A longitudinal study of umbilical artery Doppler waveforms in normal pregnancy: analysis using Laplace transform techniques
Objective To analyse umbilical artery Doppler waveforms using the Laplace transform analysis technique, an alternative method of waveform shape analysis, and to determine the normal ranges for the variables of this technique throughout normal pregnancy. Design A prospective longitudinal study. Setti...
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| Veröffentlicht in: | BJOG : an international journal of obstetrics and gynaecology 1998-01, Vol.105 (1), p.78-82 |
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| creator | Brackley, Karen J. Ramsay, Margaret M. Pipkin, Fiona Broughton Rubin, Peter C. |
| description | Objective
To analyse umbilical artery Doppler waveforms using the Laplace transform analysis technique, an alternative method of waveform shape analysis, and to determine the normal ranges for the variables of this technique throughout normal pregnancy.
Design
A prospective longitudinal study.
Setting
Department of Obstetrics and Gynaecology, Nottingham University Hospital.
Sample
A cohort of 17 healthy women investigated every four weeks from the end of the first trimester until term.
Methods
Umbilical artery Doppler signals were recorded and analysed using the Laplace transform analysis technique. The median and interquartile ranges for each variable were determined and serial changes during pregnancy described.
Results
Vessel wall tone decreases in the umbilical artery at the beginning of the second trimester. Alpha, the variable related to upstream flow conditions, also decreases at this stage of pregnancy but values are then comparatively stable from 24 weeks of gestation until term. A fall in downstream resistance within the fetoplacental circulation during pregnancy is detected using the C‐coefficient. Real pole appears to be of no value in the assessment of downstream resistance to flow in the fetus.
Conclusions
The normal ranges for the Laplace transform analysis variables have been established for the umbilical artery longitudinally through normal pregnancy. Changes in fetal blood flow during complicated pregnancy can now be investigated using this technique. |
| doi_str_mv | 10.1111/j.1471-0528.1998.tb09354.x |
| format | Article |
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To analyse umbilical artery Doppler waveforms using the Laplace transform analysis technique, an alternative method of waveform shape analysis, and to determine the normal ranges for the variables of this technique throughout normal pregnancy.
Design
A prospective longitudinal study.
Setting
Department of Obstetrics and Gynaecology, Nottingham University Hospital.
Sample
A cohort of 17 healthy women investigated every four weeks from the end of the first trimester until term.
Methods
Umbilical artery Doppler signals were recorded and analysed using the Laplace transform analysis technique. The median and interquartile ranges for each variable were determined and serial changes during pregnancy described.
Results
Vessel wall tone decreases in the umbilical artery at the beginning of the second trimester. Alpha, the variable related to upstream flow conditions, also decreases at this stage of pregnancy but values are then comparatively stable from 24 weeks of gestation until term. A fall in downstream resistance within the fetoplacental circulation during pregnancy is detected using the C‐coefficient. Real pole appears to be of no value in the assessment of downstream resistance to flow in the fetus.
Conclusions
The normal ranges for the Laplace transform analysis variables have been established for the umbilical artery longitudinally through normal pregnancy. Changes in fetal blood flow during complicated pregnancy can now be investigated using this technique.</description><identifier>ISSN: 1470-0328</identifier><identifier>ISSN: 0306-5456</identifier><identifier>EISSN: 1471-0528</identifier><identifier>EISSN: 1365-215X</identifier><identifier>DOI: 10.1111/j.1471-0528.1998.tb09354.x</identifier><identifier>PMID: 9442166</identifier><identifier>CODEN: BJOGAS</identifier><language>eng</language><publisher>Oxford, UK: Blackwell Publishing Ltd</publisher><subject>Adult ; Biological and medical sciences ; Female ; Gynecology. Andrology. Obstetrics ; Humans ; Longitudinal Studies ; Management. Prenatal diagnosis ; Medical sciences ; Pregnancy - physiology ; Pregnancy. Fetus. Placenta ; Prospective Studies ; Reference Values ; Ultrasonography, Doppler, Color ; Ultrasonography, Prenatal - methods ; Umbilical Arteries - physiology</subject><ispartof>BJOG : an international journal of obstetrics and gynaecology, 1998-01, Vol.105 (1), p.78-82</ispartof><rights>1998 INIST-CNRS</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c3978-6985de4718627f4bd5bc5c5ca18848b2e0e85720200d41a10671ff442c02fb303</citedby><cites>FETCH-LOGICAL-c3978-6985de4718627f4bd5bc5c5ca18848b2e0e85720200d41a10671ff442c02fb303</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktopdf>$$Uhttps://onlinelibrary.wiley.com/doi/pdf/10.1111%2Fj.1471-0528.1998.tb09354.x$$EPDF$$P50$$Gwiley$$H</linktopdf><linktohtml>$$Uhttps://onlinelibrary.wiley.com/doi/full/10.1111%2Fj.1471-0528.1998.tb09354.x$$EHTML$$P50$$Gwiley$$H</linktohtml><link.rule.ids>314,780,784,1417,4024,27923,27924,27925,45574,45575</link.rule.ids><backlink>$$Uhttp://pascal-francis.inist.fr/vibad/index.php?action=getRecordDetail&idt=2111979$$DView record in Pascal Francis$$Hfree_for_read</backlink><backlink>$$Uhttps://www.ncbi.nlm.nih.gov/pubmed/9442166$$D View this record in MEDLINE/PubMed$$Hfree_for_read</backlink></links><search><creatorcontrib>Brackley, Karen J.</creatorcontrib><creatorcontrib>Ramsay, Margaret M.</creatorcontrib><creatorcontrib>Pipkin, Fiona Broughton</creatorcontrib><creatorcontrib>Rubin, Peter C.</creatorcontrib><title>A longitudinal study of umbilical artery Doppler waveforms in normal pregnancy: analysis using Laplace transform techniques</title><title>BJOG : an international journal of obstetrics and gynaecology</title><addtitle>Br J Obstet Gynaecol</addtitle><description>Objective
To analyse umbilical artery Doppler waveforms using the Laplace transform analysis technique, an alternative method of waveform shape analysis, and to determine the normal ranges for the variables of this technique throughout normal pregnancy.
