18,472 results match your criteria qrs

Initial experience, feasibility and safety of permanent left bundle branch pacing: results from a prospective single-centre study.

Neth Heart J 2021 Nov 26. Epub 2021 Nov 26.

Department of Cardiology, Catharina Hospital, Eindhoven, The Netherlands.

Background: Left bundle branch (LBB) pacing is a novel pacing technique which may serve as an alternative to both right ventricular pacing for symptomatic bradycardia and cardiac resynchronisation therapy (CRT). A substantial amount of data is reported by relatively few, highly experienced centres. This study describes the first experience of LBB pacing in a high-volume device centre. Read More

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November 2021

Molecular Remodeling of Cardiac Sinus Node Associated with Acute Chagas Disease Myocarditis.

Microorganisms 2021 Oct 23;9(11). Epub 2021 Oct 23.

Departamento de Biología Molecular, Universidad Autónoma de Madrid, 28049 Madrid, Spain.

Chagas disease principally affects Latin-American people, but it currently has worldwide distribution due to migration. Death among those with Chagas disease can occur suddenly and without warning, even in those who may not have evidence of clinical or structural cardiac disease and who are younger than 60 years old. HCN4 channels, one of the principal elements responsible for pacemaker currents, are associated with cardiac fetal reprogramming and supraventricular and ventricular arrhythmias, but their role in chagasic arrhythmias is not clear. Read More

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October 2021

Very Long-Term Follow-Up in Cardiac Resynchronization Therapy: Wider Paced QRS Equals Worse Prognosis.

J Pers Med 2021 Nov 11;11(11). Epub 2021 Nov 11.

Department of Cardiology II-Electrophysiology, Albert-Schweitzer-Campus 1, University Hospital Muenster, 48149 Muenster, Germany.

Background: Different electrocardiogram (ECG) findings are known to be independent predictors of clinical response to cardiac resynchronization therapy (CRT). It remains unknown how these findings influence very long-term prognosis.

Methods And Results: A total of 102 consecutive patients (75 males, mean age 65 ± 10 years) referred to our center for CRT implantation had previously been included in this prospective observational study. Read More

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November 2021

Validity of the Friedrich Short Form of the Questionnaire on Resources and Stress in Parents of Individuals with Autism Spectrum Disorder.

Eun-Young Park

Int J Environ Res Public Health 2021 Nov 19;18(22). Epub 2021 Nov 19.

Department of Secondary Special Education, Jeonju University, Jeonju 55069, Korea.

There is insufficient knowledge about the psychometric properties of the Friedrich short form of the Questionnaire on Resources and Stress (QRS-F) used to measure the caregiving burden of caregivers of individuals with autism spectrum disorder (ASD). The present study, therefore, aimed to confirm the validity of the QRS-F. The data selected using the systematic sampling method were analyzed to verify the factor structure of the QRS-F on parents of individuals with ASD. Read More

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November 2021

Assessment of Selected Baseline and Post-PCI Electrocardiographic Parameters as Predictors of Left Ventricular Systolic Dysfunction after a First ST-Segment Elevation Myocardial Infarction.

J Clin Med 2021 Nov 22;10(22). Epub 2021 Nov 22.

Department of Cardiology and Internal Medicine, Collegium Medicum, Nicolaus Copernicus University, ul. Skłodowskiej-Curie 9, 85-094 Bydgoszcz, Poland.

Objective: To assess the performance of ten electrocardiographic (ECG) parameters regarding the prediction of left ventricular systolic dysfunction (LVSD) after a first ST-segment-elevation myocardial infarction (STEMI).

Methods: We analyzed 249 patients (74.7% males) treated with primary percutaneous coronary intervention (PCI) included into a single-center cohort study. Read More

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November 2021

Suppression of Electrographic Seizures Is Associated with Amelioration of QTc Interval Prolongation in Patients with Traumatic Brain Injury.

J Clin Med 2021 Nov 18;10(22). Epub 2021 Nov 18.

Department of Anaesthesiology and Intensive Care, Hospital Clìnico Universitario de Valencia, University of Valencia, 46010 Valencia, Spain.

