 59, no. 1 (1992): 50–52. http://dx.doi.org/10.1177/039156039205900111.

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The authors report the results of a multicentric prospective study on risk factors related to post-TURP stenosis. 47 different parameters were considered and 21 urethral stenoses (9% of 234 patients) are reported. Meatal stenoses are included, but were not considered for statistical correlation with other sites. Final data, statistically examined, show that electrotomes (Martin/Danieli), urethral lubricant and rubber catheters, singly or jointly, are possibly related to post-TURP urethral stenosis.

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Spaetgens, Renée L., Walter J. Duncan, and Glenn P. Taylor. "Supravalvar aortic stenosis with supravalvar pulmonary stenosis and peripheral vascular stenoses." Cardiology in the Young 12, no. 3 (2002): 290–93. http://dx.doi.org/10.1017/s104795110200063x.

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A non-dysmorphic 10 month old female was discovered at surgery to have severe vasculopathy of both the systemic and pulmonary arteries. These findings were confirmed by pathologic examination. Followup angiography has confirmed multiple sites of vascular obstruction which appear to be worsening. Angioplasty has only partially relieved these obstructions. The pathology and possible etiology are reviewed.

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Razumnikova, O. M., I. V. Tarasova, O. A. Trubnikova, and O. L. Barbarash. "The changes in the structure of cognitive functions and anxiety in cardiac surgery patients depending on the severity of carotid arteries." Complex Issues of Cardiovascular Diseases 11, no. 1 (2022): 36–48. http://dx.doi.org/10.17802/2306-1278-2022-11-1-36-48.

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Highlights. The article revealed that severe (more than 50%) carotid artery (CA) stenosis was associated with significant slowdown of the information selection processes, and these patients were characterized by older age and tendency to an increase in trait anxiety compared to the patients without CA stenosis.It was found that the reduced attention and memory was a typical feature of the cognitive status in patients with severe CA stenosis in the early postoperative period of cardiac surgery in comparison with the patients without CA stenosis. At the same time the speed characteristics indica

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Strony, J., A. Beaudoin, D. Brands, and B. Adelman. "Analysis of shear stress and hemodynamic factors in a model of coronary artery stenosis and thrombosis." American Journal of Physiology-Heart and Circulatory Physiology 265, no. 5 (1993): H1787—H1796. http://dx.doi.org/10.1152/ajpheart.1993.265.5.h1787.

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Shear stress and alterations in blood flow within a stenosed artery promote platelet-dependent thrombosis. Using the Folts model of coronary thrombosis, we evaluated morphology, histology, and the hemodynamic properties of the stenosed vessel in 18 animals. The average stenosis created was 58 +/- 8%, with stenosed vessel diameters ranging from 0.084 to 0.159 cm. Histological examination of the stenosed vessel demonstrated that thrombi were composed primarily of platelets and formation occurred 1.0 mm downstream from the apex of the constriction, propagating distally. Peak shear stress occurred

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Haas, Leandro José, Bernardo Przysiezny, Thaize Regina Scramocin, et al. "Using the Casper Stent in Carotid Angioplasty: A Single Center Experience." Arquivos Brasileiros de Neurocirurgia: Brazilian Neurosurgery 41, no. 01 (2022): e1-e6. http://dx.doi.org/10.1055/s-0041-1740405.

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Abstract Objectives To establish the success rate in endovascular internal carotid artery (ICA) stenosis recanalization using the double-layer stent Casper-RX (Microvention, Inc 35 Enterprise, Aliso Viejo, California, United States of America) and to identify the main comorbidities in individuals with ICA stenosis, morphological characteristics of the stenosis, diagnostic methods, intraoperative complications, as well as morbidity and mortality within 30 days of the surgical procedure. Materials and Methods Retrospective analysis of 116 patients undergoing ICA angioplasty with a degree of sten

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de Waard, Guus A., Christopher J. Broyd, Christopher M. Cook, et al. "Diastolic-systolic velocity ratio to detect coronary stenoses under physiological resting conditions: a mechanistic study." Open Heart 6, no. 1 (2019): e000968. http://dx.doi.org/10.1136/openhrt-2018-000968.