Design
A prospective longitudinal study.
Setting
Department of Obstetrics and Gynaecology, Nottingham University Hospital.
Sample
A cohort of 17 healthy women investigated every four weeks from the end of the first trimester until term.
Methods
Umbilical artery Doppler signals were recorded and analysed using the Laplace transform analysis technique. The median and interquartile ranges for each variable were determined and serial changes during pregnancy described.
Results
Vessel wall tone decreases in the umbilical artery at the beginning of the second trimester. Alpha, the variable related to upstream flow conditions, also decreases at this stage of pregnancy but values are then comparatively stable from 24 weeks of gestation until term. A fall in downstream resistance within the fetoplacental circulation during pregnancy is detected using the C‐coefficient. Real pole appears to be of no value in the assessment of downstream resistance to flow in the fetus.
Conclusions
The normal ranges for the Laplace transform analysis variables have been established for the umbilical artery longitudinally through normal pregnancy. Changes in fetal blood flow during complicated pregnancy can now be investigated using this technique.</description><subject>Adult</subject><subject>Biological and medical sciences</subject><subject>Female</subject><subject>Gynecology. Andrology. Obstetrics</subject><subject>Humans</subject><subject>Longitudinal Studies</subject><subject>Management. Prenatal diagnosis</subject><subject>Medical sciences</subject><subject>Pregnancy - physiology</subject><subject>Pregnancy. Fetus. Placenta</subject><subject>Prospective Studies</subject><subject>Reference Values</subject><subject>Ultrasonography, Doppler, Color</subject><subject>Ultrasonography, Prenatal - methods</subject><subject>Umbilical Arteries - physiology</subject><issn>1470-0328</issn><issn>0306-5456</issn><issn>1471-0528</issn><issn>1365-215X</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>1998</creationdate><recordtype>article</recordtype><sourceid>EIF</sourceid><recordid>eNqVkMtu1DAUhi0EKqXwCEgWQuwSbCfxpRKLUi4tGqkbWFuOYw8eOU6wE9qIl6_DRLOvvfCRz_-fywfAO4xKnM_HQ4lrhgvUEF5iIXg5tUhUTV0-PAPnp9Tz_zEqUEX4S_AqpQNCmBJUnYEzUdcEU3oO_l1BP4S9m-bOBeVhysECBwvnvnXe6fyl4mTiAr8M4-hNhPfqr7FD7BN0AYYcZMkYzT6ooJdLqHKVJbkE5-TCHu7U6JU2cIoqpNUGJ6N_B_dnNuk1eGGVT-bN9l6AX9--_ry-KXZ332-vr3aFrgTjBRW86UzeilPCbN12TaubfBXmvOYtMcjwhhFEEOpqrDCiDFubF9SI2LZC1QX4cKw7xmHtO8neJW28V8EMc5JMUEpZLbLw8ijUcUgpGivH6HoVF4mRXMnLg1zxyhWvXMnLjbx8yOa3W5e57U13sm6oc_79llcpY7UZiHbpJCO5vGDrDJ-OsnvnzfKEAeTnH3eMV48djqIB</recordid><startdate>199801</startdate><enddate>199801</enddate><creator>Brackley, Karen J.</creator><creator>Ramsay, Margaret M.</creator><creator>Pipkin, Fiona Broughton</creator><creator>Rubin, Peter C.</creator><general>Blackwell Publishing Ltd</general><general>Blackwell</general><scope>IQODW</scope><scope>CGR</scope><scope>CUY</scope><scope>CVF</scope><scope>ECM</scope><scope>EIF</scope><scope>NPM</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>7X8</scope></search><sort><creationdate>199801</creationdate><title>A longitudinal study of umbilical artery Doppler waveforms in normal pregnancy: analysis using Laplace transform techniques</title><author>Brackley, Karen J. ; Ramsay, Margaret M. ; Pipkin, Fiona Broughton ; Rubin, Peter C.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c3978-6985de4718627f4bd5bc5c5ca18848b2e0e85720200d41a10671ff442c02fb303</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>1998</creationdate><topic>Adult</topic><topic>Biological and medical sciences</topic><topic>Female</topic><topic>Gynecology. Andrology. Obstetrics</topic><topic>Humans</topic><topic>Longitudinal Studies</topic><topic>Management. Prenatal diagnosis</topic><topic>Medical sciences</topic><topic>Pregnancy - physiology</topic><topic>Pregnancy. Fetus. Placenta</topic><topic>Prospective Studies</topic><topic>Reference Values</topic><topic>Ultrasonography, Doppler, Color</topic><topic>Ultrasonography, Prenatal - methods</topic><topic>Umbilical Arteries - physiology</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Brackley, Karen J.