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Mazza A, Bendini MG, Leggio M, Imberti JF, Valsecchi S, Boriani G. Clinical significance and prognostic value of right bundle branch block in permanent pacemaker patients. J Cardiovasc Med (Hagerstown) 2024; 25:551-558. [PMID: 38809231 DOI: 10.2459/jcm.0000000000001641] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/30/2024]
Abstract
AIMS In patients undergoing pacemaker implantation with no prior history of heart failure (HF), the presence of left bundle branch block (LBBB) has been identified as an independent predictor of HF-related death or hospitalization, while the prognostic significance of right bundle branch block (RBBB) remains uncertain. We aimed to assess the long-term risk of all-cause mortality in patients with a standard indication for permanent pacing and normal or moderately depressed left ventricular function when RBBB is detected at the time of implantation. METHODS We retrospectively enrolled 1348 consecutive patients who had undergone single- or dual-chamber pacemaker implantation at the study center, from January 1990 to December 2022. Patients with a left ventricular ejection fraction ≤35% or a prior diagnosis of HF were excluded. RESULTS The baseline 12-lead electrocardiogram revealed an RBBB in 241 (18%) and an LBBB in 98 (7%) patients. During a median follow-up of 65 [25th-75th percentile: 32-117] months, 704 (52%) patients died. The combined endpoint of cardiovascular death or HF hospitalization was reached by 173 (13%) patients. On multivariate analysis, RBBB was confirmed as an independent predictor of death [hazard ratio, 1.33; 95% confidence interval (CI), 1.09-1.63; P = 0.005]. However, when considering the combined endpoint of cardiovascular death and HF hospitalization, this endpoint was independently associated with LBBB (hazard ratio, 2.13; 95% CI, 1.38-3.29; P < 0.001), but not with RBBB. CONCLUSION In patients with standard pacemaker indications and normal or moderately depressed left ventricular function, the presence of basal RBBB was an independent predictor of mortality. However, it was not associated with the combined endpoint of cardiovascular death and HF hospitalization.
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Affiliation(s)
- Andrea Mazza
- Cardiology Division, S. Maria della Stella Hospital, Orvieto
| | | | - Massimo Leggio
- Clinica Salus Infirmorum, S. Filippo Neri Hospital, Rome
| | - Jacopo F Imberti
- Cardiology Division, Department of Biomedical, Metabolic and Neural Sciences, University of Modena and Reggio Emilia, Policlinico di Modena, Modena
- Clinical and Experimental Medicine PhD Program, University of Modena and Reggio Emilia
| | | | - Giuseppe Boriani
- Cardiology Division, Department of Biomedical, Metabolic and Neural Sciences, University of Modena and Reggio Emilia, Policlinico di Modena, Modena
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2
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Koirala S, Qarajeh R, Collado F. A Case of Transient Complete Heart Block During Left Heart Catheterization. Cureus 2024; 16:e62161. [PMID: 38993462 PMCID: PMC11238658 DOI: 10.7759/cureus.62161] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 06/06/2024] [Indexed: 07/13/2024] Open
Abstract
Iatrogenic complete heart blocks are rare but a reported complication of left heart catheterizations in patients with pre-existing right bundle branch blocks. We present the case of an 84-year-old male with a preexisting right bundle branch block who underwent a left heart catheterization for valve replacement evaluation. While attempting to engage the right coronary artery, the catheter instead crossed the aortic valve, causing the patient to become bradycardic to the 20s and hypotensive. The patient had a temporary transvenous pacer inserted and tolerated the rest of the procedure well. The cause of the complete heart block was thought to be due to the transient blockage of the left bundle branch due to ventricular septal irritation when the catheter crossed the aortic valve. When performing left heart angiograms in a patient with a right bundle branch block, operators should be prepared for a possible iatrogenic complete heart block.
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Affiliation(s)
- Sushant Koirala
- Internal Medicine, Rush University Medical Center, Chicago, USA
| | - Raed Qarajeh
- Medicine/Cardiology, Rush University Medical Center, Chicago, USA
| | - Fareed Collado
- Medicine/Cardiology, Rush University Medical Center, Chicago, USA
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3
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Zhao S, Deng Y, Wang Y, Yu S, Han J, Cai J, Zhang Y. Incidence and prognosis of cardiac conduction system diseases in hypertension: the STEP trial. NATURE AGING 2024; 4:483-490. [PMID: 38514823 DOI: 10.1038/s43587-024-00591-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/08/2023] [Accepted: 02/14/2024] [Indexed: 03/23/2024]
Abstract
Patients with cardiac conduction system diseases (CSD) may have increased incidence and mortality of cardiovascular events. Here we report a post hoc analysis of the Strategy of Blood Pressure Intervention in the Elderly Hypertensive Patients (STEP) randomized clinical trial (ClinicalTrials.gov number, NCT03015311) concerning the effect of intensive blood pressure (BP) control on the incidence of new-onset CSD and the prognostic implications of preexisting or new-onset CSD. The incidence of new-onset CSD was similar in the intensive (n = 205, 6.42%) and standard (n = 188, 5.94%) treatment arms. Participants with preexisting CSD had a higher risk for acute decompensated heart failure. Increased age, male sex and increased body mass index were independently associated with increased risk for new-onset CSD. Our results suggest that intensive BP control may not reduce the incidence of new-onset CSD compared with standard BP control.
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Affiliation(s)
- Song Zhao
- Department of Cardiology, Shanghai Tenth People's Hospital, Tongji University School of Medicine, Shanghai, China
| | - Yue Deng
- Hypertension Center, Fuwai Hospital, State Key Laboratory of Cardiovascular Disease, National Center for Cardiovascular Diseases, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China
| | - Yixuan Wang
- Hypertension Center, Beijing Anzhen Hospital, Capital Medical University, Beijing, China
| | - Shikai Yu
- Department of Cardiology, Shanghai Tenth People's Hospital, Tongji University School of Medicine, Shanghai, China
| | - Jun Han
- Department of Cardiology, Shanghai Tenth People's Hospital, Tongji University School of Medicine, Shanghai, China
| | - Jun Cai
- Hypertension Center, Fuwai Hospital, State Key Laboratory of Cardiovascular Disease, National Center for Cardiovascular Diseases, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China.
| | - Yi Zhang
- Department of Cardiology, Shanghai Tenth People's Hospital, Tongji University School of Medicine, Shanghai, China.