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ObjectiveDiastolic-systolic velocity ratio (DSVR) is a resting index to assess stenoses in the left anterior descending artery (LAD). DSVR can be measured by echocardiographic or intracoronary Doppler flow velocity. The objective of this cohort study was to elucidate the fundamental rationale underlying the decreased DSVR in coronary stenoses.MethodsIn cohort 1, simultaneous measurements of intracoronary Doppler flow velocity and pressure were acquired in the LAD of 228 stable patients. Phasic stenosis resistance, microvascular resistance and total vascular resistance (defined as stenosis and

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Czaja, Judith M., and Thomas V. McCaffrey. "Acoustic Measurement of Subglottic Stenosis." Annals of Otology, Rhinology & Laryngology 105, no. 7 (1996): 504–9. http://dx.doi.org/10.1177/000348949610500702.

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A device that determines cross-sectional area (CSA) of the airway by acoustic ref lections (Hood, Inc) was used to measure subglottic area. Airway models were made from Plexiglas rings with known internal dimensions similar to clinically encountered stenoses of various lengths and diameters. Acoustic measurements of airway area were made and compared to actual CSA. There is a strong correlation between CSA measured acoustically and the actual area of simulated stenoses. However, when the CSA of the stenosis was <0.64 cm2, the signal was impaired, resulting in overestimation of the stenotic

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BATYRBEKOV, K., A. GALIAKBAROVA, and A. UALIKHANOV. "ENDOSCOPIC BOUGIENAGE OF BENIGN ESOPHAGEAL STRICTURES USING A BOUGIE CAP." Oncologia i radiologia Kazakhstana 3, no. 73 (2024): 32–36. https://doi.org/10.52532/2663-4864-2024-3-73-32-36.

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Relevance: Esophageal stricture is a narrowing of the lumen of the esophageal tube caused by the proliferation of connective tissue in its wall. This condition can develop against the background of esophagitis, peptic ulcers, chemical burns of the esophagus, and iatrogenic causes. Cicatricial changes of the esophagus occupy the second place among diseases of this organ after esophagitis and are formed in 70-80% of patients with postburn strictures.The study aimed to analyze the results of endoscopic treatment of benign esophageal stenosis using distal Bougie Cap caps and evaluate the effective

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Schirmer, Clemens M., and Adel M. Malek. "WALL SHEAR STRESS GRADIENT ANALYSIS WITHIN AN IDEALIZED STENOSIS USING NON-NEWTONIAN FLOW." Neurosurgery 61, no. 4 (2007): 853–64. http://dx.doi.org/10.1227/01.neu.0000298915.32248.95.

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Abstract OBJECTIVE The endothelium is functionally regulated by the magnitude and spatiotemporal gradients of wall shear stress (WSS). Although flow separation and reversal occur beyond high-grade stenoses, little is known of the WSS pattern within clinically relevant mild to moderate stenoses. METHODS An axisymmetric geometry with 25, 50, and 75% stenosis criteria (quantified in accordance with the North American Symptomatic Carotid Endarterectomy Trial) was used to generate a high-resolution, hybrid, tetrahedral-hexahedral computational mesh with boundary-layer enrichment to improve near-wal

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Bexell, Daniel, Randolph M. Setser, Paul Schoenhagen, et al. "Influence of Coronary Artery Stenosis Severity and Coronary Collateralization on Extent of Chronic Myocardial Scar: Insights from Quantitative Coronary Angiography and Delayed-Enhancement MRI." Open Cardiovascular Medicine Journal 2, no. 1 (2008): 79–86. http://dx.doi.org/10.2174/1874192400802010079.

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Objectives:In patients with chronic ischemic heart disease, the relationship between coronary artery lesion severity and myocardial scarring is unknown.The purpose of this study was to examine the relationship between proximal coronary artery stenosis severity, the amount of coronary collateralization, and myocardial scar extent in the distal distribution of the affected coronary artery based on both quantitative coronary angiography (QCA) and delayed-enhancement magnetic resonance imaging (DE–MRI).Methods:Thirty-four patients (26 males, 8 females; age range: 35-86 years) with a coronary arter

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Koennecke. "Carotid stenosis - When is revascularization appropriate?" Vasa 38, no. 3 (2009): 203–11. http://dx.doi.org/10.1024/0301-1526.38.3.203.

