{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,14]],"date-time":"2026-10-14T03:50:15Z","timestamp":1791949815480,"version":"4.3.4"},"reference-count":15,"publisher":"Wiley","issue":"10","license":[{"start":{"date-parts":[[2026,9,3]],"date-time":"2026-09-03T00:00:00Z","timestamp":1788393600000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"},{"start":{"date-parts":[[2026,9,3]],"date-time":"2026-09-03T00:00:00Z","timestamp":1788393600000},"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":[[2026,10]]},"abstract":"<jats:title>ABSTRACT<\/jats:title>\n                  <jats:sec>\n                    <jats:title>Introduction<\/jats:title>\n                    <jats:p>Micra AV enables atrioventricular (AV)\u2013synchronous pacing by sensing atrial mechanical contraction (A4) using device's accelerometer. Short\u2010term studies showed good AV synchrony (AVS), but long\u2010term data are lacking.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Methods<\/jats:title>\n                    <jats:p>Within the OPTIVALL cohort, we identified patients implanted with a first\u2010generation Micra AV (June 2020\u2013February 2024) who remained in sinus rhythm and programmed in VDD for \u2265\u20091 year. Device\u2010derived AVS was collected annually (tracking index and total AVS\u2009=\u2009AM\u2010VP\u2009+\u2009AM\u2010VS) up to 4 years. A4 amplitude was recorded at each visit. A subgroup underwent 24\u2010h Holter\u2010ECG to assess ambulatory AVS at long\u2010term follow\u2010up. Atrial sensing had been optimized early after implant with no further adjustment at follow\u2010up.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results<\/jats:title>\n                    <jats:p>\n                      Of 54 implanted patients, 44 met inclusion criteria. Median (IQR) total AVS remained stable over time: 90.6% (85.4%\u201393.6%), 90.6% (83.1%\u201392.1%), 89.2% (84.3%\u201392.2%), and 89.3% (86.2%\u201391.6%) at 1, 2, 3, and 4 years, respectively (\n                      <jats:italic>p<\/jats:italic>\n                      \u2009=\u20090.789). Median (IQR) tracking index was 94.3% (88.9%\u201397.1%), 93.0% (85.0%\u201398.0%), 90.2% (84.4%\u201398.0%), and 90.0% (87.0%\u201393.9%) (\n                      <jats:italic>p<\/jats:italic>\n                      \u2009=\u20090.059). Median (IQR) A4 signal amplitude was 3.1 (2.0\u20135.1), 5.1 (2.1\u20135.1), 3.7 (1.9\u20135.1), and 5.1 (2.5\u20135.1)\u2009m\/s\n                      <jats:sup>2<\/jats:sup>\n                      (\n                      <jats:italic>p<\/jats:italic>\n                      \u2009=\u20090.993). In 20 patients with 24\u2010h Holter\u2010ECG at 2.7\u2009\u00b1\u20091.1 years, ambulatory AVS was 85.5% (80.0%\u201390.7%) and was comparable to the 3\u2010month value (87.9% (76.8%\u201393.1%);\n                      <jats:italic>p<\/jats:italic>\n                      \u2009=\u20090.811).\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusions<\/jats:title>\n                    <jats:p>When atrial sensing is optimized early, Micra AV can provide high and stable AV\u2010synchronous pacing for up to 4 years, with preserved A4 signal amplitude.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.1111\/jce.70490","type":"journal-article","created":{"date-parts":[[2026,9,4]],"date-time":"2026-09-04T05:53:03Z","timestamp":1788501183000},"page":"2289-2297","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Long\u2010Term Performance of Single\u2010Chamber Atrioventricular\u2010Synchronous Leadless Pacing: Results From 4 Years of Serial Follow\u2010up"],"prefix":"10.1111","volume":"37","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-7893-5581","authenticated-orcid":false,"given":"Sem","family":"Briongos\u2010Figuero","sequence":"first","affiliation":[{"name":"Cardiology Department Hospital Infanta Leonor Madrid Spain"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"\u00c1lvaro","family":"Est\u00e9vez\u2010Paniagua","sequence":"additional","affiliation":[{"name":"Cardiology Department Hospital 12 de Octubre Madrid Spain"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ana","family":"S\u00e1nchez\u2010Hern\u00e1ndez","sequence":"additional","affiliation":[{"name":"Cardiology Department Hospital Infanta Leonor Madrid Spain"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Silvia","family":"Jim\u00e9nez\u2010Loeches","sequence":"additional","affiliation":[{"name":"Cardiology Department Hospital Infanta Leonor Madrid Spain"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Eloy","family":"G\u00f3mez\u2010Mariscal","sequence":"additional","affiliation":[{"name":"Cardiology Department Hospital Infanta Leonor Madrid Spain"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6224-2756","authenticated-orcid":false,"given":"Elena","family":"S\u00e1nchez\u2010L\u00f3pez","sequence":"additional","affiliation":[{"name":"Cardiology Department Hospital Infanta Leonor Madrid Spain"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Beatriz","family":"Jim\u00e9nez\u2010Guti\u00e9rrez","sequence":"additional","affiliation":[{"name":"Cardiology Department Hospital Infanta Leonor Madrid Spain"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Miguel Eduardo","family":"Jauregui\u2010Abularach","sequence":"additional","affiliation":[{"name":"Cardiology Department Hospital Infanta Leonor Madrid Spain"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8207-7604","authenticated-orcid":false,"given":"David","family":"Vaqueriza\u2010Cubillo","sequence":"additional","affiliation":[{"name":"Cardiology Department Hospital Infanta Leonor Madrid Spain"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Roberto","family":"Mu\u00f1oz\u2010Aguilera","sequence":"additional","affiliation":[{"name":"Cardiology Department Hospital Infanta Leonor Madrid Spain"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2026,9,3]]},"reference":[{"key":"e_1_2_11_2_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.hrthm.2018.05.004"},{"key":"e_1_2_11_3_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.jacep.2019.10.017"},{"key":"e_1_2_11_4_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.hrthm.2022.08.007"},{"key":"e_1_2_11_5_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.hrthm.2022.08.033"},{"key":"e_1_2_11_6_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.hrthm.2024.10.065"},{"key":"e_1_2_11_7_1","doi-asserted-by":"publisher","DOI":"10.1111\/jce.15981"},{"key":"e_1_2_11_8_1","doi-asserted-by":"publisher","DOI":"10.1111\/jce.15726"},{"key":"e_1_2_11_9_1","doi-asserted-by":"publisher","DOI":"10.1111\/jce.15430"},{"key":"e_1_2_11_10_1","doi-asserted-by":"publisher","DOI":"10.1111\/jce.16016"},{"key":"e_1_2_11_11_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.hrthm.2020.07.024"},{"key":"e_1_2_11_12_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.hrthm.2024.02.061"},{"key":"e_1_2_11_13_1","doi-asserted-by":"publisher","DOI":"10.1093\/europace\/eut206"},{"key":"e_1_2_11_14_1","doi-asserted-by":"publisher","DOI":"10.1093\/europace\/euac066"},{"key":"e_1_2_11_15_1","doi-asserted-by":"publisher","DOI":"10.1093\/eurheartj\/ehv214"},{"key":"e_1_2_11_16_1","doi-asserted-by":"publisher","DOI":"10.1109\/TBME.2003.821031"}],"container-title":["Journal 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