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Concentrations of norepinephrine in the plasma during supine rest and after 5 min of standing in patients with pure autonomic failure (PAF), PD with or without orthostatic hypotension (OH), and multiple system atrophy (MSA) with OH. Note blunted orthostatic increment in plasma noradrenaline concentration in PAF, PD-OH, and MSA-OH but not in PD without OH.
