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Defilippi C, Shah SJ, Alemayehu W, Lam CSP, Butler J, Reimann S, O'Connor CM, Shah P, Westerhout CM, Armstrong PW. Targeted discovery proteomics to identify clinical phenotypes in heart failure with preserved ejection fraction: a proteomics substudy of VITALITY-HFpEF. Eur Heart J 2022. [DOI: 10.1093/eurheartj/ehac544.781] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Abstract
Background
Heart failure with preserved ejection fraction (HFpEF) is a heterogenous syndrome that may emerge from overlapping systemic processes associated with several medical co-morbidities, often within an inflammatory milieu. Identification of unique proteins associated with distinct phenotypes may yield insight into novel therapeutics.
Purpose
Determine if unique clusters of circulating proteins are associated with specific clinical characteristics in patients with HFpEF.
Methods
A targeted discovery proteomics approach with 358 unique proteins associated with cardiovascular disease and inflammation (Olink) was used at baseline in VITALITY-HFpEF among 789 participants with documented left ventricular EF ≥45% and recent decompensation (<6 mos). Proteins were clustered applying the weighted correlation network analysis (WCNA). The associations of the clinical characteristics and frailty and clusters were estimated with linear regression adjusted for age and eGFR. Frailty was characterized as normal, pre-frail, and frail using the Fried criteria. KCCQ was the primary and 6-minute walk distance (6MWD) the secondary endpoint of VITALITY-HFpEF.
Results
Four unique clusters were identified containing 24, 66, 197, and 81 proteins, respectively. Figure 1 shows the adjusted association of the 4 protein clusters, shown with their hub proteins, with the clinical characteristics. The color (red: positive, green: negative relationship) and intensity indicate the magnitude of the standardized difference (relative to the variation [i.e., T-value]); p-value shown in boxes. Cluster 3, with tumor necrosis factor receptor 1 as a hub protein that mediates apoptosis and inflammation, was associated with greater frailty and physical limitation along with shorter 6MWD. In contrast, cluster 4, with protein C as a hub protein that regulates anticoagulation and exerts a protective function on endothelial cells, is associated with less frailty and younger age, and more frequently male sex. Cluster 2 was associated with only younger age and cluster 1 with no clinical characteristics.
Conclusions
Proteomics appear to identify specific clinical phenotypes associated with HFpEF. Further exploration of this approach may provide insight into the diverse pathophysiology characterizing this disorder and a more targeted approach to therapy.
Funding Acknowledgement
Type of funding sources: Private company. Main funding source(s): VITALITY-HFpEF was funded by Merck Sharp & Dohme Corp., a subsidiary of Merck & Co., Inc., Kenilworth, NJ, USA and Bayer AG, Wuppertal, Germany.
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Affiliation(s)
- C Defilippi
- Inova Heart and Vascular Institute , Falls Church , United States of America
| | - S J Shah
- Northwestern University , Chicago , United States of America
| | - W Alemayehu
- University of Alberta, Canadian VIGOUR Centre , Edmonton , Canada
| | - C S P Lam
- National University Heart Centre, Duke-NUS , Singapore , Singapore
| | - J Butler
- Baylor University Medical Center , Dallas , United States of America
| | | | - C M O'Connor
- Inova Heart and Vascular Institute , Falls Church , United States of America
| | - P Shah
- Inova Heart and Vascular Institute , Falls Church , United States of America
| | - C M Westerhout
- University of Alberta, Canadian VIGOUR Centre , Edmonton , Canada
| | - P W Armstrong
- University of Alberta, Canadian VIGOUR Centre , Edmonton , Canada
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2
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Tsutsui H, Lam CSP, Zhang J, Godoy-Palomino A, Tziakas D, Cohen-Solal A, Freitas C, Patel MJ, Ezekowitz JA, Hernandez AF, Pieske B, O'Connor CM, Westerhout CM, Alemayehu W, Armstrong PW. Geographic variation in heart failure with reduced ejection fraction: insights from the VICTORIA trial. Eur Heart J 2022. [DOI: 10.1093/eurheartj/ehac544.835] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Abstract
Background
Geographic differences and background therapy have not been explored in the global VICTORIA trial, which enrolled high-risk patients with recent worsening heart failure with reduced ejection fraction (HFrEF).