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Approximately 15% of ischemic strokes are caused by extracranial carotid stenoses. Revascularization of a symptomatic stenosis is very efficacious in carefully selected patients. This review outlines criteria which help to identify those who will benefit most from carotid endarterectomy (CEA) for symptomatic stenosis. Asymptomatic carotid stenosis is a common condition in the general population over 50 years, but nonetheless associated with a low risk of ischemic stroke. Consequently, the therapeutic yield of CEA is much lower in asymptomatic stenosis and women seem not to benefit at all. In t

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Erkenova, A. M., N. M. Danilov, Yu G. Matchin, V. V. Kushnir, S. A. Gaman та I. E. Chazova. "Оценка чувствительности методов диагностики в выявлении гемодинамически значимых односторонних стенозов почечных артерий". Eurasian heart journal, № 2 (27 травня 2024): 78–85. http://dx.doi.org/10.38109/2225-1685-2024-2-78-85.

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Objective. Assessment of renal artery stenosis significance in patients with resistant arterial hypertension using non-invasive diagnostic methods and to compare them with the results of selective angiography and methods of physiological assessment of renal artery stenoses.Materials and methods. Prospectively, 156 patients with drug-resistant arterial hypertension and signs of renal artery stenosis detected by doppler ultrasonography of renal arteries were included in the study. Subsequently, 25 patients were excluded from the study due to multiple variant renal blood supply and bilateral rena

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Duncavage, James A., Robert H. Ossoff, and Robert J. Toohill. "Carbon Dioxide Laser Management of Laryngeal Stenosis." Annals of Otology, Rhinology & Laryngology 94, no. 6 (1985): 565–69. http://dx.doi.org/10.1177/000348948509400608.

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A retrospective review of 20 cases of laryngeal stenosis treated with the carbon dioxide laser was conducted at the Medical College of Wisconsin and Northwestern University. The stenoses were grouped into four categories: supraglottic, glottic, subglottic, and combined glottic-subglottic. Twenty patients had 21 lesions excised by 40 laser procedures. Eleven of 21 stenoses were successfully managed by carbon dioxide laser endoscopy: 3 of 3 supraglottic, 6 of 10 glottic, 2 of 4 subglottic, and 0 of 4 combined laryngeal/tracheal stenoses. Eleven of the 20 patients had significant airway improveme

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Awasthi, Chhama, and S.U. Siddiqui. "Pulsatile Bingham Plastic Fluid Flow through an Inclined Asymmetric Stenosed Artery." International Journal of Science and Social Science Research 1, no. 1 (2024): 01–12. https://doi.org/10.5281/zenodo.13328064.

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The cardiovascular disease patients are more at risk of having stenosis disease due to blocked and narrowed bloodarteries. The need of creating a mathematical model to recognize and understand the hemodynamic characteristics of bloodrheology cannot be overstated. The current work uses erratic blood flow through an inclined stenosed artery and treats blood asa non-Newtonian fluid, such as Bingham Plastic fluid. The Perturbation approach has been used to solve the non-lineardifferential equations of the aforementioned mathematical model combined with the suitable boundary conditions guiding thef

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Bulger, Christopher M., Weihua Gao, Chad Jacobs, and Walter J. McCarthy. "Beyond the Categories: A Formula-Driven Prediction of Carotid Stenosis." Journal for Vascular Ultrasound 29, no. 1 (2005): 15–20. http://dx.doi.org/10.1177/154431670502900102.

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Purpose Current methods to predict carotid stenosis from ultrasound duplex criteria involve assigning a category of stenosis on the basis of an individual laboratory-defined combination of peak systolic velocity (PSV), end diastolic velocity (EDV), and ratio of internal carotid artery velocity to common carotid artery velocity. This study will define a formula by use of regression analysis of the duplex ultrasound criteria compared with the angiographic results. This study will then compare the formula predictions of stenosis with the current means of combining categories to determine whether

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Ito, Hideki, Masato Mutsuga, Yoshiyuki Tokuda, and Akihiko Usui. "Modified sutureless repair using left atrial appendage flap for acquired left-sided pulmonary vein stenosis." European Journal of Cardio-Thoracic Surgery 58, no. 2 (2020): 395–97. http://dx.doi.org/10.1093/ejcts/ezaa032.

