Conductance method for the measurement of cross-sectional areas of the aorta
A modified conductance method to determine the cross-sectional areas (CSAs) of arteries in piglets was evaluated in vivo. The method utilized a conductance catheter having four electrodes. Between the outer electrodes an alternating current was applied and between the inner electrodes the induced vo...
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| Veröffentlicht in: | Annals of biomedical engineering 1999-03, Vol.27 (2), p.141-150 |
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| creator | KORNET, L JANSEN, J. R. C GUSSENHOVEN, E. J HARDEMAN, M. R HOEKS, A. P. G VERSPRILLE, A |
| description | A modified conductance method to determine the cross-sectional areas (CSAs) of arteries in piglets was evaluated in vivo. The method utilized a conductance catheter having four electrodes. Between the outer electrodes an alternating current was applied and between the inner electrodes the induced voltage difference was measured and converted into a conductance. CSA was determined from measured conductance minus parallel conductance, which is the conductance of the tissues surrounding the vessel times the length between the measuring electrodes of the conductance catheter divided by the conductivity of blood. The parallel conductance was determined by injecting hypertonic saline to change blood conductivity. The conductivity of blood was calculated from temperature and hematocrit and corrected for maximal deformation and changes in orientation of the erythrocytes under shear stress conditions. The equations to calculate the conductivity of blood were obtained from in vitro experiments. In vivo average aortic CSAs. determined with the conductance method CSA(G) in five piglets, were compared to those determined with the intravascular ultrasound method CSA(IVUS). The regression equation between both values was CSA(G)=-0.09+1.00 x CSA(IVUS), r=0.97, n=53. The mean difference between the values was -0.29%+/-5.57% (2 standard deviations). We conclude that the modified conductance method is a reliable technique to estimate the average cross-sectional areas of the aorta in piglets. |
| doi_str_mv | 10.1114/1.219 |
| format | Article |
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R. C ; GUSSENHOVEN, E. J ; HARDEMAN, M. R ; HOEKS, A. P. G ; VERSPRILLE, A</creator><creatorcontrib>KORNET, L ; JANSEN, J. R. C ; GUSSENHOVEN, E. J ; HARDEMAN, M. R ; HOEKS, A. P. G ; VERSPRILLE, A</creatorcontrib><description>A modified conductance method to determine the cross-sectional areas (CSAs) of arteries in piglets was evaluated in vivo. The method utilized a conductance catheter having four electrodes. Between the outer electrodes an alternating current was applied and between the inner electrodes the induced voltage difference was measured and converted into a conductance. CSA was determined from measured conductance minus parallel conductance, which is the conductance of the tissues surrounding the vessel times the length between the measuring electrodes of the conductance catheter divided by the conductivity of blood. The parallel conductance was determined by injecting hypertonic saline to change blood conductivity. The conductivity of blood was calculated from temperature and hematocrit and corrected for maximal deformation and changes in orientation of the erythrocytes under shear stress conditions. The equations to calculate the conductivity of blood were obtained from in vitro experiments. In vivo average aortic CSAs. determined with the conductance method CSA(G) in five piglets, were compared to those determined with the intravascular ultrasound method CSA(IVUS). The regression equation between both values was CSA(G)=-0.09+1.00 x CSA(IVUS), r=0.97, n=53. The mean difference between the values was -0.29%+/-5.57% (2 standard deviations). We conclude that the modified conductance method is a reliable technique to estimate the average cross-sectional areas of the aorta in piglets.