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Andršová I, Hnatkova K, Toman O, Šišáková M, Smetana P, Huster KM, Barthel P, Novotný T, Schmidt G, Malik M. Intra-subject stability of different expressions of spatial QRS-T angle and their relationship to heart rate. Front Physiol 2022; 13:939633. [DOI: 10.3389/fphys.2022.939633] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2022] [Accepted: 07/18/2022] [Indexed: 11/13/2022] Open
Abstract
Three-dimensional angle between the QRS complex and T wave vectors is a known powerful cardiovascular risk predictor. Nevertheless, several physiological properties of the angle are unknown or poorly understood. These include, among others, intra-subject profiles and stability of the angle relationship to heart rate, characteristics of angle/heart-rate hysteresis, and the changes of these characteristics with different modes of QRS-T angle calculation. These characteristics were investigated in long-term 12-lead Holter recordings of 523 healthy volunteers (259 females). Three different algorithmic methods for the angle computation were based on maximal vector magnitude of QRS and T wave loops, areas under the QRS complex and T wave curvatures in orthogonal leads, and weighted integration of all QRS and T wave vectors moving around the respective 3-dimensional loops. These methods were applied to orthogonal leads derived either by a uniform conversion matrix or by singular value decomposition (SVD) of the original 12-lead ECG, giving 6 possible ways of expressing the angle. Heart rate hysteresis was assessed using the exponential decay models. All these methods were used to measure the angle in 659,313 representative waveforms of individual 10-s ECG samples and in 7,350,733 individual beats contained in the same 10-s samples. With all measurement methods, the measured angles fitted second-degree polynomial regressions to the underlying heart rate. Independent of the measurement method, the angles were found significantly narrower in females (p < 0.00001) with the differences to males between 10o and 20o, suggesting that in future risk-assessment studies, different angle dichotomies are needed for both sexes. The integrative method combined with SVD leads showed the highest intra-subject reproducibility (p < 0.00001). No reproducible delay between heart rate changes and QRS-T angle changes was found. This was interpreted as a suggestion that the measurement of QRS-T angle might offer direct assessment of cardiac autonomic responsiveness at the ventricular level.
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Heat Shock Protein 27 Levels Predict Myocardial Inhomogeneities in Hemodialysis Patients. Mediators Inflamm 2022; 2022:5618867. [PMID: 35633658 PMCID: PMC9135511 DOI: 10.1155/2022/5618867] [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: 04/18/2022] [Accepted: 05/06/2022] [Indexed: 11/25/2022] Open
Abstract
Background Sudden cardiac death (SCD) is the single major cause of death in hemodialysis (HD) patients. QRS-T angle is an established marker of global repolarization heterogeneity associated with electrical instability and SCD. Heat shock protein 27 (HSP27) plays an important, protective role against noxious factors in the cardiovascular (CV) system. This study is aimed at assessing whether low HSP27 is associated with myocardial inhomogeneities in HD patients, as expressed by increases in the spatial QRS-T angle. Methods Clinical data and biochemical, echocardiographic, and electrocardiographic parameters were evaluated in 182 HD patients. Patients were split into normal and abnormal QRS-T angle groups. Results Patients with abnormally high QRS-T angles were older and had higher prevalence of diabetes as well as myocardial infarction, higher left ventricular mass index (LVMI) and C-reactive protein, worse oxidant/antioxidant status, and lower ejection fraction and HSP27. Multiple regression analysis revealed that abnormal QRS-T values were independently, negatively associated with serum HSP27 and positively associated with LVMI. Conclusions Low HSP27 levels are associated with increased heterogeneity of myocardial action potential, as expressed by increased spatial QRS-T angle.
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Neutrophil-Lymphocyte Ratio (NLR) Reflects Myocardial Inhomogeneities in Hemodialyzed Patients. Mediators Inflamm 2020; 2020:6027405. [PMID: 32963494 PMCID: PMC7486637 DOI: 10.1155/2020/6027405] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2020] [Accepted: 08/24/2020] [Indexed: 11/17/2022] Open
Abstract
Introduction Cardiovascular diseases (CVDs) are a leading cause of death in chronically hemodialyzed (HD) patients. In this group, inflammation exerts significant impact on the prevalence of CVD morbidity and mortality. Spatial QRS-T angle is an independent and strong predictor of CV events, including sudden cardiac death (SCD), both in general population and HD patients. Pathogenesis of widened QRS-T angle is complicated and is not well established. Objectives The study is aimed at evaluating whether inflammation process can contribute to the wide QRS-T angle. Patients and Methods. The retrospective study was performed on 183 HD patients. The control group consisted of 38 patients. Demographic, biochemical, vectorcardiographic, and echocardiographic data were evaluated in all patients. Inflammation process was expressed as neutrophil-lymphocyte ratio (NLR), as well as C-reactive protein (CRP). Results Both NLR (3.40 vs. 1.95 (p < 0.0001)) and spatial QRS-T angle (50.76 vs. 93.56 (p < 0.001)) were higher in the examined group, compared to the control group. Similarly, CRP was higher in the examined group than in the control group (8.35 vs. 4.06 (p < 0.001), respectively). The QRS-T angle correlated with NLR, CRP, some structural echocardiographic parameters, parathormone (PTH), and calcium (Ca) concentrations. Multiple regression analysis showed that NLR is an independent QRS-T angle predictor (r = 0.498, p = 0.0027). The ROC curve analysis indicated the cut-off point of NLR equaled 4.59, where the sensitivity and specificity were the highest for predicting myocardial inhomogeneities expressed as widened QRS-T angle. Conclusion The NLR, as an inflammation marker, may indicate myocardial inhomogeneities in HD patients.
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Sweda R, Sabti Z, Strebel I, Kozhuharov N, Wussler D, Shrestha S, Flores D, Badertscher P, Lopez‐Ayala P, Zimmermann T, Michou E, Gualandro DM, Häberlin A, Tanner H, Keller DI, Nowak A, Pfister O, Breidthardt T, Mueller C, Reichlin T. Diagnostic and prognostic values of the QRS-T angle in patients with suspected acute decompensated heart failure. ESC Heart Fail 2020; 7:1817-1829. [PMID: 32452635 PMCID: PMC7373892 DOI: 10.1002/ehf2.12746] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2019] [Revised: 04/08/2020] [Accepted: 04/20/2020] [Indexed: 01/06/2023] Open
Abstract
AIMS The aim of this study was to investigate the diagnostic and prognostic utility of the QRS-T angle, an electrocardiogram (ECG) marker quantifying depolarization-repolarization heterogeneity, in patients with suspected acute decompensated heart failure (ADHF). METHODS AND RESULTS We prospectively enrolled unselected patients presenting to the emergency department with symptoms suggestive of ADHF. The QRS-T angle was automatically derived from a standard 12-lead ECG recorded at presentation. The primary diagnostic endpoint was a final adjudicated diagnosis of ADHF. The primary prognostic endpoint was all-cause mortality during 2 years of follow-up. Among the 1915 patients enrolled, those with higher QRS-T angles were older, were more commonly male, and had a higher rate of co-morbidities such as arterial hypertension, coronary artery disease, or chronic kidney disease. ADHF was the final adjudicated diagnosis in 1140 (60%) patients. The QRS-T angle in patients with ADHF was significantly larger than in patients with non-cardiac causes of dyspnoea {median 110° [inter-quartile range (IQR) 46-156°] vs. median 33° [IQR 15-57°], P < 0.001}. The diagnostic accuracy of the QRS-T angle as quantified by the area under the receiver operating characteristic curve (AUC) was 0.75 [95% confidence interval (CI) 0.73-0.77, P < 0.001], which was inferior to N-terminal pro-B-type natriuretic peptide (AUC 0.93, 95% CI 0.92-0.94, P < 0.001), but similar to that of high-sensitivity troponin T (AUC 0.78, 95% CI 0.76-0.80, P = 0.09). The AUC of the QRS-T angle for discrimination between ADHF and non-cardiac dyspnoea remained similarly high in subgroups of patients known to be diagnostically challenging, including patients older than 75 years [0.71 (95% CI 0.67-0.74)], renal failure [0.79 (95% CI 0.71-0.87)], and atrial fibrillation at presentation [0.68 (95% CI 0.60-0.76)]. Mortality rates according to QRS-T angle tertiles were 4%, 6%, and 10% after 30 days (P < 0.001) and 24%, 31%, and 43% after 2 years (P < 0.001). After adjustment for clinical, laboratory, and ECG parameters, the QRS-T angle remained an independent predictor for 2 year mortality with a 4% increase in mortality for every 20° increase in QRS-T angle (P = 0.02). CONCLUSIONS The QRS-T angle is a readily available and inexpensive marker that can assist in the discrimination between ADHF and non-cardiac causes of acute dyspnoea and may aid in the risk stratification of these patients.
