Normal limits of the electrocardiogram derived from a large database of Brazilian primary care patients

BMC Cardiovascular Disorders

Research Article

Peter W. Macfarlane¹  Paulo R. Gomes²  José L. P. da Silva²  Leonardo B. Ribeiro²  Thales M. M. Santos³  Milena S. Marcolino³  Antonio L. P. Ribeiro³  Daniel M. F. Palhares³ 

[1] Institute of Cardiovascular and Medical Sciences, University of Glasgow, Glasgow, UK;Telehealth Network of Minas Gerais, Hospital das Clínicas, Universidade Federal de Minas Gerais, Avenida Professor Alfredo Balena, 110, 1º Andar, Ala Sul, Sala 107, 30130-100, Belo Horizonte, Minas Gerais, Brazil;Telehealth Network of Minas Gerais, Hospital das Clínicas, Universidade Federal de Minas Gerais, Avenida Professor Alfredo Balena, 110, 1º Andar, Ala Sul, Sala 107, 30130-100, Belo Horizonte, Minas Gerais, Brazil;Medical School, Universidade Federal de Minas Gerais, Avenida Professor Alfredo Balena, 190, 30130-100, Belo Horizonte, Minas Gerais, Brazil;

关键词: Electrocardiogram;    Computers;    Epidemiology;    Intervals;    Waves;   

DOI  :  10.1186/s12872-017-0572-8

 received in 2016-07-07, accepted in 2017-05-16,  发布年份 2017

来源: Springer

【 摘 要 】

BackgroundKnowledge 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.MethodsThis 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.ResultsA 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.ConclusionsThis study has provided reference values for Latinos of both sexes older than 1 year. Our results are comparable to studies performed in different populations.

【 授权许可】

CC BY   
© The Author(s). 2017