we observed changes in postganglionic efferent discharges of muscle sympathetic nerve ( muscle sympathetic activity , msa ) microneurographically before and after the oral administration of l-threo-3,4-dihydroxyphenylserine ( l-threo-dops ) , a precursor of norepinephrine , in a patient with shy-drager syndrome and irregular fluctuations of blood pressure .
C0000378
l
C0028351
norepinephrine