1,498 results match your criteria qrs axis

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

View Article and Full-Text PDF
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

View Article and Full-Text PDF
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

View Article and Full-Text PDF
October 2021

Pediatric T-wave memory after accessory pathway ablation in Wolff-Parkinson-White syndrome.

Heart Rhythm 2021 Nov 9. Epub 2021 Nov 9.

Arrhythmia Service, Department of Cardiology, Boston Children's Hospital, Boston, MA 02115; Department of Pediatrics, Harvard Medical School, Boston, MA 02115.

Background: Altered ventricular depolarization due to manifest accessory pathway conduction, Wolff-Parkinson-White syndrome, leads to repolarization abnormalities that persist after pathway ablation. The term T-wave memory (TWM) has been applied to these changes, as the post-ablation T-wave vector "remembers" the preexcited QRS vector. In adults, these abnormalities can be misinterpreted as ischemia leading to unnecessary interventions. Read More

View Article and Full-Text PDF
November 2021

Electrocardiographic changes in Emphysema.

World J Cardiol 2021 Oct;13(10):533-545

Department of Cardiology, Westchester Medical Center Network Advanced Physician Services, Poughkeepsie, NY 12601, United States.

Chronic obstructive lung disease (COPD), predominantly emphysema, causes several thoracic anatomical and hemodynamic changes which may cause changes in various electrocardiographic parameters. A 12-lead electrocardiogram (ECG), which is often a part of routine evaluation in most clinical settings, may serve as a useful screening modality for diagnosis of COPD or emphysema. Our current article aims to provide a comprehensive review of the electrocardiographic changes encountered in COPD/emphysema utilizing published PubMed and Medline literature database. Read More

View Article and Full-Text PDF
October 2021

Electrocardiogram monitoring in the prone position in coronavirus disease 2019 acute respiratory distress syndrome.

Eur J Cardiovasc Nurs 2021 Oct 25. Epub 2021 Oct 25.

Service de Médecine Intensive - Réanimation, Hospices Civils de Lyon, Hôpital Edouard Herriot, Service de Médecine Intensive - Réanimation, 5, place d'Arsonval, Lyon F-69437, France.

Aims: Prone positioning is increasingly used for treating coronavirus disease 2019 (COVID-19)-induced acute respiratory distress syndrome (ARDS). In these high-risk patients for cardiovascular events who may spend more than 16 h a day in the prone position, an adequate monitoring of electrocardiogram (ECG) is mandatory. However, effects of prone positioning on the ECG are unknown as is the validity of the ECG recorded with electrodes placed dorsally. Read More

View Article and Full-Text PDF
October 2021

Electrocardiography of cardiac resynchronization therapy: Pitfalls and practical tips.

J Cardiovasc Electrophysiol 2021 Oct 19. Epub 2021 Oct 19.

Central Laboratories, Onassis Cardiac Surgery Center, Athens, Greece.

Cardiac resynchronization therapy (CRT) has been established as an effective mode of therapy in patients with heart failure and concurrent cardiac dyssynchrony, principally in the form of left bundle branch block (LBBB). The widespread use of CRT has ushered in a new landscape in 12-lead electrocardiography (ECG). ECG readings in these patients are most important to guide troubleshooting and also appropriate device programming, as well as discerning and managing nonresponders. Read More

View Article and Full-Text PDF
October 2021

Assessment of Clinical Usefulness of Resting Electrocardiogram (PH-ECG Score) in Monitoring the Efficacy of Balloon Pulmonary Angioplasty (BPA) in Patients with Chronic Thromboembolic Pulmonary Hypertension (CTEPH).

J Clin Med 2021 Sep 30;10(19). Epub 2021 Sep 30.

Department of Pulmonary Circulation, Thromboembolic Diseases and Cardiology, Centre of Postgraduate Medical Education, European Health Centre Otwock, 05-400 Otwock, Poland.

Background: Balloon pulmonary angioplasty (BPA) is a form of therapy for chronic thromboembolic pulmonary hypertension (CTEPH). The study objective is to assess the clinical usefulness of resting ECG (PH-ECG score) in monitoring the efficacy of BPA in CTEPH patients.

