The Relationship Between R Amplitude in Lead V_5(RV_5)and Left Ventricular Mass in the Groups of Adolescent Subjects Classified by Body Composition
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概要
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How the amplitude of the R wave in lead V_5(RV_5)of the ECG represents the left ventricular(LV)mass was investigated in 894 students aged 15(boys : 545, girls : 349). The influence of body composition[ie, percentage of body fat(%fat)]was taken into consideration. A significant correlation was found between RV_5 amplitude and LV mass for both genders. However, the relationship was stronger for boys than for girls. The students were then divided into 3 groups ; that is, those at either the top or bottom 10th percentile(low or high-fat range)and the rest of the students(middle-fat range), depending on the % fat calculated by the bioelectrical impedance method. The significant correlation between RV_5 and LV mass was found only for the 2 groups of boys whose percentage fat was in the low or middle-fat range. The correlation coefficients were 0.40 and 0.34, respectively. Moreover, in the boys' low-fat range, the RV_5 of students whose LV mass was large(390th percentile), was significantly higher(p<0.01)than in the other ranges. Setting a particular cutoff point of RV_5 in the low-fat range of boys improved sensitivity as well as specificity(20-30% better among all boys)for detecting large LV mass. These observations suggest that classification of subjects by body composition could be improve the reliability of ECG assessment for left ventricular hypertrophy, although the gender and number of subjects in whom improvement is expected are limited.
- 社団法人日本循環器学会の論文
- 1998-11-20
著者
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HAYANO Junichiro
The Third Departmenr of Internal Medicine,Nagoya City University Medical School
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Nagashima Masami
Department Of Pediatrics Nagoya University School Of Medicine
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Takada Kazuo
Nagoya Medical Association Health Center
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Sugita Seiko
The Third Department Of Internal Medicine Nagoya City University Medical School
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Hayano Junichiro
The Third Department Of Internal Medicine Nagoya City University Medical School
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Takada Kazuo
The Third Department of Internal Medicine, Nagoya City University Medical School
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Takada Haruko
Department of Hygiene, Gifu University School of Medicine
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Takada Haruko
Department Of Hygiene Gifu University School Of Medicine
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Nagashima Masami
Department Of Pediatrics School Of Medicine Nagoya University
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Nagashima Masami
Department Of Health Aichi Prefectural Government
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Takada Kazuo
The Third Department Of Internal Medicine Nagoya City University Medical School
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Nagashima Masami
Department Of Cardiology Aichi Children's Health And Medical Center
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