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MacLachlan H, Antonakaki A, Bhatia R, Fyazz S, Chatrath N, Androulakis E, Marawaha S, Basu J, Miles C, Dhutia H, Zaidi A, Chandra N, Sheikh N, Gati S, Malhotra A, Finocchiaro G, Sharma S, Papadakis M. Prevalence and Clinical Significance of Electrocardiographic Complete Right Bundle Branch Block in Young Individuals. Eur J Prev Cardiol 2024:zwae082. [PMID: 38412448 DOI: 10.1093/eurjpc/zwae082] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/28/2023] [Revised: 02/17/2024] [Accepted: 02/23/2024] [Indexed: 02/29/2024]
Abstract
BACKGROUND AND AIMS There is limited information on the clinical significance of complete right bundle branch block (CRBBB) in young individuals. The aim of this study was to determine the prevalence and significance of CRBBB in a large cohort of young individuals aged 14-35 years old. METHODS From 2008 to 2018, 104,369 consecutive individuals underwent a cardiovascular assessment with a health questionnaire, electrocardiogram, clinical consultation, and selective echocardiography. Follow-up was obtained via direct telephone consultations. Mean follow-up was 7.3 ± 2.7 years. RESULTS CRBBB was identified in 154 (0.1%) individuals and was more prevalent in males compared with females (0.20% vs. 0.06%; p<0.05) and in athletes compared with non-athletes (0.25% vs. 0.14%; p<0.05). CRBBB-related cardiac conditions were identified in 7 (5%) individuals (4 with atrial septal defect, 1 with Brugada syndrome, 1 with progressive cardiac conduction disease and 1 with atrial fibrillation). Pathology was more frequently identified in individuals with non-isolated CRBBB compared with individuals with isolated CRBBB (14% vs 1%; p < 0.05) and in individuals with a QRS duration of ≥130 milliseconds (ms) compared with individuals with a QRS of <130ms (10% vs 1%; p<0.05). CONCLUSION The prevalence of CRBBB in young individuals was 0.1% and was more prevalent in males and athletes. CRBBB-related conditions were identified in 5% of individuals and were more common in individuals with non-isolated CRBBB and more pronounced intraventricular conduction delay (QRS duration of ≥130ms). Secondary evaluation should be considered for young individuals with CRBBB with symptoms, concerning family history, additional electrocardiographic anomalies or significant QRS prolongation (≥130ms).
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Affiliation(s)
- H MacLachlan
- Cardiovascular Clinical Academic Group, St George's, University of London, London, UK
| | - A Antonakaki
- Cardiovascular Clinical Academic Group, St George's, University of London, London, UK
| | - R Bhatia
- Cardiovascular Clinical Academic Group, St George's, University of London, London, UK
| | - S Fyazz
- Cardiovascular Clinical Academic Group, St George's, University of London, London, UK
| | - N Chatrath
- Cardiovascular Clinical Academic Group, St George's, University of London, London, UK
| | - E Androulakis
- Cardiovascular Clinical Academic Group, St George's, University of London, London, UK
| | - S Marawaha
- Cardiovascular Clinical Academic Group, St George's, University of London, London, UK
| | - J Basu
- Cardiovascular Clinical Academic Group, St George's, University of London, London, UK
| | - C Miles
- Cardiovascular Clinical Academic Group, St George's, University of London, London, UK
| | - H Dhutia
- Department of Cardiology, Glenfield Hospital, Leicester, UK
| | - A Zaidi
- Cardiovascular Clinical Academic Group, St George's, University of London, London, UK
- Department of Cardiology, University Hospital of Wales, Cardiff, UK
| | - N Chandra
- Cardiovascular Clinical Academic Group, St George's, University of London, London, UK
- Department of Cardiology, Frimley Park Hospital, London, UK
| | - N Sheikh
- Cardiovascular Clinical Academic Group, St George's, University of London, London, UK
- Department of Cardiology, Guy's and St Thomas's Hospital, London, UK
| | - S Gati
- Cardiovascular Clinical Academic Group, St George's, University of London, London, UK
- Department of Cardiology, Royal Brompton & Harefield NHS Foundation Trust, London, UK
| | - A Malhotra
- Cardiovascular Clinical Academic Group, St George's, University of London, London, UK
- Institute of Sport, Manchester Metropolitan University and University of Manchester, Manchester, UK
| | - G Finocchiaro
- Cardiovascular Clinical Academic Group, St George's, University of London, London, UK
| | - S Sharma
- Cardiovascular Clinical Academic Group, St George's, University of London, London, UK
| | - M Papadakis
- Cardiovascular Clinical Academic Group, St George's, University of London, London, UK
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Chen Y, Deng X, Lin D, Yang P, Wu S, Wang X, Zhou H, Chen X, Wang X, Wu W, Ke K, Huang W, Tan X. Predicting 1-, 3-, 5-, and 8-year all-cause mortality in a community-dwelling older adult cohort: relevance for predictive, preventive, and personalized medicine. EPMA J 2023; 14:713-726. [PMID: 38094581 PMCID: PMC10713970 DOI: 10.1007/s13167-023-00342-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2023] [Accepted: 10/14/2023] [Indexed: 02/29/2024]
Abstract
BACKGROUND Population aging is a global public health issue involving increased prevalence of age-related diseases, and concomitant burden on medical resources and the economy. Ninety-two diseases have been identified as age-related, accounting for 51.3% of the global adult disease burden. The economic cost per capita for older people over 60 years is 10 times that of the younger population. From the aspects of predictive, preventive, and personalized medicine (PPPM), developing a risk-prediction model can help identify individuals at high risk for all-cause mortality and provide an opportunity for targeted prevention through personalized intervention at an early stage. However, there is still a lack of predictive models to help community-dwelling older adults do well in healthcare. OBJECTIVES This study aims to develop an accurate 1-, 3-, 5-, and 8-year all-cause mortality risk-prediction model by using clinical multidimensional variables, and investigate risk factors for 1-, 3-, 5-, and 8-year all-cause mortality in community-dwelling older adults to guide primary prevention. METHODS This is a two-center cohort study. Inclusion criteria: (1) community-dwelling adult, (2) resided in the districts of Chaonan or Haojiang for more than 6 months in the past 12 months, and (3) completed a health examination. Exclusion criteria: (1) age less than 60 years, (2) more than 30 incomplete variables, (3) no signed informed consent. The primary outcome of the study was all-cause