Methods And Results: Ninety-four ( = 94) CTEPH patients were included in the analysis. Read More

View Article and Full-Text PDF
September 2021

Electrocardiographic alterations by pneumothorax: a case-control study with review of the literature.

Swiss Med Wkly 2021 08 3;151:w30041. Epub 2021 Aug 3.

Cardiology Department, Cantonal Hospital of St. Gallen, St. Gallen, Switzerlan.

Background: Numerous ECG alterations due to pneumothorax have been reported. The objective of the study was to establish the presence of ECG changes associated with pneumothorax in the literature, and in a cohort of patients with proven pneumothorax compared with age- and sex-matched healthy controls.

Methods: A systematic review for ECG alterations associated with pneumothorax was performed. Read More

View Article and Full-Text PDF

Electrocardiographic changes in young patients with spontaneous pneumothorax: A retrospective study.

Medicine (Baltimore) 2021 Jul;100(30):e26793

Pediatric Division, Shamir Medical Center (Assaf Harofeh), Zerifin, affiliated to the Sackler Faculty of Medicine, Tel-Aviv University, Tel-Aviv, Israel.

Abstract: Primary spontaneous pneumothorax (PSP) commonly occurs in adolescents. PSP symptoms can mimic cardiac event. We aimed to examine electrocardiography (ECG) changes that accompanied PSP in relation to side and size of pneumothorax. Read More

View Article and Full-Text PDF

ECG abnormalities among HIV infected children placed on ART at Enugu, South East of Nigeria.

Afr Health Sci 2020 Dec;20(4):1742-1748

University of Nigeria, Department Physiology/Obstetrics & Gynaecology.

Background: Cardiovascular abnormalities are not much reported among human immunodeficiency virus (HIV) infected children especially in Africa where there is high HIV disease. In addition, the use of highly active antiretroviral therapy (HAART) in such children may have a protective effect on the cardiovascular system.

Methods: Cross-sectional study of randomly selected eighty HIV infected and 80 aged matched non- HIV-infected children were used. Read More

View Article and Full-Text PDF
December 2020

Assessment of a Novel, 22-lead Mobile Electrocardiogram in Elite, Adolescent Footballers.

Int J Sports Med 2021 Aug 13. Epub 2021 Aug 13.

Congenital Heart Unit, Bristol Heart Institute, Upper Maudlin Street, National Institute for Health Research Cardiovascular Biomedical Research Centre, Bristol, United Kingdom of Great Britain and Northern Ireland.

The 12-lead electrocardiogram is a key component of cardiac screening in elite adolescent footballers. Current technology hampers mobile electrocardiogram monitoring that could reduce the time-to-diagnosis in symptomatic athletes. Recently, a 22-lead mobile electrocardiogram monitor, CardioSecur (Personal MedSystems GmbH), has been approved for use in adults. Read More

View Article and Full-Text PDF

The added value of the electrocardiogram in Noonan syndrome.

Cardiol Young 2021 Aug 12:1-8. Epub 2021 Aug 12.

Department of Pediatrics, Radboud Institute for Health Sciences, Amalia Children's Hospital, Radboud University Medical Center, Nijmegen, The Netherlands.

Noonan syndrome is a genetic disorder characteried by short stature, typical facial features, developmental delay, and CHD. In this single-centre retrospective study, we analysed typical Noonan syndrome-related electrocardiographic features in 95 patients with clinically and molecularly confirmed Noonan syndrome. Typical Noonan syndrome-related electrocardiographic features are left axis deviation, small left precordial R-waves, large right precordial S-waves, abnormal Q-wave, and abnormal wide QRS complex. Read More

View Article and Full-Text PDF

Reappraisal of electrocardiographic criteria for localization of idiopathic outflow region ventricular arrhythmias.

Heart Rhythm 2021 Nov 8;18(11):1959-1965. Epub 2021 Aug 8.