Methods and results
Among 5050 patients enrolled in 5 pre-specified geographic regions, 34% were from Eastern Europe, 18% Western Europe, 23% Asia Pacific, 14% Latin and South America, and 11% North America (Table 1). Patients from Western Europe were older, had more atrial fibrillation, and lower glomerular filtration rates. Patients from Eastern Europe had more coronary artery disease and exhibited more advanced symptoms (∼50% New York Heart Association [NYHA] class III), whereas those from Latin and South America were less symptomatic (∼70% NYHA class II). North American patients had the largest body mass index as well as more diabetes and hypertension. Levels of NT-proBNP at randomization and MAGGIC risk scores were highest in Western European patients. Evidence-based triple medication therapy was used most frequently in Latin and South America and less frequently in North America; conversely, cardiac resynchronization therapy and implantable cardioverter defibrillators were most frequently used in North America and least frequently in Latin and South America. The overall primary composite event rate (cardiovascular death or HF hospitalization) in the placebo arm was 36.6/100 person-years over a median of 10.8 months and after adjusting for the MAGGIC score. When examined by region, these event rates were nominally highest in North America and lowest in Western Europe.
Conclusion
Substantial regional differences exist in characteristics and treatments among patients in this global trial of patients with HFrEF and a recent worsening event. These findings demonstrate the continuing unmet needs and opportunities for enhancing care in HFrEF.
Funding Acknowledgement
Type of funding sources: Private company. Main funding source(s): VICTORIA was funded by Merck Sharp & Dohme Corp., a subsidiary of Merck & Co., Inc., Kenilworth, NJ, USA and Bayer AG, Wuppertal, Germany.
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Affiliation(s)
- H Tsutsui
- Kyushu University Graduate School of Medical Sciences , Fukuoka , Japan
| | - C S P Lam
- National Heart Centre Singapore, Duke-NUS , Singapore , Singapore
| | - J Zhang
- Fuwai Hospital Chinese Academy of Medical Sciences , Beijing , China
| | | | - D Tziakas
- Democritus University of Thrace , Alexandroupolis , Greece
| | | | | | - M J Patel
- Merck & Co., Inc. , Kenilworth , United States of America
| | - J A Ezekowitz
- University of Alberta, Canadian VIGOUR Centre , Edmonton , Canada
| | - A F Hernandez
- Duke Clinical Research Institute, Duke University School of Medicine , Durham , United States of America
| | - B Pieske
- Charité - University Medicine Berlin , Berlin , Germany
| | - C M O'Connor
- Inova Heart and Vascular Institute , Falls Church , United States of America
| | - C M Westerhout
- University of Alberta, Canadian VIGOUR Centre , Edmonton , Canada
| | - W Alemayehu
- University of Alberta, Canadian VIGOUR Centre , Edmonton , Canada
| | - P W Armstrong
- University of Alberta, Canadian VIGOUR Centre , Edmonton , Canada
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Ren QW, Teng THK, Wang T, Tse YK, Wong PF, Li HL, Yu SY, Wu MZ, Li XL, Tse HF, Lam CSP, Yiu KH. Incidence, clinical correlates and associated outcomes of dementia in heart failure: a population-based cohort study. Eur Heart J 2022. [DOI: 10.1093/eurheartj/ehab849.046] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Abstract
Funding Acknowledgements
Type of funding sources: None.
Background
Dementia, in the setting of heart failure (HF), portends poorer outcomes and poses great challenges in its clinical management.
Purpose
We investigated the incidence, types, clinical correlates, and the prognostic impact of dementia in a population-based cohort of patients with HF. Further, we examined the interactions of age and sex, and education status with dementia incidence.
Methods
The previously validated Hong Kong Clinical Data Analysis Reporting System (CDARS), a territory-wide database was interrogated to identify patients with HF (N= 202,121) from 1995 to 2018. Associations of clinical correlates with incident dementia and its risk with all-cause mortality were assessed using competing risk/multivariable Cox regression models where appropriate.
