Complete atrioventricular block with QRS complexes of variable amplitude.
Nonrespiratory QRS amplitude variations related to PR interval length were observed in a case of complete atrioventricular (AV) block with narrow QRS complexes. This electrocardiographic pattern was studied, taking into consideration the greater deflection of the ventricular complexes (R- or S-wave) on each standard lead and by analyzing three groups of QRS (A, B, C) divided in relation to the different timing of the atrial systole. A significant variation appears in the entity of the mitral flow, as assessed by Doppler echocardiography evaluation, related to PR interval length, and a significant inverse correlation was found between QRS variability and ventricular diastolic filling.
Curione
M
M
Department of Internal Medicine, Coronary Care Unit, University of Rome, La Sapienza, Italy.
Putini
R L
RL
Iulianella
R
R
Puletti
M
M
D000293:Adolescent; D001283:Atrioventricular Node / Q000503:physiopathology; D015150:Echocardiography, Doppler; D004562:Electrocardiography; D005260:Female; D006327:Heart Block / Q000175:diagnosis* / Q000000981:diagnostic imaging; D006801:Humans; D013318:Stroke Volume / Q000502:physiology