mortality obtained from face-to-face interviews, telephone interviews, and the medical death database from 2012 to 2021. Finally, we enrolled 5085 community-dwelling adults, 60 years and older, who underwent routine health screening in the Chaonan and Haojiang districts, southern China, from 2012 to 2021. Of them, 3091 participants from Chaonan were recruited as the primary training and internal validation study cohort, while 1994 participants from Haojiang were recruited as the external validation cohort. A total of 95 clinical multidimensional variables, including demographics, lifestyle behaviors, symptoms, medical history, family history, physical examination, laboratory tests, and electrocardiogram (ECG) data were collected to identify candidate risk factors and characteristics. Risk factors were identified using least absolute shrinkage and selection operator (LASSO) models and multivariable Cox proportional hazards regression analysis. A nomogram predictive model for 1-, 3-, 5- and 8-year all-cause mortality was constructed. The accuracy and calibration of the nomogram prediction model were assessed using the concordance index (C-index), integrated Brier score (IBS), receiver operating characteristic (ROC), and calibration curves. The clinical validity of the model was assessed using decision curve analysis (DCA). RESULTS Nine independent risk factors for 1-, 3-, 5-, and 8-year all-cause mortality were identified, including increased age, male, alcohol status, higher daily liquor consumption, history of cancer, elevated fasting glucose, lower hemoglobin, higher heart rate, and the occurrence of heart block. The acquisition of risk factor criteria is low cost, easily obtained, convenient for clinical application, and provides new insights and targets for the development of personalized prevention and interventions for high-risk individuals. The areas under the curve (AUC) of the nomogram model were 0.767, 0.776, and 0.806, and the C-indexes were 0.765, 0.775, and 0.797, in the training, internal validation, and external validation sets, respectively. The IBS was less than 0.25, which indicates good calibration. Calibration and decision curves showed that the predicted probabilities were in good agreement with the actual probabilities and had good clinical predictive value for PPPM. CONCLUSION The personalized risk prediction model can identify individuals at high risk of all-cause mortality, help offer primary care to prevent all-cause mortality, and provide personalized medical treatment for these high-risk individuals from the PPPM perspective. Strict control of daily liquor consumption, lowering fasting glucose, raising hemoglobin, controlling heart rate, and treatment of heart block could be beneficial for improving survival in elderly populations. SUPPLEMENTARY INFORMATION The online version contains supplementary material available at 10.1007/s13167-023-00342-4.
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Affiliation(s)
- Yequn Chen
- Department of Community Monitoring, First Affiliated Hospital of Shantou University Medical College, Shantou, 515041 Guangdong China
| | - Xiulian Deng
- Department of Community Monitoring, First Affiliated Hospital of Shantou University Medical College, Shantou, 515041 Guangdong China
| | - Dong Lin
- Department of Community Monitoring, First Affiliated Hospital of Shantou University Medical College, Shantou, 515041 Guangdong China
- Centre for Precision Health, Edith Cowan University, Perth, WA 6027 Australia
| | - Peixuan Yang
- Department of Health Management Centre, First Affiliated Hospital of Shantou University Medical College, Shantou, 515041 Guangdong China
| | - Shiwan Wu
- Department of Community Monitoring, First Affiliated Hospital of Shantou University Medical College, Shantou, 515041 Guangdong China
| | - Xidong Wang
- Department of Community Monitoring, First Affiliated Hospital of Shantou University Medical College, Shantou, 515041 Guangdong China
| | - Hui Zhou
- Department of Community Monitoring, First Affiliated Hospital of Shantou University Medical College, Shantou, 515041 Guangdong China
| | - Ximin Chen
- Department of Community Monitoring, First Affiliated Hospital of Shantou University Medical College, Shantou, 515041 Guangdong China
| | - Xiaochun Wang
- Department of Community Monitoring, First Affiliated Hospital of Shantou University Medical College, Shantou, 515041 Guangdong China
| | - Weichai Wu
- Department of Community Monitoring, First Affiliated Hospital of Shantou University Medical College, Shantou, 515041 Guangdong China
| | - Kaibing Ke
- Department of Community Monitoring, First Affiliated Hospital of Shantou University Medical College, Shantou, 515041 Guangdong China
| | - Wenjia Huang
- Department of Community Monitoring, First Affiliated Hospital of Shantou University Medical College, Shantou, 515041 Guangdong China
| | - Xuerui Tan
- Clinical Research Centre, First Affiliated Hospital of Shantou University Medical College, No. 22 Xinling Road, Jinping District, Shantou, 515041 Guangdong China
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Miura K, Yagi R, Miyama H, Kimura M, Kanazawa H, Hashimoto M, Kobayashi S, Nakahara S, Ishikawa T, Taguchi I, Sano M, Sato K, Fukuda K, Deo RC, MacRae CA, Itabashi Y, Katsumata Y, Goto S. Deep learning-based model detects atrial septal defects from electrocardiography: a cross-sectional multicenter hospital-based study. EClinicalMedicine 2023; 63:102141. [PMID: 37753448 PMCID: PMC10518511 DOI: 10.1016/j.eclinm.2023.102141] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/09/2023] [Revised: 07/20/2023] [Accepted: 07/24/2023] [Indexed: 09/28/2023] Open
Abstract