Introduction: Disorders in electroencephalography (EEG) are commonly noted in patients with traumatic brain injury (TBI) and may be associated with electrocardiographic disturbances. Electrographic seizures (ESz) are the most common features in these patients. This study aimed to explore the relationship between ESz and possible changes in QTc interval and spatial QRS-T angle both during ESz and after ESz resolution. Read More

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November 2021

S-R index in V1/V3 serves as a novel criterion to discriminate idiopathic premature ventricular contractions originating from posteroseptal right ventricular outflow tract versus right coronary cusp.

J Electrocardiol 2021 Nov 19;70:7-12. Epub 2021 Nov 19.

Department of Cardiology, The Second Hospital of Hebei Medical University, Shijiazhuang, China. Electronic address:

Aim: The current study aimed to establish a novel electrocardiographic (ECG) criterion for discrimination of idiopathic premature ventricular contractions (PVCs) originating from posteroseptal right ventricular outflow tract (sRVOT-p) versus right coronary cusp (RCC).

Methods: A total of 76 patients with idiopathic PVCs who underwent mapping and successful ablation were retrospectively included. Among them, 37 patients had PVCs from sRVOT-p origin and 39 patients from RCC origin. Read More

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November 2021

Coumel's sign reversed: What is the mechanism?

Indian Pacing Electrophysiol J 2021 Nov 23. Epub 2021 Nov 23.

Department of Cardiology, Jawaharlal Institute of Postgraduate Medical Education and Research, Puducherry, India.

A patient presented with documented narrow QRS tachycardia. During electrophysiological study, he has orthodromic reciprocating tachycardia with atrial activation consistent with left free wall accessory pathway. With induction of tachycardia, beats with LBBB morphology have shorter cycle length than those with narrow QRS. Read More

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November 2021

Clinical significance of different atlas of intracavitary electrocardiogram for PICC localization in 961 cases.

Ann Noninvasive Electrocardiol 2021 Nov 26:e12904. Epub 2021 Nov 26.

Oncology Department Ⅳ, Shijiazhuang People's Hospital, Shijiazhuang, China.

Purpose: To explore the application of ECG-guided localization technology in PICC catheterization and the clinical significance of different maps of intracavitary ECG in PICC tip localization.

Methods: In the process of catheter placement under the guidance of ultrasound, the technique of intracavitary ECG location was used. The length of the catheter was measured on the body's surface. Read More

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November 2021

Frontal QRS-T angle as a predictive marker for myocardial damage in acute carbon monoxide poisoning.

Hum Exp Toxicol 2021 Nov 24:9603271211043477. Epub 2021 Nov 24.

Faculty of Medicine, Department of Emergency Medicine, 52954Sivas Cumhuriyet University, Sivas, Turkey.

Introduction: The present study was undertaken to investigate the prognostic value of the frontal QRS-T angle associated with adverse cardiac outcomes in patients with carbon monoxide (CO) poisoning in early stages in the emergency department.

Materials And Methods: The data of 212 patients with CO poisoning who were admitted to the ED between January 2010 and May 2020 were retrospectively analyzed. The frontal QRS-T angle was obtained from the automatic reports of the EKG device. Read More

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November 2021

Association between fragmented QRS and postprocedural rhythm disturbances in patients who underwent transcatheter aortic valve implantation.

Rev Assoc Med Bras (1992) 2021 Sep;67(9):1311-1316

Atilim University, Medicine Faculty, Department of Cardiology - Ankara, Turkey.

Introduction: According to recent studies, the rate of atrioventricular block requiring permanent pacing in patients following transcatheter aortic valve implantation varied between 5.7% and 42.5%. Read More

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September 2021

Characteristic Electrocardiography Findings of COVID-19 Patients.

Arch Iran Med 2021 09 1;24(9):706-712. Epub 2021 Sep 1.

Department of Cardiology, Fethi Sekin Education and Research Hospital, Elazıg, Turkey.

Background: Determining a relationship between coronavirus disease 2019 (COVID-19) and the ECG findings of the patients with this disease can assist in early diagnosis and patient management based on these findings. This study aimed to investigate whether COVID-19 patients had characteristic ECG findings in the acute period.

Methods: A total of 124 patients were divided into two groups as those diagnosed with COVID-19 and controls. Read More

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September 2021

A rapid electromechanical model to predict reverse remodeling following cardiac resynchronization therapy.

