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Atanasoski V, Petrović J, Maneski LP, Miletić M, Babić M, Nikolić A, Panescu D, Ivanović MD. A Morphology-Preserving Algorithm for Denoising of EMG-Contaminated ECG Signals. IEEE OPEN JOURNAL OF ENGINEERING IN MEDICINE AND BIOLOGY 2024; 5:296-305. [PMID: 38766540 PMCID: PMC11100958 DOI: 10.1109/ojemb.2024.3380352] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2023] [Revised: 12/11/2023] [Accepted: 03/15/2024] [Indexed: 05/22/2024] Open
Abstract
Goal: Clinical interpretation of an electrocardiogram (ECG) can be detrimentally affected by noise. Removal of the electromyographic (EMG) noise is particularly challenging due to its spectral overlap with the QRS complex. The existing EMG-denoising algorithms often distort signal morphology, thus obscuring diagnostically relevant information. Methods: Here, a new iterative regeneration method (IRM) for efficient EMG-noise suppression is proposed. The main hypothesis is that the temporary removal of the dominant ECG components enables extraction of the noise with the minimum alteration to the signal. The method is validated on SimEMG database of simultaneously recorded reference and noisy signals, MIT-BIH arrhythmia database and synthesized ECG signals, both with the noise from MIT Noise Stress Test Database. Results: IRM denoising and morphology-preserving performance is superior to the wavelet- and FIR-based benchmark methods. Conclusions: IRM is reliable, computationally non-intensive, fast and applicable to any number of ECG channels recorded by mobile or standard ECG devices.
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Affiliation(s)
- Vladimir Atanasoski
- Vinca Institute of Nuclear Sciences11351BelgradeSerbia
- HeartBeam, Inc.Santa ClaraCA95050USA
| | - Jovana Petrović
- Vinca Institute of Nuclear Sciences11351BelgradeSerbia
- HeartBeam, Inc.Santa ClaraCA95050USA
| | - Lana Popović Maneski
- Group for Biomedical Engineering and Nanobiotechnology, Institute of Technical Sciences of the SASA11000BelgradeSerbia
| | - Marjan Miletić
- Vinca Institute of Nuclear Sciences11351BelgradeSerbia
- HeartBeam, Inc.Santa ClaraCA95050USA
| | - Miloš Babić
- Institute for Cardiovascular Diseases Dedinje, Serbia11040BelgradeSerbia
| | - Aleksandra Nikolić
- Institute for Cardiovascular Diseases Dedinje, Serbia11040BelgradeSerbia
| | | | - Marija D. Ivanović
- Vinca Institute of Nuclear Sciences11351BelgradeSerbia
- HeartBeam, Inc.Santa ClaraCA95050USA
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Haregu T, Lekha TR, Jasper S, Kapoor N, Sathish T, Panniyammakal J, Tapp R, Thankappan KR, Mahal A, Absetz P, Fisher EB, Oldenburg B. The long-term effects of Kerala Diabetes Prevention Program on diabetes incidence and cardiometabolic risk: a study protocol. BMC Public Health 2023; 23:539. [PMID: 36945029 PMCID: PMC10030347 DOI: 10.1186/s12889-023-15392-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2023] [Accepted: 03/07/2023] [Indexed: 03/23/2023] Open
Abstract
INTRODUCTION India currently has more than 74.2 million people with Type 2 Diabetes Mellitus (T2DM). This is predicted to increase to 124.9 million by 2045. In combination with controlling blood glucose levels among those with T2DM, preventing the onset of diabetes among those at high risk of developing it is essential. Although many diabetes prevention interventions have been implemented in resource-limited settings in recent years, there is limited evidence about their long-term effectiveness, cost-effectiveness, and sustainability. Moreover, evidence on the impact of a diabetes prevention program on cardiovascular risk over time is limited. OBJECTIVES The overall aim of this study is to evaluate the long-term cardiometabolic effects of the Kerala Diabetes Prevention Program (K-DPP). Specific aims are 1) to measure the long-term effectiveness of K-DPP on diabetes incidence and cardiometabolic risk after nine years from participant recruitment; 2) to assess retinal microvasculature, microalbuminuria, and ECG abnormalities and their association with cardiometabolic risk factors over nine years of the intervention; 3) to evaluate the long-term cost-effectiveness and return on investment of the K-DPP; and 4) to assess the sustainability of community engagement, peer-support, and other related community activities after nine years. METHODS The nine-year follow-up study aims to reach all 1007 study participants (500 intervention and 507 control) from 60 randomized polling areas recruited to the original trial. Data are being collected in two phases. In phase 1 (Survey), we are admintsering a structured questionnaire, undertake physical measurements, and collect blood and urine samples for biochemical analysis. In phase II, we are inviting participants to undergo retinal imaging, body composition measurements, and ECG. All data collection is being conducted by trained Nurses. The primary outcome is the incidence of T2DM. Secondary outcomes include behavioral, psychosocial, clinical, biochemical, and retinal vasculature measures. Data analysis strategies include a comparison of outcome indicators with baseline, and follow-up measurements conducted at 12 and 24 months. Analysis of the long-term cost-effectiveness of the intervention is planned. DISCUSSION Findings from this follow-up study will contribute to improved policy and practice regarding the long-term effects of lifestyle interventions for diabetes prevention in India and other resource-limited settings. TRIAL REGISTRATION Australia and New Zealand Clinical Trials Registry-(updated from the original trial)ACTRN12611000262909; India: CTRI/2021/10/037191.
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Affiliation(s)
- Tilahun Haregu
- Baker Heart and Diabetes Institute, Melbourne, Australia.
- Melbourne School of Population and Global Health, University of Melbourne, Melbourne, Australia.
| | - T R Lekha
- Sree Chitra Tirunal Institute for Medical Sciences & Technology, Trivandrum, India
| | | | | | - Thirunavukkarasu Sathish
- Department of Family and Preventive Medicine, School of Medicine, Emory University, Atlanta, GA, USA
| | - Jeemon Panniyammakal
- Sree Chitra Tirunal Institute for Medical Sciences & Technology, Trivandrum, India
| | - Robyn Tapp
- Melbourne School of Population and Global Health, University of Melbourne, Melbourne, Australia
- Research Centre for Intelligent Health Care, Coventry University, Coventry, UK
| | | | - Ajay Mahal
- Melbourne School of Population and Global Health, University of Melbourne, Melbourne, Australia
| | - Pilvikki Absetz
- Faculty of Social Sciences, Tampere University, Tampere, Finland
| | - Edwin B Fisher
- Gillings School of Global Public Health, University of North Carolina, Chapel Hill, USA
| | - Brian Oldenburg
- Baker Heart and Diabetes Institute, Melbourne, Australia
- School of Psychology and Public Health, La Trobe University, Melbourne, Australia
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Baysal E, Mutluer FO, Dagsali AE, Kumrulu UC, Huang HD, Aksu T. Improved health-related quality of life after cardioneuroablation in patients with vasovagal syncope. J Interv Card Electrophysiol 2022:10.1007/s10840-022-01420-9. [PMID: 36357697 DOI: 10.1007/s10840-022-01420-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/22/2022] [Accepted: 11/04/2022] [Indexed: 11/12/2022]
Abstract
BACKGROUND As the most common cause of syncope, vasovagal syncope (VVS) is mediated by parasympathetic overactivity and/or sympathetic withdrawal. Although catheter ablation of ganglionated plexi or cardioneuroablation has been used to treat VVS, its role in quality of life (QoL) has not been formally evaluated. The aim of this study was to demonstrate if this novel treatment results in improvement QoL of patients with VVS. METHODS Twenty-seven consecutive patients (age: 34 ± 14 years, 51.8% male) with dominant cardioinhibitory type VVS were prospectively enrolled in the study. After confirmation of > 3 s asystole on head-up tilt testing (HUT), all patients underwent cardioneuroablation. ECGs were obtained prior to procedure and at 12-month follow-up visit. HUTs were repeated 1 month after cardioneuroablation procedures. QoL was assessed with the use of SF-36, EQ-5D, and EQ VAS questionnaires. RESULTS ECG, HUT, and QoL data were available in all patients. At 12-month follow-up, heart rate on rest ECG significantly increased (from 74 ± 15 to 84 ± 14 bpm, p = 0.003). Repeated HUTs were negative in 23 (85.1%) patients. All of 27 patients remained free of syncope. QoL assessed by SF-36 score significantly improved in postprocedural follow-up (92 ± 9 and 96 ± 11, p = 0.016). Similarly, significant improvements in mobility, self-care, and usual activity domains of EQ-5D were observed (mean scores of 3.0 ± 1.5 and 2.1 ± 1.3, p < 0.001; 1.3 ± 0.9 and 1.2 ± 0.6, p = 0.041; 1.7 ± 1.0 and 1.4 ± 0.8 respectively). EQ-VAS score also improved significantly (39 ± 24 to 77 ± 18, p < 0.001). CONCLUSION Our findings suggest that cardioneuroablation may be associated with intermediate term improvement in QoL in patients with VVS.
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Affiliation(s)
- Erkan Baysal
- Department of Cardiology, Gazi Yaşargil Training and Research Hospital, Diyarbakır, Turkey.
| | - Ferit Onur Mutluer
- Department of Cardiology, Yeditepe University Hospital, Istanbul, Turkey
| | | | | | - Henry D Huang
- Department of Cardiology, Rush Medical College, Chicago, IL, USA
| | - Tolga Aksu
- Department of Cardiology, Yeditepe University Hospital, Istanbul, Turkey
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Quinn J, Kim D, Rice BT, Hao WD. Natural language processing to classify electrocardiograms in patients with syncope: A preliminary study. Health Sci Rep 2022; 5:e904. [PMID: 36324425 PMCID: PMC9621468 DOI: 10.1002/hsr2.904] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2022] [Revised: 09/16/2022] [Accepted: 10/10/2022] [Indexed: 12/05/2022] Open
Affiliation(s)
- James Quinn
- Department of Emergency MedicineStanford UniversityCaliforniaStanfordUSA
| | - David Kim
- Department of Emergency MedicineStanford UniversityCaliforniaStanfordUSA
| | - Brian Travis Rice
- Department of Emergency MedicineStanford UniversityCaliforniaStanfordUSA
| | - Wei David Hao
- Department of Emergency MedicineStanford UniversityCaliforniaStanfordUSA
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Zormpas C, Kahl KG, Hohmann S, Oswald H, Stiel C, Veltmann C, Bauersachs J, Duncker D. Depressive Symptoms and Quality of Life in Patients With Heart Failure and an Implantable Cardioverter-Defibrillator. Front Psychiatry 2022; 13:827967. [PMID: 35782428 PMCID: PMC9247385 DOI: 10.3389/fpsyt.2022.827967] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/02/2021] [Accepted: 05/23/2022] [Indexed: 11/29/2022] Open
Abstract
BACKGROUND Heart failure (HF) is associated with development of depressive symptoms and reduced quality of life (QoL). Patients with HF and an implantable cardioverter-defibrillator (ICD) were evaluated regarding depressive symptoms and QoL. METHODS The present study included 446 patients with HF and an ICD. Depressive symptoms were assessed using the Patient Health Questionnaire 9 (PHQ-9), QoL was evaluated using the Minnesota Living with Heart Failure Questionnaire (MLHFQ). Functional ability and exercise tolerance were assessed at inclusion and after 6 months with help of the 6-min walking test (6MWT). RESULTS Patients included in the study had a mean age of 65.8 years and were predominantly male (83.6%), with mostly ischemic (n = 277; 62.1%) or dilated (n = 150; 33.6%) cardiomyopathy. One hundred ninety-three (43.2%) patients had depressive symptoms, of whom 75 patients (16.8%) were classified as moderate to severe depression according to the PHQ-9 at baseline. Depressive symptoms were associated with low QoL independent of NYHA functional class. High NYHA functional class, high PHQ-9 score, age and body mass index (BMI) were associated with a lower 6MWT at enrollment, while depressive symptoms (expressed as higher PHQ-9 score) and age were associated with a lower 6MWT after 6 months. Patients with history of smoking and a higher BMI showed higher PHQ-9 scores after 6 months. Patients under antidepressant medication showed improved PHQ-9 score after 6 months, indicating controlled/treated depression. However, patients with low QoL at inclusion remained with low QoL after 6 months. CONCLUSION Depressive symptoms correlate with low QoL and lower long-term functional status in patients with HF and an ICD. Depressive symptoms are associated with smoking and obesity, which themselves are risk factors for a poor prognosis in HF. Only a small fraction of patients with HF and ICD showing depressive symptoms receives appropriate treatment. Assessing depressive symptoms and lifestyle factors should be part of a multimodal treatment plan in patients with HF and an ICD.
