Vessel size, investments and trade

2018 ◽  
pp. 518-538
Author(s):  
Lixian Fan ◽  
Xinlu Li ◽  
Sijie Zhang ◽  
Zimeng Zhang
Keyword(s):  
Vessel Size

scholarly journals A novel computer-aided tree-ring analysis software (CATS): oak earlywood vessel size reveals a clear spring heat sum response

Trees ◽  
2017 ◽  
Vol 31 (5) ◽  
pp. 1683-1695 ◽  
Author(s):  
Alexander Land ◽  
Matthias Wehr ◽  
Kai-Uwe Roelfs ◽  
Simon Epkes ◽  
Daniel Reichle ◽  
...  
Keyword(s):  
Tree Ring ◽  
Analysis Software ◽  
Tree Ring Analysis ◽  
Vessel Size ◽  
Computer Aided ◽  
Earlywood Vessel ◽  
Ring Analysis

Collapse of Arteries Subjected to an External Band of Pressure

1980 ◽  
Vol 102 (1) ◽  
pp. 8-22 ◽  
Author(s):  
A. M. Hecht ◽  
H. Yeh ◽  
S. M. K. Chung
Keyword(s):  
Reynolds Number ◽  
Blood Flow ◽  
Cylindrical Shell ◽  
Orthotropic Cylindrical Shell ◽  
Reynolds Numbers ◽  
Intraluminal Pressure ◽  
Collapse Pressure ◽  
Vessel Size ◽  
Flow Reynolds Number ◽  
Small Band

Collapse of arteries subjected to a band of hydrostatic pressure of finite length is analyzed. The vessel is treated as a long, thin, linearly elastic, orthotropic cylindrical shell, homogeneous in composition, and with negligible radial stresses. Blood in the vessel is treated as a Newtonian fluid and the Reynolds number is of order 1. Results are obtained for effects of the following factors on arterial collapse: intraluminal pressure, length of the pressure band, elastic properties of the vessel, initial stress both longitudinally and circumferentially, blood flow Reynolds number, compressibility, and wall thickness to radius ratio. It is found that the predominant parameter influencing vessel collapse for the intermediate range of vessel size and blood flow Reynolds numbers studied is the preconstricted intraluminal pressure. For pressure bands less than about 10 vessel radii the collapse pressure increases sharply with increasing intraluminal pressure. Initial axial prestress is found to be highly stabilizing for small band lengths. The effects of fluid flow are found to be small for pressure bands of less than 100 vessel radii. No dramatic orthotropic vessel behavior is apparent. The analysis shows that any reduction in intraluminal pressure, such as that produced by an upstream obstruction, will significantly lower the required collapse pressure. Medical implications of this analysis to Legg-Perthes disease are discussed.

Vasomotor Responses of Rat Coronary Arteries to Isoflurane and Halothane Depend on Preexposure Tone and Vessel Size

1995 ◽  
Vol 83 (6) ◽  
pp. 1323-1330 ◽  
Author(s):  
K. W. Park ◽  
H. B. Dai ◽  
E. Lowenstein ◽  
F. W. Sellke
Keyword(s):  
Coronary Arteries ◽  
Volatile Anesthetic ◽  
Experimental Setup ◽  
Vessel Size ◽  
Vasomotor Responses ◽  
Small Resistance

Abstract Background The authors previously reported that in rabbits, isoflurane exhibited a heterogeneous vasomotor effect, constricting small resistance coronary arteries and dilating larger conductance arteries. The novelty of isoflurane-induced constriction of small coronary arteries raised the question of whether the finding depended on the unique experimental setup or species used. The purpose of this study was to address these questions. Therefore, a second species was studied, namely rats, as well as a second volatile anesthetic, halothane. In addition, the dependence of the vasomotor effect on the preexisting tone of the vessels was examined.

scholarly journals 909-26 There are Gender-Related Differences in Vessel Size, but not In Target Lesion Plaque Composition: A Pre-Intervention Intravascular Ultrasound Study

1995 ◽  
Vol 25 (2) ◽  
pp. 62A
Author(s):  
Gary S. Mintz ◽  
Jeffrey J. Popma ◽  
Augusto D. Pichard ◽  
Kenneth M. Kent ◽  
Lowell F. Satler ◽  
...  
Keyword(s):  
Intravascular Ultrasound ◽  
Target Lesion ◽  
Plaque Composition ◽  
Vessel Size ◽  
Ultrasound Study

Abstract P33: Blind Exchange With the Mini-Pinning Technique Using Tron Fx Retriever for M2 Occlusion Thrombectomy

Stroke ◽  
2021 ◽  
Vol 52 (Suppl_1) ◽  
Author(s):  
Takeshi Yoshimoto
Keyword(s):  
Stent Retriever ◽  
National Institutes Of Health ◽  
Modified Rankin Scale ◽  
Target Vessel ◽  
Stroke Patients ◽  
Technical Improvement ◽  
Vessel Size ◽  
Blind Navigation ◽  
First Pass ◽  
Stent Retrievers

