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vein wall thickness

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https://www.readbyqxmd.com/read/28214490/saphenous-vein-wall-thickness-in-age-and-venous-reflux-associated-remodeling-in-adults
#1
Nicos Labropoulos, Kelli Leilani Summers, Ignacio Escotto Sanchez, Joseph Raffetto
OBJECTIVE: This prospective study was designed to determine the great saphenous vein (GSV) wall thickness in age-related and venous reflux-associated remodeling. METHODS: GSV wall thickness was measured in the thigh and calf using a duplex ultrasound 17-MHz transducer. Interobserver and intraobserver variability studies were performed. Two healthy control groups, each with 10 individuals (20 limbs), were selected on the basis of age. Group 1 had a mean age of 21 years, and group 2 had a mean age of 64 years...
March 2017: Journal of Vascular Surgery. Venous and Lymphatic Disorders
https://www.readbyqxmd.com/read/28120557/a-thin-left-atrial-antral-wall-around-the-pulmonary-vein-reflects-structural-remodeling-by-atrial-fibrillation-and-is-associated-with-stroke
#2
Junbeom Park, Chul Hwan Park, Jae Sun Uhm, Hui Nam Pak, Moon Hyoung Lee, Boyoung Joung
PURPOSE: Circumferential pulmonary (PV) vein isolation (CPVI) is the most important treatment strategy for atrial fibrillation (AF). While understanding left atrial wall thickness around PVs (PVWT) prior to catheter ablation is important, its clinical implications are not known. This study aimed to evaluate PVWT characteristics according to underlying disease and to identify associations between PVWT and reconnections of PV potentials (PVPs) in redo ablation. MATERIALS AND METHODS: In 28 patients who underwent redo-AF ablation, PVWT and reconnected PVPs were evaluated at 12 sites (1-12 o'clock) around each PV...
March 2017: Yonsei Medical Journal
https://www.readbyqxmd.com/read/28114851/theoretical-and-experimental-analysis-of-amplitude-control-ablation-and-bipolar-ablation-in-creating-linear-lesion-and-discrete-lesions-for-treating-atrial-fibrillation
#3
Shengjie Yan, Xiaomei Wu, Weiqi Wang
PURPOSE: Radiofrequency (RF) energy is often used to create a linear lesion or discrete lesions for blocking the accessory conduction pathways for treating atrial fibrillation. By using finite element analysis, we study the ablation effect of amplitude control ablation mode (AcM) and bipolar ablation mode (BiM) in creating a linear lesion and discrete lesions in a 5-mm-thick atrial wall; particularly, the characteristic of lesion shape has been investigated in amplitude control ablation...
January 23, 2017: International Journal of Hyperthermia
https://www.readbyqxmd.com/read/28094663/high-pressure-low-flow-remodeling-of-the-rat-saphenous-vein-wall
#4
Judit R Hetthéssy, Anna-Mária Tőkés, Sándor Kérész, Petra Balla, Gabriella Dörnyei, Emil Monos, György L Nádasy
Objective To better understand factors that may play a role in the development of varicosities. Methods We induced combined flow-pressure disturbance in the saphenous system of the rat by performing chronic partial clipping of the main branch. Biomechanical and quantitative histological testing was undertaken. Results A rich microvenous network developed. Bloodflow decreased to 0.65 ± 0.18 µl/s (control side, 3.5 ± 1.4 µl/s) and pressure elevated to 6.8 ± 0.7 mmHg (control side, 2.3 ± 0...
January 1, 2017: Phlebology
https://www.readbyqxmd.com/read/28040761/penetration-of-bronchial-wall-by-knot-of-absorbable-monofilament-suture
#5
Tomoyuki Nakano, Shunsuke Endo, Hideki Negishi, Shinichi Yamamoto
A 75-year-old man underwent thoracoscopic left upper lobectomy for primary lung cancer. Additional ligature plication to the left superior pulmonary vein with absorbable monofilament suture was performed after stapling with an endostapler. Postoperative bronchoscopy revealed penetration of the monofilament thread edge eviscerating across the wall of the left main bronchus. The edge was spontaneously absorbed with no adverse events. Penetration of a thick monofilament thread edge into mediastinal organs should be considered when the thread is located in the mediastinum...