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Abstract Pulmonary vein stenosis is a well-known complication after radiofrequency catheter ablation of atrial fibrillation. Although surgical repair is indicated for younger patients and patients with multiple stenoses, the appropriate procedure for acquired pulmonary vein stenosis has not been established. In this study, we report the successful outcome of our modified sutureless technique using a left atrial appendage flap for left-sided pulmonary vein stenosis after radiofrequency catheter ablation.

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Ito, Hidemichi, Masashi Uchida, Taigen Sase, et al. "A case of tandem stenoses at the proximal common and internal carotid arteries treated with transbrachial stenting: a case report." Interventional Neuroradiology 25, no. 2 (2018): 225–29. http://dx.doi.org/10.1177/1591019918806471.

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The transfemoral approach is a common technique for carotid artery stenting. However, it has the risk of distal embolism when stenting for a stenosis of the proximal common carotid artery because of poor stability of the guiding catheter resulting in difficulty in setting the embolic protection device prior to stenting. We present a novel therapeutic approach and technique for the treatment of tandem carotid stenoses including the proximal common carotid artery. A 63-year-old man presented with double stenoses at the common carotid artery and internal carotid artery. We used a transbrachial sh

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Nordmeyer, Hannes, René Chapot, and Patrick Haage. "Endovascular Treatment of Intracranial Atherosclerotic Stenosis." RöFo - Fortschritte auf dem Gebiet der Röntgenstrahlen und der bildgebenden Verfahren 191, no. 07 (2019): 643–52. http://dx.doi.org/10.1055/a-0855-4298.

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Background Intracranial atherosclerotic stenosis (ICAS) causes 5 – 10 % of all ischemic strokes in the European population. Indication for endovascular treatment is a special challenge and the selection of material as well as interventional techniques essentially differs from the treatment of extracranial stenoses. According to recent studies patient selection became evidence based; however the method should not be abandoned. New technical approaches can contribute to avoid complications. Method We performed a review of the literature with regard to conservative as well as endovascular treatme

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Hofstra, L., D. C. Bergmans, K. M. Leunissen, et al. "Anastomotic intimal hyperplasia in prosthetic arteriovenous fistulas for hemodialysis is associated with initial high flow velocity and not with mismatch in elastic properties." Journal of the American Society of Nephrology 6, no. 6 (1995): 1625–33. http://dx.doi.org/10.1681/asn.v661625.

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Stenotic intimal thickening at the venous end of prosthetic arteriovenous (AV) fistulas for hemodialysis has been associated with perianastomotic mismatch in elastic properties, and low shear rates. In a prospective way, the role of these factors on the occurrence of intimal hyperplasia in prosthetic AV fistulas in hemodialysis patients was investigated. In 24 hemodialysis patients, the elastic properties were assessed in the distal graft segment and the outflow vein postoperatively with the use of Vessel Wall Doppler Tracking (VWDT), a noninvasive ultrasound technique. In addition, normalized

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Miklusica, J., I. Dedinska, B. Palkoci, et al. "Ureteral Stenosis of Transplanted Kidney." Acta Medica Martiniana 17, no. 2 (2017): 32–40. http://dx.doi.org/10.1515/acm-2017-0010.

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AbstractIntroduction: Ureteral stenosis is one of the most commonly reported urological complications after kidney transplantation. Material and methods: This is a retrospective analysis of the risk factors for ureteral stenosis (type of donor, age of donor, presence of interior polar arteria, unilateral dual transplantation, diabetes mellitus of the recipient and the donor, BK positivity, child recipient, cold ischaemia time, and delayed graft function), as well as the causes and types of treating ureteral stenoses. Results: In the group of 278 patients, the occurrence was 7.2 %. The medial o

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Depairon, Michèle, C. P. Ferrier, P. Tutta, E. Descombes, G. van Melle, and J. P. Wauters. "Stellenwert der Duplexsonographie der Brachialarterie zur Überwachung von vaskulären Zugängen bei Hämodialysepatienten." Vasa 30, no. 1 (2001): 53–58. http://dx.doi.org/10.1024/0301-1526.30.1.53.

