Normal limits of the electrocardiogram derived from a large database of Brazilian primary care patients.
BMC Cardiovasc Disord
; 17(1): 152, 2017 06 13.
Article
em En
| MEDLINE
| ID: mdl-28610624
ABSTRACT
BACKGROUND:
Knowledge of the normal limits of the electrocardiogram (ECG) is mandatory for establishing which patients have abnormal ECGs. No studies have assessed the reference standards for a Latin American population. Our aim was to establish the normal ranges of the ECG for pediatric and adult Brazilian primary care patients.METHODS:
This retrospective observational study assessed all the consecutive 12-lead digital electrocardiograms of primary care patients at least 1 year old in Minas Gerais state, Brazil, recorded between 2010 and 2015. ECGs were excluded if there were technical problems, selected abnormalities were present or patients with selected self-declared comorbidities or on drug therapy. Only the first ECG from patients with multiple ECGs was accepted. The University of Glasgow ECG analysis program was used to automatically interpret the ECGs. For each variable, the 1st, 2nd, 50th, 98th and 99th percentiles were determined and results were compared to selected studies.RESULTS:
A total of 1,493,905 ECGs were recorded. 1,007,891 were excluded and 486.014 were analyzed. This large study provided normal values for heart rate, P, QRS and T frontal axis, P and QRS overall duration, PR and QT overall intervals and QTc corrected by Hodges, Bazett, Fridericia and Framingham formulae. Overall, the results were similar to those from other studies performed in different populations but there were differences in extreme ages and specific measurements.CONCLUSIONS:
This study has provided reference values for Latinos of both sexes older than 1 year. Our results are comparable to studies performed in different populations.Palavras-chave
Texto completo:
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Base de dados:
MEDLINE
Assunto principal:
Atenção Primária à Saúde
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Doenças Cardiovasculares
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Eletrocardiografia
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Mineração de Dados
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Frequência Cardíaca
Tipo de estudo:
Guideline
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Observational_studies
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Prognostic_studies
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Risk_factors_studies
Limite:
Adolescent
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Adult
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Aged
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Aged80
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Child
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Child, preschool
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Female
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Humans
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Infant
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Male
País como assunto:
America do sul
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Brasil
Idioma:
En
Ano de publicação:
2017
Tipo de documento:
Article