Background Atrial septal defect (ASD) increases the risk of adverse cardiovascular outcomes. Despite the potential for risk mitigation through minimally invasive percutaneous closure, ASD remains underdiagnosed due to subtle symptoms and examination findings. To bridge this diagnostic gap, we propose a novel screening strategy aimed at early detection and enhanced diagnosis through the implementation of a convolutional neural network (CNN) to identify ASD from 12-lead electrocardiography (ECG). Methods ECGs were collected from patients with at least one recorded echocardiogram at 3 hospitals from 2 continents (Keio University Hospital from July 2011 to December 2020, Brigham and Women's Hospital from January 2015 to December 2020, and Dokkyo Medical University Saitama Medical Center from January 2010 and December 2021). ECGs from patients with a diagnosis of ASD were labeled as positive cases while the remainder were labeled as negative. ECGs after the closure of ASD were excluded. After randomly splitting the ECGs into 3 datasets (50% derivation, 20% validation, and 30% test) with no patient overlap, a CNN-based model was trained using the derivation datasets from 2 hospitals and was tested on held-out datasets along with an external validation on the 3rd hospital. All eligible ECGs were used for derivation and validation whereas the earliest ECG for each patient was used for the test and external validation. The discrimination of ASD was assessed by the area under the receiver operating characteristic curve (AUROC). Multiple subgroups were examined to identify any heterogeneity. Findings A total of 671,201 ECGs from 80,947 patients were collected from the 3 institutions. The AUROC for detecting ASD was 0.85-0.90 across the 3 hospitals. The subgroup analysis showed excellent performance across various characteristics Screening simulation using the model greatly increased sensitivity from 80.6% to 93.7% at specificity 33.6% when compared to using overt ECG abnormalities. Interpretation A CNN-based model using 12-lead ECG successfully identified the presence of ASD with excellent generalizability across institutions from 2 separate continents. Funding This work was supported by research grants from JST (JPMJPF2101), JSR corporation, Taiju Life Social Welfare Foundation, Kondou Kinen Medical Foundation, Research fund of Mitsukoshi health and welfare foundation, Tokai University School of Medicine Project Research and Internal Medicine Project Research, Secom Science and Technology Foundation, and Grants from AMED (JP23hma922012 and JP23ym0126813). This work was partially supported by One Brave Idea, co-funded by the American Heart Association and Verily with significant support from AstraZeneca and pillar support from Quest Diagnostics.
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Affiliation(s)
- Kotaro Miura
- Department of Cardiology, Keio University School of Medicine, Tokyo, Japan
- Institute for Integrated Sports Medicine, Keio University School of Medicine, Tokyo, Japan
| | - Ryuichiro Yagi
- Division of Cardiovascular Medicine, Department of Medicine, Brigham and Women’s Hospital, Boston, USA
- Harvard Medical School, Boston, MA, USA
| | - Hiroshi Miyama
- Department of Cardiology, Keio University School of Medicine, Tokyo, Japan
| | - Mai Kimura
- Department of Cardiology, Keio University School of Medicine, Tokyo, Japan
| | - Hideaki Kanazawa
- Department of Cardiology, Keio University School of Medicine, Tokyo, Japan
| | - Masahiro Hashimoto
- Department of Radiology, Keio University School of Medicine, Tokyo, Japan
| | - Sayuki Kobayashi
- Department of Cardiology, Dokkyo Medical University Saitama Medical Center, Saitama, Japan
| | - Shiro Nakahara
- Department of Cardiology, Dokkyo Medical University Saitama Medical Center, Saitama, Japan
| | - Tetsuya Ishikawa
- Department of Cardiology, Dokkyo Medical University Saitama Medical Center, Saitama, Japan
| | - Isao Taguchi
- Department of Cardiology, Dokkyo Medical University Saitama Medical Center, Saitama, Japan
| | - Motoaki Sano
- Department of Cardiology, Keio University School of Medicine, Tokyo, Japan
| | - Kazuki Sato
- Institute for Integrated Sports Medicine, Keio University School of Medicine, Tokyo, Japan
| | - Keiichi Fukuda
- Department of Cardiology, Keio University School of Medicine, Tokyo, Japan
| | - Rahul C. Deo
- Division of Cardiovascular Medicine, Department of Medicine, Brigham and Women’s Hospital, Boston, USA
- Harvard Medical School, Boston, MA, USA
| | - Calum A. MacRae
- Division of Cardiovascular Medicine, Department of Medicine, Brigham and Women’s Hospital, Boston, USA
- Harvard Medical School, Boston, MA, USA
| | - Yuji Itabashi
- Department of Cardiology, Dokkyo Medical University Saitama Medical Center, Saitama, Japan
| | - Yoshinori Katsumata
- Department of Cardiology, Keio University School of Medicine, Tokyo, Japan
- Institute for Integrated Sports Medicine, Keio University School of Medicine, Tokyo, Japan
| | - Shinichi Goto
- Department of Cardiology, Keio University School of Medicine, Tokyo, Japan
- Division of Cardiovascular Medicine, Department of Medicine, Brigham and Women’s Hospital, Boston, USA
- Harvard Medical School, Boston, MA, USA
- Division of General Internal Medicine & Family Medicine, Department of General and Acute Medicine, Tokai University School of Medicine, Isehara, Japan
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Lu W, Lin J, Li Y, Hu Q, Cheng C, Chen R, Dai Y, Chen K, Zhang S. Quantitative analysis reveals influencing factors to facilitate successful anodal-ring capture in left bundle branch pacing. Europace 2023; 25:euad172. [PMID: 37337705 PMCID: PMC10292952 DOI: 10.1093/europace/euad172] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2023] [Accepted: 06/12/2023] [Indexed: 06/21/2023] Open
Abstract
AIMS Left bundle branch pacing (LBBP) maintains left ventricular synchrony but induces right ventricular conduction delay (RVCD). Although anodal-ring capture (ARC) during bipolar LBBP improves RVCD, it is not achieved in all patients receiving LBBP. This study aimed to analyze the factors influencing ARC implementation. METHODS AND RESULTS Patients receiving LBBP with intraoperative ARC testing were enrolled. Electrocardiographic parameters were measured, including stimulus-to-QRS duration (stim-QRSd), stimulus-to-left/right ventricular activation time (stim-LVAT/RVAT), and V6-V1 interpeak interval. The distribution of lead-tip sites was described as the corrected longitudinal and lateral distance (longit-/lat-dist). Relative angles of the LBBP lead were measured. Echocardiography in short-axis view was used to measure the intraseptal lead length. Intergroup comparisons, correlation analysis, and stepwise logistic regression were performed. In total, 105 patients were included, among which 65 (62%) patients achieved ARC at a pacing output ≤ 5.0 V/0.5 ms (average 3.1 V/0.5 ms). Anodal-ring capture further shortened the stim-QRSd by 13.1 ± 7.5 ms. Better unipolar-ring (cathodal) threshold and R-wave sensing in LBBP-ARC group indicated the critical role of ring-septum contact in ARC. Longer corrected longit-dist and shorter corrected lat-dist of lead-tip sites were positively correlated with higher success likelihood of ARC, likely due to the greater relative angle in which the lead enters the septum and consequently the longer intraseptal lead length and better ring-septum contact. CONCLUSION This study elucidated the factors affecting the success likelihood of LBBP-ARC. These findings improve the understanding of LBBP-ARC, providing references for future research and clinical practice.
