{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,10]],"date-time":"2026-09-10T05:47:26Z","timestamp":1789019246271,"version":"build-2803163510"},"reference-count":12,"publisher":"American Medical Association (AMA)","issue":"6","content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["JAMA Cardiol"],"published-print":{"date-parts":[[2023,6,1]]},"abstract":"<jats:sec><jats:title>Importance<\/jats:title><jats:p>Left ventricular conduction disease predicts heart failure and death, and the only strategies to mitigate its effects involve implantation of a permanent pacemaker. There are currently no proven preventive strategies for this common condition.<\/jats:p><\/jats:sec><jats:sec><jats:title>Objective<\/jats:title><jats:p>To determine the association between targeting intensive blood pressure (BP) control and the risk of developing left ventricular conduction disease.<\/jats:p><\/jats:sec><jats:sec><jats:title>Design, Setting, and Participants<\/jats:title><jats:p>This was a post hoc analysis of the 2-arm multicenter Systolic Blood Pressure Intervention Trial (SPRINT), which recruited participants from 102 sites in the US and Puerto Rico and was conducted from November 2010 until August 2015. Adults 50 years and older with hypertension and at least 1 other cardiovascular risk factor were included. Participants with baseline left ventricular conduction disease, ventricular pacing, or ventricular pre-excitation were excluded for the current analysis. Data were analyzed from November 2021 to November 2022.<\/jats:p><\/jats:sec><jats:sec><jats:title>Intervention<\/jats:title><jats:p>Participants were randomly assigned to a systolic BP target of less than 140 mm Hg (standard treatment group) or less than 120 mm Hg (intensive treatment group).<\/jats:p><\/jats:sec><jats:sec><jats:title>Main Outcome<\/jats:title><jats:p>The primary outcome was incident left ventricular conduction disease, including any fascicular or left bundle-branch block, assessed by serial electrocardiography. Incident right bundle-branch block was examined as a negative control.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>Among 3918 participants randomized to standard treatment and 3956 to intensive treatment (mean [SD] age, 67.6 [9.2] years; 2815 [36%] female) monitored for a median [IQR] 3.5 (0.02-5.2) years, 203 developed left ventricular conduction disease. Older age (hazard ratio per 10-year increase [HR], 1.42; 95% CI, 1.21-1.67; <jats:italic>P<\/jats:italic>\u2009&amp;amp;lt;\u2009.001), male sex (HR, 2.31; 95% CI, 1.63-3.32; <jats:italic>P<\/jats:italic>\u2009&amp;amp;lt;\u2009.001), and cardiovascular disease (HR, 1.46; 95% CI, 1.06-2.00; <jats:italic>P<\/jats:italic>\u2009=\u2009.02) were associated with a higher risk of left ventricular conduction disease. Assignment to intensive treatment was associated with a 26% lower risk of left ventricular conduction disease (HR, 0.74; 95% CI, 0.56-0.98; <jats:italic>P<\/jats:italic>\u2009=\u2009.04). These results persisted when incident ventricular pacing was included in the outcome and when considering all-cause death as a competing risk. In contrast, no association between randomization assignment and right bundle-branch block was observed (HR, 0.95; 95% CI, 0.71-1.27; <jats:italic>P<\/jats:italic>\u2009=\u2009.75).<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusions and Relevance<\/jats:title><jats:p>In this study, targeting intensive BP control was associated with lower risk of left ventricular conduction disease in a randomized clinical trial, suggesting that clinically relevant conduction disease may be preventable.<\/jats:p><\/jats:sec><jats:sec><jats:title>Trial Registration<\/jats:title><jats:p>ClinicalTrials.gov Identifier: <jats:ext-link xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" ext-link-type=\"uri\" xlink:href=\"https:\/\/clinicaltrials.gov\/ct2\/show\/NCT01206062\">NCT01206062<\/jats:ext-link><\/jats:p><\/jats:sec>","DOI":"10.1001\/jamacardio.2023.0845","type":"journal-article","created":{"date-parts":[[2023,5,3]],"date-time":"2023-05-03T15:13:30Z","timestamp":1683126810000},"page":"612","source":"Crossref","is-referenced-by-count":14,"title":["Association Between Intensive vs Standard Blood Pressure Control and Incident Left Ventricular Conduction Disease"],"prefix":"10.1001","volume":"8","author":[{"given":"Emilie K.","family":"Frimodt-M\u00f8ller","sequence":"first","affiliation":[{"name":"Division of Cardiology, Department of Medicine, University of California San Francisco"},{"name":"Department of Cardiology, Herlev and Gentofte Hospital, Copenhagen, Denmark"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Eric","family":"Vittinghoff","sequence":"additional","affiliation":[{"name":"Division of Cardiology, Department of Medicine, University of California San Francisco"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Gurbani","family":"Kaur","sequence":"additional","affiliation":[{"name":"Division of Cardiology, Department of Medicine, University of California San Francisco"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Tor","family":"Biering-S\u00f8rensen","sequence":"additional","affiliation":[{"name":"Department of Cardiology, Herlev and Gentofte Hospital, Copenhagen, Denmark"},{"name":"Department of Biomedical Sciences, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Elsayed