December 31, 2016: Interactive Cardiovascular and Thoracic Surgery
https://www.readbyqxmd.com/read/28012458/impact-of-early-and-late-onset-preeclampsia-on-features-of-placental-and-newborn-vascular-health
#6
Emilie M Herzog, Alex J Eggink, Anniek Reijnierse, Martina A M Kerkhof, Ronald R de Krijger, Anton J M Roks, Irwin K M Reiss, Alex L Nigg, Paul H C Eilers, Eric A P Steegers, Régine P M Steegers-Theunissen
INTRODUCTION: Offspring exposed to preeclampsia (PE) show an increased risk of cardiovascular disease in adulthood. We hypothesize that this is mediated by a disturbed vascular development of the placenta, umbilical cord and fetus. Therefore, we investigated associations between early-onset PE (EOPE), late-onset PE (LOPE) and features of placental and newborn vascular health. METHODS: We performed a nested case-control study in The Rotterdam Periconceptional Cohort, including 30 PE pregnancies (15 EOPE, 15 LOPE) and 218 control pregnancies (164 uncomplicated controls, 54 complicated controls including 28 fetal growth restriction, 26 preterm birth) and assessed macroscopic and histomorphometric outcomes of the placenta and umbilical cord...
January 2017: Placenta
https://www.readbyqxmd.com/read/27752921/full-mimicking-of-coronary-hemodynamics-for-ex-vivo-stimulation-of-human-saphenous-veins
#7
Marco Piola, Matthijs Ruiter, Riccardo Vismara, Valeria Mastrullo, Marco Agrifoglio, Marco Zanobini, Maurizio Pesce, Monica Soncini, Gianfranco Beniamino Fiore
After coronary artery bypass grafting, structural modifications of the saphenous vein wall lead to lumen narrowing in response to the altered hemodynamic conditions. Here we present the design of a novel ex vivo culture system conceived for mimicking central coronary artery hemodynamics, and we report the results of biomechanical stimulation experiments using human saphenous vein samples. The novel pulsatile system used an aortic-like pressure for forcing a time-dependent coronary-like resistance to obtain the corresponding coronary-like flow rate...
October 17, 2016: Annals of Biomedical Engineering
https://www.readbyqxmd.com/read/27639001/alterations-in-macrophage-phenotypes-in-experimental-venous-thrombosis
#8
Katherine A Gallagher, Andrea T Obi, Megan A Elfline, Emily Hogikyan, Catherine E Luke, Samuel Henke, Dawn Coleman, Peter K Henke
OBJECTIVE: Macrophages are involved in venous thrombus (VT) resolution and vein wall remodeling. This study was undertaken to identify variations in macrophage phenotypes in thrombi and vein wall in multiple models of VT to clarify the natural history of macrophage polarization in clearance of VT. We also sought to demonstrate the feasibility of macrophage phenotyping in human VT. METHODS: Established murine models of VT were used to mimic the clinical spectrum of human VT (stasis and nonstasis models)...
October 2016: Journal of Vascular Surgery. Venous and Lymphatic Disorders
https://www.readbyqxmd.com/read/27622956/the-effects-of-iontophoretic-injections-of-salvia-miltiorrhiza-on-the-maturation-of-the-arteriovenous-fistula-a-randomized-controlled-trial
#9
RANDOMIZED CONTROLLED TRIAL
Wang Rongrong, Deng Li, Zhang Guangqing, Chen Xiaoyin, Bao Kun
Context • For patients undergoing hemodialysis, the native arteriovenous fistula (AVF) is the primary approach to vascular access (VA). VA failure is the main cause of morbidity and mortality in hemodialysis patients. It has been reported in recent studies that the primary failure rate can be as high as 50%. Objective • The study investigated the effects of iontophoretic administration of Salvia miltiorrhiza (SM) on the maturation of the AVF. Design • The study was a randomized, controlled trial. Setting • The study occurred in Guangdong Provincial Hospital of Traditional Chinese Medicine (Guangzhou, China)...
September 2016: Alternative Therapies in Health and Medicine
https://www.readbyqxmd.com/read/27540310/retinal-vascular-changes-in-hypertensive-patients-in-ibadan-sub-saharan-africa
#10
Sunday Tunji Oluleye, Bolutife Ayokunu Olusanya, Abiodun Moshood Adeoye
BACKGROUND: Earlier studies in Nigeria reported the rarity of retinal vascular changes in hypertensives. The aim of this study was to describe the various retinal vascular changes in the hypertensive patients of Nigeria. PATIENTS AND METHODS: Nine hundred and three hypertensive patients were studied. This study was approved by the ethical and research committee of the University of Ibadan and University College Hospital, Ibadan, Nigeria. Blood pressure and anthropometric measurements were measured...