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Affiliation(s)
- Romy Sweda
- Department of Cardiology, Inselspital, University Hospital BernUniversity of BernBernSwitzerland
- sitem Center for Translational Medicine and Biomedical EntrepreneurshipUniversity of BernBernSwitzerland
| | - Zaid Sabti
- Department of Cardiology and Cardiovascular Research Institute Basel (CRIB)University Hospital BaselBaselSwitzerland
| | - Ivo Strebel
- Department of Cardiology and Cardiovascular Research Institute Basel (CRIB)University Hospital BaselBaselSwitzerland
| | - Nikola Kozhuharov
- Department of Cardiology and Cardiovascular Research Institute Basel (CRIB)University Hospital BaselBaselSwitzerland
| | - Desiree Wussler
- Department of Cardiology and Cardiovascular Research Institute Basel (CRIB)University Hospital BaselBaselSwitzerland
| | - Samyut Shrestha
- Department of Cardiology and Cardiovascular Research Institute Basel (CRIB)University Hospital BaselBaselSwitzerland
| | - Dayana Flores
- Department of Cardiology and Cardiovascular Research Institute Basel (CRIB)University Hospital BaselBaselSwitzerland
| | - Patrick Badertscher
- Department of Cardiology and Cardiovascular Research Institute Basel (CRIB)University Hospital BaselBaselSwitzerland
| | - Pedro Lopez‐Ayala
- Department of Cardiology and Cardiovascular Research Institute Basel (CRIB)University Hospital BaselBaselSwitzerland
| | - Tobias Zimmermann
- Department of Cardiology and Cardiovascular Research Institute Basel (CRIB)University Hospital BaselBaselSwitzerland
| | - Eleni Michou
- Department of Cardiology and Cardiovascular Research Institute Basel (CRIB)University Hospital BaselBaselSwitzerland
| | - Danielle M. Gualandro
- Department of Cardiology and Cardiovascular Research Institute Basel (CRIB)University Hospital BaselBaselSwitzerland
| | - Andreas Häberlin
- Department of Cardiology, Inselspital, University Hospital BernUniversity of BernBernSwitzerland
- sitem Center for Translational Medicine and Biomedical EntrepreneurshipUniversity of BernBernSwitzerland
| | - Hildegard Tanner
- Department of Cardiology, Inselspital, University Hospital BernUniversity of BernBernSwitzerland
| | | | - Albina Nowak
- Department of Endocrinology and Clinical NutritionUniversity Hospital ZurichZurichSwitzerland
| | - Otmar Pfister
- Department of Cardiology and Cardiovascular Research Institute Basel (CRIB)University Hospital BaselBaselSwitzerland
| | - Tobias Breidthardt
- Department of Cardiology and Cardiovascular Research Institute Basel (CRIB)University Hospital BaselBaselSwitzerland
| | - Christian Mueller
- Department of Cardiology and Cardiovascular Research Institute Basel (CRIB)University Hospital BaselBaselSwitzerland
| | - Tobias Reichlin
- Department of Cardiology, Inselspital, University Hospital BernUniversity of BernBernSwitzerland
- Department of Cardiology and Cardiovascular Research Institute Basel (CRIB)University Hospital BaselBaselSwitzerland
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Skampardoni S, Poulikakos D, Malik M, Green D, Kalra PA. The potential of electrocardiography for cardiac risk prediction in chronic and end-stage kidney disease. Nephrol Dial Transplant 2020; 34:1089-1098. [PMID: 30085289 DOI: 10.1093/ndt/gfy255] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2018] [Indexed: 11/14/2022] Open
Abstract
Cardiovascular mortality is very high in chronic and end-stage kidney disease (ESKD). However, risk stratification data are lacking. Sudden cardiac deaths are among the most common cardiovascular causes of death in these populations. As a result, many studies have assessed the prognostic potential of various electrocardiographic parameters in the renal population. Recent data from studies of implantable loop recordings in haemodialysis patients from five different countries have shed light on a pre-eminent bradyarrhythmic risk of mortality. Importantly, heart block addressed by permanent pacing system was detected in a proportion of patients during the prolonged recording periods. Standard electrocardiogram is inexpensive, non-invasive and easily accessible. Hence, risk prediction models using this simple investigation tool could easily translate into clinical practice. We believe that electrocardiographic assessment is currently under-valued in renal populations. For this review, we identified studies from the preceding 10 years that assessed the use of conventional and novel electrocardiographic biomarkers as risk predictors in chronic and ESKD. The review indicates that conventional electrocardiographic markers are not reliable for risk stratification in the renal populations. Novel parameters have shown promising results in smaller studies, but further validation in larger populations is required.
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Affiliation(s)
- Sofia Skampardoni
- Faculty of Biology, Medicine and Health, University of Manchester, Manchester, UK.,Renal Department, Salford Royal NHS Trust, Salford, UK
| | - Dimitrios Poulikakos
- Faculty of Biology, Medicine and Health, University of Manchester, Manchester, UK.,Renal Department, Salford Royal NHS Trust, Salford, UK
| | - Marek Malik
- National Heart and Lung Institute, Imperial College, London, UK
| | - Darren Green
- Faculty of Biology, Medicine and Health, University of Manchester, Manchester, UK.,Renal Department, Salford Royal NHS Trust, Salford, UK
| | - Philip A Kalra
- Faculty of Biology, Medicine and Health, University of Manchester, Manchester, UK.,Renal Department, Salford Royal NHS Trust, Salford, UK
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Jaroszyński A, Furmaga J, Zapolski T, Zaborowski T, Rudzki S, Dąbrowski W. The improvement of QRS-T angle as a manifestation of reverse electrical remodeling following renal transplantation in end-stage kidney disease patients on haemodialysis. BMC Nephrol 2019; 20:441. [PMID: 31791259 PMCID: PMC6889434 DOI: 10.1186/s12882-019-1624-3] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2019] [Accepted: 11/13/2019] [Indexed: 01/19/2023] Open
Abstract
Background Successful renal transplantation (RT) reverses some of the cardiac changes and reduces cardiac mortality in hemodialysis (HD) patients. Widened QRS-T angle reflects both ventricular repolarization and depolarization. It is considered a sensitive and strong predictor of heart ventricular remodeling as well as a powerful and independent risk stratifier suitable in predicting cardiac events in various clinical settings. The study aimed to assess the influence of the RT on QRS-T angle and to evaluate factors influencing QRS-T changes in renal transplanted recipients (RTRs). Methods Fifty-four selected HD patients who have undergone RT were included. Blood chemistry, echocardiography, and QRS-T angle were evaluated 5 times: about 1 week, 3 months, 6 months, 1 year and 3 years after RT. Results An improvement of echocardiographic parameters was observed. The dynamics of changes in individual parameters were, however, variable. QRS-T angle correlated with echocardiographic parameters. The biphasic pattern of the decreases of QRS-T angle was observed. The first decrease took place in the third month of follow-up. The second decrease of QRS-T angle was observed after 1 year of follow-up. The QRS-T angle was higher in RTRs compared with controls during each evaluation. Multivariable analysis demonstrated that the decrease of left ventricle enddiastolic volume was an independent predictor of early QRS-T angle improvement. The increase of left ventricle ejection fraction was found to be the independent predictor of the late QRS-T angle improvement. Conclusions RT induces biphasic reverse electrical remodeling as assessed by the narrowing of QRS-T angle. Early decrease of QRS-T angle is mainly due to the normalization of volume status, whereas late decrease is associated predominantly with the improvement of cardiac contractile function.
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Affiliation(s)
- Andrzej Jaroszyński
- Institute of Medical Sciences, Jan Kochanowski University in Kielce, Al. IX Wieków Kielc 19A, 25-317, Kielce, Poland. .,Department of Family Medicine, Medical University of Lublin, Lublin, Poland.
| | - Jacek Furmaga
- Department of General and Transplant Surgery and Nutritional Treatment, Medical University of Lublin, Lublin, Poland
| | - Tomasz Zapolski
- Department of Cardiology, Medical University of Lublin, Lublin, Poland
| | - Tomasz Zaborowski
- Department of Anesthesiology and Intensive Care, Medical University of Lublin, Lublin, Poland
| | - Sławomir Rudzki
- Department of General and Transplant Surgery and Nutritional Treatment, Medical University of Lublin, Lublin, Poland
| | - Wojciech Dąbrowski
- Department of Anesthesiology and Intensive Care, Medical University of Lublin, Lublin, Poland
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Hnatkova K, Seegers J, Barthel P, Novotny T, Smetana P, Zabel M, Schmidt G, Malik M. Clinical value of different QRS-T angle expressions. Europace 2019; 20:1352-1361. [PMID: 29016907 PMCID: PMC6075511 DOI: 10.1093/europace/eux246] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2017] [Accepted: 07/06/2017] [Indexed: 01/28/2023] Open
Abstract
Aims Increased spatial angle between QRS complex and T wave loop orientations has repeatedly been shown to predict cardiac risk. However, there is no consensus on the methods for the calculation of the angle. This study compared the reproducibility and predictive power of three most common ways of QRS-T angle assessment. Methods and results Electrocardiograms of 352 healthy subjects, 941 survivors of acute myocardial infarction (MI), and 605 patients recorded prior to the implantation of automatic defibrillator [implantable cardioverter defibrillator (ICD)] were used to obtain QRS-T angle measurements by the maximum R to T (MRT), area R to T (ART), and total cosine R to T (TCRT) methods. The results were compared in terms of physiologic reproducibility and power to predict mortality in the cardiac patients during 5-year follow-up. Maximum R to T results were significantly less reproducible compared to the other two methods. Among both survivors of acute MI and ICD recipients, TCRT method was statistically significantly more powerful in predicting mortality during follow-up. Among the acute MI survivors, increased spatial QRS-T angle (TCRT assessment) was particularly powerful in predicting sudden cardiac death with the area under the receiver operator characteristic of 78% (90% confidence interval 63-90%). Among the ICD recipients, TCRT also predicted mortality significantly among patients with prolonged QRS complex duration when the spatial orientation of the QRS complex is poorly defined. Conclusion The TCRT method for the assessment of spatial QRS-T angle appears to offer important advantages in comparison to other methods of measurement. This approach should be included in future clinical studies of the QRS-T angle. The TCRT method might also be a reasonable candidate for the standardization of the QRS-T angle assessment.
