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dc.contributor.authorRivett, Darrenen_US
dc.contributor.authorSharples, Katrinaen_US
dc.contributor.authorMilburn, Peteren_US
dc.date.accessioned2017-04-24T13:04:53Z
dc.date.available2017-04-24T13:04:53Z
dc.date.issued2003en_US
dc.date.modified2009-12-18T06:31:36Z
dc.identifier.issn03037193en_US
dc.identifier.urihttp://hdl.handle.net/10072/27743
dc.description.abstractClinical tests involving sustained cervical spine rotation and/or extension are commonly applied pre-manipulatively to screen for patients at risk of stroke due to vertebral artery pathology. This is despite the fact that the validity of these manoeuvres is disputed and their effect on vertebral artery blood flow poorly understood. Recent research has mployed duplex ultrasound (Doppler with Bmode real-time imaging capability) to quantify positional haemodynamic parameters and determine whether subjects testing positive differ from negative subjects. However, the reliability of Doppler sampling of the upper cervical part of the vertebral artery in positions involving rotation and extension has not been established. Thus the aim of this study was to evaluate the reliability and measurement variability associated with this investigative procedure. Methods: Twenty normal subjects volunteered to participate in the study. Haemodynamic measurements were taken of a randomly selected vertebral artery using duplex ultrasound with colour flow and power Doppler imaging capabilities. Blood flow was recorded at both the atlanto-axial and the C2/3 regions of the vessel in neutral, end-range extension and end-range contralateral rotation. The protocol was then repeated. Results: Intraclass correlation coefficients (2, 1) and 95% limits of agreement indicated that sampling at the more vulnerable but less accessible atlanto-axial site was generally more repeatable, notably in end-range contralateral rotation. In particular, the key measures of atlanto-axial peak systolic velocity and resistance index in end-range rotation demonstrated excellent reliability (0.82; 0.76). Between group differences of -12.9 to 16.6 cm/s and -0.11 to 0.17 respectively would be necessary to discount measurement variability. Conclusions: Accurate interpretation of the results of ultrasonographic investigation of vertebral artery tests utilising rotation and extension requires consideration of measurement variability and reliability. Haemodynamic parameters of acceptable reliability and associated ranges of measurement variability have been identified for use in future research.en_US
dc.description.peerreviewedYesen_US
dc.description.publicationstatusYesen_AU
dc.languageEnglishen_US
dc.language.isoen_AU
dc.publisherNew Zealand Society of Physiotherapists (Inc.)en_US
dc.publisher.placeNew Zealanden_US
dc.publisher.urihttp://www.physiotherapy.org.nz/MainMenuen_AU
dc.relation.ispartofpagefrom119en_US
dc.relation.ispartofpageto128en_US
dc.relation.ispartofissue1en_US
dc.relation.ispartofjournalNew Zealand Journal of Physiotherapyen_US
dc.relation.ispartofvolume31en_US
dc.subject.fieldofresearchcode329903en_US
dc.titleReliability of ultrasonographic measurement of vertebral artery blood flowen_US
dc.typeJournal articleen_US
dc.type.descriptionC1 - Peer Reviewed (HERDC)en_US
dc.type.codeC - Journal Articlesen_US
gro.date.issued2003
gro.hasfulltextNo Full Text


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