The aim of the present study was to analyse age-related differences in the morphology of QRS complex and ST-T segment of right-sided chest ECG leads (V3R-V6R) in normal subjects.One hundred ninety-five subjects evaluated for competitive sport training were divided into 2 groups according to age: group A (18-35 years) 77 subjects; group B (36-65 years) 118 subjects. All subjects underwent a complete clinical examination, conventional 12-lead ECG with right-sided chest leads, spirometric tests, a maximal stress-test (Bruce protocol), and a cardiac ultrasound study. None had signs or symptoms of cardiopulmonary disease nor of thoracic abnormalities, and all had normal standard ECGs.An rS morphology in V3R-V4R was observed in 92\%-84\% and 92\%-81\% of subjects in groups A and B, respectively (p = NS). The QS morphology in V6R was observed in 15\% of subjects in group A and in 11\% in group B (p = NS). Negative T-waves in V6R were more often observed in group A than B (94\% vs 85\%, p < 0.03). Isoelectric T-waves in V3R were found in 10\% of subjects in group A and 21\% in group B (p < 0.04). The amplitude of R-wave was always higher in group A (p < 0.01). An upsloping ST-T segment (0.5-1 mm) was observed only in V3R-V4R, with a prevalence of 23\% in group A and 13\% in group B in V3R (p < 0.05).No significant differences were observed between the 2 groups as to QRS complex of the right-sided ECG leads. A QS morphology may be observed even in normal subjects. The polarity of T-wave is quite variable, but in V6R it is most often negative among young people. Elevation of ST-T segment may be observed only in V3R and V4R, and more often in young subjects in the former lead.

[Analysis of right electrocardiographic leads in 195 normal subjects].

RIBICHINI, Flavio Luciano;
1994

Abstract

The aim of the present study was to analyse age-related differences in the morphology of QRS complex and ST-T segment of right-sided chest ECG leads (V3R-V6R) in normal subjects.One hundred ninety-five subjects evaluated for competitive sport training were divided into 2 groups according to age: group A (18-35 years) 77 subjects; group B (36-65 years) 118 subjects. All subjects underwent a complete clinical examination, conventional 12-lead ECG with right-sided chest leads, spirometric tests, a maximal stress-test (Bruce protocol), and a cardiac ultrasound study. None had signs or symptoms of cardiopulmonary disease nor of thoracic abnormalities, and all had normal standard ECGs.An rS morphology in V3R-V4R was observed in 92\%-84\% and 92\%-81\% of subjects in groups A and B, respectively (p = NS). The QS morphology in V6R was observed in 15\% of subjects in group A and in 11\% in group B (p = NS). Negative T-waves in V6R were more often observed in group A than B (94\% vs 85\%, p < 0.03). Isoelectric T-waves in V3R were found in 10\% of subjects in group A and 21\% in group B (p < 0.04). The amplitude of R-wave was always higher in group A (p < 0.01). An upsloping ST-T segment (0.5-1 mm) was observed only in V3R-V4R, with a prevalence of 23\% in group A and 13\% in group B in V3R (p < 0.05).No significant differences were observed between the 2 groups as to QRS complex of the right-sided ECG leads. A QS morphology may be observed even in normal subjects. The polarity of T-wave is quite variable, but in V6R it is most often negative among young people. Elevation of ST-T segment may be observed only in V3R and V4R, and more often in young subjects in the former lead.
Adolescent, Adult, Age Factors, Aged, Electrocardiography, Female, Humans, Male, Middle Aged, Reference Values, Sports, Ventricular Function; Right; physiology
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11562/470406
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