Division of Cardiology, Department of Medicine, Weill Cornell Medicine - New York Presbyterian Hospital, New York, New York. Electronic address:

Background: Electrocardiographic (ECG) criteria have been proposed to localize the site of origin of outflow region ventricular arrhythmias (VAs). Many factors influence the QRS morphology of VAs and may limit the accuracy of these criteria.

Objective: The purpose of this study was to assess the accuracy of ECG criteria that differentiate right from left outflow region VAs and localize VAs within the aortic sinus of Valsalva (ASV). Read More

View Article and Full-Text PDF
November 2021

Evaluating of Red Blood Cell Distribution Width, Comorbidities and Electrocardiographic Ratios as Predictors of Prognosis in Patients with Pulmonary Hypertension.

Diagnostics (Basel) 2021 Jul 20;11(7). Epub 2021 Jul 20.

Epidemiology and Statistics Department, National Institute of Respiratory Diseases Ismael Cosio Villegas, Mexico City 14080, Mexico.

Pulmonary hypertension is a rare condition that impairs patients' quality of life and life expectancy. The development of noninvasive instruments may help elucidate the prognosis of this cardiorespiratory disease. We aimed to evaluate the utility of routinely performed noninvasive test results as prognostic markers in patients with pulmonary hypertension. Read More

View Article and Full-Text PDF

Stable Gastric Pentadecapeptide BPC 157 Therapy for Monocrotaline-Induced Pulmonary Hypertension in Rats Leads to Prevention and Reversal.

Biomedicines 2021 Jul 15;9(7). Epub 2021 Jul 15.

Department of Pharmacology, School of Medicine, University of Zagreb, Salata 11, P.O. Box 916, 10000 Zagreb, Croatia.

Monocrotaline selectively injures the lung's vascular endothelium and induces pulmonary arterial hypertension. The stable gastric pentadecapeptide BPC 157 acts as a prototype cytoprotective agent that maintains endothelium, and its application may be a novel therapy. Besides, BPC 157 prevents and reverses thrombosis formation, maintains platelet function, alleviates peripheral vascular occlusion disturbances, and has anti-arrhythmic and anti-inflammatory effects. Read More

View Article and Full-Text PDF

Point-of-Care Ultrasonography Saves the Day in Dilated Cardiomyopathy: A Rare Presentation of Hyperhomocysteinemia.

Cureus 2021 Jul 28;13(7):e16699. Epub 2021 Jul 28.

Emergency Medicine, Trinity West Medical Center, Steubenville, USA.

Here, we report a case of hereditary hyperhomocysteinemia presenting as dilated cardiomyopathy which was successfully diagnosed using a combination of point-of-care ultrasonography (POCUS) and echocardiogram (ECHO). A 39-year-old Caucasian male with a family history of homocystinuria and early deaths in adult male members from cardiovascular disease presented with complaints of purplish discoloration and 4/10 pain in bilateral feet along with severe nausea/vomiting for the last two days. Physical examination was significant for tachycardia, low normal mean arterial pressures, dry mucous membranes, right basilar crepitations, S3 gallop with holosystolic murmur along with peripheral cyanosis, and pitting edema. Read More

View Article and Full-Text PDF

Electrocardiographic findings in true acute left main coronary total occlusion a subanalisys from ATOLMA registry.

J Electrocardiol 2021 Sep-Oct;68:48-52. Epub 2021 Jul 27.

Cardiology Department, Hospital Puerta del Mar, Cádiz, Spain; Instituto de Investigación e Innovación en Ciencias Biomédicas de Cádiz, INiBICA, Spain.

Introduction: Acute total occlusion of the left main coronary artery (ATOLMA) usually leads to a catastrophic presentation. Prediction of ATOLMA by electrocardiogram (ECG) may contribute to early detection and reperfusion. Limited data have been reported previously. Read More

View Article and Full-Text PDF
October 2021

Novel ECG features and machine learning to optimize culprit lesion detection in patients with suspected acute coronary syndrome.

J Electrocardiol 2021 Jul 23. Epub 2021 Jul 23.

