scholarly journals Blood supply of the anal canal in patients with chronic hemorrhoids

2021 ◽  
Vol 11 (4) ◽  
pp. 217-221
Author(s):  
Serhii Sidoruk
Keyword(s):  
Blood Flow ◽  
Anal Canal ◽  
Blood Supply ◽  
Vascular Dysfunction ◽  
Internal Sphincter ◽  
Transrectal Ultrasound ◽  
Arterial Blood Flow ◽  
Arterial Blood ◽  
Vascular Factor ◽  
Two Factors

The most important factors in the development of chronic haemorrhoids today are considered to be the combination of two factors (vascular and mechanical) that lead to the development of hemorrhoids. The underlying vascular factor is the vascular dysfunction, providing arterial blood flow through the arteries to the cavernous bodies and outflow through the cavernous veins, which leads to dilation of cavernous bodies and the formation of vascular malformations.There were performed clinical examination and treatment of 140 patients with chronic hemorrhoids of stage III-IV according to Goligher. The features of arterial blood supply of the anal canal were evaluated by transrectal ultrasound examination.It was found that there was no clear linear relationship between the number of anal arteries with increased blood flow and the number of hemorrhoidal nodes in the patient. Each node was supplied with blood from one or two arteries: the node placed at 11 o'clock had blood supply from the arteries visualized at 10 and 11 o'clock, the node at 3 o'clock - arteries at 3 and 5 o'clock, the node at 7 o'clock - arteries at 7 and 9 o'clock. The arteries were most frequently visualized at the first (89.4%), the third (93.3%), the seventh (88.8%) and the eleventh (93.4%) hours. With less frequency the hemodynamically significant arteries were visualized at the fifth (65.0%), the ninth (62.8%) and the tenth (66.7%) hours. The arteries that were suppliing blood hemorrhoidal vessels were located in the internal sphincter at a depth of 5 to 10 mm. In the area of 3, 7 and 11 hours, they overlapped with a mosaic pattern that corresponded to the localization of the cavernous body and resembled an arteriovenous fistula according to the СDS.

Common Origin of the Arterial Blood Flow for an Arteriovenous Medullar Fistula and the Anterior Spinal Artery: A Case Report

Neurosurgery ◽  
1986 ◽  
Vol 18 (5) ◽  
pp. 660-663 ◽  
Author(s):  
Erick Clavier ◽  
Marc Tadie ◽  
Jacques Thiebot ◽  
Olivier Presles ◽  
Michel Benozio
Keyword(s):  
Spinal Cord ◽  
Blood Flow ◽  
Case Report ◽  
Blood Supply ◽  
Supply System ◽  
Common Origin ◽  
Arterial Blood Flow ◽  
Dural Arteriovenous Malformation ◽  
Segmental Artery ◽  
Arterial Blood

Abstract A common origin of the blood supply to a dural arteriovenous malformation and to the spinal cord from the same segmental artery is very rare. This obviously contraindicates embolization of the fistula. Demonstrating the location of the normal spinal blood supply system is therefore mandatory to avoid postoperative complications. The visualization of the normal blood vessels can be masked by a steal phenomenon, but it must at all costs be obtained. The authors describe one such case.

scholarly journals Exercise training improves vascular function in patients with Alzheimer’s disease

2020 ◽  
Vol 120 (10) ◽  
pp. 2233-2245
Author(s):  
Anna Pedrinolla ◽  
Massimo Venturelli ◽  
Cristina Fonte ◽  
Stefano Tamburin ◽  
Angela Di Baldassarre ◽  
...  
Keyword(s):  
Alzheimer’S Disease ◽  
Alzheimer's Disease ◽  
Blood Flow ◽  
Exercise Training ◽  
Vascular Function ◽  
Vascular Dysfunction ◽  
Area Under The Curve ◽  
Arterial Blood Flow ◽  
Control Group ◽  
Arterial Blood

Abstract Purpose Vascular dysfunction has been demonstrated in patients with Alzheimer’s disease (AD). Exercise is known to positively affect vascular function. Thus, the aim of our study was to investigate exercise-induced effects on vascular function in AD. Methods Thirty-nine patients with AD (79 ± 8 years) were recruited and randomly assigned to exercise training (EX, n = 20) or control group (CTRL, n = 19). All subjects performed 72 treatment sessions (90 min, 3 t/w). EX included moderate–high-intensity aerobic and strength training. CTRL included cognitive stimuli (visual, verbal, auditive). Before and after the 6-month treatment, the vascular function was measured by passive-leg movement test (PLM, calculating the variation in blood flow: ∆peak; and area under the curve: AUC) tests, and flow-mediated dilation (FMD, %). A blood sample was analyzed for vascular endothelial growth factor (VEGF). Arterial blood flow (BF) and shear rate (SR) were measured during EX and CTRL during a typical treatment session. Results EX group has increased FMD% (+ 3.725%, p < 0.001), PLM ∆peak (+ 99.056 ml/min, p = 0.004), AUC (+ 37.359AU, p = 0.037) and VEGF (+ 8.825 pg/ml, p = 0.004). In the CTRL group, no difference between pre- and post-treatment was found for any variable. Increase in BF and SR was demonstrated during EX (BF + 123%, p < 0.05; SR + 134%, p < 0.05), but not during CTRL treatment. Conclusion Exercise training improves peripheral vascular function in AD. These ameliorations may be due to the repetitive increase in SR during exercise which triggers NO and VEGF upregulation. This approach might be included in standard AD clinical practice as an effective strategy to treat vascular dysfunction in this population.