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Affiliation(s)
- Christos Zormpas
- Hannover Heart Rhythm Center, Department of Cardiology and Angiology, Hannover Medical School, Hannover, Germany
| | - Kai G Kahl
- Department of Psychiatry, Social Psychiatry and Psychotherapy, Hannover Medical School, Hannover, Germany
| | - Stephan Hohmann
- Hannover Heart Rhythm Center, Department of Cardiology and Angiology, Hannover Medical School, Hannover, Germany
| | - Hanno Oswald
- Department of Cardiology, Pneumology, Angiology and Intensive Care Medicine, Klinikum Peine, Peine, Germany
| | - Christopher Stiel
- Department of Neurology, University Hospital Schleswig-Holstein, Kiel, Germany
| | - Christian Veltmann
- Hannover Heart Rhythm Center, Department of Cardiology and Angiology, Hannover Medical School, Hannover, Germany
| | - Johann Bauersachs
- Hannover Heart Rhythm Center, Department of Cardiology and Angiology, Hannover Medical School, Hannover, Germany
| | - David Duncker
- Hannover Heart Rhythm Center, Department of Cardiology and Angiology, Hannover Medical School, Hannover, Germany
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Zelnick LR, Shlipak MG, Soliman EZ, Anderson A, Christenson R, Lash J, Deo R, Rao P, Afshinnia F, Chen J, He J, Seliger S, Townsend R, Cohen DL, Go A, Bansal N. Prediction of Incident Atrial Fibrillation in Chronic Kidney Disease: The Chronic Renal Insufficiency Cohort Study. Clin J Am Soc Nephrol 2021; 16:1015-1024. [PMID: 34597264 PMCID: PMC8425618 DOI: 10.2215/cjn.01060121] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2021] [Accepted: 04/28/2021] [Indexed: 02/04/2023]
Abstract
BACKGROUND AND OBJECTIVES Atrial fibrillation (AF) is common in CKD and associated with poor kidney and cardiovascular outcomes. Prediction models developed using novel methods may be useful to identify patients with CKD at highest risk of incident AF. We compared a previously published prediction model with models developed using machine learning methods in a CKD population. DESIGN, SETTING, PARTICIPANTS, & MEASUREMENTS We studied 2766 participants in the Chronic Renal Insufficiency Cohort study without prior AF with complete cardiac biomarker (N-terminal pro-B-type natriuretic peptide and high-sensitivity troponin T) and clinical data. We evaluated the utility of machine learning methods as well as a previously validated clinical prediction model (Cohorts for Heart and Aging Research in Genomic Epidemiology [CHARGE]-AF, which included 11 predictors, using original and re-estimated coefficients) to predict incident AF. Discriminatory ability of each model was assessed using the ten-fold cross-validated C-index; calibration was evaluated graphically and with the Grønnesby and Borgan test. RESULTS Mean (SD) age of participants was 57 (11) years, 55% were men, 38% were Black, and mean (SD) eGFR was 45 (15) ml/min per 1.73 m2; 259 incident AF events occurred during a median of 8 years of follow-up. The CHARGE-AF prediction equation using original and re-estimated coefficients had C-indices of 0.67 (95% confidence interval, 0.64 to 0.71) and 0.67 (95% confidence interval, 0.64 to 0.70), respectively. A likelihood-based boosting model using clinical variables only had a C-index of 0.67 (95% confidence interval, 0.64 to 0.70); adding N-terminal pro-B-type natriuretic peptide, high-sensitivity troponin T, or both biomarkers improved the C-index by 0.04, 0.01, and 0.04, respectively. In addition to N-terminal pro-B-type natriuretic peptide and high-sensitivity troponin T, the final model included age, non-Hispanic Black race/ethnicity, Hispanic race/ethnicity, cardiovascular disease, chronic obstructive pulmonary disease, myocardial infarction, peripheral vascular disease, use of angiotensin-converting enzyme inhibitor/angiotensin receptor blockers, calcium channel blockers, diuretics, height, and weight. CONCLUSIONS Using machine learning algorithms, a model that included 12 standard clinical variables and cardiac-specific biomarkers N-terminal pro-B-type natriuretic peptide and high-sensitivity troponin T had moderate discrimination for incident AF in a CKD population.
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Affiliation(s)
- Leila R. Zelnick
- Kidney Research Institute and Division of Nephrology, University of Washington, Seattle, Washington
| | - Michael G. Shlipak
- Department of Medicine, University of California, San Francisco, California
| | - Elsayed Z. Soliman
- Department of Medicine, Wake Forest University, Winston-Salem, North Carolina
| | - Amanda Anderson
- Department of Epidemiology, Tulane University, New Orleans, Louisiana
| | | | - James Lash
- Division of Nephrology, University of Illinois–Chicago, Chicago, Illinois
| | - Rajat Deo
- Departments of Medicine and Epidemiology and Biostatistics, University of Pennsylvania, Philadelphia, Pennsylvania
| | - Panduranga Rao
- Department of Internal Medicine, Division of Nephrology, University of Michigan, Ann Arbor, Michigan
| | - Farsad Afshinnia
- Department of Medicine, Division of Nephrology, University of Michigan, Oakland, California
| | - Jing Chen
- Department of Medicine, Tulane University, New Orleans, Louisiana
| | - Jiang He
- Department of Epidemiology, Tulane University, New Orleans, Louisiana
| | - Stephen Seliger
- Department of Medicine, University of Maryland, Baltimore, Maryland
| | - Raymond Townsend
- Department of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania
| | - Debbie L. Cohen
- Department of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania
| | - Alan Go
- Division of Nephrology, University of Washington, Seattle, Washington
| | - Nisha Bansal
- Kidney Research Institute and Division of Nephrology, University of Washington, Seattle, Washington
- Kaiser Permanente Northern California, Oakland, California
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Lim AZ, Jones DM, Bates MGD, Schaefer AM, O'Sullivan J, Feeney C, Farrugia ME, Bourke JP, Turnbull DM, Gorman GS, McFarland R, Ng YS. Risk of cardiac manifestations in adult mitochondrial disease caused by nuclear genetic defects. Open Heart 2021. [PMCID: PMC8021886 DOI: 10.1136/openhrt-2020-001510] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/13/2023] Open
Abstract
Objective Regular cardiac surveillance is advocated for patients with primary mitochondrial DNA disease. However, there is limited information to guide clinical practice in mitochondrial conditions caused by nuclear DNA defects. We sought to determine the frequency and spectrum of cardiac abnormalities identified in adult mitochondrial disease originated from the nuclear genome. Methods Adult patients with a genetically confirmed mitochondrial disease were identified and followed up at the national clinical service for mitochondrial disease in Newcastle upon Tyne, UK (January 2009 to December 2018). Case notes, molecular genetics reports, laboratory data and cardiac investigations, including serial electrocardiograms and echocardiograms, were reviewed. Results In this cohort-based observational study, we included 146 adult patients (92 women) (mean age 53.6±18.7 years, 95% CI 50.6 to 56.7) with a mean follow-up duration of 7.9±5.1 years (95% CI 7.0 to 8.8). Eleven different nuclear genotypes were identified: TWNK, POLG, RRM2B, OPA1, GFER, YARS2, TYMP, ETFDH, SDHA, TRIT1 and AGK. Cardiac abnormalities were detected in 14 patients (9.6%). Seven of these patients (4.8%) had early-onset cardiac manifestations: hypertrophic cardiomyopathy required cardiac transplantation (AGK; n=2/2), left ventricular (LV) hypertrophy and bifascicular heart block (GFER; n=2/3) and mild LV dysfunction (GFER; n=1/3, YARS2; n=1/2, TWNK; n=1/41). The remaining seven patients had acquired heart disease most likely related to conventional cardiovascular risk factors and presented later in life (14.6±12.8 vs 55.1±8.9 years, p<0.0001). Conclusions Our findings demonstrate that the risk of cardiac involvement is genotype specific, suggesting that routine cardiac screening is not indicated for most adult patients with nuclear gene-related mitochondrial disease.
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Affiliation(s)
- Albert Zishen Lim
- Wellcome Centre for Mitochondrial Research, Translational and Clinical Research Institute, Newcastle University, Newcastle upon Tyne, UK
- NHS Highly Specialised Service for Rare Mitochondrial Disorders, Newcastle Upon Tyne Hospitals NHS Foundation Trust, Newcastle Upon Tyne, UK
| | - Daniel M Jones
- Wellcome Centre for Mitochondrial Research, Translational and Clinical Research Institute, Newcastle University, Newcastle upon Tyne, UK
| | - Matthew G D Bates
- Department of Cardiology, James Cook University Hospital, Middlesbrough, UK
| | - Andrew M Schaefer
- Wellcome Centre for Mitochondrial Research, Translational and Clinical Research Institute, Newcastle University, Newcastle upon Tyne, UK
- NHS Highly Specialised Service for Rare Mitochondrial Disorders, Newcastle Upon Tyne Hospitals NHS Foundation Trust, Newcastle Upon Tyne, UK
| | - John O'Sullivan
- Cardiology, Freeman Hospital Cardiothoracic Centre, Newcastle upon Tyne, UK
| | - Catherine Feeney
- Wellcome Centre for Mitochondrial Research, Translational and Clinical Research Institute, Newcastle University, Newcastle upon Tyne, UK
- NHS Highly Specialised Service for Rare Mitochondrial Disorders, Newcastle Upon Tyne Hospitals NHS Foundation Trust, Newcastle Upon Tyne, UK
| | - Maria E Farrugia
- Queen Elizabeth University Hospital, Institute of Neurological Sciences, Glasgow, UK
| | - John P Bourke
- Cardiology, Freeman Hospital Cardiothoracic Centre, Newcastle upon Tyne, UK
| | - Doug M Turnbull
- Wellcome Centre for Mitochondrial Research, Translational and Clinical Research Institute, Newcastle University, Newcastle upon Tyne, UK
- NHS Highly Specialised Service for Rare Mitochondrial Disorders, Newcastle Upon Tyne Hospitals NHS Foundation Trust, Newcastle Upon Tyne, UK
| | - Gráinne S Gorman
- Wellcome Centre for Mitochondrial Research, Translational and Clinical Research Institute, Newcastle University, Newcastle upon Tyne, UK
- NHS Highly Specialised Service for Rare Mitochondrial Disorders, Newcastle Upon Tyne Hospitals NHS Foundation Trust, Newcastle Upon Tyne, UK
| | - Robert McFarland
- Wellcome Centre for Mitochondrial Research, Translational and Clinical Research Institute, Newcastle University, Newcastle upon Tyne, UK
- NHS Highly Specialised Service for Rare Mitochondrial Disorders, Newcastle Upon Tyne Hospitals NHS Foundation Trust, Newcastle Upon Tyne, UK
| | - Yi Shiau Ng
- Wellcome Centre for Mitochondrial Research, Translational and Clinical Research Institute, Newcastle University, Newcastle upon Tyne, UK
- NHS Highly Specialised Service for Rare Mitochondrial Disorders, Newcastle Upon Tyne Hospitals NHS Foundation Trust, Newcastle Upon Tyne, UK
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Daralammouri Y, Azamtta M, Hamayel H, Adas A, Sawalmeh O, Ismail Y, Zyoud SH. Impact of Prone Position on 12-Lead Electrocardiogram in Healthy Adults: A Comparison Study with Standard Electrocardiogram. Cardiol Res Pract 2021; 2021:6653061. [PMID: 33628490 PMCID: PMC7892256 DOI: 10.1155/2021/6653061] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/02/2020] [Revised: 01/26/2021] [Accepted: 02/02/2021] [Indexed: 02/07/2023] Open
Abstract
BACKGROUND The standard electrocardiogram (ECG) is commonly performed in the supine posture. It may be difficult to report ECG in a supine posture for those who are unable to adopt the supine posture because of certain circumstances such as acute respiratory distress syndrome-patients who are placed in a prone position for long periods to improve oxygenation. Few data are available on the impact of the prone position on the ECG recording with electrodes on the posterior chest. Examining and analyzing the type and extent of changes observed in the prone ECG in healthy adults have become vitally valuable. METHODS A cross-sectional observational study enrolled forty healthy adults (24 males and 16 females) aged between 18 and 40 years. The ECG was performed in two different body positions, supine and prone. Influence of prone position on the heart rate, mean QRS axis, amplitude, morphology, duration, mean T wave axis and polarity, mean P wave axis, PR, and mean QTc duration was evaluated. RESULTS The mean heart rate was higher in the prone position (73.2 ± 12.4 bpm) compared with the supine position (69.5 ± 11.5 bpm, p = 0.03). The QRS duration decreased considerably from supine (92.8 ± 12.6 ms) to prone (84.9 ± 11.9 ms, p < 0.001). The mean QRS axis moved to the left in the prone posture (40.5° ± 32°) relative to the supine (49° ± 28°, p=0.015). The QRS amplitude in the precordial leads was significantly decreased from supine (7.42 ± 3.1 mV) to prone (3.68 ± 1.7 mV, p < 0.001). In addition, changes in the QRS morphology in leads V1-V3 with the appearance of new Q waves were noted. A notable variation in the mean corrected QT (QTc) period with decrease in duration in prone posture ECG (385 ± 64.8) relative to supine (406 ± 18.8, p=0.05). CONCLUSIONS Prone position ECG resulted in significant changes in healthy adults that should be aware of this as this can affect diagnosis and management strategies. Further studies are needed to investigate the impact of prone position on ECG recording in patients with cardiovascular diseases.