Department of Acute & Tertiary Care Nursing, PA, USA; Department of Emergency Medicine, PA, USA; Division of Cardiology at University of Pittsburgh, PA, USA. Electronic address:

Background: Novel temporal-spatial features of the 12‑lead ECG can conceptually optimize culprit lesions' detection beyond that of classical ST amplitude measurements. We sought to develop a data-driven approach for ECG feature selection to build a clinically relevant algorithm for real-time detection of culprit lesion.

Methods: This was a prospective observational cohort study of chest pain patients transported by emergency medical services to three tertiary care hospitals in the US. Read More

View Article and Full-Text PDF

Electrocardiographic "Northwest QRS Axis" in the Brugada Syndrome: A Potential Marker to Predict Poor Outcome.

JACC Case Rep 2020 Nov 7;2(14):2230-2234. Epub 2020 Oct 7.

Cardiovascular Division, Free University of Brussels (UZ Brussel) VUB, Brussels, Belgium.

Conduction delay in the right ventricular outflow tract as manifested in the electrocardiogram constitutes a high-risk predictor of ventricular arrhythmias in patients with Brugada syndrome. We present a case with a right QRS axis between -90° and ±180°. This feature has never been reported in the context of Brugada syndrome. Read More

View Article and Full-Text PDF
November 2020

Adapted ST analysis during labor: relative versus absolute ST events, a case-control study.

J Matern Fetal Neonatal Med 2021 Jul 25:1-6. Epub 2021 Jul 25.

Department of Obstetrics and Gynecology, Máxima Medical Center, Veldhoven, The Netherlands.

Background: The value of ST analysis of the fetal electrocardiogram during labor to lower asphyxia and cesarean section rates is uncertain. Physiological variation of the electrical heart axis between fetuses may explain false alarms in conventional ST analysis (absolute ST analysis). ST events (alarms) based on relative T/QRS rises (relative ST analysis) correct for this variation and may improve diagnostic accuracy of ST analysis. Read More

View Article and Full-Text PDF

Predictive value of frontal QRS-T angle after cardiac resynchronization therapy.

J Electrocardiol 2021 Sep-Oct;68:24-29. Epub 2021 Jul 3.

Department of Cardiology, Sancaktepe Sehit Profesor Ilhan Varank Education and Research Hospital, Istanbul, Turkey. Electronic address:

Objective: It is practical and useful to detect patients who benefit from cardiac resynchronization therapy (CRT) by electrocardiographic (ECG) methods. In this study, the predictive role of the frontal QRS-T angle and other ECG parameters was evaluated in CRT responder patients.

Method: Seventy-seven consecutive patients with left ventricular ejection fraction (LVEF) ≤ 35%, New York Heart Association (NYHA) classes II-III, ambulatory class IV and normal sinus rhythm, who had complete left bundle branch block and were treated with CRT were included in this study. Read More

View Article and Full-Text PDF
October 2021

Effect of Nonselective His Bundle Pacing on Delayed Myocardial Activation in Left-axis Deviation and Left Bundle Branch Block.

J Innov Card Rhythm Manag 2021 Jul 15;12(7):4577-4585. Epub 2021 Jul 15.

McLaren Bay Region Medical Center, Bay City, MI, USA.

It has been suggested that nonselective His bundle pacing (NS-HBP) corrects terminal conduction delay in right bundle branch block by early excitation of the right ventricular free wall. A similar analysis of NS-HBP, in patients with left bundle branch block (LBBB) and left-axis deviation (LAD) has not been done. Therefore, we compared the baseline QRS parameters in LAD and LBBB during NS-HBP and selective HBP (S-HBP). Read More

View Article and Full-Text PDF

The Relationship between Insulin Resistance and Spatial QRS-T Angle in American Adults.

Acta Cardiol Sin 2021 Jul;37(4):427-433

Department of Epidemiology, College of Public Health.

Background: Insulin resistance can impair the electrical conductivity of the heart. Spatial QRS-T axis reflects ventricular depolarization and repolarization. The relationship between insulin resistance and spatial QRS-T angle has not been examined in the general population. Read More

View Article and Full-Text PDF

Epilepsy duration is an independent factor for electrocardiographic changes in pediatric epilepsy.

