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Fig. 4 —Median signal intensity normalized to baseline signal
intensity (second image after contrast injection and start of image
acquisition) for patients with and without patent foramen ovale (PFO) and with
and without residual shunt after PFO device implantation. Dashed line at 129%
signal intensity of baseline signal represents proposed cutoff value for
diagnosis of shunt for first peak in left atrium (LA). PV = pulmonary
vein.