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Affiliation(s)
- Wenzhao Lu
- State Key Laboratory of Cardiovascular Disease, Arrhythmia Center, Fuwai Hospital, National Center for Cardiovascular Diseases, Chinese Academy of Medical Sciences & Peking Union Medical College, No. 167, Beilishi Road, Xicheng District, Beijing 100037, China
| | - Jinxuan Lin
- Department of Cardiovascular Diseases, The Third Affiliated Hospital of Southern Medical University, Guangzhou, China
| | - Yao Li
- State Key Laboratory of Cardiovascular Disease, Arrhythmia Center, Fuwai Hospital, National Center for Cardiovascular Diseases, Chinese Academy of Medical Sciences & Peking Union Medical College, No. 167, Beilishi Road, Xicheng District, Beijing 100037, China
| | - Qingyun Hu
- State Key Laboratory of Cardiovascular Disease, Arrhythmia Center, Fuwai Hospital, National Center for Cardiovascular Diseases, Chinese Academy of Medical Sciences & Peking Union Medical College, No. 167, Beilishi Road, Xicheng District, Beijing 100037, China
| | - Chendi Cheng
- State Key Laboratory of Cardiovascular Disease, Arrhythmia Center, Fuwai Hospital, National Center for Cardiovascular Diseases, Chinese Academy of Medical Sciences & Peking Union Medical College, No. 167, Beilishi Road, Xicheng District, Beijing 100037, China
| | - Ruohan Chen
- State Key Laboratory of Cardiovascular Disease, Arrhythmia Center, Fuwai Hospital, National Center for Cardiovascular Diseases, Chinese Academy of Medical Sciences & Peking Union Medical College, No. 167, Beilishi Road, Xicheng District, Beijing 100037, China
| | - Yan Dai
- State Key Laboratory of Cardiovascular Disease, Arrhythmia Center, Fuwai Hospital, National Center for Cardiovascular Diseases, Chinese Academy of Medical Sciences & Peking Union Medical College, No. 167, Beilishi Road, Xicheng District, Beijing 100037, China
| | - Keping Chen
- State Key Laboratory of Cardiovascular Disease, Arrhythmia Center, Fuwai Hospital, National Center for Cardiovascular Diseases, Chinese Academy of Medical Sciences & Peking Union Medical College, No. 167, Beilishi Road, Xicheng District, Beijing 100037, China
| | - Shu Zhang
- State Key Laboratory of Cardiovascular Disease, Arrhythmia Center, Fuwai Hospital, National Center for Cardiovascular Diseases, Chinese Academy of Medical Sciences & Peking Union Medical College, No. 167, Beilishi Road, Xicheng District, Beijing 100037, China
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8
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Kan C, Ye Z, Zhou H, Cheruku SR. DG-ECG: Multi-stream deep graph learning for the recognition of disease-altered patterns in electrocardiogram. Biomed Signal Process Control 2023. [DOI: 10.1016/j.bspc.2022.104388] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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9
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Wang H, Li X, Yan R, Li P, Han X. A Novel Pacing Method to Obtain Synchronous Biventricular Activation: Synchronized Pacing of Left and Right Bundle Branches. Can J Cardiol 2023; 39:14-17. [PMID: 36252905 DOI: 10.1016/j.cjca.2022.10.012] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2022] [Revised: 09/14/2022] [Accepted: 10/07/2022] [Indexed: 01/10/2023] Open
Affiliation(s)
- Haixiong Wang
- Department of Cardiology, Shanxi Cardiovascular Hospital, Taiyuan, Shanxi, China; Department of Cardiology, Xinzhou People's Hospital, Xinzhou, Shanxi, China.
| | - Xiaofang Li
- Department of Digestive Oncology, Cancer Center, Shanxi Bethune Hospital, Shanxi Academy of Medical Sciences, Tongji Shanxi Hospital, Third Hospital of Shanxi Medical University, Taiyuan, Shanxi, China
| | - Rui Yan
- Department of Cardiology, Shanxi Cardiovascular Hospital, Taiyuan, Shanxi, China
| | - Pengfei Li
- Department of Cardiology, Xinzhou People's Hospital, Xinzhou, Shanxi, China
| | - Xuebin Han
- Department of Cardiology, Shanxi Cardiovascular Hospital, Taiyuan, Shanxi, China
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Chen Z, Zhou X, Ma X, Chen K. Recruitment of the cardiac conduction system for optimal resynchronization therapy in failing heart. Front Physiol 2022; 13:1045740. [PMID: 36589433 PMCID: PMC9798297 DOI: 10.3389/fphys.2022.1045740] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2022] [Accepted: 12/02/2022] [Indexed: 12/24/2022] Open
Abstract
Heart failure (HF) is a leading health burden around the world. Although pharmacological development has dramatically advanced medication therapy in the field, hemodynamic disorders or mechanical desynchrony deteriorated by intra or interventricular conduction abnormalities remains a critical target beyond the scope of pharmacotherapy. In the past 2 decades, nonpharmacologic treatment for heart failure, such as cardiac resynchronization therapy (CRT) via biventricular pacing (BVP), has been playing an important role in improving the prognosis of heart failure. However, the response rate of BVP-CRT is variable, leaving one-third of patients not benefiting from the therapy as expected. Considering the non-physiological activation pattern of BVP-CRT, more efforts have been made to optimize resynchronization. The most extensively investigated approach is by stimulating the native conduction system, e.g., His-Purkinje conduction system pacing (CSP), including His bundle pacing (HBP) and left bundle branch area pacing (LBBAP). These emerging CRT approaches provide an alternative to traditional BVP-CRT, with multiple proof-of-concept studies indicating the safety and efficacy of its utilization in dyssynchronous heart failure. In this review, we summarize the mechanisms of dyssynchronous HF mediated by conduction disturbance, the rationale and acute effect of CSP for CRT, the recent advancement in clinical research, and possible future directions of CSP.
