To assess the predictive value of coronary events reflected by changes in R-wave amplitude after exercise, 146 patients with angiographically documented coronary heart disease were studied. All patients were followed up for 6 years, during which time myocardial infarction and death of cardiovascular origin were considered endpoints. The incidence of events in patients in whom R-wave amplitude decreased (normal response) and in those in whom R-wave amplitude did not change or increase (abnormal response) were compared. The incidence of coronary events in patients with a normal response was 23% and in those with an abnormal response, 45.8% (p less than 0.01). Correlating the results with several noninvasive and angiographic variables, an abnormal R-wave response showed a significantly higher rate of events in the subsets of patients with prior myocardial infarction, absence of cardiomegaly, maximal functional capacity lower than 4 METs, maximal heart rate higher than 140 beats/min and abnormal left ventricular function. Thus, the changes in R-wave amplitude after exercise is a variable that should be taken into account when assessing the risk of future events in patients with coronary heart disease.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1016/s0002-9149(84)80069-7 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Left Bundle Branch Area Pacing Versus Right Ventricular Pacing in Patients With Atrioventricular Block: A Systematic Review and Meta-Analysis.
J Cardiovasc Electrophysiol
January 2025
Division of Cardiology, Thomas Jefferson University Hospital, Philadelphia, Pennsylvania, USA.
Background: Left bundle branch area pacing (LBBAP) is a new technique for patients with atrioventricular block (AVB) and preserved left ventricular ejection fraction (LVEF), potentially offering better cardiac function than right ventricular pacing (RVP).
Methods: We searched databases and registries for studies that compared LBBAP with RVP in patients with AVB and preserved LVEF. We extracted data on various outcomes and pooled the effect estimates using random-effects models.
The Relationship Between the Kansas City Cardiomyopathy Questionnaire and Electrocardiographic Parameters in Predicting Outcomes After Cardiac Resynchronization Therapy.
Life (Basel)
November 2024
Department of Cardiology, Bagdasar-Arseni Emergency Hospital, Carol Davila University of Medicine and Pharmacy, 022328 Bucharest, Romania.
Background: Cardiac resynchronization therapy (CRT) is an essential treatment for patients with symptomatic heart failure and ventricular conduction abnormalities. Low-ejection-fraction (EF) cardiomyopathy often involves a wide QRS complex displaying a left bundle branch block (LBBB) morphology and markedly delayed activation of the LV lateral wall. Following CRT, patients with heart failure and LBBB have better outcomes and quality-of-life improvements.
View Article and Find Full Text PDFIntraoperative ST Segment Depression During General Anesthesia in a Child: Early Detection of Hypertrophic Cardiomyopathy.
Cardiol Res
December 2024
Department of Anesthesiology & Pain Medicine, Nationwide Children's Hospital, Columbus, OH, USA.
Article Synopsis
- Continuous electrocardiographic (ECG) monitoring during surgery in infants and children is essential to detect potential myocardial pathologies, despite the rarity of these issues in pediatric patients.
- A case is presented involving a 2-year-old child who showed ST segment depression and increased R wave amplitude during surgery, which led to the discovery of undiagnosed hypertrophic cardiomyopathy postoperatively.
- The findings emphasize the importance of recognizing ECG changes and the need for thorough evaluation to prevent complications during and after surgery, even when patients appear asymptomatic.
A case report of pre-implantation feasibility test for combining leadless pacemaker and subcutaneous implantable cardioverter-defibrillator in adult congenital heart disease.
J Cardiol Cases
December 2024
Department of Cardiovascular Medicine, Osaka University Graduate School of Medicine, Suita, Osaka, Japan.
Unlabelled: New cardiac implantable electronic devices (CIEDs), such as leadless pacemakers and subcutaneous implantable cardioverter defibrillators (S-ICDs), are being used in patients with adult congenital heart disease. The selection of CIEDs often requires careful consideration due to technical challenges posed by a unique heart structure. A 27-year-old man following a surgical tetralogy of Fallot (TOF) repair developed non-sustained ventricular tachycardia, sick sinus syndrome, and complete atrioventricular block.
View Article and Find Full Text PDFElectrocardiographic parameters of chemically immobilized giant anteaters (Myrmecophaga tridactyla).
Vet Res Commun
November 2024
Department of Veterinary Clinics, Faculty of Veterinary Medicine and Animal Science, São Paulo State University, Botucatu, São Paulo, Brazil.
The giant anteater (Myrmecophaga tridactyla) is a vulnerable species that is threatened mostly due to anthropogenic pressure. The anteater is a highly specialized insectivore, challenging the species' ex situ maintenance and conservation efforts. Several dietary-associated health issues have been reported in captive anteaters, including heart conditions such as dilated cardiomyopathy.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!