Usefulness of Baseline Electrocardiographic QRS Complex Pattern to Predict Response to Cardiac Resynchronization
Abstract
Cardiac resynchronization therapy (CRT) improves morbidity and mortality in patients with heart failure with QRS>120 ms, yet most patients studied in clinical trials manifested baseline left branch bundle block (LBBB). It is unclear whether benefits of CRT extend to patients with right branch bundle block (RBBB) or a paced QRS at baseline despite QRS>120 ms. Orthotopic heart transplantation- and ventricular assist device-free survival, symptomatic response, and echocardiographic response were evaluated in the 636 patients who underwent CRT at our institution from 2000 to 2007 in whom the baseline electrocardiogram showed LBBB (n=412; 65%), paced QRS (n=162; 26%), or RBBB (n=62; 10%). Mortality was assessed using the Social Security Death Index, and the medical record was analyzed for clinical data. A decrease in New York Heart Association class>or=0.5 after >or=6 months of CRT defined symptomatic response. Echocardiographic evidence of improved left ventricular function and reverse remodeling was evaluated after >or=6 months of CRT. Survival free from orthotopic heart transplantation and ventricular assist device placement was best in patients with LBBB and worst in those with RBBB, whereas patients with paced QRS had an intermediate prognosis (p=0.003). This finding remained significant after controlling for baseline differences among the 3 groups. Symptomatic response was observed most often in patients with LBBB (60%), occurred least often in patients with RBBB (14%), and was intermediate in patients with paced QRS (46%; p<0.001). Echocardiographic improvement showed a similar stepwise trend. In conclusion, patients with RBBB undergoing CRT had low rates of symptomatic and echocardiographic response, and their survival free from orthotopic heart transplantation or ventricular assist device placement was significantly worse than in patients with LBBB. Patients with conventionally paced QRS experienced an intermediate response.
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Patients with RBBB undergoing CRT had low rates of symptomatic and echocardiographic response, and their survival free from orthotopic heart transplantation or ventricular assist device placement was significantly worse than in patients with LBBB.
“Patients with RBBB undergoing CRT had low rates of symptomatic and echocardiographic response, and their survival free from orthotopic heart transplantation or ventricular assist device placement was significantly worse than in patients with LBBB.19”
From The Year of 2008 in Electrocardiology (2010) · cites this paper as [19]
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- Authors
- Adelstein, E. C., & Saba, S.
- Affiliations
- University of Pittsburgh (US)
- Corresponding author
- Adelstein, Evan C.
- Venue
- The American Journal of Cardiology
- Publisher
- Elsevier BV
- Published
- 2009-01
- Volume
- 103
- Issue
- 2
- Pages
- 238-242
- ISSN
- 0002-9149 (ISSN-L)
- OpenAlex
- W2063717496
- Cited by
- 110
- References
- 13
- Citations by year
- 2026: 1 · 2025: 2 · 2024: 5 · 2023: 3 · 2021: 2 · 2020: 1 · 2018: 1 · 2017: 4 · 2016: 5 · 2015: 7 · 2014: 11 · 2013: 13 · 2012: 19
- FWCI
- 8.73
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- The American Journal of Cardiology (publishedVersion)
- PubMed (publishedVersion)
- Topics
- Health Sciences › Medicine › Cardiology and Cardiovascular Medicine › Cardiac pacing and defibrillation studies
- Health Sciences › Medicine › Emergency Medicine › Cardiac Arrest and Resuscitation
- Health Sciences › Medicine › Cardiology and Cardiovascular Medicine › Cardiac electrophysiology and arrhythmias
- Keywords
- cardiac resynchronization therapy, right bundle branch block, left bundle branch block, QRS morphology, heart failure, symptom response, left ventricular function, reverse remodeling, ventricular assist devices
- MeSH terms
- Aged, Bundle-Branch Block, Cardiac Pacing, Artificial, Echocardiography, Electrocardiography, Female, Heart Failure, Humans, Male, Predictive Value of Tests, Logistic Models, Proportional Hazards Models, Survival Analysis, Treatment Outcome
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