Results
Among a total cohort aged ≥18 years with HF (mean age: 75.3 ± 13.0 years, 51.3% women), new-onset dementia occurred in 22,145 (11.0%) over a median follow-up of 5.5 years. Alzheimer’s disease occurred in 27.0%; vascular dementia (18.1%) and unspecified dementia (in 55.1%). Age-standardized rate of dementia incidence in women was 1297 (95%CI, 1276-1318) (vs. 744, 95%CI, 723-765) per 10000 population in men. Other independent predictors of dementia include: Increasing age (HR 1.08), Female sex (HR 1.19), Nil/< primary (vs tertiary) education (HR 1.29), Parkinson’s disease (HR 1.73), head injury (HR 1.37), peripheral vascular disease (HR 1.31), stroke (HR 1.29), depression (HR 1.18), alcohol intake (HR1.17), anaemia (HR 1.14), hypertension (HR 1.08), among other common comorbidities in HF (Figure 1A).
Notably, a significant interaction (p < 0.001) between age and sex on dementia incidence was observed, such that women in all age groups were observed to have higher sHR compared to men (Figure 1B). After accounting for competing risk, dementia was not associated with adjusted hazard of all-cause mortality.
Conclusions
Female sex, lower socioeconomic status, increasing age and common comorbidities were associated with higher hazards of incident dementia. Abstract Figure 1A and Figure 1B
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Affiliation(s)
- Q W Ren
- The University of Hong Kong, Hong Kong, China
| | - T H K Teng
- National Heart Centre Singapore, Singapore, Singapore
| | - T Wang
- National Heart Centre Singapore, Singapore, Singapore
| | - Y K Tse
- The University of Hong Kong, Hong Kong, China
| | - P F Wong
- The University of Hong Kong, Hong Kong, China
| | - H L Li
- The University of Hong Kong, Hong Kong, China
| | - S Y Yu
- The University of Hong Kong, Hong Kong, China
| | - M Z Wu
- The University of Hong Kong, Hong Kong, China
| | - X L Li
- Nanjing Medical University, Nanjing, China
| | - H F Tse
- The University of Hong Kong, Hong Kong, China
| | - C S P Lam
- National Heart Centre Singapore, Singapore, Singapore
| | - K H Yiu
- The University of Hong Kong, Hong Kong, China
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Wang JW, Chong SY, Zharkova O, Yatim SMJM, Wang X, Lim XC, Huang C, Tan CY, Jiang J, Versteeg HH, Dewerchin M, Carmeliet P, Lam CSP, Chan MY. Tissue factor cytoplasmic domain exacerbates post-infarct left ventricular remodeling via orchestrating cardiac inflammation and angiogenesis. Eur Heart J 2021. [DOI: 10.1093/eurheartj/ehab724.3249] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Abstract
Introduction
The coagulation protein tissue factor (TF) regulates inflammation and angiogenesis via its cytoplasmic domain in infection, cancer and diabetes. While TF is highly abundant in the heart and implicated in cardiac injuries and dysfunction, the contribution of its cytoplasmic domain in cardiac pathology remains unclear.
Purpose
We aimed to investigate the contribution of the cytoplasmic domain of TF to post-infarct myocardial injury and adverse left ventricular (LV) remodeling.
Methods and results
Myocardial infarction was induced by permanent occlusion of the left anterior descending coronary artery. Male mice with C57BL/Jax background were used for the study. Compared with wild-type mice, mice lacking the TF cytoplasmic domain (TFΔCT) had a higher survival rate (90.5% versus 70%, p=0.0298) during a 28-day follow-up after myocardial infarction. Among surviving mice, TFΔCT mice had better cardiac function and less LV remodeling (ESV: 114.5±13.1mL for WT, 67.06±10.8mL for TFΔCT, p<0.001; EDV: 146.6±12.4mL for WT, 99.97±11.71mL for TFΔCT, p<0.001) than wild-type mice. Bone marrow chimerism indicated that deletion of the TF cytoplasmic domain in either bone marrow-derived cells or cardiac resident cells could alleviate post-infarct cardiac dysfunction. Speckle-tracking strain analysis revealed that the overall improvement of post-infarct cardiac performance in TFΔCT mice was attributed to reduced myocardial deformation in the peri-infarct region (strain-%: 11.14±0.97 for WT, 15.34±1.10 for TFΔCT, p=0.007; strain rate-/s: 3.89±0.26 for WT, 5.18±0.21 for TFΔCT, p=0.0005). Histological analysis demonstrated that TFΔCT hearts had in the infarct area greater proliferation of endothelial cells and myofibroblasts accompanied with better scar formation. Compared with wild-type hearts, infarcted TFΔCT hearts showed less infiltration of proinflammatory cells with concomitant lower expression of protease-activated receptor-1 (PAR1)-Rac1 axis. Furthermore, infarcted TFΔCT hearts presented markedly higher peri-infarct vessel density associated with enhanced endothelial cell proliferation and higher expression of PAR2 and PAR2-associated pro-angiogenic pathway factors.