</description><identifier>ISSN: 0090-6964</identifier><identifier>EISSN: 1573-9686</identifier><identifier>DOI: 10.1114/1.219</identifier><identifier>PMID: 10199690</identifier><identifier>CODEN: ABMECF</identifier><language>eng</language><publisher>New York, NY: Springer</publisher><subject>Animals ; Aorta ; Aorta, Thoracic - diagnostic imaging ; Aorta, Thoracic - physiology ; Arteries - anatomy & histology ; Arteries - diagnostic imaging ; Arteries - physiology ; Biological and medical sciences ; Biomedical engineering ; Biomedical materials ; Blood ; Blood vessels and receptors ; Compliance ; Conductance ; Conductivity ; Cross sections ; Diastole - physiology ; Electric Conductivity ; Electrocardiography ; Electrodes ; Erythrocyte Aggregation - physiology ; Erythrocyte Deformability - physiology ; Fundamental and applied biological sciences. Psychology ; Linear Models ; Mathematical analysis ; Medical instruments ; Models, Cardiovascular ; Pulsatile Flow - physiology ; Shear stress ; Stress, Mechanical ; Surgical implants ; Swine ; Systole - physiology ; Ultrasonography ; Vertebrates: cardiovascular system</subject><ispartof>Annals of biomedical engineering, 1999-03, Vol.27 (2), p.141-150</ispartof><rights>1999 INIST-CNRS</rights><rights>Biomedical Engineering Society 1999</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c309t-66fa95f679232f45a926c13c9ddd72e1f5952fbdfebf50926670059b3fd3308e3</citedby></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>314,780,784,27924,27925</link.rule.ids><backlink>$$Uhttp://pascal-francis.inist.fr/vibad/index.php?action=getRecordDetail&idt=1727115$$DView record in Pascal Francis$$Hfree_for_read</backlink><backlink>$$Uhttps://www.ncbi.nlm.nih.gov/pubmed/10199690$$D View this record in MEDLINE/PubMed$$Hfree_for_read</backlink></links><search><creatorcontrib>KORNET, L</creatorcontrib><creatorcontrib>JANSEN, J. R. C</creatorcontrib><creatorcontrib>GUSSENHOVEN, E. J</creatorcontrib><creatorcontrib>HARDEMAN, M. R</creatorcontrib><creatorcontrib>HOEKS, A. P. G</creatorcontrib><creatorcontrib>VERSPRILLE, A</creatorcontrib><title>Conductance method for the measurement of cross-sectional areas of the aorta</title><title>Annals of biomedical engineering</title><addtitle>Ann Biomed Eng</addtitle><description>A modified conductance method to determine the cross-sectional areas (CSAs) of arteries in piglets was evaluated in vivo. The method utilized a conductance catheter having four electrodes. Between the outer electrodes an alternating current was applied and between the inner electrodes the induced voltage difference was measured and converted into a conductance. CSA was determined from measured conductance minus parallel conductance, which is the conductance of the tissues surrounding the vessel times the length between the measuring electrodes of the conductance catheter divided by the conductivity of blood. The parallel conductance was determined by injecting hypertonic saline to change blood conductivity. The conductivity of blood was calculated from temperature and hematocrit and corrected for maximal deformation and changes in orientation of the erythrocytes under shear stress conditions. The equations to calculate the conductivity of blood were obtained from in vitro experiments. In vivo average aortic CSAs. determined with the conductance method CSA(G) in five piglets, were compared to those determined with the intravascular ultrasound method CSA(IVUS). The regression equation between both values was CSA(G)=-0.09+1.00 x CSA(IVUS), r=0.97, n=53. The mean difference between the values was -0.29%+/-5.57% (2 standard deviations). We conclude that the modified conductance method is a reliable technique to estimate the average cross-sectional areas of the aorta in piglets.</description><subject>Animals</subject><subject>Aorta</subject><subject>Aorta, Thoracic - diagnostic imaging</subject><subject>Aorta, Thoracic - physiology</subject><subject>Arteries - anatomy & histology</subject><subject>Arteries - diagnostic imaging</subject><subject>Arteries - physiology</subject><subject>Biological and medical sciences</subject><subject>Biomedical engineering</subject><subject>Biomedical materials</subject><subject>Blood</subject><subject>Blood vessels and receptors</subject><subject>Compliance</subject><subject>Conductance</subject><subject>Conductivity</subject><subject>Cross sections</subject><subject>Diastole - physiology</subject><subject>Electric Conductivity</subject><subject>Electrocardiography</subject><subject>Electrodes</subject><subject>Erythrocyte Aggregation - physiology</subject><subject>Erythrocyte Deformability - physiology</subject><subject>Fundamental and applied biological sciences. Psychology</subject><subject>Linear Models</subject><subject>Mathematical analysis</subject><subject>Medical instruments</subject><subject>Models, Cardiovascular</subject><subject>Pulsatile Flow - physiology</subject><subject>Shear stress</subject><subject>Stress, Mechanical</subject><subject>Surgical implants</subject><subject>Swine</subject><subject>Systole - physiology</subject><subject>Ultrasonography</subject><subject>Vertebrates: cardiovascular