2016: International Journal of General Medicine
https://www.readbyqxmd.com/read/27504111/habitat-temperature-and-precipitation-of-arabidopsis-thaliana-ecotypes-determine-the-response-of-foliar-vasculature-photosynthesis-and-transpiration-to-growth-temperature
#11
William W Adams, Jared J Stewart, Christopher M Cohu, Onno Muller, Barbara Demmig-Adams
Acclimatory adjustments of foliar vascular architecture, photosynthetic capacity, and transpiration rate in Arabidopsis thaliana ecotypes (Italian, Polish [Col-0], Swedish) were characterized in the context of habitat of origin. Temperatures of the habitat of origin decreased linearly with increasing habitat latitude, but habitat precipitation was greatest in Italy, lowest in Poland, and intermediate in Sweden. Plants of the three ecotypes raised under three different growth temperature regimes (low, moderate, and high) exhibited highest photosynthetic capacities, greatest leaf thickness, highest chlorophyll a/b ratio and levels of β-carotene, and greatest levels of wall ingrowths in phloem transfer cells, and, in the Col-0 and Swedish ecotypes, of phloem per minor vein in plants grown at the low temperature...
2016: Frontiers in Plant Science
https://www.readbyqxmd.com/read/27452760/-comparative-study-of-ct-versus-gross-pathology-in-rabbit-vx2-colorectal-cancer-model
#12
Guoyang Sun, Fengqi Lu, Zhuiyang Zhang, Danping Wu, Jianming Ni, Xiaoping Wu, Rongrong Zhang, Hongbo Huang
OBJECTIVE: To establish rabbit VX2 colorectal cancer(CRC) model and to compare CT images with gross pathology in order to offer help for TNM staging in patients with CRC. METHODS: VX2 tumor pieces were implanted into colonic wall in 9 New Zealand white rabbits and rectal wall in 2 New Zealand white rabbits. Four weeks after inoculation, Ultravist(370 mg/ml) was injected through ear marginal vein with high pressure injector for stage 3 scanning of chest, abdomen and pelvis, and enhanced CT (collimation 0...
July 2016: Zhonghua Wei Chang Wai Ke za Zhi, Chinese Journal of Gastrointestinal Surgery
https://www.readbyqxmd.com/read/27446279/preoperative-graft-assessment-in-aortocoronary-bypass-surgery
#13
Grigore Tinica, Cristina Luca Vartic, Veronica Mocanu, Dana Baran, Doina Butcovan
Coronary artery bypass graft (CABG) is a surgical procedure able to improve the blood supply to the myocardium. In the present study, the distal segments of grafts taken from the internal thoracic artery (ITA), radial artery (RA) and saphenous vein (SV) for use in aortocoronary bypass surgery were examined. The morphologies of the grafts were investigated in order to draw conclusions concerning their patency and viability. In addition, clinical and laboratory risk factors considered to be significant predictors of lesion severity in graft vessels used in CABGs were investigated...
August 2016: Experimental and Therapeutic Medicine
https://www.readbyqxmd.com/read/27433340/studies-of-human-pancreatic-elastase-treatment-of-rabbit-and-human-vein-rings-to-predict-human-therapeutic-doses
#14
Steven K Burke, David Bunton, Karen Bingham, Emma Moss, Kimberly S Bland, Barry Starcher, Marco D Wong, F Nicholas Franano
Vascular tissue contains abundant elastic fibers that contribute to vessel elasticity. Vonapanitase (formerly PRT-201) is a recombinant human chymotrypsin-like elastase family member 1 (CELA1) shown to cleave the elastin component of elastic fibers, resulting in increased vessel diameter. The purpose of these current studies was to determine vein diameter, wall thickness, elastin content, and vonapanitase potency in veins used in a model of arteriovenous fistula (AVF) and in patients undergoing AVF creation for hemodialysis access to guide dose selection for human trials...
June 2016: Pharmacology Research & Perspectives
https://www.readbyqxmd.com/read/27356645/-g%C3%AE-11-expression-and-effect-of-sildenafil-in-muscularization-of-non-muscular-pulmonary-arterioles-in-rat-with-pulmonary-arterial-hypertension
#15
S A Huang, P Luo, Y C Wu, J G He, C Chen, W Lei
OBJECTIVE: To investigate expression changes and role of Gα11 protein in the processes of muscularization of non-muscular pulmonary arterioles and effect of sildenafil intervention in rats with pulmonary arterial hypertension (PAH). METHODS: Thirty SD rats were randomly divided into three groups, including normal control group, monocrotaline (MCT) group and sildenafil group; PAH model was prepared with 50 mg/kg MCT treatment for 4 weeks in the MCT group, and these rats were treated by 25 mg/kg sildenafil for 2 weeks after PAH formation in the sildenafil group, and the normal control group were treated with the equal amounts of physiological saline instead of monocrotaline; pulmonary artery pressure was measured with jugular vein catheterization; hematoxylin and eosin (HE) staining method was used to detect the pulmonary arteriolar morphology and vascular tissue parameters; expression of the target Gα11 protein, vascular smooth muscle marker osteopontin (OPN) and proliferation marker proliferating cell nuclear antigen (PCNA) was detected by Western blot...