Conclusions
Our findings demonstrate that the TF cytoplasmic domain exacerbates post-infarct cardiac injury and adverse LV remodeling via differential regulation of inflammation and angiogenesis. Targeted inhibition of the TF cytoplasmic domain-mediated intracellular signaling may ameliorate post-infarct LV remodeling without perturbing coagulation.
Funding Acknowledgement
Type of funding sources: Public Institution(s). Main funding source(s): National University Health System of Singapore
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Affiliation(s)
- J W Wang
- National University of Singapore, Department of Surgery, Cardiovascular Research Institute (CVRI), Singapore, Singapore
| | - S Y Chong
- National University of Singapore, Department of Surgery, Cardiovascular Research Institute (CVRI), Singapore, Singapore
| | - O Zharkova
- National University of Singapore, Department of Surgery, Cardiovascular Research Institute (CVRI), Singapore, Singapore
| | | | - X Wang
- National University of Singapore, Department of Surgery, Cardiovascular Research Institute (CVRI), Singapore, Singapore
| | - X C Lim
- National University of Singapore, Department of Surgery, Cardiovascular Research Institute (CVRI), Singapore, Singapore
| | - C Huang
- National University of Singapore, Department of Surgery, Cardiovascular Research Institute (CVRI), Singapore, Singapore
| | - C Y Tan
- National University of Singapore, Biochemistry, Singapore, Singapore
| | - J Jiang
- National University of Singapore, Biochemistry, Singapore, Singapore
| | - H H Versteeg
- Leiden University Medical Center, Einthoven Laboratory for Experimental Vascular Medicine, Leiden, Netherlands (The)
| | - M Dewerchin
- KU Leuven, Department of Oncology and Leuven Cancer Institute (LKI), Leuven, Belgium
| | - P Carmeliet
- KU Leuven, Department of Oncology and Leuven Cancer Institute (LKI), Leuven, Belgium
| | - C S P Lam
- National Heart Centre Singapore, Singapore, Singapore
| | - M Y Chan
- National University of Singapore, Department of Medicine and Cardiovascular Research Institute, Singapore, Singapore
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5
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Jin X, Hummel YM, Tay WT, Nauta JF, Bamadhaj NSS, van Melle JP, Lam CSP, Voors AA, Hoendermis ES. Short- and long-term haemodynamic consequences of transcatheter closure of atrial septal defect and patent foramen ovale. Neth Heart J 2021; 29:402-408. [PMID: 33594591 PMCID: PMC8271075 DOI: 10.1007/s12471-021-01543-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 01/25/2021] [Indexed: 11/30/2022] Open
Abstract
BACKGROUND Transcatheter atrial septal defect (ASD) and patent foramen ovale (PFO) closure might have opposite short- and long-term haemodynamic consequences compared with restricted interatrial shunt creation, which recently emerged as a potential treatment modality for patients with heart failure with preserved ejection fraction (HFpEF). Given the opposing approaches of ASD and PFO closure versus shunt creation, we investigated the early and sustained cardiac structural and functional changes following transcatheter ASD or PFO closure. METHODS In this retrospective study, adult secundum-type ASD and PFO patients with complete echocardiography examinations at baseline and at 1‑day and 1‑year follow-up who also underwent transcatheter closure between 2013 and 2017 at the University Medical Centre Groningen, the Netherlands were included. RESULTS Thirty-nine patients (mean age 48 ± standard deviation 16 years, 61.5% women) were included. Transcatheter ASD/PFO closure resulted in an early and persistent decrease in right ventricular systolic and diastolic function. Additionally, transcatheter ASD/PFO closure resulted in an early and sustained favourable response of left ventricular (LV) systolic function, but also in deterioration of LV diastolic function with an increase in LV filling pressure (LVFP), as assessed by echocardiography. Age (β = 0.31, p = 0.009) and atrial fibrillation (AF; β = 0.24, p = 0.03) were associated with a sustained increase in LVFP after transcatheter ASD/PFO closure estimated by mean E/e' ratio (i.e. ratio of mitral peak velocity of early filling to diastolic mitral annular velocity). In subgroup analysis, this was similar for ASD and PFO closure. CONCLUSION Older patients and patients with AF were predisposed to sustained increases in left-sided filling pressures resembling HFpEF following ASD or PFO closure. Consequently, these findings support the current concept that creating a restricted interatrial shunt might be beneficial, particularly in elderly HFpEF patients with AF.