Introduction: Technical improvement to enhance M2 occlusion thrombectomy is desirable. Tron FX® is the only stent-retriever that can be deployed through 0.0165-inch microcatheters. Here we report outcomes of blind exchange with mini-pinning (BEMP) technique using Tron stent-retrievers. Methods: Consecutive stroke patients with M2 occlusion treated with 2 x15 mm or 4 x 20 mm Tron stent-retrievers using the BEMP technique were included. The technique involves the deployment of a Tron stent-retriever through a 0.0165-inch microcatheter followed by microcatheter removal and blind navigation of a 3/4MAX aspiration catheter over the bare Tron delivery wire until the aspiration catheter reaches the clot,. Tron stent-retriever was inserted into aspiration catheter like corkscrew, and subsequently pulled as a unit. A first pass effect (FPE), modified FPE (mFPE) and modified Rankin Scale (mRS) score at 90 days were assessed as outcomes. Results: Fifteen M2 vessels were treated in 13 patients (5 women, median 81 years of age, and median National Institutes of Health Stroke Scale score 18 [11–25]). BEMP technique was successful in all cases. Whether to use 3MAX or 4MAX was determined according to the target vessel size while proceeding with the procedure (3MAX, n=8; 4MAX, n=5). Final mTICI 2b–3 was achieved in 92% (12/13). FPE and mFPE rates were 50% and 64%, respectively. Six patients (46%) were achieved in mRS score 0–2 at 3 months. Conclusions: Tron stent-retriever was successfully and safely used in the BEMP technique for M2 occlusion

Neuroradiologic Characteristics of Primary Angiitis of the Central Nervous System According to the Affected Vessel Size

2017 ◽  
Vol 29 (1) ◽  
pp. 37-44 ◽  
Author(s):  
Christian Thaler ◽  
Ann-Katrin Kaufmann-Bühler ◽  
Tserenchunt Gansukh ◽  
Amarjargal Gansukh ◽  
Simon Schuster ◽  
...  
Keyword(s):  
Central Nervous System ◽  
Nervous System ◽  
Vessel Size ◽  
Primary Angiitis ◽  
The Central Nervous System

Vascular smooth muscle cell stress as a determinant of cerebral artery myogenic tone

2002 ◽  
Vol 283 (6) ◽  
pp. H2210-H2216 ◽  
Author(s):  
Johan Fredrik Brekke ◽  
Natalia I. Gokina ◽  
George Osol
Keyword(s):  
Smooth Muscle ◽  
Vascular Smooth Muscle ◽  
Smooth Muscle Cell ◽  
Muscle Cell ◽  
Vascular Smooth Muscle Cell ◽  
Wall Stress ◽  
Cytosolic Calcium ◽  
Cell Stress ◽  
Myogenic Tone ◽  
Vessel Size

Although the level of myogenic tone (MT) varies considerably from vessel to vessel, the regulatory mechanisms through which the actual diameter set point is determined are not known. We hypothesized that a unifying principle may be the equalization of active force at the contractile filament level, which would be reflected in a normalization of wall stress or, more specifically, media stress. Branched segments of rat cerebral arteries ranging from <50 μm to >200 μm in diameter were cannulated and held at 60 mmHg with the objectives of: 1) evaluating the relationship between arterial diameter and the extent of myogenic tone, 2) determining whether differences in MT correlate with changes in cytosolic calcium ([Ca2+]i), and 3) testing the hypothesis that a normalization of wall or media stress occurs during the process of tone development. The level of MT increased significantly as vessel size decreased. At 60 mmHg, vascular smooth muscle [Ca2+]i concentrations were similar in all vessels studied (averaging 230 ± 9.2 nM) and not correlated with vessel size or the extent of tone. Wall tension increased with increasing arterial size, but wall stress and media stress were similar in large versus small arteries. Media stress, in particular, was quite uniform in all vessels studied. Both morphological and calcium data support the concept of equalization of media stress (and, hence, vascular smooth muscle cell stress and force) as an underlying mechanism in determining the level of tone present in any particular vessel. The equalization of active (vascular smooth muscle cell) stress may thus explain differences in MT observed in the different-sized vessels constituting the arterial network and provide a link between arterial structure and function, in both short- and long-term (hypertension) pressure adaptation.

Determination of vessel size: a putative framework to assess clinical outcome

2005 ◽  
Vol 103 (2) ◽  
pp. 135-139 ◽  
Author(s):  
Folkert W. Asselbergs ◽  
Lieuwe H. Piers ◽  
Gillian A.J. Jessurun ◽  
Ad J. van Boven ◽  
Nic J.G.M. Veeger ◽  
...  
Keyword(s):  
Clinical Outcome ◽  
Vessel Size
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