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Affiliation(s)
- Yunis Daralammouri
- 1Department of Cardiology, An-Najah National University Hospital, Nablus, State of Palestine
- 2Department of Medicine, Faculty of Medicine and Health Sciences, An-Najah National University, Nablus, State of Palestine
| | - Murad Azamtta
- 1Department of Cardiology, An-Najah National University Hospital, Nablus, State of Palestine
| | - Hamza Hamayel
- 3Department of Internal Medicine, An-Najah National University Hospital, Nablus, State of Palestine
| | - Amro Adas
- 3Department of Internal Medicine, An-Najah National University Hospital, Nablus, State of Palestine
| | - Osama Sawalmeh
- 3Department of Internal Medicine, An-Najah National University Hospital, Nablus, State of Palestine
| | - Yahia Ismail
- 1Department of Cardiology, An-Najah National University Hospital, Nablus, State of Palestine
- 2Department of Medicine, Faculty of Medicine and Health Sciences, An-Najah National University, Nablus, State of Palestine
| | - Saed H. Zyoud
- 4Poison Control and Drug Information Center, Faculty of Medicine and Health Sciences, An-Najah National University, Nablus, State of Palestine
- 5Department of Clinical and Community Pharmacy, Faculty of Medicine and Health Sciences, An-Najah National University, Nablus, State of Palestine
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Liu Z, Zhou B, Li Y, Tang M, Miao F. Continuous Blood Pressure Estimation From Electrocardiogram and Photoplethysmogram During Arrhythmias. Front Physiol 2020; 11:575407. [PMID: 33013491 PMCID: PMC7509183 DOI: 10.3389/fphys.2020.575407] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2020] [Accepted: 08/13/2020] [Indexed: 12/02/2022] Open
Abstract
Objective Continuous blood pressure (BP) provides valuable information for the disease management of patients with arrhythmias. The traditional intra-arterial method is too invasive for routine healthcare settings, whereas cuff-based devices are inferior in reliability and comfortable for long-term BP monitoring during arrhythmias. The study aimed to investigate an indirect method for continuous and cuff-less BP estimation based on electrocardiogram (ECG) and photoplethysmogram (PPG) signals during arrhythmias and to test its reliability for the determination of BP using invasive BP (IBP) as reference. Methods Thirty-five clinically stable patients (15 with ventricular arrhythmias and 20 with supraventricular arrhythmias) who had undergone radiofrequency ablation were enrolled in this study. Their ECG, PPG, and femoral arterial IBP signals were simultaneously recorded with a multi-parameter monitoring system. Fifteen features that have the potential ability in indicating beat-to-beat BP changes during arrhythmias were extracted from the ECG and PPG signals. Four machine learning algorithms, decision tree regression (DTR), support vector machine regression (SVR), adaptive boosting regression (AdaboostR), and random forest regression (RFR), were then implemented to develop the BP models. Results The results showed that the mean value ± standard deviation of root mean square error for the estimated systolic BP (SBP), diastolic BP (DBP) with the RFR model against the reference in all patients were 5.87 ± 3.13 and 3.52 ± 1.38 mmHg, respectively, which achieved the best performance among all the models. Furthermore, the mean error ± standard deviation of error between the estimated SBP and DBP with the RFR model against the reference in all patients were −0.04 ± 6.11 and 0.11 ± 3.62 mmHg, respectively, which complied with the Association for the Advancement of Medical Instrumentation and the British Hypertension Society (Grade A) standards. Conclusion The results indicated that the utilization of ECG and PPG signals has the potential to enable cuff-less and continuous BP estimation in an indirect way for patients with arrhythmias.
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Affiliation(s)
- ZengDing Liu
- Chinese Academy of Sciences Key Laboratory for Health Informatics, Shenzhen Institutes of Advanced Technology, Shenzhen, China.,Joint Engineering Research Center for Health Big Data Intelligent Analysis Technology, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen, China
| | - Bin Zhou
- State Key Lab of Cardiovascular Disease, Fuwai Hospital, National Center for Cardiovascular Diseases, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China
| | - Ye Li
- Chinese Academy of Sciences Key Laboratory for Health Informatics, Shenzhen Institutes of Advanced Technology, Shenzhen, China.,Joint Engineering Research Center for Health Big Data Intelligent Analysis Technology, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen, China
| | - Min Tang
- State Key Lab of Cardiovascular Disease, Fuwai Hospital, National Center for Cardiovascular Diseases, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China
| | - Fen Miao
- Chinese Academy of Sciences Key Laboratory for Health Informatics, Shenzhen Institutes of Advanced Technology, Shenzhen, China.,Joint Engineering Research Center for Health Big Data Intelligent Analysis Technology, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen, China
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10
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Morales J, Herrera Á, Herrera LM, Lemos JD, Casanova ME, Badiel M. Acuerdo inter- e intraobservador de la cuantificación del ángulo QRS-T espacial calculado por el método de transformación visual. Estudio piloto. REVISTA COLOMBIANA DE CARDIOLOGÍA 2020. [DOI: 10.1016/j.rccar.2018.11.002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022] Open
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11
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Rjoob K, Bond R, Finlay D, McGilligan V, Leslie SJ, Iftikhar A, Guldenring D, Rababah A, Knoery C, McShane A, Peace A. Data driven feature selection and machine learning to detect misplaced V1 and V2 chest electrodes when recording the 12‑lead electrocardiogram. J Electrocardiol 2019; 57:39-43. [DOI: 10.1016/j.jelectrocard.2019.08.017] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2019] [Revised: 08/12/2019] [Accepted: 08/22/2019] [Indexed: 10/26/2022]
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12
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Tekin Tak B, Cay S, Ekizler FA, Ozcan Cetin EH, Pamukcu HE, Kafes H, Ulvan N, Ozeke O, Ozcan F, Topaloglu S, Aras D. Fragmented QRS as a candidate marker for left ventricular nonrecovery in patients with peripartum cardiomyopathy. Ann Noninvasive Electrocardiol 2019; 25:e12708. [PMID: 31587432 PMCID: PMC7358786 DOI: 10.1111/anec.12708] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/04/2019] [Accepted: 09/14/2019] [Indexed: 12/11/2022] Open
Abstract
BACKGROUND Fragmented QRS (fQRS) complex, with various morphology, has been recently described as a diagnostic criterion of several cardiac diseases. However, there are little data regarding the prognostic role of fQRS in peripartum cardiomyopathy (PPCM) patients. We aimed to investigate the effect of fQRS on predicting left ventricular (LV) nonrecovery in patients with peripartum cardiomyopathy (PPCM). METHODS Ninety patients (mean age: 34.7 ± 6.5 years) with the diagnosis of PPCM were analyzed retrospectively. The median follow-up period of was 67.0 (12.0-192.0) months. Fragmented QRS was defined as the presence of various RSR' patterns (QRS duration < 120 ms) with or without Q wave, which include an additional R wave (R' prime) or notching of the R wave or S wave, or the presence of more than one R' (fragmentation) without typical bundle branch block. Recovery of LV function was defined as the presence of LV ejection fraction (EF) >45%. RESULTS Of the patients, 54 (60%) did not recover LV function at the last follow-up visit (nonrecovery group), while 36 of the patients (40%) exhibited LV recovery (recovery group). LV ejection fraction (EF) and fQRS were identified as independent predictors of LV nonrecovery in patients with PPCM (odds ratio OR: 5.546, 95% confidence interval CI: 0.792-0.979, p = .019 and OR: 5.986, 95% CI: 1.313-11.787, p = .014, respectively). CONCLUSION Our data firstly indicated that presence of fQRS was a significant predictor of LV nonrecovery in patients with PPCM. The fQRS might assist in identifying high-risk patients.
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Affiliation(s)
- Bahar Tekin Tak
- Department of Cardiology, University of Health Sciences, Ankara City Hospital, Ankara, Turkey
| | - Serkan Cay
- Department of Cardiology, University of Health Sciences, Ankara City Hospital, Ankara, Turkey
| | - Firdevs Aysenur Ekizler
- Department of Cardiology, University of Health Sciences, Ankara City Hospital, Ankara, Turkey
| | - Elif Hande Ozcan Cetin
- Department of Cardiology, University of Health Sciences, Ankara City Hospital, Ankara, Turkey
| | - Hilal Erken Pamukcu
- Department of Cardiology, Dışkapı Education and Research Hospital, Health Sciences University Ankara, Turkey
| | - Habibe Kafes
- Department of Cardiology, University of Health Sciences, Ankara City Hospital, Ankara, Turkey
| | - Nedret Ulvan
- Department of Cardiology, University of Health Sciences, Ankara City Hospital, Ankara, Turkey
| | - Ozcan Ozeke
- Department of Cardiology, University of Health Sciences, Ankara City Hospital, Ankara, Turkey
| | - Firat Ozcan
- Department of Cardiology, University of Health Sciences, Ankara City Hospital, Ankara, Turkey
| | - Serkan Topaloglu
- Department of Cardiology, University of Health Sciences, Ankara City Hospital, Ankara, Turkey
| | - Dursun Aras
- Department of Cardiology, University of Health Sciences, Ankara City Hospital, Ankara, Turkey
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13
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Adler-Neal AL, Waugh CE, Garland EL, Shaltout HA, Diz DI, Zeidan F. The Role of Heart Rate Variability in Mindfulness-Based Pain Relief. THE JOURNAL OF PAIN 2019; 21:306-323. [PMID: 31377215 DOI: 10.1016/j.jpain.2019.07.003] [Citation(s) in RCA: 37] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Received: 06/07/2018] [Revised: 06/24/2019] [Accepted: 07/27/2019] [Indexed: 12/30/2022]
Abstract
Mindfulness meditation is a self-regulatory practice premised on sustaining nonreactive awareness of arising sensory events that reliably reduces pain. Yet, the specific analgesic mechanisms supporting mindfulness have not been comprehensively disentangled from the potential nonspecific factors supporting this technique. Increased parasympathetic nervous system (PNS) activity is associated with pain relief corresponding to a number of cognitive manipulations. However, the relationship between the PNS and mindfulness-based pain attenuation remains unknown. The primary objective of the present study was to determine the role of high-frequency heart rate variability (HF HRV), a marker of PNS activity, during mindfulness-based pain relief as compared to a validated, sham-mindfulness meditation technique that served as a breathing-based control. Sixty-two healthy volunteers (31 females; 31 males) were randomized to a 4-session (25 min/session) mindfulness or sham-mindfulness training regimen. Before and after each group's respective training, participants were administered noxious (49°C) and innocuous (35°C) heat to the right calf. HF HRV and respiration rate were recorded during thermal stimulation and pain intensity and unpleasantness ratings were collected after each stimulation series. The primary analysis revealed that during mindfulness meditation, higher HF HRV was more strongly associated with lower pain unpleasantness ratings when compared to sham-mindfulness meditation (B = -.82, P = .04). This finding is in line with the prediction that mindfulness-based meditation engages distinct mechanisms from sham-mindfulness meditation to reduce pain. However, the same prediction was not confirmed for pain intensity ratings (B = -.41). Secondary analyses determined that mindfulness and sham-mindfulness meditation similarly reduced pain ratings, decreased respiration rate, and increased HF HRV (between group ps < .05). More mechanistic work is needed to reliably determine the role of parasympathetic activation in mindfulness-based pain relief as compared to other meditative techniques. Perspective: Mindfulness has been shown to engage multiple mechanisms to reduce pain. The present study extends on this work to show that higher HRV is associated with mindfulness-induced reductions in pain unpleasantness, but not pain intensity ratings, when compared to sham-mindfulness meditation. These findings warrant further investigation into the mechanisms engaged by mindfulness as compared to placebo.
