A comparison of the Mason-Likar and clinical standard 12-lead ECG for exercise-induced ST-segment shifts in males at high risk for CAD

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dc.contributor.authorShell, David Glenen
dc.contributor.departmentExercise Physiologyen
dc.date.accessioned2014-03-14T21:33:40Zen
dc.date.adate2009-04-14en
dc.date.available2014-03-14T21:33:40Zen
dc.date.issued1994en
dc.date.rdate2009-04-14en
dc.date.sdate2009-04-14en
dc.description.abstractThis study sought to examine the exercise-induced ST-segment shifts, J₀ and J₆₀, attributable to ECG lead configuration, specifically to evaluate if ischemic changes are modified as a function of using the Mason-Likar lead system. Males (N=30) referred for diagnostic testing underwent a symptom-limited graded exercise test (SLGXT). ST-segment shifts, J₀ and J₆₀, measured as the difference from baseline to recovery minute one, were not significantly different in responses measured from two simultaneous complexes for lead V₅. In frontal lead II, differences were found in the ST-segment response at baseline vs. recovery minute one. All ST-segment shifts were computed as the difference between J<sub>x</sub> obtained at resting baseline vs. the J<sub>x</sub> obtained at the exercise measurement in the same posture. ST-segment shifts, J₀ and J₆₀, measured at peak-exercise vs. recovery minute one using the Mason-Likar lead system, revealed a significant difference according to the measurement recorded in both leads V₅ and II (p<.05). Comparisons of frequencies for clinically abnormal ST-segment shifts according to ECG lead configuration at recovery minute one when measured from peak-exercise using Mason-Likar were significant in only lead II (p<.05). Observation of the data suggest that the Mason-Likar lead system may affect the interpretation of ischemic ST-segment shifts in lead II. However, these results do not invalidate the interpretation of ischemic ST-segment shifts in lead V₅ using the Mason-Likar lead system.en
dc.description.degreeMaster of Scienceen
dc.format.extentix, 117 leavesen
dc.format.mediumBTDen
dc.format.mimetypeapplication/pdfen
dc.identifier.otheretd-04142009-040320en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-04142009-040320/en
dc.identifier.urihttp://hdl.handle.net/10919/42056en
dc.language.isoenen
dc.publisherVirginia Techen
dc.relation.haspartLD5655.V855_1994.S543.pdfen
dc.relation.isformatofOCLC# 32711715en
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subject.lccLD5655.V855 1994.S543en
dc.subject.lcshCoronary heart disease -- Diagnosisen
dc.subject.lcshElectrocardiographyen
dc.subject.lcshHeart function testsen
dc.titleA comparison of the Mason-Likar and clinical standard 12-lead ECG for exercise-induced ST-segment shifts in males at high risk for CADen
dc.typeThesisen
dc.type.dcmitypeTexten
thesis.degree.disciplineExercise Physiologyen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.levelmastersen
thesis.degree.nameMaster of Scienceen

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