Biomech Model Mechanobiol 2021 Nov 24. Epub 2021 Nov 24.

Department of Biomedical Engineering, University of Virginia, Box 800759, Health System, Charlottesville, VA, 22903, USA.

Cardiac resynchronization therapy (CRT) is an effective therapy for patients who suffer from heart failure and ventricular dyssynchrony such as left bundle branch block (LBBB). When it works, it reverses adverse left ventricular (LV) remodeling and the progression of heart failure. However, CRT response rate is currently as low as 50-65%. Read More

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November 2021

Gestational Age and Neonatal Electrocardiograms.

Pediatrics 2021 Nov 24. Epub 2021 Nov 24.

Department of Cardiology, Herlev-Gentofte Hospital, Copenhagen University Hospital, Copenhagen, Denmark.

Objectives: Interpretation of the neonatal electrocardiogram (ECG) is challenging due to the profound changes of the cardiovascular system in this period. We aimed to investigate the impact of gestational age (GA) on the neonatal ECG and create GA-specific reference values.

Methods: The Copenhagen Baby Heart Study is a prospective general population study that offered cardiac evaluation of neonates. Read More

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November 2021

Visual saliency detection approach for long-term ECG analysis.

Comput Methods Programs Biomed 2021 Nov 11;213:106518. Epub 2021 Nov 11.

Department of Electrical, Computer and Biomedical Engineering, Ryerson University, 350 Victoria Street, Toronto, Ontario M5B 2K3, Canada. Electronic address:

Background And Objective: Detection and analysis of QRS-complex as well as the processing of electrocardiogram (ECG) signal using computers are being practiced for over the last fifty-eight years, approximately, and yet the thirst of designing superior ECG processing and recognition algorithms still captures researchers' attention around the globe. A saliency detection-based technique for the processing of one-dimensional biomedical signals such as ECG is proposed here for the first time, to the best or our knowledge.

Methods And Results: In this proposed research work, first, a trigonometric threshold-based technique is used to identify the QRS-complexes from the ECG signal. Read More

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November 2021

The Efficacy Comparison Between Guan-Fu Base A Hydrochloric Injection vs. Propafenone Hydrochloric Injection in the Treatment of Arrhythmia: Systemic Review and Meta-Analysis.

Front Cardiovasc Med 2021 5;8:723932. Epub 2021 Nov 5.

Tianjin University of Traditional Chinese Medicine, Tianjin, China.

To determine using a systematic assessment and meta-analysis if GFA injection is an appropriate substitute of propafenone for arrhythmic. Conduct a systematic review and meta-analysis of randomized controlled trials. PubMed, Web of Science, Cochrane Library, Embase, Wan-Fang Database, VIP, CNKI, and Sino Med from their inception to 7 March 2021. Read More

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November 2021

Physical Exercise Promotes a Reduction in Cardiac Fibrosis in the Chronic Indeterminate Form of Experimental Chagas Disease.

Front Immunol 2021 4;12:712034. Epub 2021 Nov 4.

Laboratório de Biologia Celular, Instituto Oswaldo Cruz, Fundação Oswaldo Cruz, Rio de Janeiro, Brazil.

Chagas disease (CD), caused by the protozoan , is a neglected tropical disease and a health problem in Latin America. Etiological treatment has limited effectiveness in chronic CD; thus, new therapeutic strategies are required. The practice of physical exercises has been widely advocated to improve the quality of life of CD patients. Read More

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November 2021

Selective proximal left anterior fascicle pacemapping for guiding narrow QRS premature ventricular complex ablation from the right coronary cusp.

J Electrocardiol 2021 Nov 8;70:4-6. Epub 2021 Nov 8.

Heart Institute, Teknon Medical Center, Barcelona, Spain. Electronic address:

A 38-year-old woman with a structurally normal heart was referred for catheter ablation due to symptomatic, monomorphic, high burden (12%) premature ventricular complexes (PVC) refractory to medical therapy. The PVC's ECG morphology suggested an origin in the proximal left anterior fascicle (LAF). During procedure PVCs were mechanically suppressed. Read More

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November 2021

Bradyarrhythmias Detected by Extended Rhythm Recording in Patients Undergoing Transcatheter Aortic Valve Replacement (BRADY-TAVR Study).

