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Figure 1 An example of pressure–volume loops obtained by transient occlusion of the inferior vena cava using a vascular occlusion balloon catheter during right ventricular apical (A), left ventricular free wall (B), and biventricular pacing (C) in one of our patients with normal left ventricular systolic function. The end-systolic pressure–volume relation line slope clearly increased during left ventricular free wall and biventricular pacing.
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