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Affiliation(s)
- Katerina Hnatkova
- National Heart and Lung Institute, Imperial College, Dovehouse Street, London, UK
| | - Joachim Seegers
- Division of Cardiology, Department of Internal Medicine II, University Hospital Regensburg, Franz-Josef-Strauß-Allee 11, Regensburg, Germany
| | - Petra Barthel
- Innere Medizin I, Klinikum rechts der Isar, Technische Universität München, Ismaninger Str. 22, Munich, Germany
| | - Tomas Novotny
- Department of internal medicine and cardiology, Faculty of Medicine, University Hospital Brno, Masaryk University, Jihlavska 20, Brno, Czech Republic
| | - Peter Smetana
- Medizinische Abteilung mit Kardiologie, Wilhelminenspital der Stadt Wien, Montleartstraße 37, Vienna, Austria
| | - Markus Zabel
- Department of Cardiology and Pneumology, Heart Center, University Medical Center Göttingen, Robert-Koch-Str. 40, Göttingen, Germany
| | - Georg Schmidt
- Innere Medizin I, Klinikum rechts der Isar, Technische Universität München, Ismaninger Str. 22, Munich, Germany.,DZHK (German Center for Cardiovascular Research), partner site Munich Heart Alliance, Munich, Germany
| | - Marek Malik
- National Heart and Lung Institute, Imperial College, Dovehouse Street, London, UK
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Poulikakos D, Hnatkova K, Skampardoni S, Green D, Kalra P, Malik M. Sudden Cardiac Death in Dialysis: Arrhythmic Mechanisms and the Value of Non-invasive Electrophysiology. Front Physiol 2019; 10:144. [PMID: 30873044 PMCID: PMC6401645 DOI: 10.3389/fphys.2019.00144] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2018] [Accepted: 02/07/2019] [Indexed: 01/10/2023] Open
Abstract
Sudden Cardiac Death (SCD) is the leading cause of cardiovascular death in dialysis patients. This review discusses potential underlying arrhythmic mechanisms of SCD in the dialysis population. It examines recent evidence from studies using implantable loop recorders and from electrophysiological studies in experimental animal models of chronic kidney disease. The review summarizes advances in the field of non-invasive electrophysiology for risk prediction in dialysis patients focusing on the predictive value of the QRS-T angle and of the assessments of autonomic imbalance by means of heart rate variability analysis. Future research directions in non-invasive electrophysiology are identified to advance the understanding of the arrhythmic mechanisms. A suggestion is made of incorporation of non-invasive electrophysiology procedures into clinical practice. Key Concepts: - Large prospective studies in dialysis patients with continuous ECG monitoring are required to clarify the underlying arrhythmic mechanisms of SCD in dialysis patients. - Obstructive sleep apnoea may be associated with brady-arrhythmias in dialysis patients. Studies are needed to elucidate the burden and impact of sleeping disorders on arrhythmic complications in dialysis patients. - The QRS-T angle has the potential to be used as a descriptor of uremic cardiomyopathy. - The QRS-T angle can be calculated from routine collected surface ECGs. Multicenter collaboration is required to establish best methodological approach and normal values. - Heart Rate Variability provides indirect assessment of cardiac modulation that may be relevant for cardiac risk prediction in dialysis patients. Short-term recordings with autonomic provocations are likely to overcome the limitations of out of hospital 24-h recordings and should be prospectively assessed.
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Affiliation(s)
- Dimitrios Poulikakos
- Renal Department, Salford Royal NHS Foundation Trust, Salford, United Kingdom
- Centre for Cardiac Research, Institute of Cardiovascular Sciences, The University of Manchester, Manchester, United Kingdom
| | - Katerina Hnatkova
- National Heart and Lung Institute, Imperial College London, London, United Kingdom
| | - Sofia Skampardoni
- Renal Department, Salford Royal NHS Foundation Trust, Salford, United Kingdom
- Centre for Cardiac Research, Institute of Cardiovascular Sciences, The University of Manchester, Manchester, United Kingdom
| | - Darren Green
- Renal Department, Salford Royal NHS Foundation Trust, Salford, United Kingdom
- Centre for Cardiac Research, Institute of Cardiovascular Sciences, The University of Manchester, Manchester, United Kingdom
| | - Philip Kalra
- Renal Department, Salford Royal NHS Foundation Trust, Salford, United Kingdom
- Centre for Cardiac Research, Institute of Cardiovascular Sciences, The University of Manchester, Manchester, United Kingdom
| | - Marek Malik
- National Heart and Lung Institute, Imperial College London, London, United Kingdom
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Skampardoni S, Green D, Hnatkova K, Malik M, Kalra PA, Poulikakos D. QRS-T Angle Predicts Cardiac Risk and Correlates With Global Longitudinal Strain in Prevalent Hemodialysis Patients. Front Physiol 2019; 10:145. [PMID: 30858805 PMCID: PMC6397862 DOI: 10.3389/fphys.2019.00145] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2018] [Accepted: 02/07/2019] [Indexed: 12/31/2022] Open
Abstract
Background: Cardiovascular disease is the commonest cause of death in hemodialysis (HD) patients but accurate risk prediction is lacking. The spatial QRS – T angle is a promising electrophysiological marker for sudden cardiac death risk stratification. The aim of this study was to assess the prognostic value of spatial QRS-T angle derived from standard 12 lead electrocardiograms (ECG) and its association with echocardiographic parameters in HD patients. Methods: This prospective study of 178 prevalent HD patients (aged 67 ± 14 years, 72% men) collected ECG and echocardiographic data on an annual basis. Baseline echocardiograms at study entry were used for cross-sectional comparisons with ECGs. Study endpoints were all-cause mortality, cardiovascular mortality, and major adverse cardiac events (MACE). The QRS – T angle was calculated from standard 10-s ECG as the total cosine R to T (TCRT) using singular value decomposition and expressed in degrees. TCRT above 100° was defined as abnormal. Results: During a follow-up period of 36 ± 19 months, 74 patients died, including 17 cardiac deaths, and 54 suffered from MACE. In multivariate Cox regression analysis, QRS-T angle by TCRT at baseline was associated with increased cardiovascular mortality both as a continuous value and dichotomized below or above 100° (HR 1.016, p = 0.029, CI: 1.002–1.030 and HR 3.506, CI: 1.118–10.995, p = 0.031 respectively) and with MACE dichotomized at 100° (HR 1.902, CI: 1.046–3.459; p = 0.035). In multivariate regression analysis including baseline parameters, echocardiographic global longitudinal strain (GLS) was significantly correlated with TCRT (F 9.648, r2 = 0.192, standardized β = 0.331, unstandardized β = 3.567, t = 4.4429, CI: 1.976–5.157, p < 0.001). Conclusion: TCRT correlates with GLS and is independently associated with cardiac deaths and MACE in HD patients.
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Affiliation(s)
- Sofia Skampardoni
- Department of Renal Medicine, Salford Royal NHS Foundation Trust and The University of Manchester, Manchester, United Kingdom
| | - Darren Green
- Department of Renal Medicine, Salford Royal NHS Foundation Trust and The University of Manchester, Manchester, United Kingdom
| | - Katerina Hnatkova
- National Heart and Lung Institute, Imperial College London, London, United Kingdom
| | - Marek Malik
- National Heart and Lung Institute, Imperial College London, London, United Kingdom
| | - Philip A Kalra
- Department of Renal Medicine, Salford Royal NHS Foundation Trust and The University of Manchester, Manchester, United Kingdom
| | - Dimitrios Poulikakos
- Department of Renal Medicine, Salford Royal NHS Foundation Trust and The University of Manchester, Manchester, United Kingdom
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Poulikakos D, Hnatkova K, Banerjee D, Malik M. Association of QRS-T angle and heart rate variability with major cardiac events and mortality in hemodialysis patients. Ann Noninvasive Electrocardiol 2018; 23:e12570. [PMID: 29938866 DOI: 10.1111/anec.12570] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/29/2018] [Revised: 05/02/2018] [Accepted: 05/14/2018] [Indexed: 11/27/2022] Open
Abstract
INTRODUCTION Mortality in hemodialysis (HD) patients is high with significant proportion attributed to fatal arrhythmias. In a pilot study, we showed that intradialytic electrocardiographic (ECG) monitoring can yield stable profiles of selected repolarisation descriptors and heart rate variability (HRV) parameters. This study investigated the relationship of these ECG markers with major adverse cardiac events (MACE) and mortality. METHODS Continuous ECGs were obtained during HD and repeated five times at 2-week intervals. The QRS-T angle calculated as Total Cosine R to T (TCRT) and T-wave morphology dispersion (TMD) were calculated in overlapping 10 s ECG segments. High- (HF) and low (LF)-frequency components and the LF/HF ratio of HRV were calculated every 5 min. These indices were averaged during the first hour of dialysis and subsequently overall recordings in each subject. RESULTS All ECG parameters were available in 72 patients aged 61 ± 15, 23 (31.9%) females and 26 (36.1%) diabetics. After a median follow up of 54.8 months, 16 patients died, 20 were transplanted, and 9 suffered MACE. TCRT (in degrees) was higher and LF/HF was lower in patients who died compared to survivors (112 ± 30 vs. 73 ± 35, p = 0.000 and 0.222 ± 0.418 vs. 0.401 ± 0.274, p = 0.000, respectively) and in MACE positive compared to negative (117 ± 40 vs. 77 ± 34, p = 0.017 and 0.125 ± 0.333 vs.0.401 ± 0.274, p = 0.007 respectively). In multivariate Cox regression analysis of mortality risk adjusted for age, diabetes mellitus, and coronary artery disease, TCRT and LF/HF remained significant predictors (p < 0.05). CONCLUSION QRS-T angle and HRV may serve risk assessment in future prospective studies in HD patients.
