Effects of breath-holding position on the QRS amplitudes in the routine electrocardiogram.
J Electrocardiol
; 42(5): 400-4, 2009.
Article
em En
| MEDLINE
| ID: mdl-19520382
ABSTRACT
BACKGROUND:
The effects of different breath-holding positions during electrocardiographic (ECG) recording on the QRS complex are unknown.METHODS:
In 73 subjects, ECG recordings were made in 3 different breath-holding positions normal expiration (rest), maximum inspiration, and maximum expiration. QRS wave excursions and changes in the frontal electrical heart axis were analyzed.RESULTS:
The mean effect of respiration in most leads was small (> or =1 mm only in the S wave in V(4) and in the R wave in V(5)), but the degree of interindividual variability was often substantial, with standard deviations of > or =1.5 mm in multiple leads.CONCLUSION:
The effect of different extreme breath-holding positions on the QRS complex is on average small but may be substantial in individuals. Lack of standardization of breathing instructions during recording of the ECG may result in differences in application of amplitude criteria and poorer reproducibility.
Texto completo:
1
Base de dados:
MEDLINE
Assunto principal:
Estenose da Valva Aórtica
/
Próteses Valvulares Cardíacas
/
Mecânica Respiratória
/
Artefatos
/
Eletrocardiografia
Tipo de estudo:
Diagnostic_studies
/
Etiology_studies
Limite:
Aged
/
Humans
/
Male
Idioma:
En
Revista:
J Electrocardiol
Ano de publicação:
2009
Tipo de documento:
Article
País de afiliação:
Holanda