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Background: Vascular access (VA) stenosis with subsequent thrombosis remains one of the major causes of morbidity and hospitalization in haemodialysis patients. The present cross-sectional study was planned in order to analyze the usefulness of brachial artery duplex ultrasound for detection and prediction of vascular access stenoses. Methods: Color duplex ultrasound (Apogée Cx 200, sectorial probe 7.5 MHz) was used to obtain the anatomical pattern of the VA and flow velocity waveforms of the brachial artery in 77 non-selected VA (47 Ciminio-Brescia fistulae and 30 PTFE grafts). In each VA, th

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Krajíčková, Dagmar, Antonín Krajina, Roman Herzig, et al. "Percutaneous Transluminal Angioplasty for Atherosclerotic Stenosis of Vertebral Artery Origin." Journal of Clinical Medicine 13, no. 14 (2024): 4010. http://dx.doi.org/10.3390/jcm13144010.

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Background: In patients with vertebral artery origin (VAO) stenosis and concomitant stenoses of other cerebral feeding arteries, data on the risk of percutaneous transluminal angioplasty (PTA) alone and with stent placement (PTAS) for VAO stenosis are limited. We aimed to determine how the presence of polystenotic lesions in other cerebral feeding arteries and concomitant carotid artery stenting (CAS) affect the periprocedural risk and long-term effect of PTA/S for atherosclerotic VAO stenosis. Methods: In a retrospective descriptive study, consecutive patients treated with PTA/S for ≥70% VAO

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Cao, Xiangyu, Jun Wang, Chenglin Tian, et al. "Solitaire AB stent-angioplasty for stenoses in perforator rich segments: A single-center experience." Interventional Neuroradiology 26, no. 5 (2020): 608–14. http://dx.doi.org/10.1177/1591019920951651.

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Background Vascular angioplasty and stenting of middle cerebral artery (MCA) and basilar artery (BA) stenoses are associated with poor clinical outcomes and high mortality rates thought to be related to the abundance of perforating arteries in those segments. This study explores the use of Solitaire AB as an off-label vascular stent to treat stenoses in the MCA and BA. Methods Solitaire AB stents were placed during angioplasty and stenting of MCA and BA stenoses in patients at our department between January 2015 and May 2017 with 6-36 months follow-up. Operative results were assessed by follow

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Terada, T., H. Yokote, Y. Kinoshita, et al. "Endovascular Treatment for Tandem Internal Carotid Stenosis." Interventional Neuroradiology 3, no. 2_suppl (1997): 208–11. http://dx.doi.org/10.1177/15910199970030s245.

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Three patients with tandem internal carotid stenoses were treated in one operation including carotid endarterectomy (CEA) for the proximal stenosis and percutaneous transluminal angioplasty (PTA) for the distal stenosis. We devised a Y-shaped shunt tube which we used for CEA, while a PTA balloon catheter was introduced via the tube to perform PTA guided by portable digital subtraction angiography (DSA). No cerebrovascular events occurred during follow-up. Our approach avoids the risk of a second procedure while effectively treating tandem stenoses.

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SCHOENBERG, STEFAN O., MICHAEL BOCK, FRIEDRICH KALLINOWSKI, and ARMIN JUST. "Correlation of Hemodynamic Impact and Morphologic Degree of Renal Artery Stenosis in a Canine Model." Journal of the American Society of Nephrology 11, no. 12 (2000): 2190–98. http://dx.doi.org/10.1681/asn.v11122190.

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Abstract. In a noninvasive comprehensive magnetic resonance (MR) examination, the morphologic degree of renal artery stenosis was correlated to corresponding changes in renal artery flow dynamics. Different degrees of stenosis were created with the use of a chronically implanted inflatable arterial cuff in seven dogs. For each degree of stenosis, an ultrafast three-dimensional gadolinium MR angiography with high spatial resolution was performed, followed by cardiac-gated MR flow measurements with high temporal resolution for determination of pulsatile flow profiles and mean flow. Flow was also

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Aksenova, T. A., K. E. Belomestnova, A. K. Lyapunova, et al. "Detection of hidden coronary insufficiency in persons ensuring the safety of train traffic on the Trans-Baikal Railway." Acta Biomedica Scientifica 10, no. 1 (2025): 85–92. https://doi.org/10.29413/abs.2025-10.1.9.

