{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,5,16]],"date-time":"2026-05-16T00:48:43Z","timestamp":1778892523086,"version":"3.51.4"},"reference-count":32,"publisher":"Wiley","issue":"9","license":[{"start":{"date-parts":[[2017,9,19]],"date-time":"2017-09-19T00:00:00Z","timestamp":1505779200000},"content-version":"vor","delay-in-days":18,"URL":"http:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100000265","name":"Medical Research Council","doi-asserted-by":"publisher","award":["G1000326"],"award-info":[{"award-number":["G1000326"]}],"id":[{"id":"10.13039\/501100000265","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100000272","name":"National Institute for Health Research","doi-asserted-by":"publisher","id":[{"id":"10.13039\/501100000272","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100004941","name":"Guy's and St Thomas' NHS Foundation Trust","doi-asserted-by":"publisher","id":[{"id":"10.13039\/501100004941","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100000764","name":"Kings College London","doi-asserted-by":"publisher","id":[{"id":"10.13039\/501100000764","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Cardiovasc electrophysiol"],"published-print":{"date-parts":[[2017,9]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:sec><jats:title>Introduction<\/jats:title><jats:p>Bipolar voltage is used during electroanatomic mapping to define abnormal myocardium, but the effect of activation rate on bipolar voltage is not known. We hypothesized that bipolar voltage may change in response to activation rate. By examining corresponding unipolar signals we sought to determine the mechanisms of such changes.<\/jats:p><\/jats:sec><jats:sec><jats:title>Methods and results<\/jats:title><jats:p>LA extrastimulus mapping was performed during CS pacing in 10 patients undergoing first time paroxysmal atrial fibrillation ablation. Bipolar and unipolar electrograms were recorded using a PentaRay catheter (4\u20104\u20104 spacing) and indifferent IVC electrode, respectively. An S1S2 pacing protocol was delivered with extrastimulus coupling interval reducing from 350\u00a0to 200\u00a0milliseconds. At each recording site (119 \u00b1 37 per LA), bipolar peak\u2010to\u2010peak voltage, unipolar peak to peak voltage and activation delay between unipole pairs was measured. Four patterns of bipolar voltage\/extrastimulus coupling interval curves were seen: voltage attenuation with plateau voltage &gt;1\u00a0mV (48 \u00b1 15%) or &lt;1\u00a0mV (22 \u00b1 15%), and voltage unaffected by coupling interval with plateau voltage &gt;1\u00a0mV (17 \u00b1 10%) or &lt;1\u00a0mV (13 \u00b1 8%). Electrograms showing bipolar voltage attenuation were associated with significantly greater unipolar voltage attenuation at low (25 \u00b1 28\u00a0mV\/s vs. 9 \u00b1 11\u00a0mV\/s) and high (23 \u00b1 29\u00a0mV\/s vs. 6 \u00b1 12\u00a0mV\/s) plateau voltage sites (P &lt; 0.001). There was a small but significant increase in conduction delay between unipole pairs at sites showing bipolar voltage attenuation (P = 0.026).<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusions<\/jats:title><jats:p>Bipolar electrogram voltage is dependent on activation rate at a significant proportion of sites. Changes in unipolar voltage and timing underlie these effects. These observations have important implications for use of voltage mapping to delineate abnormal atrial substrate.<\/jats:p><\/jats:sec>","DOI":"10.1111\/jce.13282","type":"journal-article","created":{"date-parts":[[2017,6,22]],"date-time":"2017-06-22T11:52:40Z","timestamp":1498132360000},"page":"1028-1036","source":"Crossref","is-referenced-by-count":28,"title":["The effect of activation rate on left atrial bipolar voltage in patients with paroxysmal atrial fibrillation"],"prefix":"10.1111","volume":"28","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-7266-2084","authenticated-orcid":false,"given":"Steven E","family":"Williams","sequence":"first","affiliation":[{"name":"Division of Imaging Sciences and Biomedical Imaging King's College London"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Nick","family":"Linton","sequence":"additional","affiliation":[{"name":"Division of Imaging Sciences and Biomedical Imaging King's College 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