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Invasive measures of diastolic function: Left panel shows calculation of the time constant of LV isovolumic pressure fall (tau). Recordings from Smiseth et al. [29]. Right panel shows LV diastolic pressure–volume relations from normal controls (solid line) and patients with normal EF, diastolic heart failure (DHF) (dotted line), and reduced EF, systolic heart failure (SHF) (dashed line) [30]