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Affiliation(s)
- Adrienne L Adler-Neal
- Department of Neurobiology and Anatomy, Wake Forest School of Medicine, Winston-Salem, North Carolina
| | - Christian E Waugh
- Department of Psychology, Wake Forest University, Winston-Salem, North Carolina
| | - Eric L Garland
- College of Social Work & Center on Mindfulness and Integrative Health Intervention Development, University of Utah, Salt Lake City, Utah
| | - Hossam A Shaltout
- Department of Surgery/Hypertension and Vascular Research, Cardiovascular Sciences Center, Winston-Salem, North Carolina; Department of Obstetrics and Gynecology, Wake Forest School of Medicine, Winston-Salem, North Carolina
| | - Debra I Diz
- Department of Surgery/Hypertension and Vascular Research, Cardiovascular Sciences Center, Winston-Salem, North Carolina
| | - Fadel Zeidan
- Department of Neurobiology and Anatomy, Wake Forest School of Medicine, Winston-Salem, North Carolina; Department of Anesthesiology, University of California San Diego, San Diego, California.
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14
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Valentim Gonçalves A, Pereira-da-Silva T, Galrinho A, Rio P, Moura Branco L, Soares R, Feliciano J, Ilhão Moreira R, Cruz Ferreira R. Antiarrhythmic Effect of Sacubitril-Valsartan: Cause or Consequence of Clinical Improvement? J Clin Med 2019; 8:jcm8060869. [PMID: 31216679 PMCID: PMC6616876 DOI: 10.3390/jcm8060869] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2019] [Revised: 06/01/2019] [Accepted: 06/14/2019] [Indexed: 12/11/2022] Open
Abstract
Sacubitril/Valsartan (LCZ696) reduced sudden cardiac death in the PARADIGM-HF trial. However, the mechanism by which LCZ696 reduces ventricular arrhythmias remains unclear. The aim of this study was to compare electrocardiographic (ECG) parameters and mechanical dispersion index, assessed by left ventricular (LV) global longitudinal strain (GLS), before and after LCZ696 therapy. We prospectively evaluated chronic Heart Failure (HF) patients with LV ejection fraction ≤40%, despite optimal medical and device therapy, in which LCZ696 therapy was started, while no additional HF treatment was expected to change. ECG and transthoracic echocardiographic data were gathered in the week before starting LCZ696 and at six months of therapy. A semiautomated analysis of LV GLS was performed and mechanical dispersion index was defined as the standard deviation from 16 time intervals corresponding to each LV segment. Of the 42 patients, 35 completed the six month follow-up, since two patients died and five discontinued treatment for adverse events. QTc interval (451.9 vs. 426.0 ms, p < 0.001), QRS duration (125.1 vs. 120.8 ms, p = 0.033) and mechanical dispersion index (88.4 vs. 78.1 ms, p = 0.036) were significantly reduced at six months. LCZ696 therapy is associated with a reduction in QTc interval, QRS duration and mechanical dispersion index as assessed by LV GLS.
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Affiliation(s)
- António Valentim Gonçalves
- Department of Cardiology, Hospital de Santa Marta, Centro Hospitalar de Lisboa Central, 1169-024 Lisbon, Portugal.
| | - Tiago Pereira-da-Silva
- Department of Cardiology, Hospital de Santa Marta, Centro Hospitalar de Lisboa Central, 1169-024 Lisbon, Portugal.
| | - Ana Galrinho
- Department of Cardiology, Hospital de Santa Marta, Centro Hospitalar de Lisboa Central, 1169-024 Lisbon, Portugal.
| | - Pedro Rio
- Department of Cardiology, Hospital de Santa Marta, Centro Hospitalar de Lisboa Central, 1169-024 Lisbon, Portugal.
| | - Luísa Moura Branco
- Department of Cardiology, Hospital de Santa Marta, Centro Hospitalar de Lisboa Central, 1169-024 Lisbon, Portugal.
| | - Rui Soares
- Department of Cardiology, Hospital de Santa Marta, Centro Hospitalar de Lisboa Central, 1169-024 Lisbon, Portugal.
| | - Joana Feliciano
- Department of Cardiology, Hospital de Santa Marta, Centro Hospitalar de Lisboa Central, 1169-024 Lisbon, Portugal.
| | - Rita Ilhão Moreira
- Department of Cardiology, Hospital de Santa Marta, Centro Hospitalar de Lisboa Central, 1169-024 Lisbon, Portugal.
| | - Rui Cruz Ferreira
- Department of Cardiology, Hospital de Santa Marta, Centro Hospitalar de Lisboa Central, 1169-024 Lisbon, Portugal.
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15
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Santilli RA, Porteiro Vázquez DM, Gerou-Ferriani M, Lombardo SF, Perego M. Development and assessment of a novel precordial lead system for accurate detection of right atrial and ventricular depolarization in dogs with various thoracic conformations. Am J Vet Res 2019; 80:358-368. [PMID: 30919674 DOI: 10.2460/ajvr.80.4.358] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
OBJECTIVE To assess recording accuracy of right atrial and ventricular depolarization during 12-lead ECG when precordial lead V1 was positioned at each of 5 locations on the thorax of dogs with various thoracic conformations. ANIMALS 60 healthy client-owned dogs. PROCEDURES 20 dogs were allocated to each of 3 groups (brachymorphic, mesomorphic, or dolichomorphic) on the basis of thoracic conformation. Each dog remained unsedated and was positioned in right lateral recumbency for a series of five 12-lead surface ECGs, with V1 located adjacent to the sternum in the fifth intercostal space (ICS; control), at the costochondral junction (CCJ) of the right first ICS (1st-R), at the CCJ of the right third ICS, at the right third ICS where the thorax was the widest, and at the CCJ of the left first ICS. Electrocardiographic variables were compared among the 5 ECG tracings. RESULTS When V1 was at the control location, the P wave was positive for all dogs; however, consistent recording of right atrial and ventricular depolarization (ie, R wave-to-S wave ratio [R/S] < 1) occurred more frequently for brachymorphic dogs (16/20) than for dolichomorphic (7/20) and mesomorphic (6/20) dogs. When V1 was at the 1st-R location, the P wave was negative for most dogs, and R/S was < 1 for the majority of dogs in the brachymorphic (19/20), mesomorphic (17/20), and dolichomorphic (16/20) groups. The median R/S for V1 at the 1st-R location was significantly lower than that for the other 4 V1 locations. CONCLUSIONS AND CLINICAL RELEVANCE Results indicated that placement of V1 at the 1st-R location provided correct evaluation of right atrial and ventricular depolarization in most dogs regardless of thoracic conformation.
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16
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Herbsleb M, Schumann A, Lehmann L, Gabriel HHW, Bär KJ. Cardio-Respiratory Fitness and Autonomic Function in Patients with Major Depressive Disorder. Front Psychiatry 2019; 10:980. [PMID: 32116813 PMCID: PMC7011194 DOI: 10.3389/fpsyt.2019.00980] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/08/2019] [Accepted: 12/10/2019] [Indexed: 11/27/2022] Open
Abstract
Patients with major depressive disorder (MDD) have an augmented risk of cardiovascular morbidity and mortality. Although a link between depression and autonomic dysfunction as well as reduced cardio-respiratory fitness (CRF) is well documented, the underlying cause is a matter of debate. Therefore, we studied the interplay between autonomic function, body composition and severity of the disease to disentangle possible physiological factors influencing the assumed lack of CRF in MDD patients. We investigated seventeen patients suffering from MDD and seventeen control subjects matched with respect to age, sex, body-mass-index, and smoking habits. A resting baseline assessment and a cardiopulmonary exercise test including a prolonged recovery period were performed to study autonomic function (i.e., heart rate responses and heart rate variability) during rest, exercise and recovery as well as CRF. Most investigated autonomic indices were significantly different at rest, during exercise as well as during recovery indicating altered autonomic modulation. Nevertheless, none of our participants was classified as chronotropically incompetent. As expected, a reduced CRF (i.e., peak oxygen uptake and peak power output, p < 0.01) was observed in patients compared to controls. In addition, a correlation of baseline heart rate and of heart rate during recovery with the ventilatory threshold 1 (p < 0.05) was found in patients only, indicating a relation to the lack of CRF. Furthermore, we observed a positive correlation of the severity of the disease with the weekly sitting time (p < 0.01) as well as a negative correlation with the activity time in the intensity domain walking (p < 0.001) and with the total score of the International Physical Activity Questionnaire (p < 0.01) for patients. This study shows that patients with MDD have altered autonomic function not only during resting conditions but also during exercise as well as recovery from exercise. Intervention studies are needed to evaluate how the described autonomic alterations can be influenced by increasing CRF due to appropriate exercise training programs.
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Affiliation(s)
- Marco Herbsleb
- Department of Sports Medicine and Health Promotion, Friedrich-Schiller-University, Jena, Germany.,Psychiatric Brain and Body Research Group, Department of Psychosomatic Medicine, University Hospital, Jena, Germany
| | - Andy Schumann
- Psychiatric Brain and Body Research Group, Department of Psychosomatic Medicine, University Hospital, Jena, Germany
| | - Luisa Lehmann
- Psychiatric Brain and Body Research Group, Department of Psychosomatic Medicine, University Hospital, Jena, Germany
| | - Holger H W Gabriel
- Department of Sports Medicine and Health Promotion, Friedrich-Schiller-University, Jena, Germany
| | - Karl-Jürgen Bär
- Psychiatric Brain and Body Research Group, Department of Psychosomatic Medicine, University Hospital, Jena, Germany
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17
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Hoevelmann J, Viljoen CA, Manning K, Baard J, Hahnle L, Ntsekhe M, Bauersachs J, Sliwa K. The prognostic significance of the 12-lead ECG in peripartum cardiomyopathy. Int J Cardiol 2018; 276:177-184. [PMID: 30497895 DOI: 10.1016/j.ijcard.2018.11.008] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/10/2018] [Revised: 10/24/2018] [Accepted: 11/05/2018] [Indexed: 01/13/2023]
Abstract
BACKGROUND Peripartum cardiomyopathy (PPCM) is an important cause of pregnancy-associated heart failure, which appears in previously healthy women towards the end of pregnancy or within five months following delivery. Although the ECG is widely used in clinical practice, its prognostic value has not been established in PPCM. METHODS We analysed 12-lead ECGs of patients with PPCM, taken at index presentation and follow-up visits at 6 and 12 months. Poor outcome was determined by the composite endpoint of death, readmission, NYHA functional class III/IV or left ventricular ejection fraction (LVEF) of ≤35% at follow-up. RESULTS This cohort of 66 patients had a median age of 28.59 (IQR 25.43-32.19). The median LVEF at presentation (33%, IQR 25-40) improved significantly at follow-up (LVEF 49%, IQR 38-55, P < 0.001 at 6 months; 52% IQR 38-57, P = 0.001 at 12 months). Poor outcome occurred in 27.91% at 6 months and 41.18% at 1 year. Whereas sinus tachycardia at baseline was an independent predictor of poor outcome at 12 months (OR 6.56, 95% CI 1.17-20.41, P = 0.030), sinus arrhythmia was associated with event free survival (log rank P = 0.013). T wave inversion was associated with an LVEF ≤35% at presentation (P = 0.038), but did not predict poor outcome. A prolonged QTc interval at presentation (found in almost half of the cohort) was an independent predictor of poor outcome at 6 months (OR 6.34, 95% CI 1.06-37.80, P = 0.043). CONCLUSION(S) A prolonged QTc and sinus tachycardia at baseline were independent predictors of poor outcome in PPCM at 6 months and 1 year respectively.
