Circadian variation
VE variability was significantly higher in the RVOT than the LVOT cohort in all quartiles of the day (supplementary data Table 2), however the mean difference was greatest in the 06:00-12:00 quartile; mean CoV RVOT vs LVOT 1.15 (± 0.55) vs 0.36 (± 0.15), mean difference 0.79, p <0.0001. Figure 3.