</creatorcontrib><creatorcontrib>Ramsay, Margaret M.</creatorcontrib><creatorcontrib>Pipkin, Fiona Broughton</creatorcontrib><creatorcontrib>Rubin, Peter C.</creatorcontrib><collection>Pascal-Francis</collection><collection>Medline</collection><collection>MEDLINE</collection><collection>MEDLINE (Ovid)</collection><collection>MEDLINE</collection><collection>MEDLINE</collection><collection>PubMed</collection><collection>CrossRef</collection><collection>MEDLINE - Academic</collection><jtitle>BJOG : an international journal of obstetrics and gynaecology</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Brackley, Karen J.</au><au>Ramsay, Margaret M.</au><au>Pipkin, Fiona Broughton</au><au>Rubin, Peter C.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>A longitudinal study of umbilical artery Doppler waveforms in normal pregnancy: analysis using Laplace transform techniques</atitle><jtitle>BJOG : an international journal of obstetrics and gynaecology</jtitle><addtitle>Br J Obstet Gynaecol</addtitle><date>1998-01</date><risdate>1998</risdate><volume>105</volume><issue>1</issue><spage>78</spage><epage>82</epage><pages>78-82</pages><issn>1470-0328</issn><issn>0306-5456</issn><eissn>1471-0528</eissn><eissn>1365-215X</eissn><coden>BJOGAS</coden><abstract>Objective
To analyse umbilical artery Doppler waveforms using the Laplace transform analysis technique, an alternative method of waveform shape analysis, and to determine the normal ranges for the variables of this technique throughout normal pregnancy.
Design
A prospective longitudinal study.
Setting
Department of Obstetrics and Gynaecology, Nottingham University Hospital.
Sample
A cohort of 17 healthy women investigated every four weeks from the end of the first trimester until term.
Methods
Umbilical artery Doppler signals were recorded and analysed using the Laplace transform analysis technique. The median and interquartile ranges for each variable were determined and serial changes during pregnancy described.
Results
Vessel wall tone decreases in the umbilical artery at the beginning of the second trimester. Alpha, the variable related to upstream flow conditions, also decreases at this stage of pregnancy but values are then comparatively stable from 24 weeks of gestation until term. A fall in downstream resistance within the fetoplacental circulation during pregnancy is detected using the C‐coefficient. Real pole appears to be of no value in the assessment of downstream resistance to flow in the fetus.
Conclusions
The normal ranges for the Laplace transform analysis variables have been established for the umbilical artery longitudinally through normal pregnancy. Changes in fetal blood flow during complicated pregnancy can now be investigated using this technique.</abstract><cop>Oxford, UK</cop><pub>Blackwell Publishing Ltd</pub><pmid>9442166</pmid><doi>10.1111/j.1471-0528.1998.tb09354.x</doi><tpages>5</tpages></addata></record> |
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| identifier | ISSN: 1470-0328 |
| ispartof | BJOG : an international journal of obstetrics and gynaecology, 1998-01, Vol.105 (1), p.78-82 |
| issn | 1470-0328 0306-5456 1471-0528 1365-215X |
| language | eng |
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| source | MEDLINE; Wiley Online Library All Journals; Alma/SFX Local Collection |
| subjects | Adult Biological and medical sciences Female Gynecology. Andrology. Obstetrics Humans Longitudinal Studies Management. Prenatal diagnosis Medical sciences Pregnancy - physiology Pregnancy. Fetus. Placenta Prospective Studies Reference Values Ultrasonography, Doppler, Color Ultrasonography, Prenatal - methods Umbilical Arteries - physiology |
| title | A longitudinal study of umbilical artery Doppler waveforms in normal pregnancy: analysis using Laplace transform techniques |
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