Heart Rhythm 2021 Nov 18. Epub 2021 Nov 18.

Heart, Vascular and Thoracic Institute, Cleveland Clinic Cleveland, OH, USA.

Background: Bradyarrhythmias leading to permanent pacemaker (PPM) continue to be a complication after Transcatheter Aortic Valve Replacement (TAVR) OBJECTIVES: To assess the prevalence of bradyarrhythmias using ECG extended rhythm recording among patients pre and post TAVR and whether they can predict the need for PPM METHODS: This was a prospective single center study in patients undergoing TAVR. Patients received an ECG-patch for 2 weeks pre, immediately post, and 2-3 months after TAVR. Caring physicians were blinded to the results of the patch except when predefined urgent arrhythmias were detected. Read More

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November 2021

Evolution of single-lead ECG for STEMI detection using a deep learning approach.

Int J Cardiol 2021 Nov 18. Epub 2021 Nov 18.

Lumen Foundation, Division of Telemedicine & Artificial Intelligence, Miami, FL, USA. Electronic address:

Background: While ST-Elevation Myocardial Infarction (STEMI) door-to-balloon times are often below 90 min, symptom to door times remain long at 2.5-h, due at least in part to a delay in diagnosis.

Objectives: To develop and validate a machine learning-guided algorithm which uses a single‑lead electrocardiogram (ECG) for STEMI detection to speed diagnosis. Read More

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November 2021

Effect of vasopressin on electrocardiographic changes produced by ischemia-reperfusion in rats.

Pak J Pharm Sci 2021 Jul;34(4):1409-1414

Department of Cardiology, Lorestan University of Medical Sciences, Khoramabad, Iran.

The present study was conducted to identify the effect of vasopressin (AVP) on electrocardiographic changes produced by ischemia-reperfusion. Male rats were divided into seven groups (n=8-13) subjected to 30min ischemia and 120 min reperfusion. In protocol I (control group), saline was administered before ischemia. Read More

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Fragmented QRS as a predictor of cardiac events in patients with cardiac sarcoidosis.

J Cardiol 2021 Nov 16. Epub 2021 Nov 16.

Department of Cardiovascular Medicine, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama, Japan.

Background: Multiple spikes within the QRS complex, known as fragmented QRS (fQRS), are associated with the occurrences of ventricular arrhythmic events (VAEs) in patients with Brugada syndrome and hypertrophic cardiomyopathy. However, the association between fQRS and occurrence of VAEs in patients with cardiac sarcoidosis (CS) has not been elucidated.

Methods: We evaluated the associations between fQRS and cardiac events including VAEs [non-sustained ventricular tachycardia (NSVT), sustained ventricular tachycardia (VT), and ventricular fibrillation (VF)], hospitalization for heart failure, and all-cause death in 68 patients with CS (30 patients with fQRS vs. Read More

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November 2021

[Cardiac contractility modulation].

Herz 2021 Nov 19. Epub 2021 Nov 19.

Medizinische Klinik II, Universitätsklinikum Schleswig-Holstein - Campus Lübeck, Ratzeburger Allee 160, 23562, Lübeck, Deutschland.

Heart failure (HF) will be one of the biggest medical challenges in the coming years, with increasing prevalence in an aging society. It is associated with a poor prognosis and impaired quality of life-despite steadily improving medical therapy which has resulted in a steady decrease in mortality and an increase in quality of life. In medically refractory patients with impaired left ventricular (LV) function, left bundle branch block and wide QRS complex (≥130 ms) cardiac resynchronization therapy (CRT) in addition to medical therapy has become the gold standard. Read More

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November 2021

A Digital Electrocardiographic System for Assessing Myocardial Electrical Instability: Principles and Applications.

Sovrem Tekhnologii Med 2021 28;12(6):15-19. Epub 2020 Dec 28.

Professor, Head of the Laboratory of Medical Information Technologies Republican Scientific and Practical Center "Cardiology", Ministry of Health of the Republic of Belarus, 110B Rosa Luxemburg St., Minsk, 220036, Republic of Belarus.

was to develop an ECG hardware and software system for monitoring electrical instability of the myocardium and to assess the diagnostic and prognostic capabilities of this setup in a cardiology clinic.