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Affiliation(s)
- J Hoevelmann
- University of Cape Town, Hatter Institute for Cardiovascular Research in Africa, Cape Town, South Africa; Hannover Medical School, Department of Cardiology and Angiology, Hannover, Germany
| | - C A Viljoen
- University of Cape Town, Hatter Institute for Cardiovascular Research in Africa, Cape Town, South Africa; University of Cape Town, Division of Cardiology, Cape Town, South Africa
| | - K Manning
- University of Cape Town, Department of Medicine, Cape Town, South Africa
| | - J Baard
- University of Cape Town, Hatter Institute for Cardiovascular Research in Africa, Cape Town, South Africa
| | - L Hahnle
- University of Cape Town, Hatter Institute for Cardiovascular Research in Africa, Cape Town, South Africa; University of Cape Town, Division of Cardiology, Cape Town, South Africa
| | - M Ntsekhe
- University of Cape Town, Division of Cardiology, Cape Town, South Africa
| | - J Bauersachs
- Hannover Medical School, Department of Cardiology and Angiology, Hannover, Germany
| | - K Sliwa
- University of Cape Town, Hatter Institute for Cardiovascular Research in Africa, Cape Town, South Africa.
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18
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Shao M, Bin G, Wu S, Bin G, Huang J, Zhou Z. Detection of atrial fibrillation from ECG recordings using decision tree ensemble with multi-level features. Physiol Meas 2018; 39:094008. [DOI: 10.1088/1361-6579/aadf48] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
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19
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Abstract
Diagnostic error may be the largest unaddressed patient safety concern in the United States, responsible for an estimated 40,000-80,000 deaths annually. With the electronic health record (EHR) now in near universal use, the goal of this narrative review is to synthesize evidence and opinion regarding the impact of the EHR and health care information technology (health IT) on the diagnostic process and its outcomes. We consider the many ways in which the EHR and health IT facilitate diagnosis and improve the diagnostic process, and conversely the major ways in which it is problematic, including the unintended consequences that contribute to diagnostic error and sometimes patient deaths. We conclude with a summary of suggestions for improving the safety and safe use of these resources for diagnosis in the future.
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Affiliation(s)
| | - Colene Byrne
- RTI International Research Triangle Park, NC, USA
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20
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Pereira H, Jackson TA, Sieniewicz B, Gould J, Yao C, Niederer S, Rinaldi CA. Non-invasive electrophysiological assessment of the optimal configuration of quadripolar lead vectors on ventricular activation times. J Electrocardiol 2018; 51:714-719. [PMID: 29997019 DOI: 10.1016/j.jelectrocard.2018.05.006] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2018] [Revised: 04/19/2018] [Accepted: 05/10/2018] [Indexed: 10/16/2022]
Abstract
BACKGROUND Cardiac resynchronization therapy (CRT) is now generally delivered via quadripolar leads. Assessment of the effect of different vector programs from quadripolar leads on ventricular activation can be now done using non-invasive electrocardiographic mapping (ECM). MATERIAL AND METHODS In nineteen patients with quadripolar LV leads, activation maps were constructed. The total ventricular activation time (TVaT) and the time for the bulk of ventricular activation (VaT10-90) were calculated. RESULTS CRT delivered via a quadripolar lead significantly reduced TVaT and VaT10-90 by a mean of 16 ms and 31 ms, respectively, compared to baseline. There was a marked reduction in ventricular activation between the most and least synchronous vectors: 28% difference in baseline TVaT and 37% difference in VaT10-90. CONCLUSION Changes in the configuration of an LV quadripolar lead significantly affected ventricular activation timings in both ischaemic and non-ischaemic subjects. This suggests that programming of the optimal pacing vector may need to be individually tailored.
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Affiliation(s)
- Helder Pereira
- Division of Imaging Sciences and Biomedical Engineering, King's College London, London, United Kingdom.
| | - Tom A Jackson
- Division of Imaging Sciences and Biomedical Engineering, King's College London, London, United Kingdom; Cardiovascular Department, Guy's and St Thomas' NHS Foundation Trust, London, United Kingdom
| | - Benjamin Sieniewicz
- Division of Imaging Sciences and Biomedical Engineering, King's College London, London, United Kingdom; Cardiovascular Department, Guy's and St Thomas' NHS Foundation Trust, London, United Kingdom
| | - Justin Gould
- Division of Imaging Sciences and Biomedical Engineering, King's College London, London, United Kingdom; Cardiovascular Department, Guy's and St Thomas' NHS Foundation Trust, London, United Kingdom
| | | | - Steven Niederer
- Division of Imaging Sciences and Biomedical Engineering, King's College London, London, United Kingdom
| | - Christopher A Rinaldi
- Division of Imaging Sciences and Biomedical Engineering, King's College London, London, United Kingdom; Cardiovascular Department, Guy's and St Thomas' NHS Foundation Trust, London, United Kingdom
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21
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Finlay D, Guldenring D, Breen C, Bond R. Data Driven Computer Simulation to Analyse an ECG Limb Lead System Used in Connected Health Environments. Methods Inf Med 2018; 55:258-65. [DOI: 10.3414/me15-01-0120] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2015] [Accepted: 02/10/2016] [Indexed: 11/09/2022]
Abstract
SummaryBackground: Recently under the Connected Health initiative, researchers and small-medium engineering companies have developed Electrocardiogram (ECG) monitoring devices that incorporate non-standard limb electrode positions, which we have named the Central Einthoven (CE) configuration.Objectives: The main objective of this study is to compare ECG signals recorded from the CE configuration with those recorded from the recommended Mason-Likar (ML) configuration.Methods: This study involved extracting two different sets of ECG limb leads from each patient to compare the difference in the signals. This was done using computer simulation that is driven by body surface potential maps. This simulator was developed to facilitate this experiment but it can also be used to test similar hypotheses. This study included, (a) 176 ECGs derived using the ML electrode positions and (b) the 176 corresponding ECGs derived using the CE electrode positions. The signals from these ECGs were compared using root mean square error (RMSE), Pearson product-moment correlation coefficient (r) and similarity coefficient (SC). We also investigated whether the CE configuration influences the calculated mean cardiac axis. The top 10 cases where the ECGs were significantly different between the two configurations were visually compared by an ECG interpreter.Results: We found that the leads aVL, III and aVF are most affected when using the CE configuration. The absolute mean difference between the QRS axes from both configurations was 28° (SD = 37°). In addition, we found that in 82% of the QRS axes calculated from the CE configuration was more rightward in comparison to the QRS axes derived from the ML configuration. Also, we found that there is an 18% chance that a misleading axis will be located in the inferior right quadrant when using the CE approach. Thus, the CE configuration can emulate right axis deviation. The clinician visually identified 6 out of 10 cases where the CE based ECG yielded clinical differences that could result in false positives.Conclusions: The CE configuration will not yield the same diagnostic accuracy for diagnosing pathologies that rely on current amplitude criteria. Conversely, rhythm lead II was not significantly affected, which supports the use of the CE approach for assessing cardiac rhythm only. Any computerised analysis of the CE based ECG will need to take these findings into consideration.
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22
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Constructing a Guided Filter by Exploiting the Butterworth Filter for ECG Signal Enhancement. J Med Biol Eng 2017. [DOI: 10.1007/s40846-017-0350-1] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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23
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Steinberg JS, Varma N, Cygankiewicz I, Aziz P, Balsam P, Baranchuk A, Cantillon DJ, Dilaveris P, Dubner SJ, El-Sherif N, Krol J, Kurpesa M, La Rovere MT, Lobodzinski SS, Locati ET, Mittal S, Olshansky B, Piotrowicz E, Saxon L, Stone PH, Tereshchenko L, Turitto G, Wimmer NJ, Verrier RL, Zareba W, Piotrowicz R. 2017 ISHNE-HRS expert consensus statement on ambulatory ECG and external cardiac monitoring/telemetry. Heart Rhythm 2017; 14:e55-e96. [DOI: 10.1016/j.hrthm.2017.03.038] [Citation(s) in RCA: 159] [Impact Index Per Article: 22.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/23/2017] [Indexed: 12/18/2022]
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24
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Everett TH, Doytchinova A, Cha YM, Chen PS. Recording sympathetic nerve activity from the skin. Trends Cardiovasc Med 2017; 27:463-472. [PMID: 28619579 DOI: 10.1016/j.tcm.2017.05.003] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/09/2017] [Revised: 05/02/2017] [Accepted: 05/03/2017] [Indexed: 01/09/2023]
Abstract
Sympathetic tone is important in cardiac arrhythmogenesis; however, methods to estimate sympathetic tone are either invasive or require proper sinus node function that may be abnormal in disease states. Because of the direct and extensive connections among various nerve structures, it is possible for the sympathetic nerves in the various structures to activate simultaneously. Therefore, we hypothesized that nerve activity can be recorded from the skin and it can be used to estimate the cardiac sympathetic tone. Preclinical studies in canines demonstrated that nerve activity is detectable using conventional ECG electrodes and can be used to estimate cardiac sympathetic tone. Subsequent clinical studies further supported this concept. In addition to studying the autonomic mechanisms of cardiac arrhythmia, these new methods may have broad application in studying both cardiac and non-cardiac diseases.
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Affiliation(s)
- Thomas H Everett
- Krannert Institute of Cardiology and Division of Cardiology, Department of Medicine, Indiana University School of Medicine, Indianapolis, IN.
| | - Anisiia Doytchinova
- Krannert Institute of Cardiology and Division of Cardiology, Department of Medicine, Indiana University School of Medicine, Indianapolis, IN
| | - Yong-Mei Cha
- Division of Cardiovascular Diseases, Mayo Clinic, Rochester, MN
| | - Peng-Sheng Chen
- Krannert Institute of Cardiology and Division of Cardiology, Department of Medicine, Indiana University School of Medicine, Indianapolis, IN
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Steinberg JS, Varma N, Cygankiewicz I, Aziz P, Balsam P, Baranchuk A, Cantillon DJ, Dilaveris P, Dubner SJ, El‐Sherif N, Krol J, Kurpesa M, La Rovere MT, Lobodzinski SS, Locati ET, Mittal S, Olshansky B, Piotrowicz E, Saxon L, Stone PH, Tereshchenko L, Turitto G, Wimmer NJ, Verrier RL, Zareba W, Piotrowicz R. 2017 ISHNE-HRS expert consensus statement on ambulatory ECG and external cardiac monitoring/telemetry. Ann Noninvasive Electrocardiol 2017; 22:e12447. [PMID: 28480632 PMCID: PMC6931745 DOI: 10.1111/anec.12447] [Citation(s) in RCA: 38] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/03/2017] [Accepted: 02/06/2017] [Indexed: 02/06/2023] Open
Abstract
Ambulatory ECG (AECG) is very commonly employed in a variety of clinical contexts to detect cardiac arrhythmias and/or arrhythmia patterns which are not readily obtained from the standard ECG. Accurate and timely characterization of arrhythmias is crucial to direct therapies that can have an important impact on diagnosis, prognosis or patient symptom status. The rhythm information derived from the large variety of AECG recording systems can often lead to appropriate and patient-specific medical and interventional management. The details in this document provide background and framework from which to apply AECG techniques in clinical practice, as well as clinical research.