Z.","family":"Soliman","sequence":"additional","affiliation":[{"name":"Section of Cardiovascular Medicine, Wake Forest School of Medicine, Winston-Salem, North Carolina"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Gregory M.","family":"Marcus","sequence":"additional","affiliation":[{"name":"Division of Cardiology, Department of Medicine, University of California San Francisco"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"10","reference":[{"issue":"15","key":"hbr230004r1","doi-asserted-by":"publisher","first-page":"1587","DOI":"10.1001\/jama.2013.2729","article-title":"Long-term outcomes of left anterior fascicular block in the absence of overt cardiovascular disease.","volume":"309","author":"Mandyam","year":"2013","journal-title":"JAMA"},{"issue":"5","key":"hbr230004r2","doi-asserted-by":"publisher","first-page":"704","DOI":"10.1161\/CIRCEP.111.963561","article-title":"Intraventricular conduction delay in a standard 12-lead electrocardiogram as a predictor of mortality in the general population.","volume":"4","author":"Aro","year":"2011","journal-title":"Circ Arrhythm Electrophysiol"},{"issue":"3","key":"hbr230004r3","doi-asserted-by":"publisher","first-page":"343","DOI":"10.1007\/s10840-018-0407-2","article-title":"Left bundle branch block-induced left ventricular remodeling and its potential for reverse remodeling.","volume":"52","author":"Sze","year":"2018","journal-title":"J Interv Card Electrophysiol"},{"issue":"8","key":"hbr230004r4","doi-asserted-by":"publisher","first-page":"932","DOI":"10.1161\/CIR.0000000000000628","article-title":"ACC\/AHA\/HRS guideline on the evaluation and management of patients with bradycardia and cardiac conduction delay: a report of the American College of Cardiology\/American Heart Association Task Force on Clinical Practice Guidelines and the Heart Rhythm Society.","volume":"140","author":"Kusumoto","year":"2019","journal-title":"Circulation"},{"issue":"3","key":"hbr230004r5","doi-asserted-by":"publisher","first-page":"303","DOI":"10.7326\/0003-4819-90-3-303","article-title":"Newly acquired left bundle-branch block: the Framingham study.","volume":"90","author":"Schneider","year":"1979","journal-title":"Ann Intern Med"},{"issue":"22","key":"hbr230004r6","doi-asserted-by":"publisher","first-page":"2494","DOI":"10.1161\/01.CIR.98.22.2494","article-title":"Bundle-branch block in a general male population: the study of men born 1913.","volume":"98","author":"Eriksson","year":"1998","journal-title":"Circulation"},{"issue":"5","key":"hbr230004r7","doi-asserted-by":"publisher","first-page":"532","DOI":"10.1177\/1740774514537404","article-title":"The design and rationale of a multicenter clinical trial comparing two strategies for control of systolic blood pressure: the Systolic Blood Pressure Intervention Trial (SPRINT).","volume":"11","author":"Ambrosius","year":"2014","journal-title":"Clin Trials"},{"issue":"446","key":"hbr230004r8","doi-asserted-by":"publisher","first-page":"496","DOI":"10.1080\/01621459.1999.10474144","article-title":"A proportional hazards model for the subdistribution of a competing risk.","volume":"94","author":"Fine","year":"1999","journal-title":"J Am Stat Assoc"},{"key":"hbr230004r9","doi-asserted-by":"publisher","first-page":"67","DOI":"10.1016\/j.ejim.2019.11.006","article-title":"Nonspecific intraventricular conduction delay is associated with future occurrence of atrial fibrillation in patients with structurally normal heart.","volume":"72","author":"Uhm","year":"2020","journal-title":"Eur J Intern Med"},{"issue":"1","key":"hbr230004r10","first-page":"76","article-title":"The role of extracellular matrix in age-related conduction disorders: a forgotten player?","volume":"12","author":"Spadaccio","year":"2015","journal-title":"J Geriatr Cardiol"},{"issue":"6 Pt 2","key":"hbr230004r11","doi-asserted-by":"publisher","first-page":"III108","DOI":"10.1161\/01.HYP.6.6_Pt_2.III108","article-title":"Left ventricular function in early primary hypertension. functional consequences of cardiovascular structural changes.","volume":"6","author":"Wikstrand","year":"1984","journal-title":"Hypertension"},{"issue":"3","key":"hbr230004r12","doi-asserted-by":"publisher","first-page":"233","DOI":"10.1007\/s11906-008-0044-8","article-title":"Neurohormonal regulation of the sympathetic nervous system: new insights into central mechanisms of action.","volume":"10","author":"Carlson","year":"2008","journal-title":"Curr Hypertens Rep"}],"container-title":["JAMA Cardiology"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/jamanetwork.com\/journals\/jamacardiology\/articlepdf\/2804441\/jamacardiology_frimodtmller_2023_br_230004_1686672899.21292.pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2023,6,14]],"date-time":"2023-06-14T15:01:39Z","timestamp":1686754899000},"score":1,"resource":{"primary":{"URL":"https:\/\/jamanetwork.com\/journals\/jamacardiology\/fullarticle\/2804441"}},"subtitle":["A Post Hoc Analysis of the SPRINT Randomized Clinical Trial"],"short-title":[],"issued":{"date-parts":[[2023,6,1]]},"references-count":12,"journal-issue":{"issue":"6","published-print":{"date-parts":[[2023,6,1]]}},"URL":"https:\/\/doi.org\/10.1001\/jamacardio.2023.0845","relation":{},"ISSN":["2380-6583"],"issn-type":[{"value":"2380-6583","type":"print"}],"subject":[],"published":{"date-parts":[[2023,6,1]]}}}