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Representative images of left ventricular pressure-volume relationships during transient inferior vena cava occlusion (top) and speckle-tracking echocardiography in pigs with preserved (bottom left) or impaired global longitudinal strain (GLS, bottom right). A pig with impaired GLS (red line) has a higher left ventricular end-diastolic pressure before inferior vena cava occlusion with a steeper end-diastolic pressure-volume relationship.
