کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
2924266 1175900 2009 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Upgrade and de novo cardiac resynchronization therapy: Impact of paced or intrinsic QRS morphology on outcomes and survival
موضوعات مرتبط
علوم پزشکی و سلامت پزشکی و دندانپزشکی کاردیولوژی و پزشکی قلب و عروق
پیش نمایش صفحه اول مقاله
Upgrade and de novo cardiac resynchronization therapy: Impact of paced or intrinsic QRS morphology on outcomes and survival
چکیده انگلیسی

BackgroundCardiac resynchronization therapy (CRT) improves outcomes in patients with left bundle branch block (LBBB), but the benefits of CRT in patients with other QRS morphologies or previous pacing are uncertain.ObjectiveThe purpose of this study was to describe outcomes in patients with prior right ventricular pacing and non-LBBB morphologies.MethodsWe studied 505 patients who underwent de novo CRT (n = 338) or CRT upgrade (n = 167). De novo patients were categorized by underlying QRS morphology: LBBB (67%), right bundle branch block (RBBB; 11%), intraventricular conduction delay (IVCD; 13%), and QRS <120 ms (9%). Upgrade patients were categorized by the percentage of previous ventricular pacing.ResultsPatients were followed for death over a median of 2.6 years (interquartile range 1.6–4.0). New York Heart Association (NYHA) functional class and echocardiographic improvements were similar in de novo and upgrade patients. However, within the de novo group, NYHA improvements were less in patients with RBBB (0.3 ± 0.8; P = .014) or IVCD (0.2 ± 0.7; P = .001) than in those with LBBB (0.7 ± 0.8). These patients had less left ventricular functional improvement as well. Survival was comparable after de novo versus upgrade CRT (61% vs 63% at 4 years; P = .906). No clinical or survival differences were noted in upgrade patients based on the percentage of previous pacing. However, survival in de novo CRT recipients with RBBB (32%) was lower than in those with LBBB (66%; P <.001), and RBBB independently predicted death (hazard ratio 3.5, confidence interval 1.9–6.5; P <.001).ConclusionRBBB and IVCD result in less clinical improvement or worsened survival after CRT. Additional selection criteria may be beneficial in identifying potential responders with RBBB, IVCD, or narrow QRS.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Heart Rhythm - Volume 6, Issue 10, October 2009, Pages 1439–1447
نویسندگان
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