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Medicina is published by MDPI from Volume 54 Issue 1 (2018). Articles in this Issue were published by another publisher in Open Access under a CC-BY (or CC-BY-NC-ND) licence. Articles are hosted by MDPI on mdpi.com as a courtesy and upon agreement with Lithuanian Medical Association, Lithuanian University of Health Sciences, and Vilnius University.
Open AccessArticle

Bland–Altman analysis as an alternative approach for statistical evaluation of agreement between two methods for measuring hemodynamics during acute myocardial infarction

Department of Cardiology, Kaunas University of Medicine, Lithuania
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Medicina 2007, 43(3), 208; https://doi.org/10.3390/medicina43030025
Received: 11 September 2006 / Accepted: 28 November 2006 / Published: 3 December 2006
Background and objective. Evaluation of hemodynamics in patients with acute myocardial infarction is crucial. In clinical practice, the comparison of a new measurement technique with an established one is often needed to see whether they agree sufficiently for the new to replace the old. Such investigations are often analyzed inappropriately, notably by using correlation coefficients. Our objective is to present an alternative approach, suggested by D. G. Altman and J. M. Bland, based on graphical techniques and simple calculations, for evaluation of the agreement of two methods – intermittent thermodilution (recognized and accepted as a “gold standard” for hemodynamic monitoring) and impedance cardiography (newly introduced method).
Patients and methods
. A total of 34 patients (20 (58.8%) men and 14 (41.2%) women) were investigated according to the study protocol at Kaunas University of Medicine Hospital. A prospective controlled study was designed to compare two different methods – intermittent thermodilution and impedance cardiography – of cardiac output measurement simultaneously in patients with acute myocardial infarction. Statistical analysis was performed with Bland–Altman and linear regression.
Results
. A total of 34 paired measurements were carried out in 34 patients at the initiation of hemodynamic monitoring and 30 paired measurements in 32 patients after subsequent improvement or stabilization of clinical status. Correlation coefficient ranged from 0.37 to 0.98.
Conclusions
. Bland–Altman analysis is an alternative method for assessing the agreement between two methods of clinical measurement. According to our data, noninvasive technique – impedance cardiography – is a reliable method for hemodynamic monitoring in noncomplicated cases of acute myocardial infarction.
Keywords: acute myocardial infarction; impedance cardiography; pulmonary artery catheter; Bland–Altman analysis; linear regression acute myocardial infarction; impedance cardiography; pulmonary artery catheter; Bland–Altman analysis; linear regression
MDPI and ACS Style

Braždžionytė, J.; Macas, A. Bland–Altman analysis as an alternative approach for statistical evaluation of agreement between two methods for measuring hemodynamics during acute myocardial infarction. Medicina 2007, 43, 208.

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