scholarly journals Erosion or Vascular Channel?

2015 ◽  
Vol 67 (11) ◽  
pp. 2956-2956 ◽  
Author(s):  
Stéphanie Boutroy ◽  
Roland Chapurlat ◽  
Arnaud Vanden-Bossche ◽  
Hervé Locrelle ◽  
Thierry Thomas ◽  
...  
Keyword(s):  
Vascular Channel

scholarly journals Angiographic features and transarterial embolization of retained placenta with abnormal vaginal bleeding

2021 ◽  
Vol 4 (1) ◽  
Author(s):  
Ryo Takaji ◽  
Hiro Kiyosue ◽  
Miyuki Maruno ◽  
Norio Hongo ◽  
Ryuichi Shimada ◽  
...  
Keyword(s):  
Vaginal Bleeding ◽  
Transarterial Embolization ◽  
Recurrent Bleeding ◽  
Study Cohort ◽  
Technical Success ◽  
Retained Placenta ◽  
Vascular Channel ◽  
Abnormal Bleeding ◽  
Abnormal Vaginal Bleeding

Abstract Objectives To clarify characteristic angiographic features and clinical efficacy of selective transarterial embolization (TAE) of retained placenta with abnormal vaginal bleeding. Methods The study cohort comprised 22 patients (mean age, 33.5 years; range, 22–24 years) who underwent selective TAE for retained placenta with abnormal bleeding between January 2018 and December 2020 at our institution. Angiographic images were reviewed by two certified radiologists with consensus. Medical records were reviewed to evaluate the efficacy of TAE. Angiographic features of retained placenta, technical success (disappearance of abnormal findings on angiography), complications, clinical outcomes (hemostatic effects and recurrent bleeding) were evaluated. Results Pelvic angiography showed a dilated vascular channel mimicking arteriovenous fistulas or an aneurysm contiguous with dilated uterine arteries in the mid-arterial–capillary phase in 20 patients; it showed contrast brush in the remaining two patients. TAE technical success was achieved in all patients. No major complications were observed in any patients. Fifteen patients were followed up with expectant management after TAE; all but one patient showed no re-bleeding during the follow-up period (mean follow-up interval, 3.4 months; range, 1–17 months). One patient showed minor rebleeding, which resolved spontaneously. Seven patients underwent scheduled hysteroscopic resection within 1 week after TAE, and no excessive bleeding was observed during or after the surgical procedure in all seven patients. Conclusions The characteristic angiographic feature of retained placenta is “dilated vascular channel that mimic low flow AVM.” TAE is a safe and effective treatment to manage retained placenta with abnormal bleeding.

scholarly journals Perfusion Fixation of Research Animals

2006 ◽  
Vol 14 (3) ◽  
pp. 26-33 ◽  
Author(s):  
Charles W. Scouten ◽  
Ryan O'Connor ◽  
Miles Cunningham
Keyword(s):  
Brain Tissue ◽  
Extracellular Space ◽  
Soft Tissues ◽  
Brain Size ◽  
Animal Tissues ◽  
Tissue Samples ◽  
Vascular Channel ◽  
Organ Volume ◽  
Perfusion Fixation

Perfusion, washing out blood and using the open vascular channel to infuse fixative, is the standard first step of preparing animal tissues for later examination under a microscope. The rapid and homogeneous fixation resulting provides an advantage over immersion fixation that is usually used for biopsy and clinical tissue samples (Cammermeyer, 1960, Garman, 1990). A disadvantage is that brain tissue, and probably other soft tissues, prepared by perfusion has no retained extracellular space post perfusion, although living brain has about 20% extracellular space (discussed in Cragg, 1980). Perfused brain is also about 20% shrunk in whole organ volume from living brain size. The shrinkage is uneven, and distorts the relationships of structures. It is possible to avoid the organ shrinkage and distortion that follows a traditional perfusion, with little additional effort. This is a discussion of how to optimize your perfusion results, why the shrinkage occurs, and how it can be avoided.

Vibration Characteristics of Magnetic Nano Fluids-Filled Flexible Cantilevers Under Varied Magnetic Fields

2014 ◽  
Author(s):  
Masoud Masoumi ◽  
Ya Wang
Keyword(s):  
Magnetic Field ◽  
External Magnetic Field ◽  
Damping Ratio ◽  
Equation Of Motion ◽  
Maximum Increase ◽  
Magnetic Nanofluid ◽  
Vascular Channel ◽  
Vibration Responses ◽  
Channel Beam ◽  
Nano Fluids

In this paper, the influence of an external magnetic field on the vibration responses and damping ratios of a vascular beam filled with three different magnetic nanofluids are investigated. First, the equation of motion of a fluid-filled beam is derived based on the published works and some amendments are made to simultaneously include the damping ensuing from the surrounding air and also the effects of viscosity of the fluid inside the vascular channel. Then, the effects of an external magnetic field on the viscosity of the fluid is studied and incorporated into the equation of motion of the beam. Finally, based on three magnetic nanofluid samples, simulations are conducted to represent the changes in frequency response functions and damping ratios of the vascular channel beam. The maximum increase observed in the viscosity of the magnetic nanofluid samples under the influence of magnetic field with the intensity of 1 Tesla was 16%, while the reduction in the vibration amplitude found 12.7% and 33.8% for the first and second vibration mode under the influence of the maximum magnetic field intensity of 0.3 Tesla. Moreover, the maximum decrement of the damping ratio was 1.1% under the same magnetic field. However, it seems that the higher values for vibration reduction can be achieved by using the magnetic nanofluid with higher magnetic particle concentrations and viscosities.

