{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,6,1]],"date-time":"2026-06-01T16:42:56Z","timestamp":1780332176351,"version":"3.54.1"},"reference-count":42,"publisher":"Wiley","issue":"1","license":[{"start":{"date-parts":[[2018,12,15]],"date-time":"2018-12-15T00:00:00Z","timestamp":1544832000000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":["onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["Clinical Cardiology"],"published-print":{"date-parts":[[2019,1]]},"abstract":"<jats:sec><jats:title>Introduction<\/jats:title><jats:p>Current guidelines recommend at least 3 months of guideline\u2010directed medical therapy (GDMT) for patients with a new onset of non\u2010ischemic cardiomyopathy (NICM) and left bundle branch block (LBBB) prior to cardiac resynchronization therapy (CRT). For patients who do not receive optimal GDMT, response to CRT is unknown.<\/jats:p><\/jats:sec><jats:sec><jats:title>Methods<\/jats:title><jats:p>Patients with NICM and LBBB with QRS \u2265 120 ms were identified among all patients who underwent CRT. Patients who received GDMT for \u2265 3 months before CRT were compared to those who did not. Among 38 patients who met inclusion criteria, 24 received optimal GDMT prior to implantation (Group 1) and 14 did not (Group 2).<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>QRS narrowing occurred in Group 1 (160 \u00b1 9 ms to 138 \u00b1 20 ms, <jats:italic>P<\/jats:italic> = 0.001) and Group 2 (160 \u00b1 17 ms to 139 \u00b1 30 ms, <jats:italic>P<\/jats:italic> = 0.021). Left ventricular ejection fraction (LVEF) improvement occurred in Group 1 (21.3 \u00b1 5.9% to 34.4 \u00b1 13.9%, <jats:italic>P<\/jats:italic> &lt; 0.001) and Group 2 (18.8 \u00b1 4.7% to 31.1 \u00b1 13%, <jats:italic>P<\/jats:italic> = 0.010). QRS interval and LVEF changes were similar between groups (<jats:italic>P<\/jats:italic> = NS). There was a trend towards greater CRT response in women than in men, although differences did not reach statistical significance.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusion<\/jats:title><jats:p>In patients with NICM and LBBB, CRT is associated with improvements in LV size and function independent of prior GDMT. The ability of resynchronization to improve LVEF without GDMT suggests that CRT without waiting 3 months for GDMT optimization may benefit some patients with NICM and LBBB.<\/jats:p><\/jats:sec>","DOI":"10.1002\/clc.23123","type":"journal-article","created":{"date-parts":[[2018,11,23]],"date-time":"2018-11-23T08:51:04Z","timestamp":1542963064000},"page":"143-150","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":4,"title":["Response to cardiac resynchronization therapy in non\u2010ischemic cardiomyopathy is unrelated to medical therapy"],"prefix":"10.1002","volume":"42","author":[{"given":"Gregory","family":"Sinner","sequence":"first","affiliation":[{"name":"Gill Heart Institute, University of Kentucky  Lexington Kentucky"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hesham R.","family":"Omar","sequence":"additional","affiliation":[{"name":"Internal Medicine Department Mercy Medical Center, Clinton  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