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Affiliation(s)
- Dimitrios Poulikakos
- Renal Unit, Centre for Cardiac Research, Institute of Cardiovascular Sciences, Salford Royal NHS Foundation Trust, Manchester, UK
| | | | - Debasish Banerjee
- Renal and Transplantation Unit, St. Georges University Hospital NHS Foundation Trust, Cardiology Clinical Academic Group, Molecular and Clinical Sciences Research Institute, St George's, University of London, London, UK
| | - Marek Malik
- Imperial College, National Heart and Lung Institute, London, UK
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Tereshchenko LG, Sotoodehnia N, Sitlani CM, Ashar FN, Kabir M, Biggs ML, Morley MP, Waks JW, Soliman EZ, Buxton AE, Biering-Sørensen T, Solomon SD, Post WS, Cappola TP, Siscovick DS, Arking DE. Genome-Wide Associations of Global Electrical Heterogeneity ECG Phenotype: The ARIC (Atherosclerosis Risk in Communities) Study and CHS (Cardiovascular Health Study). J Am Heart Assoc 2018; 7:e008160. [PMID: 29622589 PMCID: PMC6015433 DOI: 10.1161/jaha.117.008160] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/20/2017] [Accepted: 03/07/2018] [Indexed: 11/21/2022]
Abstract
BACKGROUND ECG global electrical heterogeneity (GEH) is associated with sudden cardiac death. We hypothesized that a genome-wide association study would identify genetic loci related to GEH. METHODS AND RESULTS We tested genotyped and imputed variants in black (N=3057) and white (N=10 769) participants in the ARIC (Atherosclerosis Risk in Communities) study and CHS (Cardiovascular Health Study). GEH (QRS-T angle, sum absolute QRST integral, spatial ventricular gradient magnitude, elevation, azimuth) was measured on 12-lead ECGs. Linear regression models were constructed with each GEH variable as an outcome, adjusted for age, sex, height, body mass index, study site, and principal components to account for ancestry. GWAS identified 10 loci that showed genome-wide significant association with GEH in whites or joint ancestry. The strongest signal (rs7301677, near TBX3) was associated with QRS-T angle (white standardized β+0.16 [95% CI 0.13-0.19]; P=1.5×10-26), spatial ventricular gradient elevation (+0.11 [0.08-0.14]; P=2.1×10-12), and spatial ventricular gradient magnitude (-0.12 [95% CI -0.15 to -0.09]; P=5.9×10-15). Altogether, GEH-SNPs explained 1.1% to 1.6% of GEH variance. Loci on chromosomes 4 (near HMCN2), 5 (IGF1R), 11 (11p11.2 region cluster), and 7 (near ACTB) are novel ECG phenotype-associated loci. Several loci significantly associated with gene expression in the left ventricle (HMCN2 locus-with HMCN2; IGF1R locus-with IGF1R), and atria (RP11-481J2.2 locus-with expression of a long non-coding RNA and NDRG4). CONCLUSIONS We identified 10 genetic loci associated with ECG GEH. Replication of GEH GWAS findings in independent cohorts is warranted. Further studies of GEH-loci may uncover mechanisms of arrhythmogenic remodeling in response to cardiovascular risk factors.
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Affiliation(s)
- Larisa G Tereshchenko
- Knight Cardiovascular Institute, Oregon Health & Science University, Portland, OR
- Division of Cardiology, Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, MD
| | - Nona Sotoodehnia
- Cardiovascular Health Research Unit, Department of Medicine, University of Washington, Seattle, WA
| | - Colleen M Sitlani
- Cardiovascular Health Research Unit, Department of Medicine, University of Washington, Seattle, WA
| | - Foram N Ashar
- McKusick-Nathans Institute of Genetic Medicine, Johns Hopkins University School of Medicine, Baltimore, MD
| | - Muammar Kabir
- Knight Cardiovascular Institute, Oregon Health & Science University, Portland, OR
| | - Mary L Biggs
- Cardiovascular Health Research Unit, Department of Medicine, University of Washington, Seattle, WA
- Department of Biostatistics, University of Washington, Seattle, WA
| | - Michael P Morley
- Penn Cardiovascular Institute and Department of Medicine, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA
| | - Jonathan W Waks
- Division of Cardiovascular Medicine, Beth Israel Deaconess Medical Center Harvard Medical School, Boston, MA
| | - Elsayed Z Soliman
- Cardiology Section, Division of Public Health Sciences and Department of Medicine, Epidemiological Cardiology Research Center, Wake Forest School of Medicine, Winston Salem, NC
| | - Alfred E Buxton
- Division of Cardiovascular Medicine, Beth Israel Deaconess Medical Center Harvard Medical School, Boston, MA
| | | | - Scott D Solomon
- Brigham and Women's Hospital, Harvard Medical School, Boston, MA
| | - Wendy S Post
- Division of Cardiology, Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, MD
| | - Thomas P Cappola
- Penn Cardiovascular Institute and Department of Medicine, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA
| | | | - Dan E Arking
- McKusick-Nathans Institute of Genetic Medicine, Johns Hopkins University School of Medicine, Baltimore, MD
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12
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Fu L, Zhou Q, Zhu W, Lin H, Ding Y, Shen Y, Hu J, Hong K. Do Implantable Cardioverter Defibrillators Reduce Mortality in Patients With Chronic Kidney Disease at All Stages? Int Heart J 2017; 58:371-377. [PMID: 28539571 DOI: 10.1536/ihj.16-357] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 07/09/2024]
Abstract
The benefits of implantable cardioverter defibrillator (ICD) implantation in chronic kidney disease (CKD) patients with high sudden cardiac death (SCD) risk are uncertain. To clarify the effects of receiving an ICD in CKD patients, we conducted this meta-analysis to identify the effects of ICDs on patients with CKD, including those on dialysis. We searched the Cochrane library, EMBASE, PubMed, and clinical trials for studies published before July 2016. Eleven studies including 20,196 CKD patients were considered for inclusion. The pooled analysis suggested that patients with an estimated glomerular filtration rate (eGFR) < 60 mL/minute/1.73 m2 would benefit from receiving treatments with ICDs compared with patients without an ICD device (aHR = 0.74; 95% confidence interval [CI], 0.63 to 0.86). [corrected]. This is the first report of a subgroup analysis on the survival rate of ICD implantation in CKD patients according to an eGFR group. The subgroup analysis indicated a similar protective association of ICDs in stage 3 (aHR = 0.71; 95% CI, 0.61 to 0.82) and 5 (aHR = 0.71; 95% CI, 0.54 to 0.92) CKD patients [corrected] compared with the control group. However, there was no significant improvement in all-cause mortality in stage 4 CKD patients (aHR = 1.02; 95%CI, 0.75 to 1.37) [corrected]. This is the first meta-analysis reporting that ICD implantation reduces all-cause mortality in stage 3 and 5 [corrected] CKD patients. However, the data do not indicate there is any benefit to ICD implantation in stage 4 [corrected] CKD patients.
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MESH Headings
- Death, Sudden, Cardiac/epidemiology
- Death, Sudden, Cardiac/etiology
- Death, Sudden, Cardiac/prevention & control
- Defibrillators, Implantable
- Global Health
- Humans
- Incidence
- Registries
- Renal Insufficiency, Chronic/complications
- Renal Insufficiency, Chronic/diagnosis
- Renal Insufficiency, Chronic/mortality
- Risk Assessment
- Risk Factors
- Survival Rate/trends
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Affiliation(s)
- Linghua Fu
- Department of Cardiovascular Medicine, the Second Affiliated Hospital of Nanchang University
| | - Qiongqiong Zhou
- Department of Cardiovascular Medicine, the Second Affiliated Hospital of Nanchang University
| | - Wengen Zhu
- Department of Cardiovascular Medicine, the Second Affiliated Hospital of Nanchang University
| | - Huang Lin
- Department of Cardiovascular Medicine, the Second Affiliated Hospital of Nanchang University
| | - Ying Ding
- Department of Cardiovascular Medicine, the Second Affiliated Hospital of Nanchang University
| | - Yang Shen
- Department of Cardiovascular Medicine, the Second Affiliated Hospital of Nanchang University
| | - Jinzhu Hu
- Department of Cardiovascular Medicine, the Second Affiliated Hospital of Nanchang University
| | - Kui Hong
- Department of Cardiovascular Medicine, the Second Affiliated Hospital of Nanchang University
- Jiangxi Key Laboratory of Molecular Medicine
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13
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Guldenring D, Finlay DD, Bond RR, Kennedy A, McLaughlin J, Galeotti L, Strauss DG. Computing the spatial QRS-T angle using reduced electrocardiographic lead sets. J Electrocardiol 2016; 49:794-799. [PMID: 27609012 DOI: 10.1016/j.jelectrocard.2016.07.015] [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: 05/16/2016] [Indexed: 11/25/2022]
Abstract
The 'spatial QRS-T angle' (SA) is frequently determined using linear lead transformation matrices that require the entire 12-lead electrocardiogram (ECG). While this approach is adequate when using 12-lead ECG data that is recorded in the resting supine position, it is not optimal in monitoring applications. This is because maintaining a good quality recording of the complete 12-lead ECG in monitoring applications is difficult. In this research, we assessed the differences between the 'gold standard' SA as determined using the Frank VGG and the SA as determined using different reduced lead systems (RLSs). The random error component (span of the Bland-Altman 95% limits of agreement) of the differences between the 'gold standard' SA and the SA values based upon the different RLSs was quantified. This was performed for all 62 RLSs that can be constructed from Mason-Likar (ML) limb leads I, II and all possible precordial lead subsets that contain between one and five of the precordial leads V1 to V6. The RLS with the smallest lead set size that produced SA estimates of a quality similar to what is achieved using the ML 12-lead ECG was based upon ML limb leads I, II and precordial leads V1, V3 and V6. The random error component (mean [95% confidence interval]) associated with this RLS and the ML 12-lead ECG were found to be 40.74° [35.56°-49.29°] and 39.57° [33.78°-45.70°], respectively. Our findings suggest that a RLS that is based upon the ML limb leads I and II and the three best precordial leads can yield SA estimates of a quality similar to what is achieved when using the complete ML 12-lead ECG.