June 14, 2016: Zhonghua Yi Xue za Zhi [Chinese medical journal]
https://www.readbyqxmd.com/read/27247002/ablation-index-a-novel-marker-of-ablation-lesion-quality-prediction-of-pulmonary-vein-reconnection-at-repeat-electrophysiology-study-and-regional-differences-in-target-values
#16
Moloy Das, Jonathan J Loveday, Gareth J Wynn, Sean Gomes, Yawer Saeed, Laura J Bonnett, Johan E P Waktare, Derick M Todd, Mark C S Hall, Richard L Snowdon, Simon Modi, Dhiraj Gupta
AIMS: Force-Time Integral (FTI) is commonly used as a marker of ablation lesion quality during pulmonary vein isolation (PVI), but does not incorporate power. Ablation Index (AI) is a novel lesion quality marker that utilizes contact force, time, and power in a weighted formula. Furthermore, only a single FTI target value has been suggested despite regional variation in left atrial wall thickness. We aimed to study AI's and FTI's relationships with PV reconnection at repeat electrophysiology study, and regional threshold values that predicted no reconnection...
May 31, 2016: Europace: European Pacing, Arrhythmias, and Cardiac Electrophysiology
https://www.readbyqxmd.com/read/27227081/arterio-venous-anastomoses-in-the-human-skin-and-their-role-in-temperature-control
#17
Lars Walløe
Arterio-venous anastomoses (AVAs) are direct connections between small arteries and small veins. In humans they are numerous in the glabrous skin of the hands and feet. The AVAs are short vessel segments with a large inner diameter and a very thick muscular wall. They are densely innervated by adrenergic axons. When they are open, they provide a low-resistance connection between arteries and veins, shunting blood directly into the venous plexuses of the limbs. The AVAs play an important role in temperature regulation in humans in their thermoneutral zone, which for a naked resting human is about 26°C to 36°C, but lower when active and clothed...
January 2016: Temperature: Multidisciplinary Biomedical Journal
https://www.readbyqxmd.com/read/27221713/wall-thickness-of-the-pulmonary-vein-left-atrial-junction-rather-than-electrical-information-as-the-major-determinant-of-dormant-conduction-after-contact-force-guided-pulmonary-vein-isolation
#18
Kazuki Iso, Yasuo Okumura, Ichiro Watanabe, Koichi Nagashima, Kazumasa Sonoda, Rikitake Kogawa, Naoko Sasaki, Keiko Takahashi, Sayaka Kurokawa, Toshiko Nakai, Kimie Ohkubo, Atsushi Hirayama
PURPOSE: The usefulness of electrogram (EGM)-based information has been reported for assessing lesion transmurality during atrial fibrillation (AF) ablation, but the wall thickness of the pulmonary vein-left atrial (PV-LA) junction has not been considered. We conducted a study to evaluate the relation between PV-LA junction wall thickness and the presence of adenosine triphosphate (ATP)-provoked dormant PV conduction. METHODS: Eighteen AF patients underwent extensive encircling pulmonary vein isolation (EEPVI) with a target CF of >10 g...
September 2016: Journal of Interventional Cardiac Electrophysiology: An International Journal of Arrhythmias and Pacing
https://www.readbyqxmd.com/read/27178289/the-structural-and-functional-effects-of-fine-particulate-matter-from-cooking-oil-fumes-on-rat-umbilical-cord-blood-vessels
#19
Xiaoxia Zhu, Lijuan Hou, Jian Zhang, Cijiang Yao, Ying Liu, Chao Zhang, Yachun Xu, Jiyu Cao
A growing body of epidemiological evidence has supported the association between maternal exposure to airborne fine particulate matter (PM2.5) during pregnancy and adverse pregnancy outcomes. However, the specific biological mechanisms implicated in the causes of adverse pregnancy outcomes are not well defined. In this study, a pregnant rat model of exposure to different doses of cooking oil fumes (COFs)-derived PM2.5 by tail intravenous injection in different pregnant stages was established. The results indicated that exposure to COFs-derived PM2...
August 2016: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/27103145/thermal-changes-during-rheolytic-mechanical-thrombectomy
#20
Michael C Hsu, Charles N Weber, Mustafa A Mohammed, Terence P Gade, Stephen Hunt, Gregory J Nadolski, Timothy W I Clark
PURPOSE: To characterize thermal changes induced by rheolytic thrombectomy (RT) within an ex vivo venous model and evaluate resultant changes of endothelial and vessel wall injury. MATERIALS AND METHODS: Patent human saphenous vein segments without thrombus were mounted in an ex vivo perfusion system with a temperature probe apposed to the adventitial surface. RT was performed over a guide wire to facilitate device centering. Continuous RT was performed for 4 minutes with temperature recorded every 10 seconds...
June 2016: Journal of Vascular and Interventional Radiology: JVIR
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