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The baseline respiratory variations of the trans-mitral peak E wave velocity (Figure 17) are borderline for constrictive pericarditis (31% increase at the first expiratory beat), but increase to a greatly significant 63% during leg elevation (by increasing venous return and RV-LV preload) (Figure 18). Respiratory variability of the tricuspid E wave is also significant (81%) (Figure 19). An associate finding is a marked respiratory variability of the RVOT flow velocity (Figure 20).