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The aim of the study. To conduct preclinical diagnosis of ischemic heart disease and to identify latent coronary insufficiency in persons involved in traffic safety in railway transport.Materials and methods. A cross-sectional study of 108 working male railway workers whose duty is ensuring the safety of railway traffic was conducted. These patients were selected as having high-grade arrhythmias (56.2 %) or non-specific disorders of repolarization processes on the ECG (43.8 %), which was an indication for coronary angiography. All patients underwent echocardiography, ECG, Holter monitoring wit

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McCAffrey, Thomas V. "Management of Laryngotracheal Stenosis on the Basis of Site and Severity." Otolaryngology–Head and Neck Surgery 109, no. 3 (1993): 468–73. http://dx.doi.org/10.1177/019459989310900313.

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Seventy-five cases of laryngotracheal stenosis treated between 1981 and 1991 were reviewed to determine the effectiveness of surgical treatment on the basis of site and severity of stenosis. Decannulation and absence of exertional dyspnea were the criteria of successful management. The treatment methods used were endoscopic laser incision and dilatation, expansion laryngotracheoplasty, and segmental resection. Endoscopic procedures were effective in treating thin (< 1 cm) stenoses in the subglottis and trachea. Laryngotracheoplasty was most effective in treating thick stenoses of the glotti

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Li, Xiaoyun, Ling Wang, Chi Zhang, et al. "Why Is ABI Effective in Detecting Vascular Stenosis? Investigation Based on Multibranch Hemodynamic Model." Scientific World Journal 2013 (2013): 1–10. http://dx.doi.org/10.1155/2013/185691.

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The ankle-brachial index (ABI), defined as the ratio of systolic pressure in the ankle arteries and that in the brachial artery, was a useful noninvasive method to detect arterial stenoses. There had been a lot of researches about clinical regularities of ABI; however, mechanism studies were less addressed. For the purpose of a better understanding of the correlation between vascular stenoses and ABI, a computational model for simulating blood pressure and flow propagation in various arterial stenosis circumstances was developed with a detailed compartmental description of the heart and main a

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Siebes, Maria, Steven A. J. Chamuleau, Martijn Meuwissen, Jan J. Piek, and Jos A. E. Spaan. "Influence of hemodynamic conditions on fractional flow reserve: parametric analysis of underlying model." American Journal of Physiology-Heart and Circulatory Physiology 283, no. 4 (2002): H1462—H1470. http://dx.doi.org/10.1152/ajpheart.00165.2002.

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Pressure-based fractional flow reserve (FFR) is used clinically to evaluate the functional severity of a coronary stenosis, by predicting relative maximal coronary flow (Qs/Qn). It is considered to be independent of hemodynamic conditions, which seems unlikely because stenosis resistance is flow dependent. Using a resistive model of an epicardial stenosis (0–80% diameter reduction) in series with the coronary microcirculation at maximal vasodilation, we evaluated FFR for changes in coronary microvascular resistance ( R cor= 0.2–0.6 mmHg · ml−1 · min), aortic pressure (Pa = 70–130 mmHg), and co

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Santamore, W. P., and A. A. Bove. "A theoretical model of a compliant arterial stenosis." American Journal of Physiology-Heart and Circulatory Physiology 248, no. 2 (1985): H274—H285. http://dx.doi.org/10.1152/ajpheart.1985.248.2.h274.

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Recent clinical and experimental evidence indicates that coronary artery stenoses may rapidly change their size and shape in response to alterations in vasomotor tone and intraluminal pressure. This theoretical study models a partially compliant arterial stenosis to examine the hemodynamic impact of these alterations. In rigid vessels, a 98% reduction in luminal area would predictably produce subendocardial ischemia in the resting state. In contrast, stenoses, with part of the arterial wall normal by the underlying plaque, responded to vasoconstriction and to changes in intraluminal pressure.

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Hashimoto, M., O. Watanabe, and H. Hirano. "Extraforaminal Stenosis in the Lumbosacral Spine." Acta Radiologica 37, no. 3P2 (1996): 610–13. http://dx.doi.org/10.1177/02841851960373p238.

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Purpose: To review experience with MR images of extraforaminal (EF) stenosis in the lumbosacral spine. Material: MR images from 9 patients with 10 EF stenoses were reviewed. The diagnosis was confirmed in 6 patients at surgery, and in 4 on the basis of findings of nerve root injection combined with nerve block. Results and Conclusion: All patients had congenital lumbosacral anomalies with various degrees of fixation between the last formed level and the pelvis. In all cases, affected roots were compressed between the transverse process of the last lumbar segment and the sacral ala. MR using co

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