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Affiliation(s)
- Daniel Guldenring
- Ulster University, Jordanstown Campus, Shore Road, Newtownabbey, Co. Antrim, Northern Ireland, UK.
| | - Dewar D Finlay
- Ulster University, Jordanstown Campus, Shore Road, Newtownabbey, Co. Antrim, Northern Ireland, UK
| | - Raymond R Bond
- Ulster University, Jordanstown Campus, Shore Road, Newtownabbey, Co. Antrim, Northern Ireland, UK
| | - Alan Kennedy
- Ulster University, Jordanstown Campus, Shore Road, Newtownabbey, Co. Antrim, Northern Ireland, UK
| | - James McLaughlin
- Ulster University, Jordanstown Campus, Shore Road, Newtownabbey, Co. Antrim, Northern Ireland, UK
| | - Loriano Galeotti
- Office of Science and Engineering Laboratories, CDRH, US FDA, Silver Spring, MD, USA
| | - David G Strauss
- Office of Science and Engineering Laboratories, CDRH, US FDA, Silver Spring, MD, USA
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14
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Electrocardiographic predictors of mortality and sudden cardiac death in patients with end stage renal disease on hemodialysis. J Electrocardiol 2016; 49:848-854. [PMID: 27554424 DOI: 10.1016/j.jelectrocard.2016.07.020] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2016] [Indexed: 11/23/2022]
Abstract
Patients with end stage renal disease (ESRD) on hemodialysis experience a high incidence of cardiovascular mortality, and sudden cardiac death (SCD) accounts for approximately 25% of all deaths in this patient population. Despite this high risk of SCD, many non-invasive SCD risk stratification tools that are frequently applied to other patient populations (such as those with prior myocardial infarction and reduced left ventricular systolic function) may be less useful markers of increased SCD risk in ESRD. Improved SCD risk stratification tools for use specifically in patients on hemodialysis are therefore necessary to optimally target use of primary prevention interventions aimed at decreasing SCD incidence. Electrocardiography is an effective, non-invasive SCD risk stratification tool in hemodialysis patients. This article reviews data supporting the association between various ECG parameters (QT interval, spatial QRS-T angle, signal averaged ECG, heart rate variability, and T-wave alternans) and mortality/SCD in the dialysis population. Despite the association between abnormal ECG parameters and SCD, it remains unclear if these abnormal parameters (such as prolonged QT interval) are mechanistically related to SCD and/or ventricular arrhythmias, or if they are simply markers for more severe cardiac disease, such as left ventricular hypertrophy, that may independently predispose to SCD. Current obstacles that impair widespread implementation of ECG risk stratification in the hemodialysis population are also discussed.
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15
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Waks JW, Tereshchenko LG. Global electrical heterogeneity: A review of the spatial ventricular gradient. J Electrocardiol 2016; 49:824-830. [PMID: 27539162 DOI: 10.1016/j.jelectrocard.2016.07.025] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2016] [Indexed: 11/18/2022]
Abstract
The ventricular gradient, an electrocardiographic concept calculated by integrating the area under the QRS complex and T-wave, represents the degree and direction of myocardial electrical heterogeneity. Although the concept of the ventricular gradient was first introduced in the 1930s, it has not yet found a place in routine electrocardiography. In the modern era, it is relatively simple to calculate the ventricular gradient in three dimensions (the spatial ventricular gradient (SVG)), and there is now renewed interest in using the SVG as a tool for risk stratification of ventricular arrhythmias and sudden cardiac death. This manuscript will review the history of the ventricular gradient, describe its electrophysiological meaning and significance, and discuss its clinical utility.
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Affiliation(s)
- Jonathan W Waks
- Division of Cardiovascular Medicine, Harvard-Thorndike Electrophysiology Institute, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA, USA.
| | - Larisa G Tereshchenko
- Knight Cardiovascular Institute, Oregon Health & Science University, Portland, OR, USA
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16
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Ramesh S, Zalucky A, Hemmelgarn BR, Roberts DJ, Ahmed SB, Wilton SB, Jun M. Incidence of sudden cardiac death in adults with end-stage renal disease: a systematic review and meta-analysis. BMC Nephrol 2016; 17:78. [PMID: 27401469 PMCID: PMC4940956 DOI: 10.1186/s12882-016-0293-8] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2015] [Accepted: 06/14/2016] [Indexed: 01/08/2023] Open
Abstract
BACKGROUND Although sudden cardiac death (SCD) is recognized as a distinct cause of death in patients with end stage renal disease (ESRD), its incidence has not been well summarized. METHODS We performed a systematic review and meta-analysis of the literature based on a protocol developed a priori. We searched MEDLINE and EMBASE (inception to March 2015) for randomized controlled trials and cohort studies reporting the incidence of SCD in adult patients with ESRD on hemodialysis or peritoneal dialysis. We collected data on number of SCD as well as the definition of SCD for each individual study. A random-effects model was used to summarize the incidence of SCD. We conducted subgroup analyses to explore sources of heterogeneity. RESULTS Forty two studies (n = 80,382 patients) were included in the meta-analysis. The incidence of SCD among adults with ESRD ranged from 0.4 to 10.04 deaths per 100 person-years. The definitions and assessment of SCD varied across the included studies. There was evidence of significant heterogeneity (I(2) = 98; p < 0.001), which was not explained by subgroup analyses stratified by mean age, proportion of hypertensive or diabetic patients, follow-up time, study size, or type of cohort studied. CONCLUSION Current estimates of the incidence of SCD among adults with ESRD vary widely. There is a need for further studies to more accurately estimate the incidence of SCD in patients with ESRD.
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Affiliation(s)
- Sharanya Ramesh
- />Cumming School of Medicine, University of Calgary, Calgary, AB Canada
| | - Ann Zalucky
- />Cumming School of Medicine, University of Calgary, Calgary, AB Canada
| | - Brenda R. Hemmelgarn
- />Department of Medicine, Division of Nephrology, University of Calgary, Health Sciences Building, Room G233, 3330 Hospital Drive NW, Calgary, AB T2N 4N1 Canada
- />Department of Community Health Sciences, University of Calgary, Calgary, AB Canada
| | - Derek J. Roberts
- />Department of Community Health Sciences, University of Calgary, Calgary, AB Canada
- />Department of Surgery, University of Calgary and the Foothills Medical Centre, Calgary, AB Canada
| | - Sofia B. Ahmed
- />Cumming School of Medicine, University of Calgary, Calgary, AB Canada
- />Libin Cardiovascular Institute of Alberta, Calgary, AB Canada
| | - Stephen B. Wilton
- />Cumming School of Medicine, University of Calgary, Calgary, AB Canada
- />Libin Cardiovascular Institute of Alberta, Calgary, AB Canada
| | - Min Jun
- />Department of Medicine, Division of Nephrology, University of Calgary, Health Sciences Building, Room G233, 3330 Hospital Drive NW, Calgary, AB T2N 4N1 Canada
- />Department of Community Health Sciences, University of Calgary, Calgary, AB Canada
- />The George Institute for Global Health, The University of Sydney, Sydney, Australia
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17
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Salvi V, Clark E, Karnad DR, Macfarlane PW, Panicker GK, Hingorani P, Kothari S. Comparison of the spatial QRS-T angle derived from digital ECGs recorded using conventional electrode placement with that derived from Mason-Likar electrode position. J Electrocardiol 2016; 49:714-9. [PMID: 27395365 DOI: 10.1016/j.jelectrocard.2016.06.006] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2016] [Indexed: 10/21/2022]
Abstract
BACKGROUND The spatial QRS-T angle is ideally derived from orthogonal leads. We compared the spatial QRS-T angle derived from orthogonal leads reconstructed from digital 12-lead ECGs and from digital Holter ECGs recorded with the Mason-Likar (M-L) electrode positions. METHODS AND RESULTS Orthogonal leads were constructed by the inverse Dower method and used to calculate spatial QRS-T angle by (1) a vector method and (2) a net amplitude method, in 100 volunteers. Spatial QRS-T angles from standard and M-L ECGs differed significantly (57°±18° vs 48°±20° respectively using net amplitude method and 53°±28° vs 48°±23° respectively by vector method; p<0.001). Difference in amplitudes in leads V4-V6 was also observed between Holter and standard ECGs, probably due to a difference in electrical potential at the central terminal. CONCLUSION Mean spatial QRS-T angles derived from standard and M-L lead systems differed by 5°-9°. Though statistically significant, these differences may not be clinically significant.