Materials And Methods: The Intecard 7.3 software and hardware system developed in this study makes it possible to measure fluctuations of the ECG amplitude-time parameters using the beat-to-beat mode. Read More

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December 2020

Usefulness of cardiac magnetic resonance images for prediction of sudden cardiac arrest in patients with mitral valve prolapse: a multicenter retrospective cohort study.

BMC Cardiovasc Disord 2021 11 17;21(1):546. Epub 2021 Nov 17.

Departments of Cardiology, Severance Cardiovascular Hospital, College of Medicine, Yonsei University, 50-1 Yonsei-ro Seodaemun-gu, Seoul, 03722, Republic of Korea.

Background: An association has been identified between mitral valve prolapse (MVP) and sudden cardiac arrest (SCA), and ventricular arrhythmias (VA). This study aimed to elucidate predictive factors for SCA or VA in MVP patients.

Methods: MVP patients who underwent cardiac magnetic resonance (CMR) were retrospectively included. Read More

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November 2021

Comparison of the arrhythmogenic substrate for ventricular tachycardia in patients with ischemic vs non-ischemic cardiomyopathy - insights from high-density, multi-electrode catheter mapping.

J Interv Card Electrophysiol 2021 Nov 17. Epub 2021 Nov 17.

Department of Cardiology, Westmead Hospital, Westmead Applied Research Centre, University of Sydney, Hawkesbury Road, Westmead, NSW, 2145, Australia.

Purpose: The purpose of this study was to compare the differences of arrhythmogenic substrate using high-density mapping in ventricular tachycardia (VT) patients with ischemic (ICM) vs non-ischemic cardiomyopathy (NICM).

Methods: Data from patients presenting for VT ablation from December 2016 to December 2020 at Westmead Hospital were reviewed.

Results: Sixty consecutive patients with structural heart disease (ICM 57%, NICM 43%, mean age 66 years) having catheter ablation of scar-related VT with pre-dominant left ventricular involvement were included. Read More

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November 2021

Characterization of electrocorticographic, electromyographic and electrocardiographic recordings after the use of caffeine in Wistar rats.

Einstein (Sao Paulo) 2021 15;19:eAO6417. Epub 2021 Nov 15.

Universidade Federal do Pará, Belém, PA, Brazil.

Objective: To describe electrocorticographic, electromyographic and electrocardiographic profiles to report the electrophysiological effects of caffeine in Wistar rats.

Methods: Male adult Wistar rats weighing 230g to 250g were used. Rats were allocated to one of two groups, as follows: Group 1, Control, intraperitoneal injection of 0. Read More

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November 2021

Clinical Utility of the Electrocardiographic P-Wave Axis in Patients with Chronic Obstructive Pulmonary Disease.

Respiration 2021 Nov 16:1-8. Epub 2021 Nov 16.

Division of Pulmonary Medicine, Department of Medicine, Keio University School of Medicine, Tokyo, Japan.

Background: The vertical P-wave axis on electrocardiography (ECG) is a useful criterion for screening patients with chronic obstructive pulmonary disease (COPD). This study aimed to investigate the clinical characteristics of patients with COPD with a vertical P-wave axis as they have not yet been elucidated.

Methods: Keio University and its affiliated hospitals conducted an observational COPD cohort study over 3 years. Read More

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November 2021

Epicardial Adipose Tissue Measured From Computed Tomography Predicts Cardiac Resynchronization Therapy Response in Patients With Non-ischemic Systolic Heart Failure.

Front Cardiovasc Med 2021 28;8:678467. Epub 2021 Oct 28.

Department of Cardiology, The First Affiliated Hospital of Nanjing Medical University, Nanjing, China.

Epicardial adipose tissue (EAT) has been linked with the pathogenesis of heart failure (HF). Limited data have been reported about the clinical value of EAT for cardiac resynchronization therapy (CRT) in non-ischemic systolic HF. We aimed to explore the values of EAT measured from CT to predict the response to CRT in patients with non-ischemic systolic HF. Read More

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October 2021