Figure 5

Modified Bland-Altman analysis. Bland-Altman [11] graph showing the difference of measured Aortic flow between the old and new ECG-trigger algorithm (mean difference/bold continuous line: 0.0 ml; upper and lower limits of agreement/dashed lines: ± 10.9 ml). The Bland-Altman graph has been modified by adding lines depicting the 5% and 10% difference of the mean Aortic flow. Red dots: “bad old ECG trigger cases”, specifically cases in which the average grading of the old ECG trigger algorithm was graded as worse than “bad”(trigger points in a different area of the QRS-loop). Red/yellow dots: “bad old ECG trigger cases”, specifically cases in which both the average grading of the old ECG trigger algorithm was worse than “bad”(trigger points in a different area of the QRS-loop) and that had > 2 false positive or false negative triggered QRS-complexes. Violet dot: “bad new ECG trigger case”, specifically only case in which the average grading of the new ECG trigger algorithm was graded worse than “bad”(trigger points in a different area of the QRS-loop). Black dots: “good old and new ECG trigger case”, note that all these cases lie within the 10% difference lines, depicting good agreement between measured Aortic flow using the old and new ECG-trigger algorithm.