Agreement analysis of Stroke Volume and Cardiac Output measurement between a Oscillometric Device and Transthoracic Echocardiogram in normotensive individuals: a preliminary report
Análise de concordância da medida do volume sistólico e do débito cardíaco entre aparelho oscilométrico e ecocardiograma transtorácico em indivíduos normotensos: relato preliminar
Alejandro Godoy, Alejandro Contreras, Aldo Tabares
Abstract
Introduction
The evaluation of stroke volume (SV) is useful in research and patient care.
To accomplish this, an ideal device should be noninvasive, continuous, reliable, and reproducible. The Mobil-O-Graph (MOG) is a noninvasive oscillometric matrix validated for measuring aortic and peripheral blood pressure, which through conversion algorithms, can estimate hemodynamic parameters.
Objectives
To compare the Mobil-O-Graph (MOG) measurement of stroke volume, cardiac output, and cardiac index with the transthoracic echocardiogram (TTE).
Methods
Healthy volunteers aged 18 years or older were included. Two-dimensional TTEs were performed by a single operator. Subsequently, the measurement of noninvasive hemodynamics with MOG was performed with the operator blind to the results of the echocardiogram. Correlation analyses between stroke volume, cardiac output, and cardiac index parameters were performed. The degree of agreement between the methods was verified using the Bland Altman method.
Results
A total of 38 volunteers were enrolled with a mean age of 27.6 ± 3.8 years; 21 (55%) were male The SV by TTE was 76.8 ± 19.5 mL and 75.7 ± 19.3 mL by MOG, Rho = 0.726, p < 0.0001. The CO by TTE was 5.04 ± 0.8 mL.min-1 and 5.1 ± 0.8 mL.min-1 by MOG Rho = 0.510, p = 0.001. Bland-Altman plots showed a good concordance between the two techniques.
Conclusions
Our study shows that the measurement of SV and CO by noninvasive hemodynamics with the MOG device offers a good concordance with the TTE with very few values beyond the confidence limits.
Keywords
Resumo
Introdução
A avaliação do volume sistólico (VS) é útil na pesquisa e no atendimento ao paciente. Para conseguir isso, um dispositivo ideal deve ser não invasivo, contínuo, confiável e reprodutível. O Mobil-O-Graph (MOG) é uma matriz oscilométrica não invasiva validada para medir a pressão arterial aórtica e periférica, que por meio de algoritmos de conversão pode estimar parâmetros hemodinâmicos.
Objetivos
Comparar a medida MOG do volume sistólico, débito cardíaco e índice cardíaco com o ecocardiograma transtorácico (ETT).
Métodos
Foram incluídos voluntários saudáveis com idade igual ou superior a 18 anos. ETTs bidimensionais foram realizados por um único operador. Posteriormente, a medida da hemodinâmica não invasiva com MOG foi realizada com o operador cego para os resultados do ecocardiograma. Foram realizadas análises de correlação entre o volume sistólico, o débito cardíaco e os parâmetros do índice cardíaco. O grau de concordância entre os métodos foi verificado pelo método de Bland-Altman.
Resultados
Um total de 38 voluntários foram inscritos com idade média de 27,6 ± 3,8 anos; 21 (55%) eram do sexo masculino. O VS por ETT foi de 76,8 ± 19,5 mL e 75,7 ± 19,3 mL por MOG, Rho = 0,726, p < 0,0001. O DC por ETT foi de 5,04 ± 0,8 mL.min-1 e 5,1 ± 0,8 mL.min-1 por MOG Rho = 0,510, p = 0,001. Os gráficos de Bland-Altman mostraram uma boa concordância entre as duas técnicas.
Conclusões
Nosso estudo mostra que a medição de VS e DC por hemodinâmica não invasiva com o dispositivo MOG oferece uma boa concordância com o ETT com poucos valores além dos limites de confiança.
Palavras-chave
References
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