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Affiliation(s)
- X Jin
- National Heart Centre Singapore, Singapore, Singapore.,Department of Cardiology, University of Groningen, University Medical Centre Groningen, Groningen, The Netherlands
| | - Y M Hummel
- Department of Cardiology, University of Groningen, University Medical Centre Groningen, Groningen, The Netherlands
| | - W T Tay
- National Heart Centre Singapore, Singapore, Singapore
| | - J F Nauta
- Department of Cardiology, University of Groningen, University Medical Centre Groningen, Groningen, The Netherlands
| | | | - J P van Melle
- Department of Cardiology, University of Groningen, University Medical Centre Groningen, Groningen, The Netherlands
| | - C S P Lam
- National Heart Centre Singapore, Singapore, Singapore.,Department of Cardiology, University of Groningen, University Medical Centre Groningen, Groningen, The Netherlands.,Duke-NUS Medical School, Singapore, Singapore
| | - A A Voors
- Department of Cardiology, University of Groningen, University Medical Centre Groningen, Groningen, The Netherlands
| | - E S Hoendermis
- Department of Cardiology, University of Groningen, University Medical Centre Groningen, Groningen, The Netherlands.
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Jin X, Melle JV, Voors AA, Sim DKL, Jaufeerally FR, Lee SSG, Soon D, Loh SY, Ding ZP, Richard MA, Lam CSP, Ling LH. Left atrial function in heart failure with preserved ejection fraction vs. aortic stenosis: evidence for atrial myopathy? Eur Heart J Cardiovasc Imaging 2021. [DOI: 10.1093/ehjci/jeaa356.049] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Abstract
Funding Acknowledgements
Type of funding sources: None.
Background and Aim
Left atrial (LA) enlargement and impaired LA function are frequently found in patients with heart failure with preserved ejection fraction (HFpEF). Whether these structural and functional LA abnormalities are a consequence of increased LA pressure or whether HFpEF patients have an intrinsic LA myopathy is unknown. We compared LA pressure, size and function between patients with HFpEF and aortic stenosis, as a comparator with LA pressure overload, as well as community-dwelling control subjects.
Methods
Extensive echocardiographic assessments were performed in 219 patients with HFpEF (age 68 ± 11, 48% female), 173 patients with moderate to severe AS (age 69 ± 11, 55% female, aortic valve area index 0.55 ± 0.15 cm2/m2), and 219 controls (age 65 ± 9, 48% female, 42.2% hypertensive)
Results
Compared to controls, both patients with HFpEF and AS had larger LV and LA size and worse LV systolic, diastolic and LA function. Compared with AS patients, HFpEF patients had smaller LA volume index (40.2 ± 19.4 vs. 44.5 ± 11.9 ml/m2 p = 0.01) but similar LV filling pressure estimated by E/e’ (13.4 ± 4.8 13.4 ± 4.8 , p = 0.12). Despite smaller LA volume index and similar LV filling pressure, HFpEF patients had remarkably poorer LA function compared to AS [reservoir GLS, 22.6 ± 10% vs 31.4 ± 10.1 (p < 0.001); contractile GLS, 15.8 ± 6.1% vs 17.5 ± 6.9 (p < 0.05); LASrs, 0.92 ± 0.35% vs 1.27 ± 0.41 (p < 0.001); LASre, -1.49 ± 0.65 vs -1.86 ± 0.67 (p < 0.001)]. The differences in LA reservoir GLS and LASrs remained significant after adjustment for atrial fibrillation, diabetes, coronary artery disease, LV ejection fraction and LV mass index.
Conclusion
Patients with HFpEF had significantly worse LA function than patients with AS, despite similar LA pressure overload. These findings support the concept of an intrinsic LA myopathy in patients with HFpEF, beyond LA pressure overload.
Abstract Figure.
