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Nakazawa N, Ishizu T, Sairenchi T, Yamagishi K, Murakoshi N, Nakagawa D, Nakatsukasa T, Kawamatsu N, Sato K, Yamamoto M, Machino-Otsuka T, Xu D, Irie F, Tomizawa T, Nogami A, Aonuma K, Iso H, Ieda M, Kawakami Y, Ota H. Right bundle branch block and risk of cardiovascular mortality: the Ibaraki Prefectural Health Study. Heart Vessels 2021; 37:609-618. [PMID: 34562143 DOI: 10.1007/s00380-021-01944-6] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/29/2021] [Accepted: 09/10/2021] [Indexed: 10/20/2022]
Abstract
Historically, a right bundle branch block has been considered a benign finding in asymptomatic individuals. However, this conclusion is based on a few old studies with small sample sizes. We examined the association between a complete right bundle branch block (CRBBB) and subsequent cardiovascular mortality in the general population in Japan. In this large community-based cohort study, data of 90,022 individuals (mean age, 58.5 ± 10.2 years; 66.2% women) who participated in annual community-based health check-ups were assessed. Subjects were followed up from 1993 to the end of 2016. Cox proportional hazards' models and log-rank tests were used for the data analysis. CRBBB was documented in 1,344 participants (1.5%). Among all included participants, CRBBB was associated with an increased risk of cardiovascular mortality after adjustment for all potential confounders (hazard ratio [HR] 1.21; 95% confidence interval [CI] 1.06-1.38). The increased risk of cardiovascular mortality was particularly evident in women aged < 65 years (HR 2.00; 95% CI 1.34-2.98) and men aged ≥ 65 years (HR 1.28; 95% CI 1.06-1.55). CRBBB is associated with an increased risk of cardiovascular mortality in women aged < 65 years and men aged ≥ 65 years. Clinicians should be aware of the presence of CRBBB in young women and elderly men, even if they exhibit no symptoms.
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Affiliation(s)
- Naomi Nakazawa
- Department of Clinical Laboratory Medicine, University of Tsukuba, Tsukuba, Japan.,Department of Cardiology, Faculty of Medicine, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, 305-8575, Japan.,Ibaraki Health Plaza, Ibaraki Health Service Association, Mito, Japan
| | - Tomoko Ishizu
- Department of Cardiology, Faculty of Medicine, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, 305-8575, Japan. .,Ibaraki Health Plaza, Ibaraki Health Service Association, Mito, Japan.
| | - Toshimi Sairenchi
- Ibaraki Health Plaza, Ibaraki Health Service Association, Mito, Japan.,Center for Research Collaboration and Support, Comprehensive Research Facilities for Advanced Medical Science, Dokkyo Medical University, Mibu, Japan
| | - Kazumasa Yamagishi
- Department of Public Health Medicine, University of Tsukuba, Tsukuba, Japan
| | - Nobuyuki Murakoshi
- Department of Cardiology, Faculty of Medicine, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, 305-8575, Japan
| | - Daishi Nakagawa
- Department of Cardiology, Faculty of Medicine, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, 305-8575, Japan
| | - Tomofumi Nakatsukasa
- Department of Cardiology, Faculty of Medicine, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, 305-8575, Japan
| | - Naoto Kawamatsu
- Department of Cardiology, Faculty of Medicine, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, 305-8575, Japan
| | - Kimi Sato
- Department of Cardiology, Faculty of Medicine, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, 305-8575, Japan
| | - Masayoshi Yamamoto
- Department of Cardiology, Faculty of Medicine, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, 305-8575, Japan
| | - Tomoko Machino-Otsuka
- Department of Cardiology, Faculty of Medicine, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, 305-8575, Japan
| | - DongZhu Xu
- Department of Cardiology, Faculty of Medicine, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, 305-8575, Japan
| | - Fujiko Irie
- Department of Health and Welfare, Ibaraki Prefectural Office, Mito, Japan
| | | | - Akihiko Nogami
- Department of Cardiology, Faculty of Medicine, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, 305-8575, Japan
| | - Kazutaka Aonuma
- Department of Cardiology, Faculty of Medicine, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, 305-8575, Japan
| | - Hiroyasu Iso
- Department of Social and Environmental Medicine, Osaka University, Osaka, Japan
| | - Masaki Ieda
- Department of Cardiology, Faculty of Medicine, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, 305-8575, Japan
| | - Yasushi Kawakami
- Department of Clinical Laboratory Medicine, University of Tsukuba, Tsukuba, Japan
| | - Hitoshi Ota
- Ibaraki Health Plaza, Ibaraki Health Service Association, Mito, Japan
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