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Affiliation(s)
- Jonathan S. Steinberg
- Heart Research Follow‐up ProgramUniversity of Rochester School of Medicine & DentistryRochesterNYUSA
- The Summit Medical GroupShort HillsNJUSA
| | - Niraj Varma
- Cardiac Pacing & ElectrophysiologyDepartment of Cardiovascular MedicineCleveland ClinicClevelandOHUSA
| | | | - Peter Aziz
- Cardiac Pacing & ElectrophysiologyDepartment of Cardiovascular MedicineCleveland ClinicClevelandOHUSA
| | - Paweł Balsam
- 1st Department of CardiologyMedical University of WarsawWarsawPoland
| | | | - Daniel J. Cantillon
- Cardiac Pacing & ElectrophysiologyDepartment of Cardiovascular MedicineCleveland ClinicClevelandOHUSA
| | - Polychronis Dilaveris
- 1st Department of CardiologyUniversity of Athens Medical SchoolHippokration HospitalAthensGreece
| | - Sergio J. Dubner
- Arrhythmias and Electrophysiology ServiceClinic and Maternity Suizo Argentina and De Los Arcos Private HospitalBuenos AiresArgentina
| | | | - Jaroslaw Krol
- Department of Cardiology, Hypertension and Internal Medicine2nd Medical Faculty Medical University of WarsawWarsawPoland
| | - Malgorzata Kurpesa
- Department of CardiologyMedical University of LodzBieganski HospitalLodzPoland
| | | | | | - Emanuela T. Locati
- Cardiovascular DepartmentCardiology, ElectrophysiologyOspedale NiguardaMilanoItaly
| | | | | | - Ewa Piotrowicz
- Telecardiology CenterInstitute of CardiologyWarsawPoland
| | - Leslie Saxon
- University of Southern CaliforniaLos AngelesCAUSA
| | - Peter H. Stone
- Vascular Profiling Research GroupCardiovascular DivisionHarvard Medical SchoolBrigham & Women's HospitalBostonMAUSA
| | - Larisa Tereshchenko
- Knight Cardiovascular InstituteOregon Health & Science UniversityPortlandORUSA
- Cardiovascular DivisionJohns Hopkins University School of MedicineBaltimoreMDUSA
| | - Gioia Turitto
- Weill Cornell Medical CollegeElectrophysiology ServicesNew York Methodist HospitalBrooklynNYUSA
| | - Neil J. Wimmer
- Vascular Profiling Research GroupCardiovascular DivisionHarvard Medical SchoolBrigham & Women's HospitalBostonMAUSA
| | - Richard L. Verrier
- Division of Cardiovascular MedicineBeth Israel Deaconess Medical CenterHarvard Medical SchoolHarvard‐Thorndike Electrophysiology InstituteBostonMAUSA
| | - Wojciech Zareba
- Heart Research Follow‐up ProgramUniversity of Rochester School of Medicine & DentistryRochesterNYUSA
| | - Ryszard Piotrowicz
- Department of Cardiac Rehabilitation and Noninvasive ElectrocardiologyNational Institute of CardiologyWarsawPoland
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Dr. Galen Wagner (1939-2016) as an Academic Writer: An Overview of his Peer-reviewed Scientific Publications. J Electrocardiol 2017; 50:47-73. [DOI: 10.1016/j.jelectrocard.2016.11.008] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
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Doytchinova A, Hassel JL, Yuan Y, Lin H, Yin D, Adams D, Straka S, Wright K, Smith K, Wagner D, Shen C, Salanova V, Meshberger C, Chen LS, Kincaid JC, Coffey AC, Wu G, Li Y, Kovacs RJ, Everett TH, Victor R, Cha YM, Lin SF, Chen PS. Simultaneous noninvasive recording of skin sympathetic nerve activity and electrocardiogram. Heart Rhythm 2016; 14:25-33. [PMID: 27670627 DOI: 10.1016/j.hrthm.2016.09.019] [Citation(s) in RCA: 83] [Impact Index Per Article: 10.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/08/2016] [Indexed: 11/18/2022]
Abstract
BACKGROUND Sympathetic nerve activity is important to cardiac arrhythmogenesis. OBJECTIVE The purpose of this study was to develop a method for simultaneous noninvasive recording of skin sympathetic nerve activity (SKNA) and electrocardiogram (ECG) using conventional ECG electrodes. This method (neuECG) can be used to adequately estimate sympathetic tone. METHODS We recorded neuECG signals from the skin of 56 human subjects. The signals were low-pass filtered to show the ECG and high-pass filtered to show nerve activity. Protocol 1 included 12 healthy volunteers who underwent cold water pressor test and Valsalva maneuver. Protocol 2 included 19 inpatients with epilepsy but without known heart diseases monitored for 24 hours. Protocol 3 included 22 patients admitted with electrical storm and monitored for 39.0 ± 28.2 hours. Protocol 4 included 3 patients who underwent bilateral stellate ganglion blockade with lidocaine injection. RESULTS In patients without heart diseases, spontaneous nerve discharges were frequently observed at baseline and were associated with heart rate acceleration. SKNA recorded from chest leads (V1-V6) during cold water pressor test and Valsalva maneuver (protocol 1) was invariably higher than during baseline and recovery periods (P < .001). In protocol 2, the average SKNA correlated with heart rate acceleration (r = 0.73 ± 0.14, P < .05) and shortening of QT interval (P < .001). Among 146 spontaneous ventricular tachycardia episodes recorded in 9 patients of protocol 3, 106 episodes (73%) were preceded by SKNA within 30 seconds of onset. Protocol 4 showed that bilateral stellate ganglia blockade by lidocaine inhibited SKNA. CONCLUSION SKNA is detectable using conventional ECG electrodes in humans and may be useful in estimating sympathetic tone.
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Affiliation(s)
- Anisiia Doytchinova
- Krannert Institute of Cardiology and Division of Cardiology, Department of Medicine, Indiana University School of Medicine, Indianapolis, Indiana
| | - Jonathan L Hassel
- Krannert Institute of Cardiology and Division of Cardiology, Department of Medicine, Indiana University School of Medicine, Indianapolis, Indiana
| | - Yuan Yuan
- Krannert Institute of Cardiology and Division of Cardiology, Department of Medicine, Indiana University School of Medicine, Indianapolis, Indiana; Department of Cardiothoracic Surgery, Xinhua Hospital, Shanghai Jiaotong University School of Medicine, Shanghai, China
| | - Hongbo Lin
- Department of Biostatistics, Indiana University School of Medicine, Indianapolis, Indiana
| | - Dechun Yin
- Krannert Institute of Cardiology and Division of Cardiology, Department of Medicine, Indiana University School of Medicine, Indianapolis, Indiana; Department of Cardiology, the First Affiliated Hospital of Harbin Medical University, Harbin, China
| | - David Adams
- Krannert Institute of Cardiology and Division of Cardiology, Department of Medicine, Indiana University School of Medicine, Indianapolis, Indiana
| | - Susan Straka
- Krannert Institute of Cardiology and Division of Cardiology, Department of Medicine, Indiana University School of Medicine, Indianapolis, Indiana
| | - Keith Wright
- Krannert Institute of Cardiology and Division of Cardiology, Department of Medicine, Indiana University School of Medicine, Indianapolis, Indiana
| | - Kimberly Smith
- Krannert Institute of Cardiology and Division of Cardiology, Department of Medicine, Indiana University School of Medicine, Indianapolis, Indiana
| | - David Wagner
- Krannert Institute of Cardiology and Division of Cardiology, Department of Medicine, Indiana University School of Medicine, Indianapolis, Indiana
| | - Changyu Shen
- Department of Biostatistics, Indiana University School of Medicine, Indianapolis, Indiana
| | - Vicenta Salanova
- Department of Neurology, Indiana University School of Medicine, Indianapolis, Indiana
| | - Chad Meshberger
- Department of Neurology, Indiana University School of Medicine, Indianapolis, Indiana
| | - Lan S Chen
- Department of Neurology, Indiana University School of Medicine, Indianapolis, Indiana
| | - John C Kincaid
- Department of Neurology, Indiana University School of Medicine, Indianapolis, Indiana
| | - Arthur C Coffey
- Division of Cardiothoracic Surgery, Department of Surgery, Indiana University School of Medicine, Indianapolis, Indiana
| | - Gang Wu
- Division of Cardiovascular Diseases, Department of Medicine, Mayo Clinic, Rochester, Minnesota; Department of Cardiology, Renmin Hospital of Wuhan University, Wuhan, China
| | - Yan Li
- Department of Geriatrics, Shengjing Hospital, China Medical University, Shenyang, China
| | - Richard J Kovacs
- Krannert Institute of Cardiology and Division of Cardiology, Department of Medicine, Indiana University School of Medicine, Indianapolis, Indiana
| | - Thomas H Everett
- Krannert Institute of Cardiology and Division of Cardiology, Department of Medicine, Indiana University School of Medicine, Indianapolis, Indiana
| | - Ronald Victor
- Cedars-Sinai Heart Institute/Hypertension Center(,) Los Angeles, California
| | - Yong-Mei Cha
- Division of Cardiovascular Diseases, Department of Medicine, Mayo Clinic, Rochester, Minnesota
| | - Shien-Fong Lin
- Krannert Institute of Cardiology and Division of Cardiology, Department of Medicine, Indiana University School of Medicine, Indianapolis, Indiana; Institute of Biomedical Engineering, National Chiao-Tung University, Hsin-Chu, Taiwan
| | - Peng-Sheng Chen
- Krannert Institute of Cardiology and Division of Cardiology, Department of Medicine, Indiana University School of Medicine, Indianapolis, Indiana.
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Tse ZTH, Dumoulin CL, Clifford GD, Schweitzer J, Qin L, Oster J, Jerosch-Herold M, Kwong RY, Michaud G, Stevenson WG, Schmidt EJ. A 1.5T MRI-conditional 12-lead electrocardiogram for MRI and intra-MR intervention. Magn Reson Med 2015; 71:1336-47. [PMID: 23580148 DOI: 10.1002/mrm.24744] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
PURPOSE High-fidelity 12-lead electrocardiogram (ECG) is important for physiological monitoring of patients during MR-guided intervention and cardiac MRI. Issues in obtaining noncorrupted ECGs inside MRI include a superimposed magneto-hydro-dynamic voltage, gradient switching-induced voltages, and radiofrequency heating. These problems increase with magnetic field. The aim of this study is to develop and clinically validate a 1.5T MRI-conditional 12-lead ECG system. METHODS The system was constructed with transmission lines to reduce radiofrequency induction and switching circuits to remove induced voltages. Adaptive filters, trained by 12-lead measurements outside MRI and in two orientations inside MRI, were used to remove the magneto-hydro-dynamic voltage. The system was tested on 10 (one exercising) volunteers and four arrhythmia patients. RESULTS Switching circuits removed most imaging-induced voltages (residual noise <3% of the R-wave). Magneto-hydro-dynamic voltage removal provided intra-MRI ECGs that varied by <3.8% from those outside the MRI, preserving the true S-wave to T-wave segment. In premature ventricular contraction (PVC) patients, clean ECGs separated premature ventricular contraction and sinus rhythm beats. Measured heating was <1.5°C. The system reliably acquired multiphase (steady-state free precession) wall-motion-cine and phase-contrast-cine scans, including subjects in whom 4-lead gating failed. The system required a minimum repetition time of 4 ms to allow robust ECG processing. CONCLUSION High-fidelity intra-MRI 12-lead ECG is possible.
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Affiliation(s)
- Zion Tsz Ho Tse
- The University of Georgia, College of Engineering, Driftmier Engineering Center, 597 D. W. Brook Drive, Athens, GA 30602, USA
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Day K, Oliva I, Krupinski E, Marcus F. Identification of 4th intercostal space using sternal notch to xiphoid length for accurate electrocardiogram lead placement. J Electrocardiol 2015; 48:1058-61. [PMID: 26324175 DOI: 10.1016/j.jelectrocard.2015.08.019] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2015] [Indexed: 10/23/2022]
Abstract
OBJECTIVE Precordial ECG lead placement is difficult in obese patients with increased chest wall soft tissues due to inaccurate palpation of the intercostal spaces. We investigated whether the length of the sternum (distance between the sternal notch and xiphoid process) can accurately predict the location of the 4th intercostal space, which is the traditional location for V1 lead position. MATERIALS AND METHODS Fifty-five consecutive adult chest computed tomography examinations were reviewed for measurements. RESULTS The sternal notch to right 4th intercostal space distance was 67% of the sternal notch to xiphoid process length with an overall correlation of r=0.600 (p<0.001). CONCLUSION The above measurement may be utilized to locate the 4th intercostal space for accurate placement of the precordial electrodes in adults in whom the 4th intercostal space cannot be found by physical exam.