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Affiliation(s)
- X Jin
- National Heart Centre Singapore, Singapore, Singapore
| | - JV Melle
- University Medical Center Groningen, Groningen, Netherlands (The)
| | - AA Voors
- University Medical Center Groningen, Groningen, Netherlands (The)
| | - DKL Sim
- National University Heart Centre, Singapore, Singapore
| | | | - SSG Lee
- Changi General Hospital, Singapore, Singapore
| | - D Soon
- Khoo Teck Puat Hospital, Singapore, Singapore
| | - SY Loh
- Tan Tock Seng Hospital, Singapore, Singapore
| | - ZP Ding
- National Heart Centre Singapore, Singapore, Singapore
| | - MA Richard
- National University Heart Centre, Singapore, Singapore
| | - CSP Lam
- National Heart Centre Singapore, Singapore, Singapore
| | - LH Ling
- National University Heart Centre, Singapore, Singapore
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Sng G, Lim DYZ, Sia CH, Lee JSW, Shen XY, Lee ECY, Dalakoti M, Wang KJ, Kwan CKW, Chow WE, Tan RS, Lam CSP, Chua T, Yeo TJ, Chong DTT. P1925Machine learning versus classic electrocardiographic criteria for left ventricular hypertrophy in a young pre-participation cohort: results from the SAFE protocol study. Eur Heart J 2019. [DOI: 10.1093/eurheartj/ehz748.0672] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Abstract
Background/Introduction
Classic electrocardiographic (ECG) criteria for left ventricular hypertrophy (LVH) have been well studied in Western populations, particularly in hypertensive patients. However, their utility in Asian populations is not well studied, and their applicability to young pre-participation cohorts is unclear. We sought to evaluate the performance of classical criteria against that of machine learning models.
Aims
We sought to evaluate the performance of classical criteria against the performance of novel machine learning models in the identification of LVH.
Methodology
Between November 2009 and December 2014, pre-participation screening ECG and subsequent echocardiographic data was collected from 13,954 males aged 16 to 22, who reported for medical screening prior to military conscription.
Final diagnosis of LVH was made on echocardiography, with LVH defined as a left ventricular mass index >115g/m2. The continuous and binary forms of classical criteria were compared against machine learning models using receiver-operating characteristics (ROC) curve analysis. An 80:20 split was used to divide the data into training and test sets for the machine learning models, and three fold cross validation was used in training the models. We also compared the important variables identified by machine learning models with the input variables of classical criteria.
Results
Prevalence of echocardiographic LVH in this population was 0.91% (127 cases). Classical ECG criteria had poor performance in predicting LVH, with the best predictions achieved by the continuous Sokolow-Lyon (AUC = 0.63, 95% CI = 0.58–0.68) and the continuous Modified Cornell (AUC = 0.63, 95% CI = 0.58–0.68). Machine learning methods achieved superior performance – Random Forest (AUC = 0.74, 95% CI = 0.66–0.82), Gradient Boosting Machines (AUC = 0.70, 95% CI = 0.61–0.79), GLMNet (AUC = 0.78, 95% CI = 0.70–0.86). Novel and less recognized ECG parameters identified by the machine learning models as being predictive of LVH included mean QT interval, mean QRS interval, R in V4, and R in I.
ROC curves of models studies
Conclusion
The prevalence of LVH in our population is lower than that previously reported in other similar populations. Classical ECG criteria perform poorly in this context. Machine learning methods show superior predictive performance and demonstrate non-traditional predictors of LVH from ECG data. Further research is required to improve the predictive ability of machine learning models, and to understand the underlying pathology of the novel ECG predictors identified.
