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Effects of volume and pressure overloads and myocardial hypertrophy on exercise-induced changes in electrocardiographic QRS amplitude
- Source :
- Japanese circulation journal. 57(6)
- Publication Year :
- 1993
-
Abstract
- To investigate the effects of volume and pressure overloads and myocardial hypertrophy on exercise-induced changes in QRS amplitude, we reviewed treadmill exercise electrocardiograms. In 10 normal young men, Rv5 amplitude decreased and Sv1 amplitude increased at peak exercise, and returned to the resting value in the recovery period. In 10 patients with aortic regurgitation, Rv5 and Sv1 amplitudes increased after 5 min of recovery. In 12 patients with essential hypertension and 10 with idiopathic hypertrophic non-obstructive cardiomyopathy, Rv5 amplitude remained unchanged or higher at peak exercise compared with the resting value, but patterns of serial changes were similar to that of normal subjects. In 9 patients with atrial septal defect, R'v1 amplitude increased with exercise, whereas it remained unchanged in 12 with isolated complete right bundle branch block. In 5 patients with mitral stenosis, Sv1 amplitude decreased at peak exercise. In conclusion, changes in QRS amplitude with exercise are influenced by hemodynamic abnormality and myocardial hypertrophy, and a major determinant of these serial changes seems to be the change in ventricular volume.
- Subjects :
- Adult
Male
medicine.medical_specialty
Heart disease
Physiology
Heart Ventricles
Aortic Valve Insufficiency
Cardiomyopathy
Hemodynamics
Cardiomegaly
Essential hypertension
Heart Septal Defects, Atrial
Muscle hypertrophy
QRS complex
Electrocardiography
Internal medicine
medicine
Humans
Mitral Valve Stenosis
Exercise physiology
Exercise
Aged
medicine.diagnostic_test
business.industry
Middle Aged
medicine.disease
Hypertension
Cardiology
Female
Cardiology and Cardiovascular Medicine
business
Subjects
Details
- ISSN :
- 00471828
- Volume :
- 57
- Issue :
- 6
- Database :
- OpenAIRE
- Journal :
- Japanese circulation journal
- Accession number :
- edsair.doi.dedup.....acab3c841d55980ed2895bc4c01fd3b9