system</subject><issn>0090-6964</issn><issn>1573-9686</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>1999</creationdate><recordtype>article</recordtype><sourceid>EIF</sourceid><sourceid>ABUWG</sourceid><sourceid>AFKRA</sourceid><sourceid>AZQEC</sourceid><sourceid>BENPR</sourceid><sourceid>CCPQU</sourceid><sourceid>DWQXO</sourceid><sourceid>GNUQQ</sourceid><recordid>eNp90V1LwzAUBuAgiptzf0GK-HXTmZM0SXMpwy8YeKPXJU0T1tE2M2kv_PembqB4satwOA8H8r4IzQEvACC7hwUBeYSmwARNJc_5MZpiLHHKJc8m6CyEDcYAOWWnaAIYpOQST9Fq6bpq0L3qtEla069dlVjnk349jioM3rSm6xNnE-1dCGkwuq9dp5pE-bgfF6NVzvfqHJ1Y1QQz378z9PH0-L58SVdvz6_Lh1WqKZZ9yrlVklkuJKHEZkxJwjVQLauqEsSAZZIRW1bWlJbhuOQCYyZLaitKcW7oDN3u7m69-xxM6Iu2Dto0jeqMG0KRUwBB4yejvDkoYzgiB8YivDsIgQsgkklKIr38Rzdu8DGRUAjGBSeQiYiud-gnNW9ssfV1q_xXAbgYCyugiIVFd7E_NpStqf6oXUMRXO2BClo11sem6vDrBBEAjH4DAeCZ1A</recordid><startdate>199903</startdate><enddate>199903</enddate><creator>KORNET, L</creator><creator>JANSEN, J. 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Psychology</topic><topic>Linear Models</topic><topic>Mathematical analysis</topic><topic>Medical instruments</topic><topic>Models, Cardiovascular</topic><topic>Pulsatile Flow - physiology</topic><topic>Shear stress</topic><topic>Stress, Mechanical</topic><topic>Surgical implants</topic><topic>Swine</topic><topic>Systole - physiology</topic><topic>Ultrasonography</topic><topic>Vertebrates: cardiovascular system</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>KORNET, L</creatorcontrib><creatorcontrib>JANSEN, J. R. C</creatorcontrib><creatorcontrib>GUSSENHOVEN, E. J</creatorcontrib><creatorcontrib>HARDEMAN, M. R</creatorcontrib><creatorcontrib>HOEKS, A. P. 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R. C</au><au>GUSSENHOVEN, E. J</au><au>HARDEMAN, M. R</au><au>HOEKS, A. P. G</au><au>VERSPRILLE, A</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Conductance method for the measurement of cross-sectional areas of the aorta</atitle><jtitle>Annals of biomedical engineering</jtitle><addtitle>Ann Biomed Eng</addtitle><date>1999-03</date><risdate>1999</risdate><volume>27</volume><issue>2</issue><spage>141</spage><epage>150</epage><pages>141-150</pages><issn>0090-6964</issn><eissn>1573-9686</eissn><coden>ABMECF</coden><abstract>A modified conductance method to determine the cross-sectional areas (CSAs) of arteries in piglets was evaluated in vivo. The method utilized a conductance catheter having four electrodes. Between the outer electrodes an alternating current was applied and between the inner electrodes the induced voltage difference was measured and converted into a conductance. CSA was determined from measured conductance minus parallel conductance, which is the conductance of the tissues surrounding the vessel times the length between the measuring electrodes of the conductance catheter divided by the conductivity of blood. The parallel conductance was determined by injecting hypertonic saline to change blood conductivity. The conductivity of blood was calculated from temperature and hematocrit and corrected for maximal deformation and changes in orientation of the erythrocytes under shear stress conditions. The equations to calculate the conductivity of blood were obtained from in vitro experiments. In vivo average aortic CSAs. determined with the conductance method CSA(G) in five piglets, were compared to those determined with the intravascular ultrasound method CSA(IVUS). The regression equation between both values was CSA(G)=-0.09+1.00 x CSA(IVUS), r=0.97, n=53. The mean difference between the values was -0.29%+/-5.57% (2 standard deviations). We conclude that the modified conductance method is a reliable technique to estimate the average cross-sectional areas of the aorta in piglets.</abstract><cop>New York, NY</cop><pub>Springer</pub><pmid>10199690</pmid><doi>10.1114/1.219</doi><tpages>10</tpages></addata></record> |
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| subjects | Animals Aorta Aorta, Thoracic - diagnostic imaging Aorta, Thoracic - physiology Arteries - anatomy & histology Arteries - diagnostic imaging Arteries - physiology Biological and medical sciences Biomedical engineering Biomedical materials Blood Blood vessels and receptors Compliance Conductance Conductivity Cross sections Diastole - physiology Electric Conductivity Electrocardiography Electrodes Erythrocyte Aggregation - physiology Erythrocyte Deformability - physiology Fundamental and applied biological sciences. Psychology Linear Models Mathematical analysis Medical instruments Models, Cardiovascular Pulsatile Flow - physiology Shear stress Stress, Mechanical Surgical implants Swine Systole - physiology Ultrasonography Vertebrates: cardiovascular system |
| title | Conductance method for the measurement of cross-sectional areas of the aorta |
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