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Figure 3 Each horizontal line represents a single injection with the two points defining the ends of each line representing the two simultaneous thermodilution measurements (one using the standard technique, one using the dual thermistor technique). The values on the x-axis are computed as the difference between the single injection and the mean of all five injections for an individual patient. The 240 ambient temperature injections are shown on the left graph, and the 240 cooled injections are shown on the right. Note that many injections are represented by short lines that don’t cross the x = 0 vertical axis (that is, the two measurements are similar in magnitude and are either both positive or both negative). With these injections the two techniques provide similar results. In contrast, the injections represented by lines that are long and/or cross x = 0 reveal substantial divergence between the two measurements. Also note that the lines in the right graph tend to be shorter in length and more clustered near the midline, reflecting the slightly better reproducibility between techniques for cooled injections.
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