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Affiliation(s)
| | - Elaine Clark
- Institute of Cardiovascular and Medical Sciences, University of Glasgow, Glasgow, UK
| | | | - Peter W Macfarlane
- Institute of Cardiovascular and Medical Sciences, University of Glasgow, Glasgow, UK
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18
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Tereshchenko LG, Kim ED, Oehler A, Meoni LA, Ghafoori E, Rami T, Maly M, Kabir M, Hawkins L, Tomaselli GF, Lima JA, Jaar BG, Sozio SM, Estrella M, Kao WHL, Parekh RS. Electrophysiologic Substrate and Risk of Mortality in Incident Hemodialysis. J Am Soc Nephrol 2016; 27:3413-3420. [PMID: 27129390 DOI: 10.1681/asn.2015080916] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2015] [Accepted: 03/30/2016] [Indexed: 01/19/2023] Open
Abstract
The single leading cause of mortality on hemodialysis is sudden cardiac death. Whether measures of electrophysiologic substrate independently associate with mortality is unknown. We examined measures of electrophysiologic substrate in a prospective cohort of 571 patients on incident hemodialysis enrolled in the Predictors of Arrhythmic and Cardiovascular Risk in End Stage Renal Disease Study. A total of 358 participants completed both baseline 5-minute and 12-lead electrocardiogram recordings on a nondialysis day. Measures of electrophysiologic substrate included ventricular late potentials by the signal-averaged electrocardiogram and spatial mean QRS-T angle measured on the averaged beat recorded within a median of 106 days (interquartile range, 78-151 days) from dialysis initiation. The cohort was 59% men, and 73% were black, with a mean±SD age of 55±13 years. Transthoracic echocardiography revealed a mean±SD ejection fraction of 65.5%±12.0% and a mean±SD left ventricular mass index of 66.6±22.3 g/m2.7 During 864.6 person-years of follow-up, 77 patients died; 35 died from cardiovascular causes, of which 15 were sudden cardiac deaths. By Cox regression analysis, QRS-T angle ≥75° significantly associated with increased risk of cardiovascular mortality (hazard ratio, 2.99; 95% confidence interval, 1.31 to 6.82) and sudden cardiac death (hazard ratio, 4.52; 95% confidence interval, 1.17 to 17.40) after multivariable adjustment for demographic, cardiovascular, and dialysis factors. Abnormal signal-averaged electrocardiogram measures did not associate with mortality. In conclusion, spatial QRS-T angle but not abnormal signal-averaged electrocardiogram significantly associates with cardiovascular mortality and sudden cardiac death independent of traditional risk factors in patients starting hemodialysis.
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Affiliation(s)
| | - Esther D Kim
- Child Health Evaluative Sciences, Research Institute, The Hospital for Sick Children, Toronto, Ontario, Canada
| | - Andrew Oehler
- Department of Medicine, Oregon Health and Science University, Portland, Oregon
| | - Lucy A Meoni
- Departments of Biostatistics and.,Department of Medicine, and.,Welch Center for Prevention, Epidemiology, and Clinical Research, Baltimore, Maryland
| | | | - Tejal Rami
- Epidemiology, Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland
| | - Maggie Maly
- Epidemiology, Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland
| | | | | | | | - Joao A Lima
- Division of Cardiology, Department of Medicine
| | - Bernard G Jaar
- Welch Center for Prevention, Epidemiology, and Clinical Research, Baltimore, Maryland.,Epidemiology, Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland.,Nephrology Center of Maryland, Baltimore, Maryland; and.,Division of Nephrology, Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, Maryland
| | - Stephen M Sozio
- Epidemiology, Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland.,Division of Nephrology, Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, Maryland
| | - Michelle Estrella
- Division of Nephrology, Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, Maryland
| | - W H Linda Kao
- Department of Medicine, and.,Welch Center for Prevention, Epidemiology, and Clinical Research, Baltimore, Maryland.,Epidemiology, Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland
| | - Rulan S Parekh
- Child Health Evaluative Sciences, Research Institute, The Hospital for Sick Children, Toronto, Ontario, Canada; .,Department of Medicine, and.,Epidemiology, Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland.,Division of Nephrology, Department of Pediatrics and Medicine, The Hospital for Sick Children, University Health Network and University of Toronto, Ontario, Canada
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19
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Spatial/Frontal QRS-T Angle Predicts All-Cause Mortality and Cardiac Mortality: A Meta-Analysis. PLoS One 2015; 10:e0136174. [PMID: 26284799 PMCID: PMC4540436 DOI: 10.1371/journal.pone.0136174] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2014] [Accepted: 07/31/2015] [Indexed: 01/01/2023] Open
Abstract
BACKGROUND A number of studies have assessed the predictive effect of QRS-T angles in various populations since the last decade. The objective of this meta-analysis was to evaluate the prognostic value of spatial/frontal QRS-T angle on all-cause death and cardiac death. METHODS PubMed, EMBASE, and the Cochrane Central Register of Controlled Trials were searched from their inception until June 5, 2014. Studies reporting the predictive effect of spatial/frontal QRS-T angle on all-cause/cardiac death in all populations were included. Relative risk (RR) was used as a measure of effect. RESULTS Twenty-two studies enrolling 164,171 individuals were included. In the combined analysis in all populations, a wide spatial QRS-T angle was associated with an increase in all-cause death (maximum-adjusted RR: 1.40; 95% confidence interval [CI]: 1.32 to 1.48) and cardiac death (maximum-adjusted RR: 1.71; 95% CI: 1.54 to 1.90), a wide frontal QRS-T angle also predicted a higher rate of all-cause death (maximum-adjusted RR: 1.71; 95% CI: 1.54 to 1.90). Largely similar results were found using different methods of categorizing for QRS-T angles, and similar in subgroup populations such as general population, populations with suspected coronary heart disease or heart failure. Other stratified analyses and meta-analyses using unadjusted data also generated consistent findings. CONCLUSIONS Spatial QRS-T angle held promising prognostic value on all-cause death and cardiac death. Frontal QRS-T angle was also a promising predictor of all-cause death. Given the good predictive value of QRS-T angle, a combined stratification strategy in which QRS-T angle is of vital importance might be expected.
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20
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Guldenring D, Finlay DD, Bond RR, Kennedy A, McLaughlin J, Galeotti L, Strauss DG. The derivation of the spatial QRS-T angle and the spatial ventricular gradient using the Mason-Likar 12-lead electrocardiogram. J Electrocardiol 2015; 48:1045-52. [PMID: 26381798 DOI: 10.1016/j.jelectrocard.2015.08.009] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2015] [Indexed: 11/30/2022]
Abstract
Research has shown that the 'spatial QRS-T angle' (SA) and the 'spatial ventricular gradient' (SVG) have clinical value in a number of different applications. The determination of the SA and the SVG requires vectorcardiographic data. Such data is seldom recorded in clinical practice. The SA and the SVG are therefore frequently derived from 12-lead electrocardiogram (ECG) data using linear lead transformation matrices. This research compares the performance of two previously published linear lead transformation matrices (Kors and ML2VCG) in deriving the SA and the SVG from Mason-Likar (ML) 12-lead ECG data. This comparison was performed through an analysis of the estimation errors that are made when deriving the SA and the SVG for all 181 subjects in the study population. The estimation errors were quantified as the systematic error (mean difference) and the random error (span of the Bland-Altman 95% limits of agreement). The random error was found to be the dominating error component for both the Kors and the ML2VCG matrix. The random error [ML2VCG; Kors; result of the paired, two-sided Pitman-Morgan test for statistical significance of differences in the error variance between ML2VCG and Kors] for the vectorcardiographic parameters SA, magnitude of the SVG, elevation of the SVG and azimuth of the SVG were found to be [37.33°; 50.52°; p<0.001], [30.17mVms; 39.09mVms; p<0.001], [36.77°; 47.62°; p=0.001] and [63.45°; 80.32°; p<0.001] respectively. The findings of this research indicate that in comparison to the Kors matrix the ML2VCG provides greater precision for estimating the SA and SVG from ML 12-lead ECG data.
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Affiliation(s)
| | | | | | | | | | - Loriano Galeotti
- Office of Science and Engineering Laboratories, CDRH, US FDA, Silver Spring, MD, USA
| | - David G Strauss
- Office of Science and Engineering Laboratories, CDRH, US FDA, Silver Spring, MD, USA
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21
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Boriani G, Savelieva I, Dan GA, Deharo JC, Ferro C, Israel CW, Lane DA, La Manna G, Morton J, Mitjans AM, Vos MA, Turakhia MP, Lip GY. Chronic kidney disease in patients with cardiac rhythm disturbances or implantable electrical devices: clinical significance and implications for decision making-a position paper of the European Heart Rhythm Association endorsed by the Heart Rhythm Society and the Asia Pacific Heart Rhythm Society. Europace 2015; 17:1169-96. [PMID: 26108808 PMCID: PMC6281310 DOI: 10.1093/europace/euv202] [Citation(s) in RCA: 117] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
Affiliation(s)
- Giuseppe Boriani
- Corresponding author. Giuseppe Boriani, Institute of Cardiology, Department of Experimental, Diagnostic and Specialty Medicine, University of Bologna, S.Orsola-Malpighi University Hospital, Via Massarenti 9, 40138 Bologna, Italy. Tel: +39 051 349858; fax: +39 051 344859. E-mail address:
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22
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Man S, Maan AC, Schalij MJ, Swenne CA. Vectorcardiographic diagnostic & prognostic information derived from the 12-lead electrocardiogram: Historical review and clinical perspective. J Electrocardiol 2015; 48:463-75. [PMID: 26027545 DOI: 10.1016/j.jelectrocard.2015.05.002] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2014] [Indexed: 12/18/2022]
Abstract
In the course of time, electrocardiography has assumed several modalities with varying electrode numbers, electrode positions and lead systems. 12-lead electrocardiography and 3-lead vectorcardiography have become particularly popular. These modalities developed in parallel through the mid-twentieth century. In the same time interval, the physical concepts underlying electrocardiography were defined and worked out. In particular, the vector concept (heart vector, lead vector, volume conductor) appeared to be essential to understanding the manifestations of electrical heart activity, both in the 12-lead electrocardiogram (ECG) and in the 3-lead vectorcardiogram (VCG). Not universally appreciated in the clinic, the vectorcardiogram, and with it the vector concept, went out of use. A revival of vectorcardiography started in the 90's, when VCGs were mathematically synthesized from standard 12-lead ECGs. This facilitated combined electrocardiography and vectorcardiography without the need for a special recording system. This paper gives an overview of these historical developments, elaborates on the vector concept and seeks to define where VCG analysis/interpretation can add diagnostic/prognostic value to conventional 12-lead ECG analysis.
