Computational Study to Assess Whether the Heat Sink Effect of Blood Flow Inside the Portal Vein Could Thermally Protect Its Wall during RF-Assisted Resection

2015 ◽  
pp. 590-593
Author(s):  
Ana González-Suárez ◽  
Macarena Trujillo ◽  
Fernando Burdío ◽  
Anna Andaluz ◽  
Enrique Berjano
Keyword(s):  
Blood Flow ◽  
Portal Vein ◽  
Heat Sink ◽  
Computational Study ◽  
Sink Effect

scholarly journals Could the heat sink effect of blood flow inside large vessels protect the vessel wall from thermal damage during RF-assisted surgical resection?

2014 ◽  
Vol 41 (8Part1) ◽  
pp. 083301 ◽  
Author(s):  
Ana González-Suárez ◽  
Macarena Trujillo ◽  
Fernando Burdío ◽  
Anna Andaluz ◽  
Enrique Berjano
Keyword(s):  
Blood Flow ◽  
Surgical Resection ◽  
Heat Sink ◽  
Vessel Wall ◽  
Thermal Damage ◽  
Sink Effect ◽  
Large Vessels

The Clearance of 133Xenon from the Liver Intraportal Injection in Man

1965 ◽  
Vol 05 (03) ◽  
pp. 241-245 ◽  
Author(s):  
K.-F. Aronsen ◽  
B. Ericsson ◽  
A. Fajgelj ◽  
S.-E. Lindell
Keyword(s):  
Blood Flow ◽  
Portal Vein ◽  
Hepatic Blood Flow ◽  
Scintillation Detectors ◽  
Disappearance Rate ◽  
Simultaneous Measurements

Summary 133Xe dissolved in saline was injected into the portal vein in man. Hepatic blood flow was calculated from the disappearance rate of 133Xe recorded with scintillation detectors placed over the liver. The results are discussed and related to simultaneous measurements of the pressure in the portal vein.

Reduction in portal vein blood flow by somatostatin

Diabetes ◽  
1979 ◽  
Vol 28 (10) ◽  
pp. 888-892 ◽  
Author(s):  
J. Jaspan ◽  
K. Polonsky ◽  
M. Lewis ◽  
A. R. Moossa
Keyword(s):  
Blood Flow ◽  
Portal Vein

scholarly journals Intrauterine growth restriction alters nutrient metabolism in the intestine of porcine offspring

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Tiantian Li ◽  
Shimeng Huang ◽  
Long Lei ◽  
Shiyu Tao ◽  
Yi Xiong ◽  
...  
Keyword(s):  
Blood Flow ◽  
Portal Vein ◽  
Microbial Diversity ◽  
Large Intestine ◽  
Intrauterine Growth Restriction ◽  
Growing Pigs ◽  
Growth Restriction ◽  
Nutrient Metabolism ◽  
Bacterial Fermentation ◽  
Intrauterine Growth

Abstract Background Intrauterine growth restriction (IUGR) has negative impacts on the postnatal survival, growth and development of humans and animals, with not only on newborns but also adulthood. However, the characteristics for nutrient digestion and absorption in IUGR offspring are still largely unknown. Therefore, the normal birth weight (NBW) and IUGR growing pigs were used in this study to investigate their differences in nutrient utilization, with an expectition for further nutritional optimization of the IUGR offspring during their later life. Methods Twelve IUGR and 12 NBW growing pigs were fitted with catheters in their portal vein to measure blood flow rate as well as nutrients and metabolites in plasma. The digestibilities of nutrients in different intestinal segments, and bacterial fermentation in the large intestine were examined to reveal the characteristics of nutrients utilization in IUGR versus NBW pigs. Results The rate of portal venous blood flow did not differ beween IUGR and NBW pigs. Plasma concentrations of total cholesterol, triglycerides and glucose were much lower but those of urea were higher in the portal vein of IUGR pigs, compared with the NBW pigs. The ileal digestibility of dry matter, gross energy and starch were lower in IUGR pigs than in NBW pigs. IUGR increased hindgut microbial diversity and bacterial fermentation activity in the caecum. In vitro cross-fermentation of ileal digesta by caecal microbes of NBW and IUGR pigs showed that gas production was much higher for IUGR ileal digesta regardless of the source of caecal inocula. Conclusion IUGR impairs the nutrient digestion and absorption in small intestine, reduces caecal microbial diversity and promotes bacterial fermentation in the large intestine during the growing phase. These findings aid in our understanding of nutrient metabolism in IUGR pigs and provide the basis for future nutritional interventions.