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Affiliation(s)
- Kevin Day
- Department of Medical Imaging, University of Arizona Medical Center, 1501N. Campbell Ave. PO Box 245067, Tucson, AZ.
| | - Isabel Oliva
- Department of Medical Imaging, University of Arizona Medical Center, 1501N. Campbell Ave. PO Box 245067, Tucson, AZ
| | - Elizabeth Krupinski
- Department of Medical Imaging, University of Arizona Medical Center, 1501N. Campbell Ave. PO Box 245067, Tucson, AZ
| | - Frank Marcus
- Department of Medicine, University of Arizona Medical Center, 1501N. Campbell Ave. PO Box 245037, Tucson, AZ
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Rawstorn JC, Gant N, Warren I, Doughty RN, Lever N, Poppe KK, Maddison R. Measurement and Data Transmission Validity of a Multi-Biosensor System for Real-Time Remote Exercise Monitoring Among Cardiac Patients. JMIR Rehabil Assist Technol 2015; 2:e2. [PMID: 28582235 PMCID: PMC5454552 DOI: 10.2196/rehab.3633] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2014] [Revised: 12/18/2014] [Accepted: 12/19/2014] [Indexed: 01/19/2023] Open
Abstract
BACKGROUND Remote telemonitoring holds great potential to augment management of patients with coronary heart disease (CHD) and atrial fibrillation (AF) by enabling regular physiological monitoring during physical activity. Remote physiological monitoring may improve home and community exercise-based cardiac rehabilitation (exCR) programs and could improve assessment of the impact and management of pharmacological interventions for heart rate control in individuals with AF. OBJECTIVE Our aim was to evaluate the measurement validity and data transmission reliability of a remote telemonitoring system comprising a wireless multi-parameter physiological sensor, custom mobile app, and middleware platform, among individuals in sinus rhythm and AF. METHODS Participants in sinus rhythm and with AF undertook simulated daily activities, low, moderate, and/or high intensity exercise. Remote monitoring system heart rate and respiratory rate were compared to reference measures (12-lead ECG and indirect calorimeter). Wireless data transmission loss was calculated between the sensor, mobile app, and remote Internet server. RESULTS Median heart rate (-0.30 to 1.10 b∙min-1) and respiratory rate (-1.25 to 0.39 br∙min-1) measurement biases were small, yet statistically significant (all P≤.003) due to the large number of observations. Measurement reliability was generally excellent (rho=.87-.97, all P<.001; intraclass correlation coefficient [ICC]=.94-.98, all P<.001; coefficient of variation [CV]=2.24-7.94%), although respiratory rate measurement reliability was poor among AF participants (rho=.43, P<.001; ICC=.55, P<.001; CV=16.61%). Data loss was minimal (<5%) when all system components were active; however, instability of the network hosting the remote data capture server resulted in data loss at the remote Internet server during some trials. CONCLUSIONS System validity was sufficient for remote monitoring of heart and respiratory rates across a range of exercise intensities. Remote exercise monitoring has potential to augment current exCR and heart rate control management approaches by enabling the provision of individually tailored care to individuals outside traditional clinical environments.
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Affiliation(s)
- Jonathan C Rawstorn
- National Institute for Health Innovation, University of Auckland, Auckland, New Zealand
- Department of Sport and Exercise Science, University of Auckland, Auckland, New Zealand
| | - Nicholas Gant
- Department of Sport and Exercise Science, University of Auckland, Auckland, New Zealand
| | - Ian Warren
- Department of Computer Science, University of Auckland, Auckland, New Zealand
| | | | - Nigel Lever
- Department of Medicine, University of Auckland, Auckland, New Zealand
| | - Katrina K Poppe
- Department of Medicine, University of Auckland, Auckland, New Zealand
| | - Ralph Maddison
- National Institute for Health Innovation, University of Auckland, Auckland, New Zealand
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Kania M, Zaczek R, Zavala-Fernandez H, Janusek D, Kobylecka M, Królicki L, Opolski G, Maniewski R. ST-segment changes in high-resolution body surface potential maps measured during exercise to assess myocardial ischemia: a pilot study. Arch Med Sci 2014; 10:1086-90. [PMID: 25624843 PMCID: PMC4296061 DOI: 10.5114/aoms.2013.39938] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/22/2013] [Revised: 11/27/2013] [Accepted: 12/06/2013] [Indexed: 12/15/2022] Open
Abstract
INTRODUCTION The aim of the study was to assess myocardial ischemia by analysis of ST-segment changes in high-resolution body surface potential maps (HR-BSPM) measured at rest and during an exercise stress test. MATERIAL AND METHODS The study was carried out on a group of 28 patients with stable coronary artery disease and 15 healthy volunteers. The HR-BSPM were measured at rest and during the exercise stress test on a supine ergometer. The workload was increased in stages by 25 W every 2 min, beginning at 50 W. The maps of ST-segment depression (ST60) were calculated from time averaged recordings at rest and at maximal workload. RESULTS The efficiency in detection of myocardial ischemia was higher for HR-BSPM than for standard 12-lead electrocardiography (ECG) when both methods were evaluated by outcomes of coronarography. The sensitivity of HR-BSPM was 82.4% while for the standard 12-lead ECG exercise stress test it was 58.8%. For some patients significant changes in the ST segment were observed at stress HR-BSPM but were not visible in standard 12-lead ECG recorded under the same conditions. CONCLUSIONS Obtained high values of sensitivity and specificity in myocardial ischemia detection suggest that maps of ST60 calculated from HR-BSPM can improve detection of patients with ischemic heart disease in comparison to the standard electrocardiographic exercise stress test examinations.
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Affiliation(s)
- Michał Kania
- Nalecz Institute of Biocybernetics and Biomedical Engineering, Polish Academy of Sciences, Warsaw, Poland
| | - Rajmund Zaczek
- I Chair Department of Cardiology, Medical University of Warsaw, Warsaw, Poland
| | - Heriberto Zavala-Fernandez
- Nalecz Institute of Biocybernetics and Biomedical Engineering, Polish Academy of Sciences, Warsaw, Poland
| | - Dariusz Janusek
- Nalecz Institute of Biocybernetics and Biomedical Engineering, Polish Academy of Sciences, Warsaw, Poland
| | | | - Leszek Królicki
- Department of Nuclear Medicine, Medical University of Warsaw, Warsaw, Poland
| | - Grzegorz Opolski
- I Chair Department of Cardiology, Medical University of Warsaw, Warsaw, Poland
| | - Roman Maniewski
- Nalecz Institute of Biocybernetics and Biomedical Engineering, Polish Academy of Sciences, Warsaw, Poland
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Tsouri GR, Ostertag MH. Patient-specific 12-lead ECG reconstruction from sparse electrodes using independent component analysis. IEEE J Biomed Health Inform 2014; 18:476-82. [PMID: 24608053 DOI: 10.1109/jbhi.2013.2294561] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
We propose and evaluate a method of 12-lead electrocardiogram (ECG) reconstruction from a three-lead set. The method makes use of independent component analysis and results in adaptive patient-specific transforms. The required calibration process is short and makes use of a single beat. We apply the method to two sets of leads: leads I, II, V2 and the Frank XYZ leads. Performance is evaluated via percent correlation calculations between reconstructed and original leads from a publicly available database of 549 ECG recordings. Results depict percent correlation exceeding 96% for almost all leads. Adaptability of the method's transform is shown to compensate for changes in signal propagation conditions due to breathing, resulting in reduced variance of reconstruction accuracy across beats. This implies that the method is robust to changes that occur after the time of calibration. Accurate and adaptive reconstruction has the potential to augment the clinical significance of wireless ECG systems since the number of sensor nodes placed on the body is limited and the subject could be mobile.
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Affiliation(s)
- Abigail Price
- Department of Child Health, East Kent Hospitals University NHS Foundation Trust, Queen Elizabeth The Queen Mother Hospital, Margate, Kent, UK
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Kang JH, Suh IS, Kim JY. Intensive Care Unit Nurses' Knowledge and Nursing Practices regarding Bedside Electrocardiograph Monitoring. ACTA ACUST UNITED AC 2014. [DOI: 10.5977/jkasne.2014.20.1.60] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
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Pang BJ, Kumar S, Tacey MA, Mond HG. Capturing the His-Purkinje system is not possible from conventional right ventricular apical and nonapical pacing sites. PACING AND CLINICAL ELECTROPHYSIOLOGY: PACE 2014; 37:724-30. [PMID: 24383520 DOI: 10.1111/pace.12331] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/18/2013] [Revised: 09/22/2013] [Accepted: 10/20/2013] [Indexed: 11/28/2022]
Abstract
INTRODUCTION Direct His bundle capture may negate ventricular electrical dyssynchrony induced by right ventricular (RV) apical pacing. We sought to evaluate if direct His bundle pacing is possible with conventional pacemaker lead implantation at various sites in the RV. METHODS Consecutive patients underwent RV pacing using standard implantable active fixation pacing leads in a random order in the RV outflow tract, middle RV, and RV apex at stimulation threshold and at increasing voltages of 2.5, 5, 7.5, and 10 volts (V). At each location, QRS width and morphology on 12-lead electrocardiograph (ECG) were compared in sinus and paced rhythm at the different voltages. RESULTS Twelve patients underwent a total of 2,160 paced QRS measurements. Progressive increases in stimulation voltage did not change QRS morphology or duration regardless of site of pacing (RV outflow tract, middle RV, and RV apex) in any of the 12 ECG leads. In addition, apart from the stimulation threshold between the RV outflow tract and RV apex, there was no statistically significant difference in QRS duration between the three pacing sites. CONCLUSION In patients with a baseline normal QRS duration, none of the three conventional RV pacing sites were able to produce QRS narrowing and capture the His-Purkinje system. Furthermore, based on paced QRS duration as an indirect surrogate of electrical LV dyssynchrony, there was no clear advantage of one pacing site over another.
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Affiliation(s)
- Benjamin J Pang
- Department of Cardiology, Royal Melbourne Hospital, Parkville, Victoria, Australia; Department of Medicine, University of Melbourne, Victoria, Australia
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Herbsleb M, Mühlhaus T, Bär KJ. Differential cardiac effects of aerobic interval training versus moderate continuous training in a patient with schizophrenia: a case report. Front Psychiatry 2014; 5:119. [PMID: 25221528 PMCID: PMC4148625 DOI: 10.3389/fpsyt.2014.00119] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/05/2014] [Accepted: 08/14/2014] [Indexed: 12/24/2022] Open
Abstract
Increased cardiovascular morbidity and mortality rates for patients with schizophrenia are reported to contribute to their reduced life expectancy. Common reasons for increased cardiac mortality rates include cigarette smoking, obesity, dyslipidemia, diabetes, and poorer health behavior in general. The majority of excess mortality among people with schizophrenia is caused by cardiovascular complications. Reduced vagal activity might be one important mechanism leading to this increased cardiac mortality and has been consistently described in patients and their healthy first-degree relatives. In this case study, we compared two different aerobic exercise regimes in one patient with chronic schizophrenia to investigate their effects on cardiovascular regulation. The patient completed a 6-week period of moderate continuous training (CT) followed by a 6-week period of interval training (IT), each regime two times per week, on a stationary bicycle. This was followed by a 6-week period of detraining. Primary outcome measures examined heart rate (HR) and heart rate variability (HRV) at rest while secondary measures assessed fitness parameters such as the ventilatory threshold 1 (VT1). We observed that IT was far more effective than moderate CT in increasing HRV, as indicated by root mean of squared successive difference (improvement to baseline 27 versus 18%), and reducing resting HR (-14 versus 0%). Improvement in VT1 (21 versus -1%) was only observed after IT. Our study provides preliminary data that the type of intervention is highly influential for improving cardiac function in patients with schizophrenia. While cardiovascular function might be influenced by CT to some degree, no such effect was present in this patient with schizophrenia. In addition, the beneficial effect of IT on HR regulation vanished completely after a very short period of detraining after the intervention.