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Affiliation(s)
- G Sng
- Singapore Armed Forces Medical Corps, Singapore, Singapore
| | - D Y Z Lim
- Singapore Armed Forces Medical Corps, Singapore, Singapore
| | - C H Sia
- Singapore Armed Forces Medical Corps, Singapore, Singapore
| | - J S W Lee
- Singapore Armed Forces Medical Corps, Singapore, Singapore
| | - X Y Shen
- Singapore Armed Forces Medical Corps, Singapore, Singapore
| | - E C Y Lee
- Singapore Armed Forces Medical Corps, Singapore, Singapore
| | - M Dalakoti
- Singapore Armed Forces Medical Corps, Singapore, Singapore
| | - K J Wang
- Singapore Armed Forces Medical Corps, Singapore, Singapore
| | - C K W Kwan
- Singapore Armed Forces Medical Corps, Singapore, Singapore
| | - W E Chow
- Singapore Armed Forces Medical Corps, Singapore, Singapore
| | - R S Tan
- National Heart Centre Singapore, Singapore, Singapore
| | - C S P Lam
- National Heart Centre Singapore, Singapore, Singapore
| | - T Chua
- National Heart Centre Singapore, Singapore, Singapore
| | - T J Yeo
- National University Heart Centre, Singapore, Singapore
| | - D T T Chong
- National Heart Centre Singapore, Singapore, Singapore
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8
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Yap J, Ng YX, Yeo KK, Lam CSP, Sahlen A, Lee V, Ma S. 2397Air pollution and mortality in the tropics. Eur Heart J 2018. [DOI: 10.1093/eurheartj/ehy565.2397] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Affiliation(s)
- J Yap
- National Heart Centre Singapore (NHCS), Singapore, Singapore
| | - Y X Ng
- Ministry of Health, Public Health Group, Singapore, Singapore
| | - K K Yeo
- National Heart Centre Singapore (NHCS), Singapore, Singapore
| | - C S P Lam
- National Heart Centre Singapore (NHCS), Singapore, Singapore
| | - A Sahlen
- National Heart Centre Singapore (NHCS), Singapore, Singapore
| | - V Lee
- Ministry of Health, Public Health Group, Singapore, Singapore
| | - S Ma
- Ministry of Health, Public Health Group, Singapore, Singapore
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Kessler EL, Wang JW, Van Stuijvenberg L, Brans MA, Aslan F, Lam CSP, Vos MA, De Kleijn DPV, Van Veen A, Fontes MSC. P122TLR2 Knockout attenuates adverse cardiac remodeling in mice subjected to chronic pressure overload. Cardiovasc Res 2018. [DOI: 10.1093/cvr/cvy060.084] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- E L Kessler
- University Medical Center Utrecht, Medical Physiology, Utrecht, Netherlands
| | - J W Wang
- National University Heart Centre, Surgery, Singapore, Singapore
| | - L Van Stuijvenberg
- University Medical Center Utrecht, Medical Physiology, Utrecht, Netherlands
| | - M A Brans
- University Medical Center Utrecht, Medical Physiology, Utrecht, Netherlands
| | - F Aslan
- University Medical Center Utrecht, Cardiology, Utrecht, Netherlands
| | - CSP Lam
- National University Heart Centre, Singapore, Singapore
| | - M A Vos
- University Medical Center Utrecht, Medical Physiology, Utrecht, Netherlands
| | - DPV De Kleijn
- University Medical Center Utrecht, Cardiology, Utrecht, Netherlands
| | - A Van Veen
- University Medical Center Utrecht, Medical Physiology, Utrecht, Netherlands
| | - MSC Fontes
- Leiden University Medical Center, Leiden, Netherlands
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10
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den Ruijter H, Pasterkamp G, Rutten FH, Lam CSP, Chi C, Tan KH, van Zonneveld AJ, Spaanderman M, de Kleijn DPV. Heart failure with preserved ejection fraction in women: the Dutch Queen of Hearts program. Neth Heart J 2015; 23:89-93. [PMID: 25614387 PMCID: PMC4315788 DOI: 10.1007/s12471-014-0613-1] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
Abstract
Heart failure (HF) poses a heavy burden on patients, their families and society. The syndrome of HF comes in two types: with reduced ejection fraction (HFrEF) and preserved ejection fraction (HFpEF). The latter is on the increase and predominantly present in women, especially the older ones. There is an urgent need for mortality-reducing drugs in HFpEF, a disease affecting around 5 % of those aged 65 years and over. HFpEF develops in patients with risk factors and comorbidities such as obesity, hypertension, diabetes, COPD, but also preeclampsia. These conditions are likely to drive microvascular disease with involvement of the coronary microvasculature, which may eventually evolve into HFpEF. Currently, the diagnosis of HFPEF relies mainly on echocardiography. There are no biomarkers that can help diagnose female microvascular disease or facilitate the diagnosis of (early stages of) HFpEF. Recently a Dutch consortium was initiated, Queen of Hearts, with support from the Netherlands Heart Foundation, with the aim to discover and validate biomarkers for diastolic dysfunction and HFpEF in women. These biomarkers come from innovative blood-derived sources such as extracellular vesicles and circulating cells. Within the Queen of Hearts consortium, we will pursue female biomarkers that have the potential for further evolution in assays with point of care capabilities. As a spin-off, the consortium will gain knowledge on gender-specific pathology of HFpEF, possibly opening up novel treatment options.