Modeling Elastic Walls in Lattice Boltzmann Simulations of Arterial Blood Flow

2013 ◽  
Vol 23 (2) ◽  
Author(s):  
Xenia Descovich ◽  
Giuseppe Pontrelli ◽  
Sauro Succi ◽  
Simone Melchionna ◽  
Manfred Bammer
Keyword(s):  
Blood Flow ◽  
Lattice Boltzmann ◽  
Arterial Blood Flow ◽  
Arterial Blood ◽  
Lattice Boltzmann Simulations ◽  
Elastic Walls

scholarly journals Sustained Inflation Reduces Pulmonary Blood Flow during Resuscitation with an Intact Cord

Children ◽  
2021 ◽  
Vol 8 (5) ◽  
pp. 353
Author(s):  
Jayasree Nair ◽  
Lauren Davidson ◽  
Sylvia Gugino ◽  
Carmon Koenigsknecht ◽  
Justin Helman ◽  
...  
Keyword(s):  
Blood Flow ◽  
Perinatal Asphyxia ◽  
Arterial Blood Flow ◽  
Positive Pressure ◽  
Optimal Timing ◽  
Delayed Cord Clamping ◽  
Arterial Blood ◽  
Cord Clamping ◽  
Sustained Inflation ◽  
Near Term

The optimal timing of cord clamping in asphyxia is not known. Our aims were to determine the effect of ventilation (sustained inflation–SI vs. positive pressure ventilation–V) with early (ECC) or delayed cord clamping (DCC) in asphyxiated near-term lambs. We hypothesized that SI with DCC improves gas exchange and hemodynamics in near-term lambs with asphyxial bradycardia. A total of 28 lambs were asphyxiated to a mean blood pressure of 22 mmHg. Lambs were randomized based on the timing of cord clamping (ECC—immediate, DCC—60 s) and mode of initial ventilation into five groups: ECC + V, ECC + SI, DCC, DCC + V and DCC + SI. The magnitude of placental transfusion was assessed using biotinylated RBC. Though an asphyxial bradycardia model, 2–3 lambs in each group were arrested. There was no difference in primary outcomes, the time to reach baseline carotid blood flow (CBF), HR ≥ 100 bpm or MBP ≥ 40 mmHg. SI reduced pulmonary (PBF) and umbilical venous (UV) blood flow without affecting CBF or umbilical arterial blood flow. A significant reduction in PBF with SI persisted for a few minutes after birth. In our model of perinatal asphyxia, an initial SI breath increased airway pressure, and reduced PBF and UV return with an intact cord. Further clinical studies evaluating the timing of cord clamping and ventilation strategy in asphyxiated infants are warranted.

Incidence and risk factors of early arterial blood flow stasis during first radioembolization of primary and secondary liver malignancy using resin microspheres: an initial single-center analysis

2015 ◽  
Vol 26 (8) ◽  
pp. 2779-2789 ◽  
Author(s):  
Claus Christian Pieper ◽  
Winfried A. Willinek ◽  
Daniel Thomas ◽  
Hojjat Ahmadzadehfar ◽  
Markus Essler ◽  
...  
Keyword(s):  
Risk Factors ◽  
Blood Flow ◽  
Arterial Blood Flow ◽  
Single Center ◽  
Liver Malignancy ◽  
Arterial Blood ◽  
Resin Microspheres ◽  
Flow Stasis

scholarly journals Renal arterial blood flow measurement by breath-held MRI: Accuracy in phantom scans and reproducibility in healthy subjects

2010 ◽  
Vol 63 (4) ◽  
pp. 940-950 ◽  
Author(s):  
Samuel Dambreville ◽  
Arlene B. Chapman ◽  
Vicente E. Torres ◽  
Bernard F. King ◽  
Ashley K. Wallin ◽  
...  
Keyword(s):  
Blood Flow ◽  
Healthy Subjects ◽  
Flow Measurement ◽  
Arterial Blood Flow ◽  
Blood Flow Measurement ◽  
Arterial Blood
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