The prognostic significance of vascular channel involvement and deep stromal penetration in early cervical carcinoma

1983 ◽  
Vol 6 (3) ◽  
pp. 259-264 ◽  
Author(s):  
William A. Nahhas ◽  
Francis E. Sharkey ◽  
Charles W. Whitney ◽  
Nader Husseinzadeh ◽  
Chan K. Chung ◽  
...  
Keyword(s):  
Cervical Carcinoma ◽  
Prognostic Significance ◽  
Vascular Channel

scholarly journals Vascular Channel Formation by Human Melanoma Cells in Vivo and in Vitro: Vasculogenic Mimicry

1999 ◽  
Vol 155 (3) ◽  
pp. 739-752 ◽  
Author(s):  
Andrew J. Maniotis ◽  
Robert Folberg ◽  
Angela Hess ◽  
Elisabeth A. Seftor ◽  
Lynn M.G. Gardner ◽  
...  
Keyword(s):  
Vasculogenic Mimicry ◽  
Melanoma Cells ◽  
Human Melanoma ◽  
Channel Formation ◽  
Vascular Channel ◽  
Human Melanoma Cells

Two Cases of Giant Serpentine Aneurysm

Neurosurgery ◽  
1990 ◽  
Vol 26 (6) ◽  
pp. 1027-1033 ◽  
Author(s):  
Toshihiro Kumabe ◽  
Uichi Kaneko ◽  
Takao Ishibashi ◽  
Kou Kaneko ◽  
Shin'ya Uchigasaki
Keyword(s):  
Giant Aneurysm ◽  
Radiological Study ◽  
Vascular Channel ◽  
Serpentine Channel ◽  
Thrombosed Aneurysm ◽  
Serpentine Aneurysm ◽  
Vascular Channels ◽  
Coandǎ Effect ◽  
Organized Thrombus ◽  
Rapid Transformation

Abstract Giant serpentine aneurysm (GSA) is an entity defined on radiological and pathological grounds as a giant, partially thrombosed aneurysm containing tortuous vascular channels. We have had the opportunity to study two patients with GSAs, which has allowed for a complete comparative anatomical and radiological study. This report emphasizes the etiology of the GSAs. Twenty-two patients with GSAs have been reported in the literature, of which pathological studies were done in 10. In most of these, the aneurysm was found to be filled with an organized thrombus, but in our patients the aneurysm was filled with relatively new clot. The aneurysm enlarged and a change in the tortuous vascular channel was observed over a period of 1 year in the first patient, whereas a globoid aneurysm developed into a GSA in the brief period of just 2 weeks in the second patient. This rapid transformation of a globoid aneurysm into a GSA is of particular interest when the etiology of GSAs is considered. Our patients therefore shed some interesting light on the possible pathophysiology of GSAs. That is, the bloodstream may change dynamically in a giant aneurysm and may become a serpentine channel under conditions that lead to a “Coanda effect.”

scholarly journals Vascular channel reserves in patients with systemic atherosclerosis and type 2 diabetes mellitus

2013 ◽  
Vol 16 (1) ◽  
pp. 78-82
Author(s):  
O V Kamenskaya ◽  
I Yu Loginova ◽  
Asya Stanislavovna Klinkova ◽  
Andrey Anatol'evich Karpenko
Keyword(s):  
Diabetes Mellitus ◽  
Type 2 Diabetes ◽  
Type 2 Diabetes Mellitus ◽  
Cerebral Oxygenation ◽  
Lower Efficiency ◽  
Doppler Flowmetry ◽  
Vascular Channel ◽  
Oxygenation Status ◽  
Negative Controls

Aims. To determine vascular channel reserves in patients with systemic atherosclerosis and type 2 diabetes mellitus (T2DM). Materials and Methods. Study included 143 patients with systemic atherosclerosis, 40 of them also suffered from T2DM. We applied laser Doppler flowmetry (LDF) to evaluate vascular channel reserves and transcranial spectrometry to assess cerebral oxygenation status. Results. We found that 60% of patients with systemic atherosclerosis and T2DM show microcirculation parameters below critical level, which indicates failure of collateral circulation. This group also showed lower efficiency of cerebral perfusion and more pronounced vascular constriction in response to functional load as compared to diabetes-negative controls. Conclusion. Patients with T2DM, accompanied with systemic atherosclerosis showed lower circulation efficiency and more pronounced autonomous dysregulation of cerebral circulation against patients without diabetes mellitus.

scholarly journals The vascular channel of the axial flap and the host bed at the earliest period after restricted (not free) transposition

2008 ◽  
Vol 7 (4) ◽  
pp. 52-59
Author(s):  
Ye. V. Semichev ◽  
I. S. Malinovskaya ◽  
D. N. Sinichev
Keyword(s):  
Bond Formation ◽  
Vascular Wall ◽  
Venous Outflow ◽  
Pedicle Flap ◽  
Channel Change ◽  
Vascular Channel ◽  
Formation Dynamics ◽  
Anatomical Finding ◽  
Favorable Conditions ◽  
Abnormal Operation

In order to investigate the vascular channel change of the flap and vascular bond formation dynamics in the zone of flap-recipient (host) bed after transposition we worked out an experimental model with different variants of vascular pedicle flap preparation (intact pedicle flap, periarterial, perivenous and combined sympathectomy). The vascular channel was investigated with the help of clinical evaluation and investigation of anatomical macro-micro specimen. Clinical-anatomical finding demonstrates abnormal operation of microcirculatory flap channel after all kinds of vascular wall denervation. It was found out that in any variants of flap transposition conduction, the flap lifting and crippling of surrounding tissues causes unavoidable loss of additional (collateral) blood supply sources and disorder of lymph venous outflow. Conduction of pedicle flap sympathectomy in different variants causes additional abnormalities during integration of complicated tissue complex. Preservation of adventitious membrane of arterial vessels creates the most favorable conditions for flap integration and adaptation.

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