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Affiliation(s)
- Marco Herbsleb
- Pain and Autonomic Integrative Research (PAIR), Department of Psychiatry and Psychotherapy, University Hospital Jena , Jena , Germany ; Clinical Exercise Physiology (CEP), Department of Sports Medicine and Health Promotion, Friedrich-Schiller-University , Jena , Germany
| | - Tobias Mühlhaus
- Pain and Autonomic Integrative Research (PAIR), Department of Psychiatry and Psychotherapy, University Hospital Jena , Jena , Germany
| | - Karl-Jürgen Bär
- Pain and Autonomic Integrative Research (PAIR), Department of Psychiatry and Psychotherapy, University Hospital Jena , Jena , Germany
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The effect of precordial lead displacement on ECG morphology. Med Biol Eng Comput 2013; 52:109-19. [PMID: 24142562 PMCID: PMC3899452 DOI: 10.1007/s11517-013-1115-9] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2013] [Accepted: 09/02/2013] [Indexed: 10/26/2022]
Abstract
Inaccurate electrode placement and differences in inter-individual human anatomies can lead to misinterpretation of ECG examination. The aim of the study was to investigate the effect of precordial electrodes displacement on morphology of the ECG signal in a group of 60 patients with diagnosed cardiac disease. Shapes of ECG signals recorded from precordial leads were compared with signals interpolated at the points located at a distance up to 5 cm from lead location. Shape differences of the QRS and ST-T-U complexes were quantified using the distribution function method, correlation coefficient, root-mean-square error (RMSE), and normalized RMSE. The relative variability (RV) index was calculated to quantify inter-individual variability. ECG morphology changes were prominent in all shape parameters beyond 2 cm distance to precordial leads. Lead V2 was the most sensitive to displacement errors, followed by leads V3, V1, and V4, for which the direction of electrodes displacement plays a key role. No visible changes in ECG morphology were observed in leads V5 and V6, only scaling effect of signal amplitude. The RV ranged from 0.639 to 0.989. Distortions in ECG tracings increase with the distance from precordial lead, which are specific to chosen electrode, direction of displacement, and for ECG segment selected for calculations.
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Bond RR, Finlay DD, Nugent CD, Moore G, Guldenring D. Methods for presenting and visualising electrocardiographic data: From temporal signals to spatial imaging. J Electrocardiol 2013; 46:182-96. [PMID: 23462202 DOI: 10.1016/j.jelectrocard.2013.01.008] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2012] [Indexed: 11/17/2022]
Abstract
INTRODUCTION The electrocardiogram (ECG) is a recording of the electrical activity of the heart. It is commonly used to non-invasively assess the cardiac activity of a patient. Since 1938, ECG data has been visualised as 12 scalar traces (known as the standard 12-lead ECG). Although this is known as the standard approach, there has been a myriad of alternative methods proposed to visualise ECG data. The purpose of this paper is to provide an overview of these methods and to introduce the field of ECG visualisation to early stage researchers. A scientific purpose is to consider the future of ECG visualisation within routine clinical practice. METHODS This paper structures the different ECG visualisation methods using four categories, i.e. temporal, vectorial, spatial and interactive. Temporal methods present the data with respect to time, vectorial methods present data with respect to direction and magnitude, spatial methods present data in 2D or 3D space and interactive methods utilise interactive computing to facilitate efficient interrogation of ECG data at different levels of detail. CONCLUSION Spatial visualisation has been around since its introduction by Waller and vector based visualisation has been around since the 1920s. Given these approaches have already been given the 'test of time', they are unlikely to be replaced as the standard in the near future. Instead of being replaced, the standard is more likely to be 'supplemented'. However, the design and presentation of these ECG visualisation supplements need to be universally standardised. Subsequent to the development of 'standardised supplements', as a requirement, they could then be integrated into all ECG machines. We recognise that without intuitive software and interactivity on mobile devices (e.g. tablet PCs), it is impractical to integrate the more advanced ECG visualisation methods into routine practice (i.e. epicardial mapping using an inverse solution).
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Affiliation(s)
- Raymond R Bond
- University of Ulster, Jordanstown, Northern Ireland, UK.
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Bond RR, Finlay DD, Nugent CD, Breen C, Guldenring D, Daly MJ. The effects of electrode misplacement on clinicians' interpretation of the standard 12-lead electrocardiogram. Eur J Intern Med 2012; 23:610-5. [PMID: 22939805 DOI: 10.1016/j.ejim.2012.03.011] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/29/2011] [Revised: 03/01/2012] [Accepted: 03/11/2012] [Indexed: 11/28/2022]
Abstract
INTRODUCTION This study investigates how a particular incorrect electrode configuration affects the 12-lead Electrocardiogram (ECG). METHODS A correct and an incorrect 12-lead ECG were extracted from a 192-lead BSPM. This was done for 232 BSPMs yielding 464 12-lead ECGs. The particular incorrect ECG involved displacing electrodes V1 and V2 in the second intercostal space whilst also offsetting the remaining electrodes. These ECGs were examined in two stages: (a) analysis of the effects of electrode misplacement on signal morphology and (b) analysis of how often the incorrect electrode configuration changed the diagnosis of two clinicians in a random sample of 75 patients. RESULTS According to the Root Mean Square Error (RMSE) of the difference between PQRST intervals in the correct and incorrect ECGs, lead V2 is the most affected lead (mean: 185 μV ± 82 μV), followed by lead V4 (mean: 114 μV ± 59 μV) and lead V1 (mean: 100 μV ± 47 μV). It was found that if the incorrect electrode configuration is applied, there is a 17% to a 24% chance the diagnostic interpretation will be different. Quantified using Similarity Coefficient (SC) leads V1 and V2 were found to be more alike when misplaced in the second intercostal space. The average SC between these leads when correctly placed was 0.08 (± 0.65), however when incorrectly placed, the average SC was 0.43 (± 0.3). CONCLUSION There is a reasonable chance this particular incorrect electrode configuration will change the diagnosis of the 12-lead ECG. This highlights the importance of developing algorithms to detect electrode misplacement along with better education regarding ECG acquisition.
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Affiliation(s)
- R R Bond
- Computer Science Research Institute, School of Computing and Mathematics, University of Ulster, Northern Ireland, UK.
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Ostertag MH, Tsouri GR. Reconstructing ECG precordial leads from a reduced lead set using independent component analysis. ANNUAL INTERNATIONAL CONFERENCE OF THE IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY. IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY. ANNUAL INTERNATIONAL CONFERENCE 2012; 2011:4414-7. [PMID: 22255318 DOI: 10.1109/iembs.2011.6091095] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
In this paper, precordial lead reconstruction from a reduced set of leads is considered. We propose the use of independent component analysis to train patient-specific transforms from a reduced lead set to the six precordial leads of the standard 12-lead electrocardiogram. The proposed approach is applied to a publicly available database comprising 549 ECG recordings of patients with varying cardiovascular conditions. The fidelity of reconstruction is measured using percent correlation between the actual and reconstructed signals following a 30 seconds time lapse. The mean correlation is over 95% with a standard deviation under 12.7% for all reconstructed leads. The results demonstrate the potential of the suggested approach to provide a reliable solution to precordial leads reconstruction.
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Affiliation(s)
- Michael H Ostertag
- Rochester Institute of Technology, Rochester, NY 14623, USA. mho7745@ rit.edu
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Paskaranandavadivel N, Cheng LK, Du P, O'Grady G, Pullan AJ. Improved signal processing techniques for the analysis of high resolution serosal slow wave activity in the stomach. ANNUAL INTERNATIONAL CONFERENCE OF THE IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY. IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY. ANNUAL INTERNATIONAL CONFERENCE 2012; 2011:1737-40. [PMID: 22254662 DOI: 10.1109/iembs.2011.6090497] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
High resolution electrical mapping of slow waves on the stomach serosa has improved our understanding of gastric electrical activity in normal and diseased states. In order to assess the signals acquired from high resolution mapping, a robust framework is required. Our framework is semi-automated and allows for rapid processing, analysis and interpretation of slow waves via qualitative and quantitative measures including isochronal activation time mapping, and velocity and amplitude mapping. Noise removal techniques were validated for raw recorded signals, where three filters were evaluated for baseline drift removal and three filters for removal of high frequency interference. For baseline drift removal, the Gaussian moving median filter was most effective, while for eliminating high frequency interference the Savitzky Golay filter was the most effective. Methods for assessing slow wave velocity and amplitude were investigated. To estimate slow wave velocity, a finite difference approach with interpolation and smoothing was used. To evaluate the slow wave amplitude and width, a peak and trough method based on Savitzky Golay derivative filters was used. Together, these methods constitute a significantly improved framework for analyzing gastric high resolution mapping data.
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Marcus KA, Janoušek J, Barends ME, Weijers G, de Korte CL, Kapusta L. Synchronicity of systolic deformation in healthy pediatric and young adult subjects: a two-dimensional strain echocardiography study. Am J Physiol Heart Circ Physiol 2012; 302:H196-205. [DOI: 10.1152/ajpheart.00740.2011] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Two-dimensional speckle tracking echocardiography (2DSTE) offers valuable information in the echocardiographic assessment of ventricular myocardial function. It enables the quantification and timing of systolic ventricular myocardial deformation. In addition, 2DSTE can be used to identify mechanical dyssynchrony, which is an important parameter in predicting the response to cardiac resynchronization therapy for heart failure. Detailed knowledge of normal timing of systolic deformation and its degree of synchronicity in children is lacking. We aimed to establish the normal timing of left ventricular myocardial systolic deformation using 2DSTE in a large cohort of healthy children and young adults. Transthoracic echocardiograms were acquired in 195 healthy subjects (139 children and 56 young adult <40 yr of age) and were retrospectively analyzed. Time to peak systolic longitudinal, circumferential, and radial strain was determined by means of speckle tracking. Strong, statistically significant relations between age as well as various anthropometric variables (e.g., heart rate) and timing of systolic deformation ( P < 0.0001) were present. The extent of dyssynchronous deformation increased with age. This is the first report that establishes reference values per cardiac segment for time to peak systolic myocardial strain values in all three directions assessed with 2DSTE in a large pediatric and young adult cohort. We emphasize the need for using age-specific reference values as well as heart rate correction for the adequate interpretation of 2DSTE measurements.
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Affiliation(s)
- Karen A. Marcus
- Children's Heart Centre, Radboud University Nijmegen Medical Centre, Nijmegen, The Netherlands
| | - Jan Janoušek
- Kardiocentrum and Cardiovascular Research Center, University Hospital Motol, Prague, Czech Republic
| | - Marlieke E. Barends
- Children's Heart Centre, Radboud University Nijmegen Medical Centre, Nijmegen, The Netherlands
| | - Gert Weijers
- Clinical Physics Laboratory, Radboud University Nijmegen Medical Centre, Nijmegen, The Netherlands; and
| | - Chris L. de Korte
- Clinical Physics Laboratory, Radboud University Nijmegen Medical Centre, Nijmegen, The Netherlands; and
| | - Livia Kapusta
- Children's Heart Centre, Radboud University Nijmegen Medical Centre, Nijmegen, The Netherlands
- Pediatric Cardiology Unit, Edith Wolfson Medical Center, Holon, Israel
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An Efficient R-peak Detection Based on New Nonlinear Transformation and First-Order Gaussian Differentiator. Cardiovasc Eng Technol 2011. [DOI: 10.1007/s13239-011-0065-3] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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Bond RR, Finlay DD, Nugent CD, Moore G, Guldenring D. A simulation tool for visualizing and studying the effects of electrode misplacement on the 12-lead electrocardiogram. J Electrocardiol 2011; 44:439-44. [DOI: 10.1016/j.jelectrocard.2011.03.006] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2010] [Indexed: 01/10/2023]
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Abächerli R, Schmid HJ. Meet the challenge of high-pass filter and ST-segment requirements with a DC-coupled digital electrocardiogram amplifier. J Electrocardiol 2009; 42:574-9. [DOI: 10.1016/j.jelectrocard.2009.07.012] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2009] [Indexed: 10/20/2022]
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Mason JW, Hancock EW, Gettes LS. Recommendations for the standardization and interpretation of the electrocardiogram. Part II: Electrocardiography diagnostic statement list. A scientific statement from the American Heart Association Electrocardiography and Arrhythmias Committee, Council on Clinical Cardiology; the American College of Cardiology Foundation; and the Heart Rhythm Society. Heart Rhythm 2007; 4:413-9. [PMID: 17341414 DOI: 10.1016/j.hrthm.2007.01.028] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/23/2007] [Indexed: 11/21/2022]
Abstract
This statement provides a concise list of diagnostic terms for ECG interpretation that can be shared by students, teachers, and readers of electrocardiography. This effort was motivated by the existence of multiple automated diagnostic code sets containing imprecise and overlapping terms. An intended outcome of this statement list is greater uniformity of ECG diagnosis and a resultant improvement in patient care. The lexicon includes primary diagnostic statements, secondary diagnostic statements, modifiers, and statements for the comparison of ECGs. This diagnostic lexicon should be reviewed and updated periodically.
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