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Affiliation(s)
- Sumche Man
- Department of Cardiology, Leiden University Medical Center, Leiden, The Netherlands
| | - Arie C Maan
- Department of Cardiology, Leiden University Medical Center, Leiden, The Netherlands
| | - Martin J Schalij
- Department of Cardiology, Leiden University Medical Center, Leiden, The Netherlands
| | - Cees A Swenne
- Department of Cardiology, Leiden University Medical Center, Leiden, The Netherlands.
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23
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Chen J, Lin Y, Yu J, Chen W, Xu Z, Yang Z, Zeng C, Li W, Lai X, Lu Q, Zhou J, Tian B, Xu J, Lin Y, Du Z, Zhang A. Changes of Virtual Planar QRS and T Vectors Derived from Holter in the Populations with and without Diabetes Mellitus. Ann Noninvasive Electrocardiol 2015; 21:69-81. [PMID: 25940734 PMCID: PMC6931701 DOI: 10.1111/anec.12276] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/13/2023] Open
Abstract
Aims Research related to type 2 diabetes mellitus (DM) and parameters of electrocardiography (ECG) was limited. Patients with and without DM (NDM) were randomly enrolled in a study to exploit the influence of DM on planar QRS and T vectors derived from the Virtual Holter process. Methods A total of 216 (NDM) and 127 DM patients were consecutively and randomly recruited. We selected a 1‐minute length of ECG, which was scheduled for analysis at 4 AM. After a series of calculating algorisms, we received the virtual planar vector parameters. Results Patients with DM were elderly (65.61 ± 12.08 vs 59.41 ± 16.86 years, P < 0.001); higher morbidity of hypertension (76.38% vs 58.14%, P < 0.001) and coronary artery disease (44.09% vs 32.41%, P = 0.03); thicker interventricular septum (10.92 ± 1.77 vs 10.08 ± 1.96 mm, P < 0.001) and left ventricular posterior wall (9.84 ± 1.38 vs 9.39 ± 1.66 mm, P = 0.03); higher lipid levels and average heart rate (66.67 ± 12.04 vs 61.87 ± 13.36 bpm, P < 0.01); higher angle of horizontal QRS vector (HQRSA, –2.87 ± 48.48 vs –19.00 ± 40.18 degrees, P < 0.01); lower maximal magnitude of horizontal T vector (HTV, 2.33 ± 1.47 vs 2.88 ± 1.89 mm, P = 0.01) and maximal magnitude of right side T vector (2.77 ± 1.55 vs 3.27 ± 1.92 mm, P = 0.03), and no difference in angle of frontal QRS‐T vector (FQRSTA, 32.77 ± 54.20 vs 28.39 ± 52.87 degrees, P = 0.74) compared with patients having NDM. After adjusting for confounding factors, DM was significantly effective on FQRSTA (regression coefficient –40.0, 95%CI –66.4 to –13.6, P < 0.01), HQRSA (regression coefficient 22.6, 95%CI 2.5 to 42.8, P = 0.03), and HTV (regression coefficient 0.9, 95%CI 0.2 to 1.7, P = 0.01). Confounding factors included: sex, 2‐hour postprandial blood glucose, smoking, triglyceride, apolipoprotein A, creatinine, left ventricular ejection fraction, and average heart rate. Conclusions The risk factors of DM and lipid metabolism abnormality particularly apolipoprotein A significantly modified parameters of virtual planar QRS and T vector, including frontal QRS‐T angle.
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Affiliation(s)
- Jia Chen
- First Affiliated Hospital of Jinan University, Second Department of Cardiology, Guangdong No. 2 Provincial People's Hospital, Guangzhou, China
| | - Yubi Lin
- Department of Cardiology, First Affiliated Hospital of Jinan University, Guangzhou, China.,Guangdong Cardiovascular Institute, Guangdong Academy of Medical Sciences, Guangdong General hospital, Guangzhou, 510080, P.R., China
| | - Jian Yu
- Department of Cardiology, First Affiliated Hospital of Jinan University, Guangzhou, China
| | - Wanqun Chen
- Medical College of Jinan University, Guangzhou, China
| | - Zhe Xu
- Division of Cardiac Surgery, First Affiliated Hospital of Sun-Yat-sen University, Guangzhou, China
| | - Zhenzhen Yang
- Department of Cardiology, First Affiliated Hospital of Jinan University, Guangzhou, China
| | - Chuqian Zeng
- Department of Cardiology, First Affiliated Hospital of Jinan University, Guangzhou, China
| | - Wenfeng Li
- Department of Cardiology, First Affiliated Hospital of Jinan University, Guangzhou, China
| | - Xiaoshu Lai
- Department of Cardiology, First Affiliated Hospital of Jinan University, Guangzhou, China
| | - Qiji Lu
- Department of Cardiology, First Affiliated Hospital of Jinan University, Guangzhou, China
| | - Jingwen Zhou
- Department of Cardiology, First Affiliated Hospital of Jinan University, Guangzhou, China
| | - Bixia Tian
- Department of Cardiology, First Affiliated Hospital of Jinan University, Guangzhou, China
| | - Jing Xu
- Department of Cardiology, First Affiliated Hospital of Jinan University, Guangzhou, China
| | - Yanping Lin
- Medical College of Guangdong Province, Zhanjiang, China
| | - Zuoyi Du
- Second Department of Cardiology, Guangdong No. 2 Provincial People's Hospital, Guangzhou, China
| | - Aidong Zhang
- Department of Cardiology, First Affiliated Hospital of Jinan University, Guangzhou, China
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24
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Poulikakos D, Banerjee D, Malik M. Repolarisation descriptors and heart rate variability in hemodialysed patients. Physiol Res 2014; 64:487-93. [PMID: 25470516 DOI: 10.33549/physiolres.932740] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
Abstract
T wave morphology (TWM) descriptors derived from Holter electrocardiograms during hemodialysis (HD) are of potential value for cardiac risk assessment in HD patients. Our knowledge on autonomic regulation of TWM descriptors is limited. The purpose of this study was to investigate the association between TWM parameters and heart rate variability (HRV) during intradialytic monitoring. In each of 81 patients on maintenance HD, continuous electrocardiograms were recorded 5 times during HD on alternate weeks. TWM descriptors were calculated every 5 s in overlapping 10-s ECG segments and Low Frequency (LF) (0.04 Hz to 0.15 Hz), High Frequency (HF) (0.15 Hz to 0.40 Hz) powers of the spectrum of HRV were calculated every five min. The calculated values of TWM and HRV were averaged during the first hour of the recordings and subsequently over all recordings in each subject. Analyzable data for HRV and TWM were available in 71 HD patients (aged 61+/-15, 36 % diabetics, 32 % females). LF in normalized units correlated positively with Total Cosine R to T (r=0.374, p=0.001) and negatively with T wave morphology dispersion (r=-0.253, p=0.033) after adjusting for heart rate. A heart rate independent association between repolarisation descriptors and HRV exists in HD patients. Autonomic modulation needs to be considered when using TWM characteristics for risk profiling of HD patients.
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Affiliation(s)
- D Poulikakos
- Cardiovascular Sciences Research Centre, St. George's University of London, Medical School, London, UK.
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25
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Sudden cardiac death in end stage renal disease: unlocking the mystery. J Nephrol 2014; 28:133-41. [PMID: 25391630 DOI: 10.1007/s40620-014-0151-3] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2014] [Accepted: 10/09/2014] [Indexed: 01/05/2023]
Abstract
Sudden cardiac death (SCD) is a major cause of concern in end stage renal disease (ESRD), contributing to 70% of cardiovascular mortality and 27% of all-cause mortality in dialysis patients. Yet its mechanisms and pathogenesis remain largely obscure. This review discusses the potential reasons for an exaggerated risk of SCD in ESRD populations taking into account recent studies and registry data and additionally explores the reasons for the reported recent decline in SCD. The types of arrhythmias typical of the hemodialysis population are yet to be fully characterised and in this paper, we introduce an ongoing implantable loop recorder (ILR) based study in hemodialysis patients--CRASH ILR (Cardio Renal Arrhythmia Study in Haemodialysis patients using Implantable Loop Recorders). The findings of this study will hopefully guide the design and implementation of larger ILR based studies before undertaking larger scale interventional therapeutic trials in this high risk population.
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26
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Abstract
For proper distribution of preventative resources, a more robust method of cardiac risk stratification should be encouraged in addition to merely reduced ejection fraction. To this end, the QRS-T angle, an electrocardiogram-derived measure of the difference in mean vectors of depolarization and repolarization, has been found associated with sudden cardiac death and other mortal and morbid outcomes in multiple observational studies over the past decade. The use of both frontal and spatial QRS-T angle in the prediction of future cardiac events including sudden cardiac death, all-cause mortality, and further cardiac morbidity is reviewed here.
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Affiliation(s)
- Andrew Oehler
- Internal Medicine Department, Oregon Health and Science University, Portland, OR
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27
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Voulgari C, Pagoni S, Tesfaye S, Tentolouris N. The spatial QRS-T angle: implications in clinical practice. Curr Cardiol Rev 2014; 9:197-210. [PMID: 23909632 PMCID: PMC3780345 DOI: 10.2174/1573403x113099990031] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/05/2012] [Accepted: 03/19/2013] [Indexed: 12/14/2022] Open
Abstract
The ventricular gradient (VG) as a concept was conceived in the 1930s and its calculation yielded information that was not otherwise obtainable. The VG was not utilized by clinicians at large because it was not easy to understand and its computation time-consuming. The contemporary spatial QRS-T angle is based on the concept of the VG and defined as its mathematical and physiological integral. Its current major clinical use is to assess the cardiac primary repolarization abnormalities in 3-dimensional spatial vectorial plans which are normally untraced in the presence of secondary electrophysiological activity in a 2-dimensional routine electrocardiogram (ECG). Currently the calculation of the spatial QRS-T angle can be easily computed on the basis of a classical ECG and contributes to localization of arrhythmogenic areas in the heart by assessing overall and local heterogeneity of the myocardial ventricular action potention duration. Recent population-based studies suggest that the spatial QRS-T angle is a dominant ECG predictor of future cardiovascular events and death and it is superior to more conventional ECG parameters. Its assessment warrants consideration for intensified primary and secondary cardiovascular prevention efforts and should be included in everyday clinical practice. This review addresses the nature and diagnostic potential of the spatial QRS-T angle. The main focus is its role in ECG assessment of dispersion of repolarization, a key factor in arrythmogeneity.
