{"_id":"BemRYg9Rf3iR39RWc","bibbaseid":"thiagalingam-wallace-boyd-eipper-campbell-byth-ross-kovoor-noncontactmappingoftheleftventricleinsightsfromvalidationwithtransmuralcontactmapping-2004","downloads":0,"creationDate":"2016-07-01T21:38:41.939Z","title":"Noncontact mapping of the left ventricle: insights from validation with transmural contact mapping.","author_short":["Thiagalingam, A.","Wallace, E.","Boyd, A.","Eipper, V.","Campbell, C.","Byth, K.","Ross, D.","Kovoor, P."],"year":2004,"bibtype":"article","biburl":"http://www.sci.utah.edu/~macleod/Bibtex/biglit.bib","bibdata":{"bibtype":"article","type":"article","author":[{"firstnames":["A."],"propositions":[],"lastnames":["Thiagalingam"],"suffixes":[]},{"firstnames":["E.M."],"propositions":[],"lastnames":["Wallace"],"suffixes":[]},{"firstnames":["A.C."],"propositions":[],"lastnames":["Boyd"],"suffixes":[]},{"firstnames":["V.E."],"propositions":[],"lastnames":["Eipper"],"suffixes":[]},{"firstnames":["C.R."],"propositions":[],"lastnames":["Campbell"],"suffixes":[]},{"firstnames":["K."],"propositions":[],"lastnames":["Byth"],"suffixes":[]},{"firstnames":["D.L."],"propositions":[],"lastnames":["Ross"],"suffixes":[]},{"firstnames":["P."],"propositions":[],"lastnames":["Kovoor"],"suffixes":[]}],"title":"Noncontact mapping of the left ventricle: insights from validation with transmural contact mapping.","journal":"Pacing Clin Electrophysiol","year":"2004","month":"May","volume":"27","number":"5","pages":"570--578","robnote":"It is not clear whether the noncontact electrograms obtained using the EnSite system in the left ventricle resemble most closely endocardial, intramural, or epicardial contact electrograms or a summation of transmural electrograms. This study compared unipolar virtual electrograms from the EnSite system with unipolar contact electrograms from transmural plunge needle electrodes using a 256-channel mapping system. The study also evaluated the effects of differing activation sites (endocardial, intramural, or epicardial). A grid of 50-60 plunge needles was positioned in the left ventricles of eight male sheep. Correlations between contact and noncontact electrograms were calculated on 32,242 electrograms. Noncontact electrograms correlated equally well in morphology and accuracy of timing with endocardial (0.88 +/- 0.15), intramural (0.87 +/- 0.15), epicardial (0.88 +/- 0.15), and transmural summation contact electrograms (0.89 +/- 0.14) during sinus rhythm, endocardial pacing, and epicardial pacing. There was a nonlinear relationship between noncontact electrogram accuracy as measured by correlation with the contact electrogram and distance from the multielectrode array (MEA): beyond 40 mm accuracy decreased rapidly. The accuracy of noncontact electrograms also decreased with increasing distance from the equator of the MEA. Virtual electrograms from noncontact mapping of normal left ventricles probably represent a summation of transmural activation. Noncontact mapping has similar accuracy with either endocardial or epicardial sites of origin of electrical activity provided the MEA is within 40 mm of the recording site.","bibdate":"Sun Mar 12 13:30:51 2006","bibtex":"@Article{RSM:Thi2004,\n author = \"A. Thiagalingam and E.M. Wallace and A.C. Boyd and\n V.E. Eipper and C.R. Campbell and K. Byth and D.L. Ross\n and P. Kovoor\",\n title = \"Noncontact mapping of the left ventricle: insights\n from validation with transmural contact mapping.\",\n journal = \"Pacing Clin Electrophysiol\",\n year = \"2004\",\n month = may,\n volume = \"27\",\n number = \"5\",\n pages = \"570--578\",\n robnote = \"It is not clear whether the noncontact electrograms\n obtained using the EnSite system in the left ventricle\n resemble most closely endocardial, intramural, or\n epicardial contact electrograms or a summation of\n transmural electrograms. This study compared unipolar\n virtual electrograms from the EnSite system with\n unipolar contact electrograms from transmural plunge\n needle electrodes using a 256-channel mapping system.\n The study also evaluated the effects of differing\n activation sites (endocardial, intramural, or\n epicardial). A grid of 50-60 plunge needles was\n positioned in the left ventricles of eight male sheep.\n Correlations between contact and noncontact\n electrograms were calculated on 32,242 electrograms.\n Noncontact electrograms correlated equally well in\n morphology and accuracy of timing with endocardial\n (0.88 +/- 0.15), intramural (0.87 +/- 0.15), epicardial\n (0.88 +/- 0.15), and transmural summation contact\n electrograms (0.89 +/- 0.14) during sinus rhythm,\n endocardial pacing, and epicardial pacing. There was a\n nonlinear relationship between noncontact electrogram\n accuracy as measured by correlation with the contact\n electrogram and distance from the multielectrode array\n (MEA): beyond 40 mm accuracy decreased rapidly. The\n accuracy of noncontact electrograms also decreased with\n increasing distance from the equator of the MEA.\n Virtual electrograms from noncontact mapping of normal\n left ventricles probably represent a summation of\n transmural activation. Noncontact mapping has similar\n accuracy with either endocardial or epicardial sites of\n origin of electrical activity provided the MEA is\n within 40 mm of the recording site.\",\n bibdate = \"Sun Mar 12 13:30:51 2006\",\n}\n\n","author_short":["Thiagalingam, A.","Wallace, E.","Boyd, A.","Eipper, V.","Campbell, C.","Byth, K.","Ross, D.","Kovoor, P."],"key":"RSM:Thi2004","id":"RSM:Thi2004","bibbaseid":"thiagalingam-wallace-boyd-eipper-campbell-byth-ross-kovoor-noncontactmappingoftheleftventricleinsightsfromvalidationwithtransmuralcontactmapping-2004","role":"author","urls":{},"downloads":0,"html":""},"search_terms":["noncontact","mapping","left","ventricle","insights","validation","transmural","contact","mapping","thiagalingam","wallace","boyd","eipper","campbell","byth","ross","kovoor"],"keywords":[],"authorIDs":[],"dataSources":["5HG3Kp8zRwDd7FotB"]}