Epilepsia Open 2021 Sep 19;6(3):588-596. Epub 2021 Jul 19.

Department of Pediatrics, Baylor College of Medicine, Houston, TX, USA.

Objective: Cardiac alterations represent a potential epilepsy-associated comorbidity. Whether cardiac changes occur as a function of epilepsy duration is not well understood. We sought to evaluate whether cardiac alterations represented a time-dependent phenomenon in pediatric epilepsy. Read More

View Article and Full-Text PDF
September 2021

AL type cardiac amyloidosis: a devastating fatal disease.

J Community Hosp Intern Med Perspect 2021 10;11(3):407-412. Epub 2021 May 10.

Department of Medicine, Allegheny Health Network, Pittsburgh, USA.

Introduction: Cardiac amyloidosis is a rare entity with a grave prognosis. Due to the low index of suspicion secondary to non-specific symptoms, it is often diagnosed at an advanced stage with multi-organ involvement.

Methods: We report a case of systemic AL amyloidosis with predominant cardiac and renal involvement associated with multiple myeloma. Read More

View Article and Full-Text PDF

Integrating Electrocardiography and Vectorcardiography in the Differential Diagnosis of Wide Complex Tachycardia in a Patient with Left Ventricular Noncompaction: A Case Report and Brief Literature Review.

Diagnostics (Basel) 2021 Jun 24;11(7). Epub 2021 Jun 24.

Cluj County Emergency Hospital, 400000 Cluj-Napoca, Romania.

A 69-year-old woman with a history of hypertension and obesity, hospitalized with atypical chest pain, was diagnosed with left ventricular noncompaction. In-hospital monitoring of the cardiac rhythm revealed multiple episodes of atrial tachycardia and one episode of wide complex tachycardia (WCT) with left bundle branch block-like morphology and a right superior QRS axis. The electrocardiographic criteria were suggestive of a supraventricular origin of the WCT. Read More

View Article and Full-Text PDF

A Visual Resolution of Cardiotoxicity: A Case Report of Digoxin-Induced Bidirectional Ventricular Tachycardia.

Cureus 2021 May 20;13(5):e15134. Epub 2021 May 20.

Cardiology, Mount Sinai Hospital, New York, USA.

Digoxin is rarely used in modern cardiovascular disease management. Therefore, digoxin toxicity has been infrequently encountered and it is paramount to diagnose in a timely fashion. Bidirectional ventricular tachycardia is an unusual arrhythmia wherein every other beat has a different QRS axis as it travels alternately down different conduction pathways. Read More

View Article and Full-Text PDF


J Zoo Wildl Med 2021 Jun;52(2):507-519

Department of Zoology, University of British Columbia, Vancouver, BC V6T 1Z4, Canada.

Pinniped hearts have been well described via dissection, but in vivo measurements of cardiac structure, function, and electrophysiology are lacking. Electrocardiograms (ECGs) were recorded under anesthesia from eight Steller sea lions (), five northern fur seals (), and one walrus () to investigate cardiac electrophysiology in pinnipeds. In addition, echocardiograms were performed on all eight anesthetized Steller sea lions to evaluate in vivo cardiac structure and function. Read More

View Article and Full-Text PDF

Aortic valve implantation-induced conduction block as a framework towards a uniform electrocardiographic definition of left bundle branch block.

Neth Heart J 2021 Apr 30. Epub 2021 Apr 30.

Department of Cardiology, University Hospital Ghent, Ghent, Belgium.

Introduction: New-onset left bundle branch block (LBBB) following transcatheter or surgical aortic valve replacement (LBBB) implies a proximal pathogenesis of LBBB. This study compares electrocardiographic characteristics and concordance with LBBB definitions between LBBB and non-procedure-induced LBBB controls (LBBB).

Methods: All LBBB patients at Ghent University Hospital between 2013 and 2019 were enrolled in the study. Read More

View Article and Full-Text PDF