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Affiliation(s)
- H den Ruijter
- Experimental Cardiology Laboratory, University Medical Center, Utrecht, the Netherlands
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Yeo TJ, Ling LH, Lam CSP, Chong JPC, Liew OW, Richards AM, Chan MYY. Moderate endurance exercise is associated with an abnormal cardio-renal response in recreational runners. Eur Heart J 2013. [DOI: 10.1093/eurheartj/eht310.p5772] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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Lam CSP, Ho KT. Coronary artery ectasia: a ten-year experience in a tertiary hospital in Singapore. Ann Acad Med Singap 2004; 33:419-22. [PMID: 15329751] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 04/30/2023]
Abstract
INTRODUCTION Coronary artery ectasia (CAE) is a well-recognised, albeit rare, angiographic finding of abnormal coronary dilatation. To our best knowledge, its incidence has never been described in Singapore. We aimed to determine the incidence of CAE at our teaching hospital and to describe patient and angiographic characteristics. MATERIALS AND METHODS Cases were identified through a search of our hospital's computer database and all records were reviewed. RESULTS Over the 10-year study period (1992-2001), 8641 patients underwent coronary angiography. CAE was diagnosed in 104 patients, giving an incidence of 1.2%. The majority (74%) were male. The median age was 54 years (range, 25 to 79 years). Sixty-six per cent of patients were Chinese, 19% Malays, 12% Indians and 3% other races. Concomitant diabetes mellitus was present in 31%, hypertension in 58% and dyslipidaemia in 63% of patients. Co-existent obstructive coronary artery disease was present in 82% of cases. The frequency of arterial involvement was: right coronary artery (RCA), 65%; left anterior descending artery (LAD), 48%; circumflex artery (CX), 43%; and left main artery (LM), 2%. CAE affected only 1 major vessel in 62% of cases and all 3 vessels in 20%. Eighteen patients were advised to undergo bypass surgery, while percutaneous coronary intervention was recommended in 26 patients. CONCLUSIONS The incidence of ectasia was 1.2%. The majority of patients were males in their sixth decade with underlying dyslipidaemia or hypertension. CAE was associated with obstructive coronary artery disease in more than 80% of cases. The RCA was most commonly affected and most patients had single vessel involvement.
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Affiliation(s)
- C S P Lam
- Cardiac Department, The Heart Institute, National University Hospital, 5 Lower Kent Ridge Road, Singapore 119074
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Soon SR, Yong R, Chew ZH, Lee JMJ, Lam CSP. Pilot survey of the diagnosis and management of heart failure in primary care: a Singaporean perspective. Ann Acad Med Singap 2004; 33:413-8. [PMID: 15329750] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 04/30/2023]
Abstract
INTRODUCTION The diagnosis and management of congestive heart failure at the primary care level is difficult. Despite advances in medical therapy, namely angiotensin-converting enzyme inhibitors and beta-blockers, congestive heart failure remains a common cause of hospital visits. The extent to which these advances have been implemented in primary care is uncertain. We therefore sought to assess current practice patterns of primary care physicians and identify obstacles to optimal diagnosis and management of congestive heart failure in Singapore. MATERIALS AND METHODS Telephone interviews of 100 primary care physicians using structured questionnaires. RESULTS Primary care physicians diagnose congestive heart failure based on the presence of breathlessness (92.5%), lung crackles (52.5%), peripheral oedema (55.0%) and findings on chest radiography (76.8%). Only 1 in 3 mentioned raised jugular venous pressure as a useful diagnostic sign. Echocardiography was not commonly obtained (5%), mainly due to inaccessibility. While many (47.5%) were aware of the importance of angiotensin-converting enzyme inhibitors, few (16.2%) knew of the impact of beta-blockers on morbidity and mortality. Instead, diuretics were thought to be most important for prolonging survival in congestive heart failure (47.5%). The main obstacle to widespread angiotensin-converting enzyme inhibitors usage was dry cough. Patient compliance (57.5%) and cost (82.5%) were the main obstacles to optimising care. CONCLUSIONS Local primary care physicians diagnose congestive heart failure using non-specific symptoms and signs. Obstacles to optimal congestive heart failure management were identified. We hope our results will lead to strategies to improve patient care.
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Affiliation(s)
- S R Soon
- Faculty of Medicine, National University of Singapore, Singapore
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