I have been working on different visualizations of the data we see and use every day in the pediatric echo lab.
Consider the following hypothetical patient data:
A simple graph of these individual measurements over time- particularly for pediatric patients- is potentially a bit misleading:
While the graph clearly conveys the information that the coronary artery size changes over time, unless you also happen to know what the normal values are for each point in time, there is no way to know if the change in size is pathologic, or simply due to somatic growth.
This is the entire reason we use z-scores.
So, maybe more to the point- at least for the purpose of trending- would be to graph the z-scores over time:
(This simple LMCA graphing routine can be found here.)
However, neither graph is entirely satisfactory for me.
I want to see both the absolute values and their relationship to normal values… more like this:
- left main coronary artery charting utility
- LAD coronary artery charting utility
- right coronary artery charting utility
They're not perfect (I'd like the z-score to show as a 'tooltip' when hovering over individual data points, and the axes need labels...), but they are a lot more fun. If they seem useful, I may release more of them into the wild.
I'd love to know what anyone else thinks about graphing their pediatric echo data.
(special thanks to the authors of "Normal values for aortic diameters in children and adolescents – assessment in vivo by contrast-enhanced CMR-angiography" for the inspiration)