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Affiliation(s)
- Christina Voulgari
- First Department of Propaudeutic Internal Medicine, “Laiko” General Hospital, Athens University Medical School, Greece.
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28
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Ragupathi L, Pavri BB. Tools for risk stratification of sudden cardiac death: a review of the literature in different patient populations. Indian Heart J 2014; 66 Suppl 1:S71-81. [PMID: 24568833 DOI: 10.1016/j.ihj.2013.12.035] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2013] [Revised: 12/09/2013] [Accepted: 12/10/2013] [Indexed: 12/14/2022] Open
Abstract
While various modalities to determine risk of sudden cardiac death (SCD) have been reported in clinical studies, currently reduced left ventricular ejection fraction remains the cornerstone of SCD risk stratification. However, the absolute burden of SCD is greatest amongst populations without known cardiac disease. In this review, we summarize the evidence behind current guidelines for implantable cardioverter defibrillator (ICD) use for the prevention of SCD in patients with ischemic heart disease (IHD). We also evaluate the evidence for risk stratification tools beyond clinical guidelines in the general population, patients with IHD, and patients with other known or suspected medical conditions.
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Affiliation(s)
| | - Behzad B Pavri
- Thomas Jefferson University Hospital, Philadelphia, PA, USA.
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29
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Poulikakos D, Banerjee D, Malik M. Risk of sudden cardiac death in chronic kidney disease. J Cardiovasc Electrophysiol 2013; 25:222-31. [PMID: 24256575 DOI: 10.1111/jce.12328] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/03/2013] [Accepted: 11/12/2013] [Indexed: 12/14/2022]
Abstract
The review discusses the epidemiology and the possible underlying mechanisms of sudden cardiac death (SCD) in chronic kidney disease (CKD), and highlights the unmet clinical need for noninvasive risk stratification strategies in these patients. Although renal dysfunction shares common risk factors and often coexists with atherosclerotic cardiovascular disease, the presence of renal impairment increases the risk of arrhythmic complications to an extent that cannot be explained by the severity of the atherosclerotic process. Renal impairment is an independent risk factor for SCD from the early stages of CKD; the risk increases as renal function declines and reaches very high levels in patients with end-stage renal disease on dialysis. Autonomic imbalance, uremic cardiomyopathy, and electrolyte disturbances likely play a role in increasing the arrhythmic risk and can be potential targets for treatment. Cardioverter defibrillator treatment could be offered as lifesaving treatment in selected patients, although selection strategies for this treatment mode are presently problematic in dialyzed patients. The review also examines the current experience with risk stratification tools in renal patients and suggests that noninvasive electrophysiological testing during dialysis may be of clinical value as it provides the necessary standardized environment for reproducible measurements for risk stratification purposes.
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Affiliation(s)
- Dimitrios Poulikakos
- Cardiovascular Sciences Research Centre, St. George's University of London, London, UK; Renal and Transplantation Unit, St. George's Hospital NHS Trust, London, UK
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30
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Poulikakos D, Banerjee D, Malik M. Major arrhythmic events and T wave morphology descriptors in hemodialyzed patients. J Electrocardiol 2013; 47:240-3. [PMID: 24360879 DOI: 10.1016/j.jelectrocard.2013.11.010] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2013] [Indexed: 12/23/2022]
Abstract
BACKGROUND Sudden cardiac death is common in patients receiving regular hemodialysis (HD). We recently demonstrated that selected repolarization descriptors calculated from electrocardiographic monitoring during HD demonstrate intra-subject stability. In this study we followed up the initial cohort for major arrhythmic events (MAE). METHODS Holter electrocardiograms (ECGs) were recorded during dialysis in 81 HD patients and repeated 5 times at 2 week intervals. The QRS-to-T angle (TCRT), the principal component analysis (PCA) ratio and the T wave morphology dispersion (TMD) were calculated in overlapping 10 second ECG segments and averaged overall recordings in each patient. Patients were followed up for MAE and non-arrhythmic mortality. RESULTS During 18 ± 3 months, 3 patients experienced MAE. Compared to others, MAE patients exhibited extreme TCRT and TMD values and minimal intradialytic changes. CONCLUSION The prognostic value of repolarization descriptors from intradialytic monitoring should be assessed prospectively.
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Affiliation(s)
- Dimitrios Poulikakos
- Renal and Transplantation Unit, St. George's, University of London, London, United Kingdom; Cardiovascular Sciences Research Centre, St. George's, University of London, London, United Kingdom.
| | - Debasish Banerjee
- Renal and Transplantation Unit, St. George's, University of London, London, United Kingdom; Cardiovascular Sciences Research Centre, St. George's, University of London, London, United Kingdom
| | - Marek Malik
- Imperial College of Science Technology and Medicine, London, United Kingdom
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31
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Poulikakos D, Banerjee D, Malik M. T wave morphology changes during hemodialysis. J Electrocardiol 2013; 46:492-6. [DOI: 10.1016/j.jelectrocard.2013.07.006] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2013] [Indexed: 10/26/2022]
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32
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de Bie MK, Ajmone Marsan N, Gaasbeek A, Bax JJ, Delgado V, Rabelink TJ, Schalij MJ, Jukema JW. Echocardiographical determinants of an abnormal spatial QRS-T angle in chronic dialysis patients. Nephrol Dial Transplant 2013; 28:3045-52. [PMID: 24092849 DOI: 10.1093/ndt/gft347] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
BACKGROUND The spatial QRS-T angle describes the relation between ventricular depolarization and repolarization. Having a wide (abnormal) angle is considered an important predictor of arrhythmic events. Given the high incidence of sudden cardiac death in dialysis patients, this parameter is of particular interest in this patient group. The objective of this study was to assess the association of (modifiable) echocardiographic parameters and an abnormal spatial QRS-T angle in dialysis patients. METHODS A total of 94 consecutive dialysis patients were included. In all patients a 12-lead electrocardiogram (ECG), a two-dimensional echocardiogram and routine blood samples were obtained. The spatial QRS-T angle was then calculated from the 12-lead ECG. An abnormal spatial QRS-T angle was defined as ≥130° in males and ≥116° in females. RESULTS An abnormal spatial QRS-T angle was present in 27 (29%) patients. Patients with an abnormal spatial angle had a lower left ventricular ejection fraction (LVEF) of 47 ± 7 versus 55 ± 6% (P < 0.001) and had a higher left ventricular (LV) dyssynchrony, with a septal to lateral (S-L) delay of peak systolic velocity of 70 inter quartile range (iIQR) (40, 100) ms versus 30 IQR (10, 70) ms (P = 0.001), respectively. Multivariate logistic regression analysis controlling for possible confounders demonstrated that LVEF [odds ratio (OR) 0.82; 95% confidence interval (CI) 0.72-0.93, P = 0.001] and LV dyssynchrony (OR 1.19 per 10 ms; 95% CI 1.03-1.38, P = 0.02) were independent determinants of an abnormal spatial QRS-T angle in this patient group. CONCLUSIONS LVEF and dyssynchrony are echocardiographic determinants of an abnormal spatial QRS-T angle in dialysis patients and might therefore represent a potential target for the prevention of sudden cardiac death in these patients.
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Affiliation(s)
- Mihály K de Bie
- Department of Cardiology, Leiden University Medical Center, Leiden, The Netherlands
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33
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Franczyk-Skóra B, Gluba A, Banach M, Kozłowski D, Małyszko J, Rysz J. Prevention of sudden cardiac death in patients with chronic kidney disease. BMC Nephrol 2012. [PMID: 23206758 PMCID: PMC3519551 DOI: 10.1186/1471-2369-13-162] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
Abstract
Cardiovascular deaths account for about 40% of all deaths of patients with chronic kidney disease (CKD), particularly those on dialysis, while sudden cardiac death (SCD) might be responsible for as many as 60% of SCD in patients undergoing dialysis. Studies have demonstrated a number of factors occurring in hemodialysis (HD) that could lead to cardiac arrhythmias. Patients with CKD undergoing HD are at high risk of ventricular arrhythmia and SCD since changes associated with renal failure and hemodialysis-related disorders overlap. Antiarrhythmic therapy is much more difficult in patients with CKD, but the general principles are similar to those in patients with normal renal function - at first, the cause of arrhythmias should be found and eliminated. Also the choice of therapy is narrowed due to the altered pharmacokinetics of many drugs resulting from renal failure, neurotoxicity of certain drugs and their complex interactions. Cardiac pacing in elderly patients is a common method of treatment. Assessment of patients’ prognosis is important when deciding whether to implant complex devices. There are reports concerning greater risk of surgical complications, which depends also on the extent of the surgical site. The decision concerning implantation of a pacing system in patients with CKD should be made on the basis of individual assessment of the patient.
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Affiliation(s)
- Beata Franczyk-Skóra
- Department of Nephrology, Hypertension and Family Medicine, Medical University of Lodz, Lodz, Poland
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