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Affiliation(s)
- Zhongli Chen
- State Key Laboratory of Cardiovascular Disease, Arrhythmia Center, Fuwai Hospital, National Center for Cardiovascular Diseases, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China
| | | | - Xuan Ma
- Department of Magnetic Resonance Imaging, Fuwai Hospital, National Center for Cardiovascular Diseases, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China
| | - Keping Chen
- State Key Laboratory of Cardiovascular Disease, Arrhythmia Center, Fuwai Hospital, National Center for Cardiovascular Diseases, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China,*Correspondence: Keping Chen,
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11
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Rector G, Triska J, Ajene G, Wang A, Haddadin F, Jabri A, Alam M, Birnbaum Y. Right Bundle Branch and Bifascicular Blocks: Insensitive Prognostic Indicators for Acute Myocardial Infarction. Curr Probl Cardiol 2022; 48:101418. [PMID: 36181784 DOI: 10.1016/j.cpcardiol.2022.101418] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2022] [Accepted: 09/21/2022] [Indexed: 10/14/2022]
Abstract
BACKGROUND The clinical significance of right bundle branch block (RBBB) or bifascicular block (BFB) in the setting of acute myocardial infarction (AMI) is uncertain. METHODS AND RESULTS RBBB was found in 211 of 7,626 patients (2.8%), presenting to the ED (emergency department) with chest pain, of which 18 (8.5%) also had acute coronary syndrome (ACS). Incidences of ACS were not significantly different between new or presumed new RBBB and prior known RBBB or new or presumed new BFB and prior known BFB. In two patients, baseline ST-segment depression in leads V1-3 masked anterior ST-elevation detected on electrocardiogram (ECG). CONCLUSIONS In opposition to the guidelines, the presence of RBBB or BFB does not appear to offer any clinical utility when evaluating patients with suspected AMI. Patients with suspected AMI who present with RBBB and any ST-elevation in leads V1-3 should be considered for emergent coronary angiography rather than RBBB alone.
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Affiliation(s)
- Graham Rector
- Department of Medicine, Baylor College of Medicine, Houston, Texas
| | - Jeffrey Triska
- Department of Medicine, Baylor College of Medicine, Houston, Texas.
| | - George Ajene
- Department of Medicine, Baylor College of Medicine, Houston, Texas
| | - Ann Wang
- Physician Assistant Program, Baylor College of Medicine, Houston, Texas
| | - Faris Haddadin
- Department of Medicine, Section of Cardiology, Baylor College of Medicine, Houston, Texas
| | - Ahmad Jabri
- Heart and Vascular Center, MetroHealth Medical Center, Cleveland, OH, USA
| | - Mahboob Alam
- Department of Medicine, Section of Cardiology, Baylor College of Medicine, Houston, Texas
| | - Yochai Birnbaum
- Department of Medicine, Section of Cardiology, Baylor College of Medicine, Houston, Texas
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12
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Yang Y, Wang J, Wu B, Xu Y, Tang L, Jiang H, Wang B, Zhu T. New permanent bundle-branch block and long-term prognosis of patients with new onset ST-elevation myocardial infarction who underwent percutaneous coronary intervention. Front Physiol 2022; 13:892623. [PMID: 36072847 PMCID: PMC9441698 DOI: 10.3389/fphys.2022.892623] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2022] [Accepted: 07/25/2022] [Indexed: 11/13/2022] Open
Abstract
Aim: The aim of the study was to evaluate the potential predictive value of permanent RBBB and LBBB for longer-term prognosis in patients with new-onset STEMI who underwent percutaneous coronary intervention (PCI). Methods: Patients with new-onset STEMI that underwent emergency PCI at our department from June 2012 to September 2020 were included in the study. Gensini score (GS) was employed to evaluate the severity of coronary lesions. The primary endpoint of the study was the occurrence of major adverse cardiac and cerebrovascular events (MACCEs), the composite of cardiac mortality, recurrence of myocardial infarction, cardiac shock, stroke, stent thrombosis, or revascularization. We also set all-cause mortality as a secondary endpoint. Results: Out of the 547 patients, 29 patients had new-onset permanent LBBB, 51 patients had new-onset permanent RBBB, and 467 patients had no bundle-branch block (BBB). The occurrence of no BBB, new permanent LBBB, or RBBB was not associated with the severity of coronary artery lesions as evaluated by the GS. After follow-up at an average of 43.93 months, MACCEs occurred in 52 patients. Kaplan-Meier analysis showed that patients with new-onset RBBB were at greater risk for MACCEs compared to those with new onset LBBB (χ2 = 5.107, p = 0.021). Also, an independent correlation was found between new permanent RBBB and LBBB and MACCEs risk. The adjusted hazard ratios (HRs) were 6.862 [95% confidence interval (CI) of 3.764–12.510] for the new-onset permanent RBBB and 3.395 (95% CI of 1.280–9.005) for LBBB, compared to those with no BBB, respectively (both p < 0.05). Conclusion: New onset permanent RBBB in patients with new onset STEMI who underwent PCI may be correlated independently with increased risk of poor long-term prognosis.
