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Cardiac PET scans in patients with PD without orthostatic hypotension. Top: nitrogen-13-labelled ammonia perfusion scans. Bottom: 18F-dopa sympathoneural scans. Of 27 patients very few had entirely normal 18F-dopa radioactivity (A,E). Localised decreases were common (B,F and C,G), and about half had decreased 18F-dopa radioactivity throughout the left ventricular myocardium (D,H).
