{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,3,8]],"date-time":"2026-03-08T15:57:06Z","timestamp":1772985426566,"version":"3.50.1"},"reference-count":23,"publisher":"Wiley","issue":"5","license":[{"start":{"date-parts":[[2025,2,20]],"date-time":"2025-02-20T00:00:00Z","timestamp":1740009600000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"},{"start":{"date-parts":[[2025,2,20]],"date-time":"2025-02-20T00:00:00Z","timestamp":1740009600000},"content-version":"tdm","delay-in-days":0,"URL":"http:\/\/doi.wiley.com\/10.1002\/tdm_license_1.1"}],"content-domain":{"domain":["onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["Cardiovasc electrophysiol"],"published-print":{"date-parts":[[2025,5]]},"abstract":"<jats:title>ABSTRACT<\/jats:title>\n                  <jats:sec>\n                    <jats:title>Introduction<\/jats:title>\n                    <jats:p>An effective cardiac resynchronization therapy (CRT) algorithm classifies each left ventricular (LV) pace as effective or ineffective based on electrogram morphology. Loss of capture, latency, pseudo\u2010fusion during sinus rhythm, and rapid ventricular responses due to atrial fibrillation (AF) and premature ventricular conductions (PVCs) are potential causes of ineffective CRT pacing. However, little is known about the relationship between percentage of ineffective CRT pacing (%i\u2010CRT) and CRT response.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Methods and Results<\/jats:title>\n                    <jats:p>\n                      Among 136 consecutive CRT recipients, we evaluated 44 patients with an effective CRT algorithm. The primary outcome was the prevalence of CRT responders, defined as a reduction in the LV end\u2010systolic volume by \u2265\u200910% 6 months after implantation. The median values of percent ventricular pacing and %i\u2010CRT were 97.5% (interquartile range [IQR]: 96.4%\u201398.3%) and 0.3% (IQR: 0.1%\u20131.0%), respectively. Patients in the highest quartile of %i\u2010CRT (%i\u2010CRT\u2009\u2265\u20091%) showed a significantly lower prevalence of CRT responders (4 [36.4%] vs. 28 [84.8%],\n                      <jats:italic>p<\/jats:italic>\n                      \u2009=\u20090.004) than the remaining quartiles. The univariate analysis showed that %i\u2010CRT\u2009\u2265\u20091% was negatively associated with the CRT response (odds ratio: 0.10, 95% confidence interval: 0.02\u20130.48). The most frequent cause of ineffective pacing was rapid ventricular responses due to AF and\/or PVCs, whereas the cause of the highest %i\u2010CRT in this cohort was latency. A total of three nonresponders with a high %i\u2010CRT showed favorable responses after therapeutic interventions for their hidden causes.\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusion<\/jats:title>\n                    <jats:p>High %i\u2010CRT could be associated with an unfavorable CRT response and provide insights into hidden causes and therapeutic targets.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.1111\/jce.16605","type":"journal-article","created":{"date-parts":[[2025,2,20]],"date-time":"2025-02-20T23:35:12Z","timestamp":1740094512000},"page":"925-934","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["Presence of Ineffective Cardiac Resynchronization Therapy Pacing Provides Insights Into Hidden Causes and Therapeutic Targets of Nonresponder"],"prefix":"10.1111","volume":"36","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-6257-1421","authenticated-orcid":false,"given":"Satoshi","family":"Oka","sequence":"first","affiliation":[{"name":"Department of Cardiovascular Medicine National Cerebral and Cardiovascular Center Suita Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Nobuhiko","family":"Ueda","sequence":"additional","affiliation":[{"name":"Department of Cardiovascular Medicine National Cerebral and Cardiovascular Center Suita Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Mitsuru","family":"Wada","sequence":"additional","affiliation":[{"name":"Department of Cardiovascular Medicine National Cerebral and Cardiovascular Center Suita Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Kohei","family":"Ishibashi","sequence":"additional","affiliation":[{"name":"Department of Cardiovascular Medicine National Cerebral and Cardiovascular Center Suita Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Toshihiro","family":"Nakamura","sequence":"additional","affiliation":[{"name":"Department of Cardiovascular Medicine National Cerebral and Cardiovascular Center Suita Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Yuichiro","family":"Miyazaki","sequence":"additional","affiliation":[{"name":"Department of Cardiovascular Medicine National Cerebral and Cardiovascular Center Suita Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Akinori","family":"Wakamiya","sequence":"additional","affiliation":[{"name":"Department of Cardiovascular Medicine National Cerebral and Cardiovascular Center Suita Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Hideaki","family":"Kanzaki","sequence":"additional","affiliation":[{"name":"Department of Cardiovascular Medicine National Cerebral and Cardiovascular Center Suita Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Chisato","family":"Izumi","sequence":"additional","affiliation":[{"name":"Department of Cardiovascular Medicine National Cerebral and Cardiovascular Center Suita Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Kengo","family":"Kusano","sequence":"additional","affiliation":[{"name":"Department of Cardiovascular Medicine National Cerebral and Cardiovascular Center Suita 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