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Affiliation(s)
- Yi Yang
- Department of Cardiology Fourth Ward, The Xinjiang Medical University Affiliated Hospital of Traditional Chinese Medicine, Urumqi, China
- Department of Cardiology, Affiliated Hospital of Xinjiang Medical University, Urumqi, China
| | - Jun Wang
- Department of Cardiology, Urumqi, China
| | - Bing Wu
- Department of Cardiology, Renmin Hospital, Hubei University of Medicine, Shiyan, China
| | - Yanan Xu
- Respiratory Medicine, The People’s Hospital of Xuancheng City, Anhui, China
| | - Long Tang
- Department of Cardiology, Urumqi, China
| | - Haibing Jiang
- Department of Cardiology Fourth Ward, The Xinjiang Medical University Affiliated Hospital of Traditional Chinese Medicine, Urumqi, China
| | - Benfang Wang
- Department of Cardiology, The First Affiliated Hospital of Bengbu Medical College, Bengbu, China
- *Correspondence: Benfang Wang, ; Tongjian Zhu,
| | - Tongjian Zhu
- Department of Cardiology, Xiangyang Central Hospital, Affiliated Hospital of Hubei University of Arts and Science, Xiangyang, China
- *Correspondence: Benfang Wang, ; Tongjian Zhu,
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13
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Complete Right Bundle Branch Block as a Predictor of Cardiovascular Events in Type 2 Diabetes. J Clin Med 2022; 11:jcm11154618. [PMID: 35956232 PMCID: PMC9369932 DOI: 10.3390/jcm11154618] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2022] [Revised: 08/01/2022] [Accepted: 08/03/2022] [Indexed: 11/16/2022] Open
Abstract
Complete right bundle branch block (CRBBB) is generally regarded as a clinically insignificant abnormality on an electrocardiogram, although its predictive value for cardiovascular events in type 2 diabetes mellitus (T2DM) is unknown. We examined the association of CRBBB with cardiovascular events during a 6-year follow-up in a single-center cohort study. The Fine–Gray model was used to analyze the independent association between CRBBB and composite cardiovascular events including cardiovascular death, nonfatal myocardial infarction, nonfatal stroke, and hospitalization for heart failure during follow up. We analyzed the data of 370 T2DM patients including 62 patients with pre-existing heart disease. CRBBB was found in 34 patients (9.2%). The composite cardiovascular outcome was recorded in 32 patients. When analyzed with the Fine–Gray model with inverse probability of treatment weighting, CRBBB was significantly associated with a higher risk of the cardiovascular outcome (hazard ratio, 2.55; 95% confidence interval, 1.04 to 6.26; p = 0.041). This association remained significant even after further adjustment for each of the potential confounders. This study suggested that CRBBB was an independent predictor of cardiovascular events in T2DM. Further studies with a larger sample size are warranted.
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14
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Lee H, Jeon YJ, Kang BJ, Lee TY, Park EJ, Park S, Ann SH, Kim YG, Lee Y, Choi SH, Park GM. Frequency and Significance of Right Bundle Branch Block and Subclinical Coronary Atherosclerosis in Asymptomatic Individuals. Am J Cardiol 2021; 158:30-36. [PMID: 34462052 DOI: 10.1016/j.amjcard.2021.07.042] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/06/2021] [Revised: 07/14/2021] [Accepted: 07/16/2021] [Indexed: 11/17/2022]
Abstract
Limited data exist regarding the association between right bundle branch block (RBBB) and subclinical coronary atherosclerosis. This study investigated the influence of RBBB on subclinical coronary atherosclerosis detected by coronary computed tomographic angiography (CCTA) in an asymptomatic population. We retrospectively analyzed 7,205 asymptomatic individuals (mean age 54.4 ± 7.9 years and 4,695 men [65.2%]) with no prior history of coronary artery disease who voluntarily underwent CCTA and 12-lead electrocardiographic evaluation as part of a general health examination. The degree and extent of subclinical coronary atherosclerosis were evaluated by CCTA, and ≥50% diameter stenosis was defined as significant. The association between RBBB and subclinical coronary atherosclerosis was determined by logistic regression and propensity score matching analyses. Of study participants, 116 (1.6%) had RBBB. After adjustment for cardiovascular risk factors, there were no statistically significant differences in the adjusted odds ratios of RBBB for any atherosclerotic plaque (0.87, 95% confidence interval [CI] 0.57 to 1.32), calcified plaque (0.78, 95% CI 0.51 to 1.19), noncalcified plaque (1.44, 95% CI 0.77 to 2.69), mixed plaque (1.12, 95% CI 0.52 to 2.39), and significant coronary artery stenosis (0.92, 95% CI 0.48 to 1.74). Similarly, in the 5: 1 propensity score-matched population (n = 696), there were no statistically significant differences in the odds ratios for any subclinical coronary atherosclerosis between participants with and without RBBB (p for all >0.05). In conclusion, through this large cross-sectional study of asymptomatic individuals who underwent CCTA and electrocardiography evaluation, individuals with RBBB were not associated with an increased risk of subclinical coronary atherosclerosis compared with those without RBBB.
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Affiliation(s)
- Hyeji Lee
- Department Emergency Medicine, Ulsan University Hospital, University of Ulsan College of Medicine, Ulsan, Republic of Korea
| | - Young-Jee Jeon
- Department of Family Medicine, Ulsan University Hospital, University of Ulsan College of Medicine, Ulsan, Republic of Korea
| | - Byung Ju Kang
- Department of Pulmonary and Critical Care Medicine, Ulsan University Hospital, University of Ulsan College of Medicine, Ulsan, Republic of Korea
| | - Tae Young Lee
- Department of Radiology, Ulsan University Hospital, University of Ulsan College of Medicine, Ulsan, Republic of Korea
| | - Eun Ji Park
- Medical Information Center, Ulsan University Hospital, University of Ulsan College of Medicine, Ulsan, Republic of Korea
| | - Sangwoo Park
- Department of Cardiology, Ulsan University Hospital, University of Ulsan College of Medicine, Ulsan, Republic of Korea
| | - Soe Hee Ann
- Department of Cardiology, Ulsan University Hospital, University of Ulsan College of Medicine, Ulsan, Republic of Korea
| | - Yong-Giun Kim
- Department of Cardiology, Ulsan University Hospital, University of Ulsan College of Medicine, Ulsan, Republic of Korea
| | - Yongjik Lee
- Department of Thoracic and Cardiovascular Surgery, Ulsan University Hospital, University of Ulsan College of Medicine, Ulsan, Republic of Korea
| | - Seong Hoon Choi
- Department of Radiology, Ulsan University Hospital, University of Ulsan College of Medicine, Ulsan, Republic of Korea.
| | - Gyung-Min Park
- Department of Cardiology, Ulsan University Hospital, University of Ulsan College of Medicine, Ulsan, Republic of Korea.
