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Korean Circ J. 2019 Jul;49(7):602-611. English. Original Article. https://doi.org/10.4070/kcj.2018.0290
Lee JH , Park JJ , Cho Y , Oh IY , Yoo BS , Kim JJ , Kim KH , Kang SM , Baek SH , Jeon ES , Cho MC , Chae SC , Oh BH , Choi DJ .
Department of Internal Medicine, Yonsei University Wonju College of Medicine, Wonju, Korea.
Department of Cardiology, Cardiovascular Center, Seoul National University Bundang Hospital, Seongnam, Korea. djchoi@snubh.org
Division of Cardiology, Heart Institute, Asan Medical Center, University of Ulsan, Seoul, Korea.
Department of Internal Medicine, Heart Research Center of Chonnam National University, Gwangju, Korea.
Department of Internal Medicine, Yonsei University College of Medicine, Seoul, Korea.
Department of Internal Medicine, College of Medicine, The Catholic University of Korea, Seoul, Korea.
Department of Internal Medicine, Sungkyunkwan University College of Medicine, Seoul, Korea.
Department of Internal Medicine, Chungbuk National University College of Medicine, Cheongju, Korea.
Department of Internal Medicine, Kyungpook National University College of Medicine, Daegu, Korea.
Department of Internal Medicine, Seoul National University Hospital, Seoul, Korea.
Abstract

Background and Objectives

Conflicting data exist regarding the prognostic implication of ventricular conduction disturbance pattern in patients with heart failure (HF). This study investigated the prognostic impact of ventricular conduction pattern in hospitalized patients with acute HF.

Methods

Data from the Korean Acute Heart Failure registry were used. Patients were categorized into four groups: narrow QRS (<120 ms), right bundle branch block (RBBB), left bundle branch block (LBBB), and nonspecific intraventricular conduction delay (NICD). The NICD was defined as prolonged QRS (≥120 ms) without typical features of LBBB or RBBB. The primary endpoint was the composite of all-cause mortality or rehospitalization for HF aggravation within 1 year after discharge.

Results

This study included 5,157 patients. The primary endpoint occurred in 39.7% of study population. The LBBB group showed the highest incidence of primary endpoint followed by NICD, RBBB, and narrow QRS groups (52.5% vs. 49.7% vs. 44.4% vs. 37.5%, p<0.001). In a multivariable Cox-proportional hazards regression analysis, LBBB and NICD were associated with 39% and 28% increased risk for primary endpoint (LBBB hazard ratio [HR], 1.392; 95% confidence interval [CI], 1.152–1.681; NICD HR, 1.278; 95% CI, 1.074–1.520) compared with narrow QRS group. The HR of RBBB for the primary endpoint was 1.103 (95% CI, 0.915–1.329).

Conclusions

LBBB and NICD were independently associated with an increased risk of 1-year adverse event in hospitalized patients with HF, whereas the prognostic impacts of RBBB were limited.

Trial Registration

ClinicalTrials.gov Identifier: NCT01389843

Copyright © 2019. Korean Association of Medical Journal Editors.