Thermal Behaviors of Passively-Cooled Hybrid Fin Heat Sinks for Lightweight and High Performance Thermal Management

2015 ◽  
Author(s):  
Nico Setiawan Effendi ◽  
Kyoung Joon Kim
Keyword(s):  
Thermal Resistance ◽  
Heat Sink ◽  
High Performance ◽  
Heat Dissipation ◽  
Computational Study ◽  
Heat Sinks ◽  
Channel Diameter ◽  
Internal Channel ◽  
Study Results ◽  
Parametric Effects

A computational study is conducted to explore thermal performances of natural convection hybrid fin heat sinks (HF HSs). The proposed HF HSs are a hollow hybrid fin heat sink (HHF HS) and a solid hybrid fin heat sink (SHF HS). Parametric effects such as a fin spacing, an internal channel diameter, a heat dissipation on the performance of HF HSs are investigated by CFD analysis. Study results show that the thermal resistance of the HS increases while the mass-multiplied thermal resistance of the HS decreases associated with the increase of the channel diameter. The results also shows the thermal resistance of the SHF HS is 13% smaller, and the mass-multiplied thermal resistance of the HHF HS is 32% smaller compared with the pin fin heat sink (PF HS). These interesting results are mainly due to integrated effects of the mass-reduction, the surface area enhancement, and the heat pumping via the internal channel. Such better performances of HF HSs show the feasibility of alternatives to the conventional PF HS especially for passive cooling of LED lighting modules.

Metabolic responses of the whole body, portal-drained viscera and hindquarter to adrenaline infusion: Effects of nonselective and selective β-adrenoceptor blockade

1997 ◽  
Vol 77 (2) ◽  
pp. 307-316 ◽  
Author(s):  
J. O. O. Miaron ◽  
R. J. Christopherson
Keyword(s):  
Blood Flow ◽  
Oxygen Consumption ◽  
Portal Vein ◽  
Influencing Factor ◽  
External Iliac Artery ◽  
Open Circuit ◽  
Whole Body ◽  
Organ Blood Flow ◽  
Β Blocker ◽  
Β Blockers

Propranolol, a nonselective β-blocker and selective β-blockers (metoprolol a β1-blocker and ICI 118551 a β2-blocker) were used to investigate the β-adrenoceptor-mediated adrenaline-induced increase in whole-body and organ VO2 in five whether sheep. Transit time blood flow probes were chronically implanted on the portal vein and the external iliac artery and sampling catheters were placed in the mesenteric artery, iliac vein and portal vein. Oxygen consumption by the whole body was measured by open circuit calorimetry, and oxygen consumption by the portal-drained viscera and the hindquarter was determined from A-VO2 differences and organ blood flow. Absolute pre-infusion VO2 values for the whole body, portal-drained viscera and hindquarters were 236 ± 7.4, 61 ± 6.0 and 13 ± 3.1 mL min−1 respectively. The mean changes in VO2 in response to infusion were 74 vs. 11, 26, 10 and 12 mL min−1 (SE = 9.1) for whole body; 31 vs. −2, −15, 13 and −4 mL min−1 (SE = 7.3) for portal-drained viscera and 8 vs. −0.4, 2.1, 1.0 and −2.7 mL min−1; SE = 4.3) for hindquarters during adrenaline, control, propranolol, metoprolol and ICI 118551 treatments, respectively. Adrenaline increased VO2 (P < 0.05) in the whole body and portal-drained viscera, but not hindquarters relative to controls. All β-blockers suppressed (P < 0.05) the adrenaline-induced increase in VO2 except for the portal-drained viscera where metoprolol was less effective and the hindquarters where β-blockers had no effect. The blood flow pattern was similar to VO2 responses for the portal-drained viscera. The nonselective β1 and β2 blockers were effective in reducing the adrenaline-induced increases in blood flow from the portal-drained viscera and to the hindquarters, with more pronounced β-adrenoceptor-mediated haemodynamic effects. The results indicate that the β-adrenoceptor system modulates whole body VO2, clearly establishes that adrenaline induces an increased VO2 in portal-drained viscera which can be reversed by a β2 or nonselective β blocker and implicates β adrenoceptors as an influencing factor in the maintenance energy requirements of ruminants. Key words: Calorimetry, adrenaline, β blockers, blood flow, sheep

Computational study of blood flow characteristics on formation of the aneurysm in internal carotid artery

2021 ◽  
Vol 136 (5) ◽  
Author(s):  
Xiao-Yong Shen ◽  
M. Barzegar Gerdroodbary ◽  
Amir Musa Abazari ◽  
Rasoul Moradi
Keyword(s):  
Blood Flow ◽  
Carotid Artery ◽  
Internal Carotid Artery ◽  
Internal Carotid ◽  
Computational Study ◽  
Flow Characteristics

Investigation of the Heat Sink Effect during Microwave Ablation in Hepatic Tissue: Experimental and Numerical Analysis

2021 ◽  
pp. 1-1
Author(s):  
E. De Vita ◽  
F. De Tommasi ◽  
C. Massaroni ◽  
A. Iadicicco ◽  
E. Faiella ◽  
...  
Keyword(s):  
Numerical Analysis ◽  
Heat Sink ◽  
Microwave Ablation ◽  
Hepatic Tissue ◽  
Sink Effect
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