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Complete atrioventricular block with QRS complexes of variable amplitude
M Curione1, R L Putini, R Iulianella
1Department of Internal Medicine, Coronary Care Unit, University of Rome, La Sapienza, Italy.
Journal of Electrocardiology
|October 1, 1990
Summary
Complete atrioventricular (AV) block can cause varying QRS amplitudes linked to PR interval length. This variability correlates with altered mitral flow and impaired ventricular diastolic filling.
Area of Science:
- Cardiology
- Electrophysiology
- Echocardiography
Background:
- Complete atrioventricular (AV) block is a cardiac condition affecting electrical signal transmission.
- Narrow QRS complexes in AV block suggest supraventricular origin of ventricular activation.
Observation:
- Nonrespiratory variations in QRS amplitude were noted in a patient with complete AV block.
- These amplitude changes correlated with the PR interval length.
Findings:
- Analysis of QRS complexes grouped by atrial systole timing revealed significant variations.
- Doppler echocardiography showed PR interval-dependent changes in mitral flow.
- A significant inverse correlation exists between QRS amplitude variability and ventricular diastolic filling.
Implications:
- This electrocardiographic pattern provides insights into the mechanical consequences of AV block.
- Understanding QRS variability may aid in assessing diastolic function in AV block patients.
- Further research can explore the clinical significance of this observed phenomenon.