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15
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Zhong C, Xu W, Shi S, Zhou X, Zhu Z. Left bundle branch pacing for cardiac resynchronization therapy: A systematic literature review and meta-analysis. PACING AND CLINICAL ELECTROPHYSIOLOGY: PACE 2021; 44:497-505. [PMID: 33491220 DOI: 10.1111/pace.14174] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/02/2020] [Revised: 01/05/2021] [Accepted: 01/18/2021] [Indexed: 12/23/2022]
Abstract
BACKGROUND Left bundle branch pacing (LBBP) recently has been suggested as an alternative modality to deliver cardiac resynchronization therapy (CRT). Data on LBBP for CRT are limited to small sample reports, and clinical benefits and risks have not been systematically assessed. We sought to systematically examine published studies of LBBP for CRT and quantify the feasibility and efficacy of the therapy. METHODS Cochrane Library, PubMed, Web of Science, and Embase databases were searched from inception to September 30, 2020 to identify relevant studies evaluating LBBP in patients for CRT. Clinical outcomes of interest included implant success rate, QRS duration (QRSd), pacing threshold, left ventricular (LV) function at baseline and follow-up, heart failure-related hospitalization, and mortality. Data were extracted and summarized. RESULTS A total of six studies (two single-arm studies and four comparative studies) involving 174 patients were included. The results showed that the average age of patients was 64.9 years and all were implanted for CRT. The procedural success rate was only reported in two studies (97% and 81.1%, respectively). LBBP resulted in a narrow of mean QRSd from 172.7 ± 4.8 to 115.1 ± 7.6 ms. LV function, including LV ejection fraction and LV end-diastolic dimension improved at follow-up. During a mean follow-up of 8.1 months, 1.3% of patients experienced heart failure-related hospitalization and no patients died. CONCLUSION LBBP is a feasible strategy with significant efficacy and safety for CRT candidates.
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Affiliation(s)
- Chenghao Zhong
- Department of Cardiology, The First People's Hospital of Changzhou, The Third Affiliated Hospital of Soochow University, Changzhou, China
| | - Wei Xu
- Department of Cardiology, The First People's Hospital of Changzhou, The Third Affiliated Hospital of Soochow University, Changzhou, China
| | - Shunyi Shi
- Department of Cardiology, The First People's Hospital of Changzhou, The Third Affiliated Hospital of Soochow University, Changzhou, China
| | - Xiujuan Zhou
- Department of Cardiology, The First Affiliated Hospital of Nanjing Medical University, Nanjing, China
| | - Zhenyan Zhu
- Department of Cardiology, The First People's Hospital of Changzhou, The Third Affiliated Hospital of Soochow University, Changzhou, China
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16
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Gaba P, Pedrotty D, DeSimone CV, Bonikowske AR, Allison TG, Kapa S. Mortality in Patients With Right Bundle-Branch Block in the Absence of Cardiovascular Disease. J Am Heart Assoc 2020; 9:e017430. [PMID: 32924743 PMCID: PMC7792408 DOI: 10.1161/jaha.120.017430] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
Background Right bundle-branch block (RBBB) occurs in 0.2% to 1.3% of people and is considered a benign finding. However, some studies have suggested increased risk of cardiovascular morbidity and mortality. We sought to evaluate risk attributable to incidental RBBB in patients without prior diagnosis of cardiovascular disease (CVD). Methods and Results We reviewed the Mayo Clinic Integrated Stress Center database for exercise stress tests performed from 1993 to 2010. Patients with no known CVD-defined as absence of coronary disease, structural heart disease, heart failure, or cerebrovascular disease-were selected. Only Minnesota residents were included, all of whom had full mortality and outcomes data. There were 22 806 patients without CVD identified; 220 of whom (0.96%) had RBBB, followed for 6 to 23 years (mean 12.4±5.1). There were 8256 women (36.2%), mean age was 52±11 years; and 1837 deaths (8.05%), including 645 cardiovascular-related deaths (2.83%), occurred over follow-up. RBBB was predictive of all-cause (hazard ratio [HR], 1.5; 95% CI, 1.1-2.0; P=0.0058) and cardiovascular-related mortality (HR,1.7; 95% CI, 1.1-2.8; P=0.0178) after adjusting for age, sex, diabetes mellitus, hypertension, obesity, current and past history of smoking, and use of a heart rate-lowering drug. Patients with RBBB exhibited more hypertension (34.1% versus 23.7%, P<0.0003), decreased functional aerobic capacity (82±25% versus 90±24%; P<0.0001), slower heart rate recovery (13.5±11.5 versus 17.1±9.4 bpm; P<0.0001), and more dyspnea (28.2% versus 22.4%; P<0.0399) on exercise testing. Conclusions Patients with RBBB without CVD have increased risk of all-cause mortality, cardiovascular-related mortality, and lower exercise tolerance. These data suggest RBBB may be a marker of early CVD and merit further prospective evaluation.
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Affiliation(s)
- Prakriti Gaba
- Department of Medicine Columbia University Medical Center New York NY
| | - Dawn Pedrotty
- Department of Medicine Hospital of the University of Pennsylvania Philadelphia PA
| | | | - Amanda R Bonikowske
- Department of Cardiovascular Medicine Mayo Clinic College of Medicine Rochester MN
| | - Thomas G Allison
- Department of Cardiovascular Medicine Mayo Clinic College of Medicine Rochester MN
| | - Suraj Kapa
- Department of Cardiovascular Medicine Mayo Clinic College of Medicine Rochester MN
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17
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Affiliation(s)
- Yochai Birnbaum
- The Section of CardiologyBaylor College of MedicineHoustonTX
| | - Kjell Nikus
- Faculty of Medicine and Health TechnologyTampere University and Heart CenterTampere University HospitalTampereFinland
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